1273 lines
32 KiB
JavaScript
1273 lines
32 KiB
JavaScript
window.onload = function () {
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/*
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My programming practice notes:
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* every major feature as part of updating the game (such as towers, enemies)
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are handeled in a separate function
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* I use Object.assign to copy objects in order to eliminate references when spawning enemies
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and to get the ability to modify them individually
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* Components such as buttons or selections within the canvas are classes
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* if, function and else have spaces between both '(' and '{'
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`if (thing) {}` not `if(thing){}`
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* Keep all variables local to their scope (in other words, use `let` instead of `var`)
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*/
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let canvas = document.getElementById('canvas')
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let ctx = canvas.getContext('2d')
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let fps = 0
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let fpsDraw = 0
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let fpsCount = 0
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// mouse
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let mX = 0
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let mY = 0
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let mXr = 0
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let mYr = 0
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let Game = {
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state: 2,
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enemies: [],
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enemySpawnList: [],
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towers: [],
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particles: [],
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selltext: [],
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map: null,
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health: 100,
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money: 100,
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wave: 0,
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waveTimer: 0,
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tower: 'simple',
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towerSel: null,
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debug: false,
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sellRatio: .8
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}
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/**
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speed - movement speed multiplier - higher: faster
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node - always 1
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health - health of the enemy
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reward - money earned when killed
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frequency - milliseconds to spawn in
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icon - currently color of the enemy
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*/
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let Enemies = {
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basic: {
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speed: 10,
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node: 1,
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health: 50,
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reward: 10,
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frequency: 40,
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icon: '#f00'
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},
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speedy: {
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speed: 20,
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node: 1,
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health: 60,
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reward: 15,
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frequency: 35,
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icon: '#f11'
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},
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tough: {
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speed: 5,
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node: 1,
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health: 100,
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reward: 20,
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frequency: 40,
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icon: '#f40'
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}
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}
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let Towers = {
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simple: {
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range: 5, // range in tiles
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damage: 15, // damage to deal to enemies when hit
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rate: 20, // rate of fire, higher - slower
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name: 'Simple', // name of the tower
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description: 'Medium rate and damage',
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speed: 30, // bullet speed, higher - faster
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cost: 50, // cost to place
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icon: '#333', // currently color
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bullet: 1 // The type of bullet. 1: damage, 2: slow down by damage, 3: instant kill
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},
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rapid: {
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range: 3,
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damage: 5,
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rate: 5,
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name: 'Rapid',
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description: 'Rapid-firing but low damage',
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speed: 30,
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cost: 250,
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icon: '#303',
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bullet: 1
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},
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sticky: {
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range: 3,
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damage: 10,
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rate: 30,
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name: 'Sticky',
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description: 'Slow down enemies by damage',
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speed: 50,
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cost: 500,
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icon: '#e27c06',
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bullet: 2
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},
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snipe: {
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range: 10,
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damage: 1500,
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rate: 100,
