1301 lines
48 KiB
JavaScript
1301 lines
48 KiB
JavaScript
/*!!
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* SVGCanvas v2.0.3
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* Draw on SVG using Canvas's 2D Context API.
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/mit-license.php
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*
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* Author:
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* Kerry Liu
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* Zeno Zeng
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*
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* Copyright (c) 2014 Gliffy Inc.
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* Copyright (c) 2021 Zeno Zeng
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*/
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import * as utils from './utils';
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import imageUtils from './image';
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export default (function () {
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"use strict";
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var STYLES, Context, CanvasGradient, CanvasPattern, namedEntities;
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//helper function to format a string
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function format(str, args) {
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var keys = Object.keys(args), i;
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for (i=0; i<keys.length; i++) {
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str = str.replace(new RegExp("\\{" + keys[i] + "\\}", "gi"), args[keys[i]]);
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}
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return str;
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}
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//helper function that generates a random string
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function randomString(holder) {
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var chars, randomstring, i;
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if (!holder) {
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throw new Error("cannot create a random attribute name for an undefined object");
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}
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chars = "ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
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randomstring = "";
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do {
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randomstring = "";
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for (i = 0; i < 12; i++) {
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randomstring += chars[Math.floor(Math.random() * chars.length)];
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}
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} while (holder[randomstring]);
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return randomstring;
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}
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//helper function to map named to numbered entities
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function createNamedToNumberedLookup(items, radix) {
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var i, entity, lookup = {}, base10, base16;
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items = items.split(',');
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radix = radix || 10;
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// Map from named to numbered entities.
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for (i = 0; i < items.length; i += 2) {
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entity = '&' + items[i + 1] + ';';
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base10 = parseInt(items[i], radix);
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lookup[entity] = '&#'+base10+';';
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}
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//FF and IE need to create a regex from hex values ie == \xa0
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lookup["\\xa0"] = ' ';
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return lookup;
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}
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//helper function to map canvas-textAlign to svg-textAnchor
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function getTextAnchor(textAlign) {
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//TODO: support rtl languages
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var mapping = {"left":"start", "right":"end", "center":"middle", "start":"start", "end":"end"};
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return mapping[textAlign] || mapping.start;
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}
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//helper function to map canvas-textBaseline to svg-dominantBaseline
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function getDominantBaseline(textBaseline) {
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//INFO: not supported in all browsers
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var mapping = {"alphabetic": "alphabetic", "hanging": "hanging", "top":"text-before-edge", "bottom":"text-after-edge", "middle":"central"};
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return mapping[textBaseline] || mapping.alphabetic;
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}
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// Unpack entities lookup where the numbers are in radix 32 to reduce the size
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// entity mapping courtesy of tinymce
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namedEntities = createNamedToNumberedLookup(
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'50,nbsp,51,iexcl,52,cent,53,pound,54,curren,55,yen,56,brvbar,57,sect,58,uml,59,copy,' +
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'5a,ordf,5b,laquo,5c,not,5d,shy,5e,reg,5f,macr,5g,deg,5h,plusmn,5i,sup2,5j,sup3,5k,acute,' +
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'5l,micro,5m,para,5n,middot,5o,cedil,5p,sup1,5q,ordm,5r,raquo,5s,frac14,5t,frac12,5u,frac34,' +
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'5v,iquest,60,Agrave,61,Aacute,62,Acirc,63,Atilde,64,Auml,65,Aring,66,AElig,67,Ccedil,' +
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'68,Egrave,69,Eacute,6a,Ecirc,6b,Euml,6c,Igrave,6d,Iacute,6e,Icirc,6f,Iuml,6g,ETH,6h,Ntilde,' +
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'6i,Ograve,6j,Oacute,6k,Ocirc,6l,Otilde,6m,Ouml,6n,times,6o,Oslash,6p,Ugrave,6q,Uacute,' +
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'6r,Ucirc,6s,Uuml,6t,Yacute,6u,THORN,6v,szlig,70,agrave,71,aacute,72,acirc,73,atilde,74,auml,' +
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'75,aring,76,aelig,77,ccedil,78,egrave,79,eacute,7a,ecirc,7b,euml,7c,igrave,7d,iacute,7e,icirc,' +
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'7f,iuml,7g,eth,7h,ntilde,7i,ograve,7j,oacute,7k,ocirc,7l,otilde,7m,ouml,7n,divide,7o,oslash,' +
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'7p,ugrave,7q,uacute,7r,ucirc,7s,uuml,7t,yacute,7u,thorn,7v,yuml,ci,fnof,sh,Alpha,si,Beta,' +
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'sj,Gamma,sk,Delta,sl,Epsilon,sm,Zeta,sn,Eta,so,Theta,sp,Iota,sq,Kappa,sr,Lambda,ss,Mu,' +
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'st,Nu,su,Xi,sv,Omicron,t0,Pi,t1,Rho,t3,Sigma,t4,Tau,t5,Upsilon,t6,Phi,t7,Chi,t8,Psi,' +
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't9,Omega,th,alpha,ti,beta,tj,gamma,tk,delta,tl,epsilon,tm,zeta,tn,eta,to,theta,tp,iota,' +
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'tq,kappa,tr,lambda,ts,mu,tt,nu,tu,xi,tv,omicron,u0,pi,u1,rho,u2,sigmaf,u3,sigma,u4,tau,' +
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'u5,upsilon,u6,phi,u7,chi,u8,psi,u9,omega,uh,thetasym,ui,upsih,um,piv,812,bull,816,hellip,' +
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'81i,prime,81j,Prime,81u,oline,824,frasl,88o,weierp,88h,image,88s,real,892,trade,89l,alefsym,' +
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'8cg,larr,8ch,uarr,8ci,rarr,8cj,darr,8ck,harr,8dl,crarr,8eg,lArr,8eh,uArr,8ei,rArr,8ej,dArr,' +
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'8ek,hArr,8g0,forall,8g2,part,8g3,exist,8g5,empty,8g7,nabla,8g8,isin,8g9,notin,8gb,ni,8gf,prod,' +
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'8gh,sum,8gi,minus,8gn,lowast,8gq,radic,8gt,prop,8gu,infin,8h0,ang,8h7,and,8h8,or,8h9,cap,8ha,cup,' +
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'8hb,int,8hk,there4,8hs,sim,8i5,cong,8i8,asymp,8j0,ne,8j1,equiv,8j4,le,8j5,ge,8k2,sub,8k3,sup,8k4,' +
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'nsub,8k6,sube,8k7,supe,8kl,oplus,8kn,otimes,8l5,perp,8m5,sdot,8o8,lceil,8o9,rceil,8oa,lfloor,8ob,' +
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'rfloor,8p9,lang,8pa,rang,9ea,loz,9j0,spades,9j3,clubs,9j5,hearts,9j6,diams,ai,OElig,aj,oelig,b0,' +
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'Scaron,b1,scaron,bo,Yuml,m6,circ,ms,tilde,802,ensp,803,emsp,809,thinsp,80c,zwnj,80d,zwj,80e,lrm,' +
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'80f,rlm,80j,ndash,80k,mdash,80o,lsquo,80p,rsquo,80q,sbquo,80s,ldquo,80t,rdquo,80u,bdquo,810,dagger,' +
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'811,Dagger,81g,permil,81p,lsaquo,81q,rsaquo,85c,euro', 32);
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//Some basic mappings for attributes and default values.
