360 lines
10 KiB
TypeScript
360 lines
10 KiB
TypeScript
import { convertHex } from '../common/convert';
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import { clamp, debounce } from '../common/helper';
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import { Placement } from '../common/types/canvas';
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import { IcyNetUser } from '../server/types/user';
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import { Picker } from './picker';
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import { $ } from './utils/dom';
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export class ViewCanvas {
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public picker = new Picker();
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private _user?: IcyNetUser;
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private _fn?: (placement: Placement) => void;
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private _canvas = $('<canvas class="canvas">') as HTMLCanvasElement;
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private _ctx = this._canvas.getContext('2d');
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private _wrapper = $('<div class="canvas__wrapper">');
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private _container = $('<div class="canvas__container">');
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private _cursor = $('<div class="canvas__cursor">');
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private _coods = $('<div class="canvas__coordinates">');
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private _size = 1000;
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private _viewWidth = 0;
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private _viewHeight = 0;
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private _posx = 0;
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private _posy = 0;
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private _zoom = 1;
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private _mousex = 0;
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private _mousey = 0;
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private _relmousex = 0;
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private _relmousey = 0;
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private _cursorx = 0;
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private _cursory = 0;
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private _relcursorx = 0;
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private _relcursory = 0;
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private _screencursorx = 0;
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private _screencursory = 0;
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private _dragging = false;
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private _pinching = false;
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private _previousPinchLength = 0;
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constructor() {}
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public moveCanvas(): void {
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this._canvas.style.transform = `scale(${this._zoom})`;
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this._container.style.transform = `translate(${this._posx}px, ${this._posy}px)`;
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}
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public center(): void {
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const offsetWidth = this._viewWidth - this._size;
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const offsetHeight = this._viewHeight - this._size;
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this._posx = offsetWidth / 2;
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this._posy = offsetHeight / 2;
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this.moveCanvas();
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this.moveCursor();
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}
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public moveCursor(): void {
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// Zoom multiplier
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// Apparent size of the canvas after scaling it
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const realSize = this._zoom * this._size;
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// The difference between the real canvas size and apparent size
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const screenX = this._posx;
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const screenY = this._posy;
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// Position of the on-screen cursor, snapped
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// Relative to top left of screen
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this._cursorx = Math.floor(
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clamp(this._viewWidth / 2, screenX, screenX + realSize),
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);
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this._cursory = Math.floor(
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clamp(this._viewHeight / 2, screenY, screenY + realSize),
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);
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// Position of the cursor on the canvas
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this._relcursorx = Math.floor((this._cursorx - screenX) / this._zoom);
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this._relcursory = Math.floor((this._cursory - screenY) / this._zoom);
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this._screencursorx = this._relcursorx * this._zoom + screenX;
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this._screencursory = this._relcursory * this._zoom + screenY;
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this._cursor.style.top = `${this._screencursory + this._zoom / 2}px`;
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this._cursor.style.left = `${this._screencursorx + this._zoom / 2}px`;
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this._cursor.style.transform = `scale(${this._zoom})`;
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this._coods.innerText = `(${this._relcursorx}, ${
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this._relcursory
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}) ${this._zoom.toFixed(2)}x`;
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this._updateURL();
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}
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public initialize(): void {
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this.picker.initialize();
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this._wrapper.append(this._coods);
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this._container.append(this._canvas);
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this._wrapper.append(this._cursor);
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this._wrapper.append(this._container);
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this._wrapper.append(this.picker.element);
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document.body.append(this._wrapper);
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const dragEvent = (x: number, y: number) => {
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const currentX = this._mousex;
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const currentY = this._mousey;
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this._mousex = x;
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this._mousey = y;
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const offsetX = currentX - this._mousex;
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const offsetY = currentY - this._mousey;
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if (this._dragging) {
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const realSize = this._zoom * this._size;
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this._posx = clamp(
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this._posx - offsetX,
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this._cursorx - realSize,
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this._cursorx,
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);
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this._posy = clamp(
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this._posy - offsetY,
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this._cursory - realSize,
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this._cursory,
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);
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this.moveCanvas();
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this.moveCursor();
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}
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};
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this._wrapper.addEventListener('mousemove', (ev: MouseEvent) =>
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dragEvent(ev.clientX, ev.clientY),
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);
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this._wrapper.addEventListener('mousedown', (ev: MouseEvent) => {
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this._mousex = ev.clientX;
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this._mousey = ev.clientY;
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this._dragging = true;
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});
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this._wrapper.addEventListener('mouseup', (ev: MouseEvent) => {
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this._dragging = false;
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});
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this._wrapper.addEventListener('touchstart', (ev: TouchEvent) => {
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const touch = ev.touches[0] || ev.changedTouches[0];
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this._mousex = touch.pageX;
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this._mousey = touch.pageY;
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this._dragging = true;
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if (ev.touches.length === 2) {
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this._pinching = true;
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}
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});
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this._wrapper.addEventListener('touchmove', (ev: TouchEvent) => {
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ev.preventDefault();
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if (ev.touches.length === 2 && this._pinching) {
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const pinchScale = Math.hypot(
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ev.touches[0].pageX - ev.touches[1].pageX,
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ev.touches[0].pageY - ev.touches[1].pageY,
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);
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if (this._previousPinchLength) {
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const delta = pinchScale / this._previousPinchLength;
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const scaleX = (ev.touches[0].clientX - this._posx) / this._zoom;
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const scaleY = (ev.touches[0].clientY - this._posy) / this._zoom;
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delta > 0 ? (this._zoom *= delta) : (this._zoom /= delta);
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this._zoom = clamp(this._zoom, 1, 100);