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name: 'Sniper',
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description: 'Slow firing but always kills',
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speed: 50,
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cost: 1000,
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icon: '#4f3',
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bullet: 1
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}
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}
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/*
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Tiles:
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* 0 - grass
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* 1 - path
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* 2 - spawn
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* 3 - end
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Wave layout:
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[] - optional
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<> - value type
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{
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type - 'recurring', 'once-every' or 'once'
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* recurring
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waveLow <int> - wave in which this entry will start spawning enemies
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[waveHigh] <int> - wave in which this entry will stop spawning enemies
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* once-every
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every <int> - every x wave this entry will spawn enemies
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* once
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wave <int> - wave in which this entry will spawn enemies
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[oneAfterAnother] <bool> - If true, enemy types specified below will be spawned one-after-another
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enemies: [{
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type <string> - type of enemy
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count <int> - base count to spawn
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[incrementCount] <bool> - increments count by wave number
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[countFactor] <int> - this number is multiplied by the wave and then added to count only if incrementCount is true
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[incrementHealth] <bool> - increments health by wave number times healthFactor (default is 5)
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[healthFactor] <int> - this number is multiplied by the wave and then added to health only if incrementHealth is true (default is 5)
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}]
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}
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*/
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let Maps = {
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width: 20, // Width of the map
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height: 20, // Height of the map
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tile: 32, // Tile size in pixels (each coordinate is multiplied by this number in rendering)
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first: {
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// map rendering data
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tiles: [
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
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0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
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0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
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0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
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0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
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0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,
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0, 3, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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],
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// enemy follow path
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pathgen: [
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{x: 1, y: 2, end: false},
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{x: 14, y: 2, end: false},
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{x: 14, y: 6, end: false},
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{x: 8, y: 6, end: false},
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{x: 8, y: 10, end: false},
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{x: 17, y: 10, end: false},
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{x: 17, y: 17, end: false},
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{x: 5, y: 17, end: false},
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{x: 5, y: 12, end: false},
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{x: 1, y: 12, end: false},
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{x: 1, y: 17, end: true},
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],
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waves: [
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{
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type: 'recurring',
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waveLow: 0,
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waveHigh: 10,
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oneAfterAnother: false,
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enemies: [{
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type: 'basic',
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count: 5,
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incrementCount: true,
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incrementHealth: true
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}]
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},
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{
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type: 'recurring',
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waveLow: 10,
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waveHigh: 15,
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oneAfterAnother: false,
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enemies: [{
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type: 'basic',
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count: 5,
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incrementCount: true,
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incrementHealth: true
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},
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{
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type: 'speedy',
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count: 10,
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incrementCount: true,
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incrementHealth: true
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}]
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},
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{
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type: 'recurring',
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waveLow: 15,
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oneAfterAnother: false,
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enemies: [{
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type: 'basic',
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count: 5,
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incrementCount: true,