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STYLES = {
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"strokeStyle":{
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svgAttr : "stroke", //corresponding svg attribute
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canvas : "#000000", //canvas default
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svg : "none", //svg default
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apply : "stroke" //apply on stroke() or fill()
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},
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"fillStyle":{
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svgAttr : "fill",
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canvas : "#000000",
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svg : null, //svg default is black, but we need to special case this to handle canvas stroke without fill
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apply : "fill"
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},
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"lineCap":{
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svgAttr : "stroke-linecap",
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canvas : "butt",
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svg : "butt",
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apply : "stroke"
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},
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"lineJoin":{
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svgAttr : "stroke-linejoin",
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canvas : "miter",
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svg : "miter",
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apply : "stroke"
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},
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"miterLimit":{
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svgAttr : "stroke-miterlimit",
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canvas : 10,
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svg : 4,
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apply : "stroke"
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},
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"lineWidth":{
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svgAttr : "stroke-width",
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canvas : 1,
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svg : 1,
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apply : "stroke"
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},
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"globalAlpha": {
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svgAttr : "opacity",
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canvas : 1,
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svg : 1,
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apply : "fill stroke"
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},
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"font":{
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//font converts to multiple svg attributes, there is custom logic for this
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canvas : "10px sans-serif"
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},
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"shadowColor":{
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canvas : "#000000"
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},
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"shadowOffsetX":{
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canvas : 0
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},
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"shadowOffsetY":{
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canvas : 0
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},
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"shadowBlur":{
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canvas : 0
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},
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"textAlign":{
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canvas : "start"
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},
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"textBaseline":{
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canvas : "alphabetic"
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},
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"lineDash" : {
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svgAttr : "stroke-dasharray",
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canvas : [],
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svg : null,
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apply : "stroke"
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}
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};
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/**
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*
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* @param gradientNode - reference to the gradient
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* @constructor
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*/
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CanvasGradient = function (gradientNode, ctx) {
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this.__root = gradientNode;
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this.__ctx = ctx;
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};
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/**
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* Adds a color stop to the gradient root
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*/
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CanvasGradient.prototype.addColorStop = function (offset, color) {
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var stop = this.__ctx.__createElement("stop"), regex, matches;
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stop.setAttribute("offset", offset);
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if (utils.toString(color).indexOf("rgba") !== -1) {
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//separate alpha value, since webkit can't handle it
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regex = /rgba\(\s*(\d*\.?\d+)\s*,\s*(\d*\.?\d+)\s*,\s*(\d*\.?\d+)\s*,\s*(\d?\.?\d*)\s*\)/gi;
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matches = regex.exec(color);
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stop.setAttribute("stop-color", format("rgb({r},{g},{b})", {r:matches[1], g:matches[2], b:matches[3]}));
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stop.setAttribute("stop-opacity", matches[4]);
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} else {
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stop.setAttribute("stop-color", utils.toString(color));
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}
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this.__root.appendChild(stop);
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};
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CanvasPattern = function (pattern, ctx) {
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this.__root = pattern;
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this.__ctx = ctx;
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};
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/**
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* The mock canvas context
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* @param o - options include:
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* ctx - existing Context2D to wrap around
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* width - width of your canvas (defaults to 500)
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* height - height of your canvas (defaults to 500)
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* enableMirroring - enables canvas mirroring (get image data) (defaults to false)
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* document - the document object (defaults to the current document)
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*/
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Context = function (o) {
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var defaultOptions = { width:500, height:500, enableMirroring : false}, options;
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// keep support for this way of calling Context: new Context(width, height)
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if (arguments.length > 1) {
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options = defaultOptions;
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options.width = arguments[0];
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options.height = arguments[1];
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} else if ( !o ) {
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options = defaultOptions;
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} else {
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options = o;
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}
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if (!(this instanceof Context)) {
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//did someone call this without new?
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return new Context(options);
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}
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//setup options
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this.width = options.width || defaultOptions.width;
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this.height = options.height || defaultOptions.height;
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this.enableMirroring = options.enableMirroring !== undefined ? options.enableMirroring : defaultOptions.enableMirroring;
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this.canvas = this; ///point back to this instance!
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this.__document = options.document || document;
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// allow passing in an existing context to wrap around
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// if a context is passed in, we know a canvas already exist
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if (options.ctx) {
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this.__ctx = options.ctx;
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} else {
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this.__canvas = this.__document.createElement("canvas");
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this.__ctx = this.__canvas.getContext("2d");
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}
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this.__setDefaultStyles();
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this.__styleStack = [this.__getStyleState()];
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this.__groupStack = [];
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//the root svg element
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this.__root = this.__document.createElementNS("http://www.w3.org/2000/svg", "svg");
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this.__root.setAttribute("version", 1.1);
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this.__root.setAttribute("xmlns", "http://www.w3.org/2000/svg");
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this.__root.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xlink", "http://www.w3.org/1999/xlink");
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this.__root.setAttribute("width", this.width);
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this.__root.setAttribute("height", this.height);
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//make sure we don't generate the same ids in defs
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this.__ids = {};
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//defs tag
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this.__defs = this.__document.createElementNS("http://www.w3.org/2000/svg", "defs");
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this.__root.appendChild(this.__defs);
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//also add a group child. the svg element can't use the transform attribute
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this.__currentElement = this.__document.createElementNS("http://www.w3.org/2000/svg", "g");
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this.__root.appendChild(this.__currentElement);
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// init transformation matrix
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this.resetTransform();
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this.__options = options;
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this.__id = Math.random().toString(16).substring(2, 8);
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this.__debug(`new`, o);
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};
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/**
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* Log
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*
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* @private
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*/
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Context.prototype.__debug = function(...data) {
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if (!this.__options.debug) {
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return
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}
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console.debug(`svgcanvas#${this.__id}:`, ...data)
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}
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/**
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* Creates the specified svg element
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* @private
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*/
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Context.prototype.__createElement = function (elementName, properties, resetFill) {
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if (typeof properties === "undefined") {
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properties = {};
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}
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var element = this.__document.createElementNS("http://www.w3.org/2000/svg", elementName),
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keys = Object.keys(properties), i, key;
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if (resetFill) {
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//if fill or stroke is not specified, the svg element should not display. By default SVG's fill is black.