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this._posx = ev.touches[0].clientX - scaleX * this._zoom;
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this._posy = ev.touches[0].clientY - scaleY * this._zoom;
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}
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this._previousPinchLength = pinchScale;
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}
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dragEvent(ev.touches[0].clientX, ev.touches[0].clientY);
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});
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this._wrapper.addEventListener('touchend', (ev: TouchEvent) => {
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this._dragging = false;
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this._pinching = false;
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this._previousPinchLength = 0;
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});
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this._wrapper.addEventListener('pointerleave', (ev: MouseEvent) => {
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this._dragging = false;
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});
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this._wrapper.addEventListener('wheel', (ev: WheelEvent) => {
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ev.preventDefault();
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this._mousex = ev.clientX;
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this._mousey = ev.clientY;
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const scaleX = (ev.clientX - this._posx) / this._zoom;
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const scaleY = (ev.clientY - this._posy) / this._zoom;
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ev.deltaY < 0 ? (this._zoom *= 1.2) : (this._zoom /= 1.2);
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this._zoom = clamp(this._zoom, 1, 100);
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this._posx = ev.clientX - scaleX * this._zoom;
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this._posy = ev.clientY - scaleY * this._zoom;
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const realSize = this._zoom * this._size;
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this._posx = clamp(this._posx, this._cursorx - realSize, this._cursorx);
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this._posy = clamp(this._posy, this._cursory - realSize, this._cursory);
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this.moveCursor();
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this.moveCanvas();
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});
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this.picker.registerOnPlace((color) => {
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if (this._fn) {
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this._fn({
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x: this._relcursorx,
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y: this._relcursory,
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c: color,
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t: Date.now(),
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});
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}
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});
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window.addEventListener('resize', () => this.setView());
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window.addEventListener('keyup', (ev: KeyboardEvent) => {
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const numeral = parseInt(ev.key, 10);
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if (ev.key && !Number.isNaN(numeral)) {
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this.picker.pickPalette(numeral === 0 ? 9 : numeral - 1);
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return;
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}
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if (
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!['ArrowLeft', 'ArrowRight', 'ArrowDown', 'ArrowUp', ' '].includes(
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ev.key,
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)
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) {
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return;
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}
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const pixelSize = this._size / this._zoom;
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if (ev.key === 'ArrowLeft') {
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this._posx += pixelSize;
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} else if (ev.key === 'ArrowRight') {
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this._posx -= pixelSize;
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}
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if (ev.key === 'ArrowUp') {
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this._posy += pixelSize;
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} else if (ev.key === 'ArrowDown') {
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this._posy -= pixelSize;
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}
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if (ev.key === ' ') {
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this.picker.place();
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return;
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}
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this.moveCanvas();
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this.moveCursor();
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});
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}
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public setView() {
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this._viewWidth = document.body.clientWidth;
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this._viewHeight = document.body.clientHeight;
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this._fromURL();
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}
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public fill(size: number, canvas: number[]) {
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this._size = size;
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this._canvas.width = this._size;
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this._canvas.height = this._size;
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const data = this._ctx!.getImageData(0, 0, this._size, this._size);
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for (let row = 0; row < this._size; row++) {
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for (let col = 0; col < this._size; col++) {
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const index = col + row * this._size;
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const pixel = canvas[index];
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const { r, g, b } = convertHex(pixel);
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data.data[4 * index] = r;
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data.data[4 * index + 1] = g;
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data.data[4 * index + 2] = b;
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data.data[4 * index + 3] = 255;
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}
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}
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this._ctx!.putImageData(data, 0, 0);
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this.setView();
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}
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public setPixel(x: number, y: number, pixel: number) {
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const { r, g, b } = convertHex(pixel);
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this._ctx!.fillStyle = `rgb(${r},${g},${b})`;
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this._ctx!.fillRect(x, y, 1, 1);
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}
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public registerOnPlace(fn: (placement: Placement) => void): void {
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this._fn = fn;
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}
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public setUser(user: IcyNetUser): void {
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this._user = user;
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this.picker.setLoggedIn(user);
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}
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private _updateURL = debounce(() => {
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const urlelements = new URLSearchParams({
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px: this._relcursorx.toString(),
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py: this._relcursory.toString(),
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z: this._zoom.toFixed(2),
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});
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window.history.replaceState(
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null,
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document.title,
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`/?${urlelements.toString()}`,
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);
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}, 500);
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private _fromURL(): void {
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const search = window.location.search.substring(1);
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if (!search?.length) {
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this.center();
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return;
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}
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const obj = new URLSearchParams(search);
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const move = !!obj.get('px') || !!obj.get('py');
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if (!move) {
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return this.center();
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}
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if (obj.get('z')) {
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this._zoom = clamp(parseFloat(obj.get('z')), 1, 100);
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}
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if (obj.get('px')) {
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this._relcursorx = clamp(parseInt(obj.get('px'), 10), 0, this._size);
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}
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if (obj.get('py')) {
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this._relcursory = clamp(parseInt(obj.get('py'), 10), 0, this._size);
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}
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this._cursorx = this._viewWidth / 2;
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this._cursory = this._viewHeight / 2;
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this._posx = -Math.ceil(this._relcursorx * this._zoom - this._cursorx) - 1;
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this._posy = -Math.ceil(this._relcursory * this._zoom - this._cursory);
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this.moveCanvas();
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this.moveCursor();
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}
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}
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