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incrementHealth: true,
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healthFactor: 10
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},
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{
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type: 'speedy',
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count: 10,
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incrementCount: true,
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incrementHealth: true,
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healthFactor: 10
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}]
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},
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{
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type: 'once-every',
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every: 5,
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oneAfterAnother: false,
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enemies: [{
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type: 'tough',
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count: 5,
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incrementCount: true,
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incrementHealth: true
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}]
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},
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{
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type: 'once',
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wave: 3,
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enemies: [{
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type: 'tough',
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count: 1
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}]
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}
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]
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}
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}
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let Components = {}
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class Component {
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constructor (x, y) {
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this.visible = true
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this.elements = []
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this.x = x
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this.y = y
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}
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elDraw() {
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for (let i in this.elements) {
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let elem = this.elements[i]
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if (elem instanceof Component) {
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elem.draw()
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}
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}
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}
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elUpdate() {
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for (let i in this.elements) {
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let elem = this.elements[i]
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if (elem instanceof Component) {
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elem.update()
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}
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}
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}
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addElement (el) {
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if (!(el instanceof Component)) return
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this.elements.push(el)
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}
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draw () {
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this.elDraw()
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}
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update() {
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this.elUpdate()
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}
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}
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class Tooltip extends Component {
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constructor () {
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super(0, 0)
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this.font = '20px Helvetica'
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this.text = ''
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this.w = 0
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this.h = 24
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this.components = []
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this.visible = false
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}
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static assign (tooltip, component, text) {
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tooltip.addComponent(component, text)
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}
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setText (str) {
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if (this.text === str) return
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this.text = str
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if (this.font) ctx.font = this.font
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this.w = ctx.measureText(this.text).width + this.h
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}
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draw () {
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if (!this.visible) return
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if (this.text === '') return
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if (this.font) ctx.font = this.font
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let aX = this.x
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let aY = this.y
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if (aX + this.w > canvas.width) {
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aX -= this.w + 5
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}
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ctx.fillStyle = 'rgba(255, 255, 255, 0.5)'
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ctx.fillRect(aX, aY, this.w, this.h)
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ctx.fillStyle = '#000'
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ctx.fillText(this.text, aX + this.h / 2, aY + this.h / 2 + 5)
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}
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setPosition (x, y) {
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this.x = x
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this.y = y
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}
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update () {
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if (this.components.length) {
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let cmps = false
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for (let i in this.components) {
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let cmp = this.components[i]
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if (mXr > cmp.x && mYr > cmp.y &&
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mXr < cmp.x + cmp.w && mYr < cmp.y + cmp.h) {
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this.setPosition(mXr, mYr)
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this.setText(cmp.text)
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cmps = true
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}