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element.setAttribute("fill", "none");
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element.setAttribute("stroke", "none");
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}
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for (i=0; i<keys.length; i++) {
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key = keys[i];
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element.setAttribute(key, properties[key]);
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}
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return element;
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};
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/**
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* Applies default canvas styles to the context
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* @private
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*/
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Context.prototype.__setDefaultStyles = function () {
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//default 2d canvas context properties see:http://www.w3.org/TR/2dcontext/
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var keys = Object.keys(STYLES), i, key;
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for (i=0; i<keys.length; i++) {
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key = keys[i];
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this[key] = STYLES[key].canvas;
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}
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};
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/**
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* Applies styles on restore
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* @param styleState
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* @private
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*/
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Context.prototype.__applyStyleState = function (styleState) {
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var keys = Object.keys(styleState), i, key;
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for (i=0; i<keys.length; i++) {
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key = keys[i];
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this[key] = styleState[key];
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}
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};
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/**
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* Gets the current style state
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* @return {Object}
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* @private
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*/
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Context.prototype.__getStyleState = function () {
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var i, styleState = {}, keys = Object.keys(STYLES), key;
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for (i=0; i<keys.length; i++) {
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key = keys[i];
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styleState[key] = this[key];
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}
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return styleState;
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};
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/**
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* @see https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/transform
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*/
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Context.prototype.__applyTransformation = function (element, matrix) {
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const {a, b, c, d, e, f} = matrix || this.getTransform();
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element.setAttribute('transform', `matrix(${a} ${b} ${c} ${d} ${e} ${f})`)
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}
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/**
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* Apples the current styles to the current SVG element. On "ctx.fill" or "ctx.stroke"
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* @param type
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* @private
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*/
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Context.prototype.__applyStyleToCurrentElement = function (type) {
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var currentElement = this.__currentElement;
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var currentStyleGroup = this.__currentElementsToStyle;
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if (currentStyleGroup) {
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currentElement.setAttribute(type, "");
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currentElement = currentStyleGroup.element;
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currentStyleGroup.children.forEach(function (node) {
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node.setAttribute(type, "");
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})
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}
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var keys = Object.keys(STYLES), i, style, value, regex, matches, id, nodeIndex, node;
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for (i = 0; i < keys.length; i++) {
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style = STYLES[keys[i]];
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value = this[keys[i]];
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if (style.apply) {
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//is this a gradient or pattern?
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if (value instanceof CanvasPattern) {
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//pattern
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if (value.__ctx) {
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//copy over defs
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for(nodeIndex = 0; nodeIndex < value.__ctx.__defs.childNodes.length; nodeIndex++){
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node = value.__ctx.__defs.childNodes[nodeIndex];
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id = node.getAttribute("id");
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this.__ids[id] = id;
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this.__defs.appendChild(node);
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}
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}
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currentElement.setAttribute(style.apply, format("url(#{id})", {id:value.__root.getAttribute("id")}));
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}
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else if (value instanceof CanvasGradient) {
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//gradient
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currentElement.setAttribute(style.apply, format("url(#{id})", {id:value.__root.getAttribute("id")}));
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} else if (style.apply.indexOf(type)!==-1 && style.svg !== value) {
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if ((style.svgAttr === "stroke" || style.svgAttr === "fill") && value.indexOf("rgba") !== -1) {
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//separate alpha value, since illustrator can't handle it
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regex = /rgba\(\s*(\d*\.?\d+)\s*,\s*(\d*\.?\d+)\s*,\s*(\d*\.?\d+)\s*,\s*(\d?\.?\d*)\s*\)/gi;
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matches = regex.exec(value);
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currentElement.setAttribute(style.svgAttr, format("rgb({r},{g},{b})", {r:matches[1], g:matches[2], b:matches[3]}));
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//should take globalAlpha here
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var opacity = matches[4];
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var globalAlpha = this.globalAlpha;
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if (globalAlpha != null) {
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opacity *= globalAlpha;
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}
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currentElement.setAttribute(style.svgAttr+"-opacity", opacity);
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} else {
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var attr = style.svgAttr;
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if (keys[i] === 'globalAlpha') {
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attr = type+'-'+style.svgAttr;
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if (currentElement.getAttribute(attr)) {
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//fill-opacity or stroke-opacity has already been set by stroke or fill.
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continue;
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}
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}
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//otherwise only update attribute if right type, and not svg default
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currentElement.setAttribute(attr, value);
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}
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}
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Will return the closest group or svg node. May return the current element.
|
|
* @private
|
|
*/
|
|
Context.prototype.__closestGroupOrSvg = function (node) {
|
|
node = node || this.__currentElement;
|
|
if (node.nodeName === "g" || node.nodeName === "svg") {
|
|
return node;
|
|
} else {
|
|
return this.__closestGroupOrSvg(node.parentNode);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Returns the serialized value of the svg so far
|
|
* @param fixNamedEntities - Standalone SVG doesn't support named entities, which document.createTextNode encodes.
|
|
* If true, we attempt to find all named entities and encode it as a numeric entity.
|
|
* @return serialized svg
|
|
*/
|
|
Context.prototype.getSerializedSvg = function (fixNamedEntities) {
|
|
var serialized = new XMLSerializer().serializeToString(this.__root),
|
|
keys, i, key, value, regexp, xmlns;
|
|
|
|
//IE search for a duplicate xmnls because they didn't implement setAttributeNS correctly
|
|
xmlns = /xmlns="http:\/\/www\.w3\.org\/2000\/svg".+xmlns="http:\/\/www\.w3\.org\/2000\/svg/gi;
|
|
if (xmlns.test(serialized)) {
|
|
serialized = serialized.replace('xmlns="http://www.w3.org/2000/svg','xmlns:xlink="http://www.w3.org/1999/xlink');
|
|
}
|
|
|
|
if (fixNamedEntities) {
|
|
keys = Object.keys(namedEntities);
|
|
//loop over each named entity and replace with the proper equivalent.
|
|
for (i=0; i<keys.length; i++) {
|
|
key = keys[i];
|
|
value = namedEntities[key];
|
|
regexp = new RegExp(key, "gi");
|
|
if (regexp.test(serialized)) {
|
|
serialized = serialized.replace(regexp, value);
|
|
}
|
|
}
|
|
}
|
|
|
|
return serialized;
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns the root svg
|
|
* @return
|
|
*/
|
|
Context.prototype.getSvg = function () {
|
|
return this.__root;
|
|
};
|
|
|
|
/**
|
|
* Will generate a group tag.
|
|
*/
|
|
Context.prototype.save = function () {
|
|
var group = this.__createElement("g");
|
|
var parent = this.__closestGroupOrSvg();
|
|
this.__groupStack.push(parent);
|
|
parent.appendChild(group);
|
|
this.__currentElement = group;
|
|
const style = this.__getStyleState();
|
|
|
|
this.__debug('save style', style)
|
|
this.__styleStack.push(style);
|
|
if (!this.__transformMatrixStack) {
|
|
this.__transformMatrixStack = [];
|
|
}
|
|
this.__transformMatrixStack.push(this.getTransform());
|
|
};
|
|
|
|
/**
|
|
* Sets current element to parent, or just root if already root
|
|
*/
|
|
Context.prototype.restore = function () {
|
|
this.__currentElement = this.__groupStack.pop();
|
|
this.__currentElementsToStyle = null;
|
|
//Clearing canvas will make the poped group invalid, currentElement is set to the root group node.
|
|
if (!this.__currentElement) {
|
|
this.__currentElement = this.__root.childNodes[1];
|
|
}
|
|
var state = this.__styleStack.pop();
|
|
this.__debug('restore style', state);
|
|
this.__applyStyleState(state);
|
|
if (this.__transformMatrixStack && this.__transformMatrixStack.length > 0) {
|
|
this.setTransform(this.__transformMatrixStack.pop())
|
|
}
|
|
|
|
};
|
|
|
|
/**
|
|
* Create a new Path Element
|
|
*/
|
|
Context.prototype.beginPath = function () {
|
|
var path, parent;
|
|
|
|
// Note that there is only one current default path, it is not part of the drawing state.
|
|
// See also: https://html.spec.whatwg.org/multipage/scripting.html#current-default-path
|
|
this.__currentDefaultPath = "";
|
|
this.__currentPosition = {};
|
|
|
|
path = this.__createElement("path", {}, true);
|
|
parent = this.__closestGroupOrSvg();
|
|
parent.appendChild(path);
|
|
this.__currentElement = path;
|
|
};
|
|
|
|
/**
|
|
* Helper function to apply currentDefaultPath to current path element
|
|
* @private
|
|
*/
|
|
Context.prototype.__applyCurrentDefaultPath = function () {
|
|
var currentElement = this.__currentElement;
|
|
if (currentElement.nodeName === "path") {
|
|
currentElement.setAttribute("d", this.__currentDefaultPath);
|
|
} else {
|
|
console.error("Attempted to apply path command to node", currentElement.nodeName);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Helper function to add path command
|
|
* @private
|
|
*/
|
|
Context.prototype.__addPathCommand = function (command) {
|
|
this.__currentDefaultPath += " ";
|
|
this.__currentDefaultPath += command;
|
|
};
|
|
|
|
/**
|
|
* Adds the move command to the current path element,
|
|
* if the currentPathElement is not empty create a new path element
|
|
*/
|
|
Context.prototype.moveTo = function (x,y) {
|
|
if (this.__currentElement.nodeName !== "path") {
|
|
this.beginPath();
|
|
}
|
|
|
|
// creates a new subpath with the given point
|
|
this.__currentPosition = {x: x, y: y};
|
|
this.__addPathCommand(format("M {x} {y}", {
|
|
x: this.__matrixTransform(x, y).x,
|
|
y: this.__matrixTransform(x, y).y
|
|
}));
|
|
};
|
|
|
|
/**
|
|
* Closes the current path
|
|
*/
|
|
Context.prototype.closePath = function () {
|
|
if (this.__currentDefaultPath) {
|
|
this.__addPathCommand("Z");
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Adds a line to command
|
|
*/
|
|
Context.prototype.lineTo = function (x, y) {
|
|
this.__currentPosition = {x: x, y: y};
|
|
if (this.__currentDefaultPath.indexOf('M') > -1) {
|
|
this.__addPathCommand(format("L {x} {y}", {
|
|
x: this.__matrixTransform(x, y).x,
|
|
y: this.__matrixTransform(x, y).y
|
|
}));
|
|
} else {
|
|
this.__addPathCommand(format("M {x} {y}", {
|
|
x: this.__matrixTransform(x, y).x,
|
|
y: this.__matrixTransform(x, y).y
|
|
}));
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Add a bezier command
|
|
*/
|
|
Context.prototype.bezierCurveTo = function (cp1x, cp1y, cp2x, cp2y, x, y) {
|
|
this.__currentPosition = {x: x, y: y};
|
|
this.__addPathCommand(format("C {cp1x} {cp1y} {cp2x} {cp2y} {x} {y}",
|
|
{
|
|
cp1x: this.__matrixTransform(cp1x, cp1y).x,
|
|
cp1y: this.__matrixTransform(cp1x, cp1y).y,
|
|
cp2x: this.__matrixTransform(cp2x, cp2y).x,
|
|
cp2y: this.__matrixTransform(cp2x, cp2y).y,
|
|
x: this.__matrixTransform(x, y).x,
|
|
y: this.__matrixTransform(x, y).y
|
|
}));
|
|
};
|
|
|
|
/**
|
|
* Adds a quadratic curve to command
|
|
*/
|
|
Context.prototype.quadraticCurveTo = function (cpx, cpy, x, y) {
|
|
this.__currentPosition = {x: x, y: y};
|
|
this.__addPathCommand(format("Q {cpx} {cpy} {x} {y}", {
|
|
cpx: this.__matrixTransform(cpx, cpy).x,
|
|
cpy: this.__matrixTransform(cpx, cpy).y,
|
|
x: this.__matrixTransform(x, y).x,
|
|
y: this.__matrixTransform(x, y).y
|
|
}));
|
|
};
|
|
|
|
|
|
/**
|
|
* Return a new normalized vector of given vector
|
|
*/
|
|
var normalize = function (vector) {
|
|
var len = Math.sqrt(vector[0] * vector[0] + vector[1] * vector[1]);
|
|
return [vector[0] / len, vector[1] / len];
|
|
};
|
|
|
|
/**
|
|
* Adds the arcTo to the current path
|
|
*
|
|
* @see http://www.w3.org/TR/2015/WD-2dcontext-20150514/#dom-context-2d-arcto
|
|
*/
|
|
Context.prototype.arcTo = function (x1, y1, x2, y2, radius) {
|
|
// Let the point (x0, y0) be the last point in the subpath.
|
|
var x0 = this.__currentPosition && this.__currentPosition.x;
|
|
var y0 = this.__currentPosition && this.__currentPosition.y;
|
|
|
|
// First ensure there is a subpath for (x1, y1).