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}
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this.visible = cmps
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}
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}
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addComponent (component, text) {
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this.components.push({
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x: component.x,
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y: component.y,
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w: component.w,
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h: component.h,
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text: text
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})
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}
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}
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class ButtonComponent extends Component {
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constructor (text, textColor, color, x, y, w, h, fn) {
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super(x, y)
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this.w = w
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this.h = h
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this.fn = () => {
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fn.apply(this, [])
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}
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this.text = text
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this.textColor = textColor
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this.color = color
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this.disabled = false
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this.hovered = false
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this.font = '20px Helvetica'
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}
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draw () {
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if (!this.visible) return
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if (this.font) ctx.font = this.font
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ctx.fillStyle = this.color
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ctx.fillRect(this.x, this.y, this.w, this.h)
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ctx.fillStyle = this.textColor
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let txtMeasure = ctx.measureText(this.text)
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let tx = this.x + (this.w / 2 - txtMeasure.width / 2)
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let ty = this.y + (this.h / 2) * 1.2
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ctx.fillText(this.text, tx, ty)
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if (this.disabled) {
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ctx.fillStyle = 'rgba(0, 0, 0, 0.45)'
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ctx.fillRect(this.x, this.y, this.w, this.h)
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} else if (this.hovered) {
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ctx.fillStyle = 'rgba(255, 255, 255, 0.15)'
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ctx.fillRect(this.x, this.y, this.w, this.h)
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}
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this.elDraw()
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}
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update () {
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if (!this.visible || this.disabled) return
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if (mXr > this.x && mYr > this.y && mXr < this.x + this.w && mYr < this.y + this.h) {
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this.hovered = true
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} else if (this.hovered) {
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this.hovered = false
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}
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}
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setDisabled (disable) {
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this.disabled = typeof disabled === 'boolean' ? disabled : !this.disabled
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}
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}
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class TowerButton extends ButtonComponent {
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constructor (tower, i) {
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super()
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this.active = false
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this.w = 50
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this.h = 50
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this.x = (Maps.width * Maps.tile) + (i % 4) * (this.w + 4) + 4
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this.y = 80 + Math.floor(i / 4) * (this.h + 4)
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this.tower = tower
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this.towerObj = Towers[this.tower]
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this.costText = '$' + this.towerObj.cost
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this.text = this.towerObj.name
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this.textColor = '#fff'
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this.color = '#995522'
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this.fn = this.select
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}
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select () {
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Game.tower = this.tower
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}
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addTooltip () {
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Tooltip.assign(Components.tooltip, this, this.towerObj.description)
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}
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update () {
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super.update()
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this.disabled = this.towerObj.cost > Game.money && !Game.debug
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this.active = Game.tower === this.tower
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this.elUpdate()
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}
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draw () {
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if (!this.visible) return
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if (this.active) {
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ctx.fillStyle = '#afa'
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ctx.fillRect(this.x - 2, this.y - 2, this.w + 4, this.h + 4)
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}
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ctx.font = '14px Helvetica'
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ctx.fillStyle = this.color
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ctx.fillRect(this.x, this.y, this.w, this.h)
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ctx.fillStyle = this.textColor
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let txtMeasure = ctx.measureText(this.text)
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let tx = this.x + (this.w / 2 - txtMeasure.width / 2)
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let ty = this.y + (this.h / 2) * 1
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ctx.fillText(this.text, tx, ty)
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ctx.font = '10px Helvetica'
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if (Game.money >= this.towerObj.cost) {