|
|
if (typeof x0 == "undefined" || typeof y0 == "undefined") {
|
|
return;
|
|
}
|
|
|
|
// Negative values for radius must cause the implementation to throw an IndexSizeError exception.
|
|
if (radius < 0) {
|
|
throw new Error("IndexSizeError: The radius provided (" + radius + ") is negative.");
|
|
}
|
|
|
|
// If the point (x0, y0) is equal to the point (x1, y1),
|
|
// or if the point (x1, y1) is equal to the point (x2, y2),
|
|
// or if the radius radius is zero,
|
|
// then the method must add the point (x1, y1) to the subpath,
|
|
// and connect that point to the previous point (x0, y0) by a straight line.
|
|
if (((x0 === x1) && (y0 === y1))
|
|
|| ((x1 === x2) && (y1 === y2))
|
|
|| (radius === 0)) {
|
|
this.lineTo(x1, y1);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, if the points (x0, y0), (x1, y1), and (x2, y2) all lie on a single straight line,
|
|
// then the method must add the point (x1, y1) to the subpath,
|
|
// and connect that point to the previous point (x0, y0) by a straight line.
|
|
var unit_vec_p1_p0 = normalize([x0 - x1, y0 - y1]);
|
|
var unit_vec_p1_p2 = normalize([x2 - x1, y2 - y1]);
|
|
if (unit_vec_p1_p0[0] * unit_vec_p1_p2[1] === unit_vec_p1_p0[1] * unit_vec_p1_p2[0]) {
|
|
this.lineTo(x1, y1);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, let The Arc be the shortest arc given by circumference of the circle that has radius radius,
|
|
// and that has one point tangent to the half-infinite line that crosses the point (x0, y0) and ends at the point (x1, y1),
|
|
// and that has a different point tangent to the half-infinite line that ends at the point (x1, y1), and crosses the point (x2, y2).
|
|
// The points at which this circle touches these two lines are called the start and end tangent points respectively.
|
|
|
|
// note that both vectors are unit vectors, so the length is 1
|
|
var cos = (unit_vec_p1_p0[0] * unit_vec_p1_p2[0] + unit_vec_p1_p0[1] * unit_vec_p1_p2[1]);
|
|
var theta = Math.acos(Math.abs(cos));
|
|
|
|
// Calculate origin
|
|
var unit_vec_p1_origin = normalize([
|
|
unit_vec_p1_p0[0] + unit_vec_p1_p2[0],
|
|
unit_vec_p1_p0[1] + unit_vec_p1_p2[1]
|
|
]);
|
|
var len_p1_origin = radius / Math.sin(theta / 2);
|
|
var x = x1 + len_p1_origin * unit_vec_p1_origin[0];
|
|
var y = y1 + len_p1_origin * unit_vec_p1_origin[1];
|
|
|
|
// Calculate start angle and end angle
|
|
// rotate 90deg clockwise (note that y axis points to its down)
|
|
var unit_vec_origin_start_tangent = [
|
|
-unit_vec_p1_p0[1],
|
|
unit_vec_p1_p0[0]
|
|
];
|
|
// rotate 90deg counter clockwise (note that y axis points to its down)
|
|
var unit_vec_origin_end_tangent = [
|
|
unit_vec_p1_p2[1],
|
|
-unit_vec_p1_p2[0]
|
|
];
|
|
var getAngle = function (vector) {
|
|
// get angle (clockwise) between vector and (1, 0)
|
|
var x = vector[0];
|
|
var y = vector[1];
|
|
if (y >= 0) { // note that y axis points to its down
|
|
return Math.acos(x);
|
|
} else {
|
|
return -Math.acos(x);
|
|
}
|
|
};
|
|
var startAngle = getAngle(unit_vec_origin_start_tangent);
|
|
var endAngle = getAngle(unit_vec_origin_end_tangent);
|
|
|
|
// Connect the point (x0, y0) to the start tangent point by a straight line
|
|
this.lineTo(x + unit_vec_origin_start_tangent[0] * radius,
|
|
y + unit_vec_origin_start_tangent[1] * radius);
|
|
|
|
// Connect the start tangent point to the end tangent point by arc
|
|
// and adding the end tangent point to the subpath.
|
|
this.arc(x, y, radius, startAngle, endAngle);
|
|
};
|
|
|
|
/**
|
|
* Sets the stroke property on the current element
|
|
*/
|
|
Context.prototype.stroke = function () {
|
|
if (this.__currentElement.nodeName === "path") {
|
|
this.__currentElement.setAttribute("paint-order", "fill stroke markers");
|
|
}
|
|
this.__applyCurrentDefaultPath();
|
|
this.__applyStyleToCurrentElement("stroke");
|
|
};
|
|
|
|
/**
|
|
* Sets fill properties on the current element
|
|
*/
|
|
Context.prototype.fill = function () {
|
|
if (this.__currentElement.nodeName === "path") {
|
|
this.__currentElement.setAttribute("paint-order", "stroke fill markers");
|
|
}
|
|
this.__applyCurrentDefaultPath();
|
|
this.__applyStyleToCurrentElement("fill");
|
|
};
|
|
|
|
/**
|
|
* Adds a rectangle to the path.
|
|
*/
|
|
Context.prototype.rect = function (x, y, width, height) {
|
|
if (this.__currentElement.nodeName !== "path") {
|
|
this.beginPath();
|
|
}
|
|
this.moveTo(x, y);
|
|
this.lineTo(x+width, y);
|
|
this.lineTo(x+width, y+height);
|
|
this.lineTo(x, y+height);
|
|
this.lineTo(x, y);
|
|
this.closePath();
|
|
};
|
|
|
|
|
|
/**
|
|
* adds a rectangle element
|
|
*/
|
|
Context.prototype.fillRect = function (x, y, width, height) {
|
|
let {a, b, c, d, e, f} = this.getTransform();
|
|
if (JSON.stringify([a, b, c, d, e, f]) === JSON.stringify([1, 0, 0, 1, 0, 0])) {
|
|
//clear entire canvas
|
|
if (x === 0 && y === 0 && width === this.width && height === this.height) {
|
|
this.__clearCanvas();
|
|
}
|
|
}
|
|
var rect, parent;
|
|
rect = this.__createElement("rect", {
|
|
x : x,
|
|
y : y,
|
|
width : width,
|
|
height : height
|
|
}, true);
|
|
parent = this.__closestGroupOrSvg();
|
|
parent.appendChild(rect);
|
|
this.__currentElement = rect;
|
|
this.__applyTransformation(rect);
|
|
this.__applyStyleToCurrentElement("fill");
|
|
};
|
|
|
|
/**
|
|
* Draws a rectangle with no fill
|
|
* @param x
|
|
* @param y
|
|
* @param width
|
|
* @param height
|
|
*/
|
|
Context.prototype.strokeRect = function (x, y, width, height) {
|
|
var rect, parent;
|
|
rect = this.__createElement("rect", {
|
|
x : x,
|
|
y : y,
|
|
width : width,
|
|
height : height
|
|
}, true);
|
|
parent = this.__closestGroupOrSvg();
|
|
parent.appendChild(rect);
|
|
this.__currentElement = rect;
|
|
this.__applyTransformation(rect);
|
|
this.__applyStyleToCurrentElement("stroke");
|
|
};
|
|
|
|
|
|
/**
|
|
* Clear entire canvas:
|
|
* 1. save current transforms
|
|
* 2. remove all the childNodes of the root g element
|
|
*/
|
|
Context.prototype.__clearCanvas = function () {
|
|
var rootGroup = this.__root.childNodes[1];
|
|
this.__root.removeChild(rootGroup);
|
|
this.__currentElement = this.__document.createElementNS("http://www.w3.org/2000/svg", "g");
|
|
this.__root.appendChild(this.__currentElement);
|
|
//reset __groupStack as all the child group nodes are all removed.
|
|
this.__groupStack = [];
|
|
};
|
|
|
|
/**
|
|
* "Clears" a canvas by just drawing a white rectangle in the current group.
|
|
*/
|
|
Context.prototype.clearRect = function (x, y, width, height) {
|
|
let {a, b, c, d, e, f} = this.getTransform();
|
|
if (JSON.stringify([a, b, c, d, e, f]) === JSON.stringify([1, 0, 0, 1, 0, 0])) {
|
|
//clear entire canvas
|
|
if (x === 0 && y === 0 && width === this.width && height === this.height) {
|
|
this.__clearCanvas();
|
|
return;
|
|
}
|
|
}
|
|
var rect, parent = this.__closestGroupOrSvg();
|
|
rect = this.__createElement("rect", {
|
|
x : x,
|
|
y : y,
|
|
width : width,
|
|
height : height,
|
|
fill : "#FFFFFF"
|
|
}, true);
|
|
this.__applyTransformation(rect)
|
|
parent.appendChild(rect);
|
|
};
|
|
|
|
/**
|
|
* Adds a linear gradient to a defs tag.
|
|
* Returns a canvas gradient object that has a reference to it's parent def
|
|
*/
|
|
Context.prototype.createLinearGradient = function (x1, y1, x2, y2) {
|
|
var grad = this.__createElement("linearGradient", {
|
|
id : randomString(this.__ids),
|
|
x1 : x1+"px",
|
|
x2 : x2+"px",
|
|
y1 : y1+"px",
|
|
y2 : y2+"px",
|
|
"gradientUnits" : "userSpaceOnUse"
|
|
}, false);
|
|
this.__defs.appendChild(grad);
|
|
return new CanvasGradient(grad, this);
|
|
};
|
|
|
|
/**
|
|
* Adds a radial gradient to a defs tag.
|
|
* Returns a canvas gradient object that has a reference to it's parent def
|
|
*/
|
|
Context.prototype.createRadialGradient = function (x0, y0, r0, x1, y1, r1) {
|
|
var grad = this.__createElement("radialGradient", {
|
|
id : randomString(this.__ids),
|
|
cx : x1+"px",
|
|
cy : y1+"px",
|
|
r : r1+"px",
|
|
fx : x0+"px",
|
|
fy : y0+"px",
|
|
"gradientUnits" : "userSpaceOnUse"
|
|
}, false);
|
|
this.__defs.appendChild(grad);
|
|
return new CanvasGradient(grad, this);
|
|
|
|
};
|
|
|
|
/**
|
|
* Fills or strokes text
|
|
* @param text
|
|
* @param x
|
|
* @param y
|
|
* @param action - stroke or fill
|
|
* @private
|
|
*/
|
|
Context.prototype.__applyText = function (text, x, y, action) {
|
|
var el = document.createElement("span");
|
|
el.setAttribute("style", 'font:' + this.font);
|
|
|
|
var style = el.style, // CSSStyleDeclaration object
|
|
parent = this.__closestGroupOrSvg(),
|
|
textElement = this.__createElement("text", {
|
|
"font-family": style.fontFamily,
|
|
"font-size": style.fontSize,
|
|
"font-style": style.fontStyle,
|
|
"font-weight": style.fontWeight,
|
|
|
|
// canvas doesn't support underline natively, but we do :)
|
|
"text-decoration": this.__fontUnderline,
|
|
"x": x,
|
|
"y": y,
|
|
"text-anchor": getTextAnchor(this.textAlign),
|
|
"dominant-baseline": getDominantBaseline(this.textBaseline)
|
|
}, true);
|
|
|
|
textElement.appendChild(this.__document.createTextNode(text));
|
|
this.__currentElement = textElement;
|
|
this.__applyTransformation(textElement);
|
|
this.__applyStyleToCurrentElement(action);
|
|
|
|
if (this.__fontHref) {
|
|
var a = this.__createElement("a");
|
|
// canvas doesn't natively support linking, but we do :)
|
|
a.setAttributeNS("http://www.w3.org/1999/xlink", "xlink:href", this.__fontHref);
|
|
a.appendChild(textElement);
|
|
textElement = a;
|
|
}
|
|
|
|
parent.appendChild(textElement);
|
|
};
|
|
|
|
/**
|
|
* Creates a text element
|
|
* @param text
|
|
* @param x
|
|
* @param y
|
|
*/
|
|
Context.prototype.fillText = function (text, x, y) {
|
|
this.__applyText(text, x, y, "fill");
|
|
};
|
|
|
|
/**
|
|
* Strokes text
|
|
* @param text
|
|
* @param x
|
|
* @param y
|
|
*/
|
|
Context.prototype.strokeText = function (text, x, y) {
|
|
this.__applyText(text, x, y, "stroke");
|
|
};
|
|
|
|
/**
|
|
* No need to implement this for svg.
|
|
* @param text
|
|
* @return {TextMetrics}
|
|
*/
|
|
Context.prototype.measureText = function (text) {
|
|
this.__ctx.font = this.font;
|
|
return this.__ctx.measureText(text);
|
|
};
|
|
|
|
/**
|
|
* Arc command!
|
|
*/
|
|
Context.prototype.arc = function (x, y, radius, startAngle, endAngle, counterClockwise) {
|
|
// in canvas no circle is drawn if no angle is provided.
|
|
if (startAngle === endAngle) {
|
|
return;
|
|
}
|
|
startAngle = startAngle % (2*Math.PI);
|
|
endAngle = endAngle % (2*Math.PI);
|
|
if (startAngle === endAngle) {
|
|
//circle time! subtract some of the angle so svg is happy (svg elliptical arc can't draw a full circle)
|
|
endAngle = ((endAngle + (2*Math.PI)) - 0.001 * (counterClockwise ? -1 : 1)) % (2*Math.PI);
|
|
}
|
|
var endX = x+radius*Math.cos(endAngle),
|
|
endY = y+radius*Math.sin(endAngle),
|
|
startX = x+radius*Math.cos(startAngle),
|
|
startY = y+radius*Math.sin(startAngle),
|
|
sweepFlag = counterClockwise ? 0 : 1,
|
|
largeArcFlag = 0,
|
|
diff = endAngle - startAngle;
|
|
|
|
// https://github.com/gliffy/canvas2svg/issues/4
|
|
if (diff < 0) {
|
|
diff += 2*Math.PI;
|
|
}
|
|
|
|
if (counterClockwise) {
|
|
largeArcFlag = diff > Math.PI ? 0 : 1;
|
|
} else {
|
|
largeArcFlag = diff > Math.PI ? 1 : 0;
|
|
}
|
|
|
|
this.lineTo(startX, startY);
|
|
this.__addPathCommand(format("A {rx} {ry} {xAxisRotation} {largeArcFlag} {sweepFlag} {endX} {endY}",
|
|
{
|
|
rx:radius,
|
|
ry:radius,
|
|
xAxisRotation:0,
|
|
largeArcFlag:largeArcFlag,
|
|
sweepFlag:sweepFlag,
|
|
endX: this.__matrixTransform(endX, endY).x,
|
|
endY: this.__matrixTransform(endX, endY).y
|
|
}));
|
|
|
|
this.__currentPosition = {x: endX, y: endY};
|
|
};
|
|
|
|
/**
|
|
* Generates a ClipPath from the clip command.
|
|
*/
|
|
Context.prototype.clip = function () {
|
|
var group = this.__closestGroupOrSvg(),
|
|
clipPath = this.__createElement("clipPath"),
|
|
id = randomString(this.__ids),
|
|
newGroup = this.__createElement("g");
|
|
|
|
this.__applyCurrentDefaultPath();
|
|
group.removeChild(this.__currentElement);
|
|
clipPath.setAttribute("id", id);
|
|
clipPath.appendChild(this.__currentElement);
|
|
|
|
this.__defs.appendChild(clipPath);
|
|
|
|
//set the clip path to this group
|
|
group.setAttribute("clip-path", format("url(#{id})", {id:id}));
|
|
|
|
//clip paths can be scaled and transformed, we need to add another wrapper group to avoid later transformations
|
|
// to this path
|
|
group.appendChild(newGroup);
|
|
|
|
this.__currentElement = newGroup;
|
|
|
|
};
|
|
|
|
/**
|
|
* Draws a canvas, image or mock context to this canvas.
|
|
* Note that all svg dom manipulation uses node.childNodes rather than node.children for IE support.
|
|
* http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#dom-context-2d-drawimage
|
|
*/
|
|
Context.prototype.drawImage = function () {
|
|
//convert arguments to a real array
|
|
var args = Array.prototype.slice.call(arguments),
|
|
image=args[0],
|
|
dx, dy, dw, dh, sx=0, sy=0, sw, sh, parent, svg, defs, group,
|
|
currentElement, svgImage, canvas, context, id;
|
|
|
|
if (args.length === 3) {
|
|
dx = args[1];
|
|
dy = args[2];
|
|
sw = image.width;
|
|
sh = image.height;
|
|
dw = sw;
|
|
dh = sh;
|
|
} else if (args.length === 5) {
|
|
dx = args[1];
|
|
dy = args[2];
|
|
dw = args[3];
|
|
dh = args[4];
|
|
sw = image.width;
|
|
sh = image.height;
|
|
} else if (args.length === 9) {
|
|
sx = args[1];
|
|
sy = args[2];
|
|
sw = args[3];
|
|
sh = args[4];
|
|
dx = args[5];
|
|
dy = args[6];
|
|
dw = args[7];
|
|
dh = args[8];
|
|
} else {
|
|
throw new Error("Invalid number of arguments passed to drawImage: " + arguments.length);
|
|
}
|
|
|
|
parent = this.__closestGroupOrSvg();
|
|
currentElement = this.__currentElement;
|
|
const matrix = this.getTransform().translate(dx, dy);
|
|
if (image instanceof Context) {
|
|
//canvas2svg mock canvas context. In the future we may want to clone nodes instead.
|
|
//also I'm currently ignoring dw, dh, sw, sh, sx, sy for a mock context.
|
|
svg = image.getSvg().cloneNode(true);
|
|
if (svg.childNodes && svg.childNodes.length > 1) {
|
|
defs = svg.childNodes[0];
|
|
while(defs.childNodes.length) {
|
|
id = defs.childNodes[0].getAttribute("id");
|
|
this.__ids[id] = id;
|
|
this.__defs.appendChild(defs.childNodes[0]);
|
|
}
|
|
group = svg.childNodes[1];
|
|
if (group) {
|
|
this.__applyTransformation(group, matrix);
|
|
parent.appendChild(group);
|
|
}
|
|
}
|
|
} else if (image.nodeName === "CANVAS" || image.nodeName === "IMG") {
|
|
//canvas or image
|
|
svgImage = this.__createElement("image");
|
|
svgImage.setAttribute("width", dw);
|
|
svgImage.setAttribute("height", dh);
|
|
svgImage.setAttribute("preserveAspectRatio", "none");
|
|
|
|
if (sx || sy || sw !== image.width || sh !== image.height) {
|
|
//crop the image using a temporary canvas
|
|
canvas = this.__document.createElement("canvas");
|
|
canvas.width = dw;
|
|
canvas.height = dh;
|
|
context = canvas.getContext("2d");
|
|
context.drawImage(image, sx, sy, sw, sh, 0, 0, dw, dh);
|
|
image = canvas;
|
|
}
|
|
this.__applyTransformation(svgImage, matrix);
|
|
svgImage.setAttributeNS("http://www.w3.org/1999/xlink", "xlink:href",
|
|
image.nodeName === "CANVAS" ? image.toDataURL() : image.getAttribute("src"));
|
|
parent.appendChild(svgImage);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Generates a pattern tag
|
|
*/
|
|
Context.prototype.createPattern = function (image, repetition) {
|
|
var pattern = this.__document.createElementNS("http://www.w3.org/2000/svg", "pattern"), id = randomString(this.__ids),
|
|
img;
|
|
pattern.setAttribute("id", id);
|
|
pattern.setAttribute("width", image.width);
|
|
pattern.setAttribute("height", image.height);
|
|
// We want the pattern sizing to be absolute, and not relative
|
|
// https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Patterns
|
|
// https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/patternUnits
|
|
pattern.setAttribute("patternUnits", "userSpaceOnUse");
|
|
|
|
if (image.nodeName === "CANVAS" || image.nodeName === "IMG") {
|
|
img = this.__document.createElementNS("http://www.w3.org/2000/svg", "image");
|
|
img.setAttribute("width", image.width);
|
|
img.setAttribute("height", image.height);
|
|
img.setAttributeNS("http://www.w3.org/1999/xlink", "xlink:href",
|
|
image.nodeName === "CANVAS" ? image.toDataURL() : image.getAttribute("src"));
|
|
pattern.appendChild(img);
|
|
this.__defs.appendChild(pattern);
|
|
} else if (image instanceof Context) {
|
|
pattern.appendChild(image.__root.childNodes[1]);
|
|
this.__defs.appendChild(pattern);
|
|
}
|
|
return new CanvasPattern(pattern, this);
|
|
};
|
|
|
|
Context.prototype.setLineDash = function (dashArray) {
|
|
if (dashArray && dashArray.length > 0) {
|
|
this.lineDash = dashArray.join(",");
|
|
} else {
|
|
this.lineDash = null;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* SetTransform changes the current transformation matrix to
|
|
* the matrix given by the arguments as described below.
|
|
*
|
|
* @see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setTransform
|
|
*/
|
|
Context.prototype.setTransform = function (a, b, c, d, e, f) {
|
|
if (a instanceof DOMMatrix) {
|
|
this.__transformMatrix = new DOMMatrix([a.a, a.b, a.c, a.d, a.e, a.f]);
|
|
} else {
|
|
this.__transformMatrix = new DOMMatrix([a, b, c, d, e, f]);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* GetTransform Returns a copy of the current transformation matrix,
|
|
* as a newly created DOMMAtrix Object
|
|
*
|
|
* @returns A DOMMatrix Object
|
|
*/
|
|
Context.prototype.getTransform = function () {
|
|
let {a, b, c, d, e, f} = this.__transformMatrix;
|
|
return new DOMMatrix([a, b, c, d, e, f]);
|
|
};
|
|
|
|
/**
|
|
* ResetTransform resets the current transformation matrix to the identity matrix
|
|
*
|
|
* @see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/resetTransform
|
|
*/
|
|
Context.prototype.resetTransform = function () {
|
|
this.setTransform(1, 0, 0, 1, 0, 0);
|
|
};
|
|
|
|
/**
|
|
* Add the scaling transformation described by the arguments to the current transformation matrix.
|
|
*
|
|
* @param x The x argument represents the scale factor in the horizontal direction
|
|
* @param y The y argument represents the scale factor in the vertical direction.
|
|
* @see https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-scale
|
|
*/
|
|
Context.prototype.scale = function (x, y) {
|
|
if (y === undefined) {
|
|
y = x;
|
|
}
|
|
// If either of the arguments are infinite or NaN, then return.
|
|
if (isNaN(x) || isNaN(y) || !isFinite(x) || !isFinite(y)) {
|
|
return
|
|
}
|
|
let matrix = this.getTransform().scale(x, y);
|
|
this.setTransform(matrix);
|
|
};
|
|
|
|
/**
|
|
* Rotate adds a rotation to the transformation matrix.
|
|
*
|
|
* @param angle The rotation angle, clockwise in radians. You can use degree * Math.PI / 180 to calculate a radian from a degree.
|
|
* @see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/rotate
|
|
* @see https://www.w3.org/TR/css-transforms-1
|
|
*/
|
|
Context.prototype.rotate = function (angle) {
|
|
let matrix = this.getTransform().multiply(new DOMMatrix([
|
|
Math.cos(angle),
|
|
Math.sin(angle),
|
|
-Math.sin(angle),
|
|
Math.cos(angle),
|
|
0,
|
|
0
|
|
]))
|
|
this.setTransform(matrix);
|
|
};
|
|
|
|
/**
|
|
* Translate adds a translation transformation to the current matrix.
|
|
*
|
|
* @param x Distance to move in the horizontal direction. Positive values are to the right, and negative to the left.
|
|
* @param y Distance to move in the vertical direction. Positive values are down, and negative are up.
|
|
* @see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/translate
|
|
*/
|
|
Context.prototype.translate = function (x, y) {
|
|
const matrix = this.getTransform().translate(x, y);
|
|
this.setTransform(matrix);
|
|
};
|
|
|
|
/**
|
|
* Transform multiplies the current transformation with the matrix described by the arguments of this method.
|
|
* This lets you scale, rotate, translate (move), and skew the context.
|
|
*
|
|
* @see https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/transform
|
|
*/
|
|
Context.prototype.transform = function (a, b, c, d, e, f) {
|
|
const matrix = this.getTransform().multiply(new DOMMatrix([a, b, c, d, e, f]));
|
|
this.setTransform(matrix);
|
|
};
|
|
|
|
Context.prototype.__matrixTransform = function(x, y) {
|
|
return new DOMPoint(x, y).matrixTransform(this.__transformMatrix)
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @param {*} sx The x-axis coordinate of the top-left corner of the rectangle from which the ImageData will be extracted.
|
|
* @param {*} sy The y-axis coordinate of the top-left corner of the rectangle from which the ImageData will be extracted.
|
|
* @param {*} sw The width of the rectangle from which the ImageData will be extracted. Positive values are to the right, and negative to the left.
|
|
* @param {*} sh The height of the rectangle from which the ImageData will be extracted. Positive values are down, and negative are up.
|
|
* @param {Boolean} options.async Will return a Promise<ImageData> if true, must be set to true
|
|
* @returns An ImageData object containing the image data for the rectangle of the canvas specified. The coordinates of the rectangle's top-left corner are (sx, sy), while the coordinates of the bottom corner are (sx + sw, sy + sh).
|
|
*/
|
|
Context.prototype.getImageData = function(sx, sy, sw, sh, options) {
|
|
return imageUtils.getImageData(this.getSvg(), this.width, this.height, sx, sy, sw, sh, options);
|
|
};
|
|
|
|
/**
|
|
* Not yet implemented
|
|
*/
|
|
Context.prototype.drawFocusRing = function () {};
|
|
Context.prototype.createImageData = function () {};
|
|
Context.prototype.putImageData = function () {};
|
|
Context.prototype.globalCompositeOperation = function () {};
|
|
|
|
return Context;
|
|
}());
|