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ctx.fillStyle = '#0f0'
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} else {
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ctx.fillStyle = '#f11'
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}
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txtMeasure = ctx.measureText(this.costText)
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tx = this.x + (this.w / 2 - txtMeasure.width / 2)
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ty = this.y + (this.h / 2) * 1.6
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ctx.fillText(this.costText, tx, ty)
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if (this.disabled) {
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ctx.fillStyle = 'rgba(0, 0, 0, 0.45)'
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ctx.fillRect(this.x, this.y, this.w, this.h)
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} else if (this.hovered) {
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ctx.fillStyle = 'rgba(255, 255, 255, 0.15)'
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ctx.fillRect(this.x, this.y, this.w, this.h)
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}
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this.elDraw()
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}
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}
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class InfoDialog extends Component {
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constructor () {
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super()
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this.x = 0
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this.y = (Maps.height - 5) * Maps.tile
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this.w = Maps.width * Maps.tile
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this.h = 5 * Maps.tile
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this.createButton()
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}
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createButton () {
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let btn = new ButtonComponent('Sell Tower', '#fff', '#f11', 490, 590, 140, 40, () => {
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if (Game.towerSel) {
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sellTower(Game.towerSel.x, Game.towerSel.y)
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}
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})
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btn.update = function () {
|
|
this.visible = Game.towerSel !== null
|
|
if (!this.visible) return
|
|
if (mXr > this.x && mYr > this.y && mXr < this.x + this.w && mYr < this.y + this.h) {
|
|
this.hovered = true
|
|
} else if (this.hovered) {
|
|
this.hovered = false
|
|
}
|
|
}
|
|
|
|
this.addElement(btn)
|
|
}
|
|
|
|
draw () {
|
|
if (Game.towerSel) {
|
|
let ts = Game.towerSel
|
|
|
|
ctx.fillStyle = 'rgba(0, 0, 0, 0.45)'
|
|
ctx.fillRect(this.x, this.y, this.w, this.h)
|
|
|
|
ctx.fillStyle = '#fff'
|
|
ctx.font = '25px Helvetica'
|
|
ctx.fillText(ts.name + ' Tower', 5, this.y + 25)
|
|
|
|
ctx.font = '15px Helvetica'
|
|
ctx.fillText(ts.description, 5, this.y + 42)
|
|
|
|
ctx.fillText('Range: ' + ts.range + ' tiles', 5, this.y + 70)
|
|
ctx.fillText('Damage: ' + ts.damage + ' HP', 5, this.y + 85)
|
|
ctx.fillText('Fire Rate: ' + ts.rate, 5, this.y + 100)
|
|
ctx.fillText('Kills: ' + ts.killcount, 5, this.y + 115)
|
|
ctx.fillText('Fired ' + ts.fires + ' times', 5, this.y + 130)
|
|
}
|
|
this.elDraw()
|
|
}
|
|
}
|
|
|
|
function clickBtn (cmp) {
|
|
let click = false
|
|
let compList = cmp != null && cmp instanceof Component ? cmp.elements : null
|
|
if (cmp == null && compList == null) {
|
|
compList = Components
|
|
}
|
|
|
|
for (let i in compList) {
|
|
let btn = compList[i]
|
|
|
|
if (!(btn instanceof ButtonComponent)) {
|
|
// Loop through sub-components of components
|
|
if (btn.elements.length) {
|
|
click = clickBtn(btn)
|
|
} else {
|
|
continue
|
|
}
|
|
} else {
|
|
// Click the button if its in bounds, visible and not disabled
|
|
if (btn.disabled || !btn.visible) continue
|
|
if (mXr > btn.x && mYr > btn.y && mXr < btn.x + btn.w && mYr < btn.y + btn.h && btn) {
|
|
btn.fn()
|
|
click = true
|
|
}
|
|
}
|
|
}
|
|
return click
|
|
}
|
|
|
|
function updateComponents (cmp) {
|
|
// Determine which object of components to update
|
|
let compList = cmp != null && cmp instanceof Component ? cmp.elements : null
|
|
if (cmp == null && compList == null) {
|
|
compList = Components
|
|
}
|
|
|
|
for (let i in compList) {
|
|
let component = compList[i]
|
|
component.update()
|
|
|
|
if (component.elements.length) {
|
|
updateComponents(component)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Total enemy spawn count is used to determine that the round is over
|
|
// Local (in-function) determines how many there are left to spawn as ordered by the function call
|
|
function addEnemies (enemies, type, specs) {
|
|
let path = Game.map.pathgen[0]
|
|
let enemy = Enemies[type]
|
|
|
|
// Copy the enemy and add x and y coordinates
|
|
let enemyCopy = Object.assign({
|
|
x: path.x,
|
|
y: path.y
|
|
}, enemy)
|
|
|
|
// Modify the enemy according to wave settings
|
|
if (specs.healthIncrease) {
|
|
enemyCopy.health += specs.healthIncrease
|
|
}
|
|
|
|
if (specs.speedIncrease) {
|
|
enemyCopy.speed += specs.speedIncrease
|
|
}
|
|
|
|
enemyCopy.dmg = enemyCopy.health
|
|
|
|
// Insert them into the spawn queue
|
|
for (let i = 0; i < enemies; i++) {
|
|
let spawnTime = enemyCopy.frequency * i + (specs.multiply ? (specs.multiply * (enemies * enemyCopy.frequency)) : 0)
|
|
if (Game.debug) {
|
|
console.log('added %s to spawn at %d', type, spawnTime)
|
|
}
|
|
|
|
Game.enemySpawnList.push(Object.assign({
|
|
time: spawnTime
|
|
}, enemyCopy))
|
|
}
|
|
}
|
|
|
|
function nextWave () {
|
|
Game.wave++
|
|
|
|
for (let i in Game.map.waves) {
|
|
let wv = Game.map.waves[i]
|
|
let eSpawn = false
|
|
if (wv.type === 'once-every' && Game.wave % wv.every === 0) {
|
|
eSpawn = true
|
|
} else if (wv.type === 'once' && Game.wave === wv.wave) {
|
|
eSpawn = true
|
|
} else if (wv.type === 'recurring' && Game.wave >= wv.waveLow && (wv.waveHigh ? Game.wave < wv.waveHigh : true)) {
|
|
eSpawn = true
|
|
}
|
|
|
|
if (!eSpawn) continue
|
|
for (let i in wv.enemies) {
|
|
let e = wv.enemies[i]
|
|
let eCount = e.count || 5
|
|
let eHealthIncl = 0
|
|
let multiply = wv.oneAfterAnother != null ? wv.oneAfterAnother : false
|
|
|
|
if (e.incrementCount === true) {
|
|
eCount += Game.wave * (e.countFactor != null ? e.countFactor : 1)
|
|
}
|
|
|
|
if (e.baseHealth) {
|
|
eHealthIncl = e.baseHealth
|
|
}
|
|
|
|
if (e.incrementHealth === true) {
|
|
eHealthIncl = Game.wave * (e.healthFactor != null ? e.healthFactor : 5)
|
|
if (eHealthIncl > 500) {
|
|
eHealthIncl = 500
|
|
}
|
|
}
|
|
|
|
addEnemies(eCount, e.type, {
|
|
healthIncrease: eHealthIncl,
|
|
multiply: multiply ? parseInt(i) : false
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
function getTileIn (map, x, y) {
|
|
let tile = x + y * Maps.width
|
|
return map[tile]
|
|
}
|
|
|
|
function updateGameState (gst) {
|
|
if (Game.state !== -1 && Game.health <= 0) {
|
|
Game.health = 0
|
|
Game.state = -1
|
|
Game.towerSel = null
|
|
}
|
|
|
|
if (Game.state === 2 && gst === 1) {
|
|
nextWave()
|
|
}
|
|
|
|
if (gst === 2 && Game.state === 1) {
|
|
Game.waveTimer = 0
|
|
}
|
|
|
|
if (gst != null) {
|
|
Game.state = gst
|
|
}
|
|
|
|
Components.wave.disabled = (Game.state !== 2)
|
|
}
|
|
|
|
function updateEnemyMovements () {
|
|
for (let i in Game.enemies) {
|
|
let enemy = Game.enemies[i]
|
|
let enemyTrackTarget = Game.map.pathgen[enemy.node]
|
|
if (enemyTrackTarget) {
|
|
let tx = enemyTrackTarget.x
|
|
let ty = enemyTrackTarget.y
|
|
let vexLen = Math.sqrt(Math.pow(tx - enemy.x, 2) + Math.pow(ty - enemy.y, 2))
|
|
let velX = (tx - enemy.x) / Math.abs(vexLen)
|
|
let velY = (ty - enemy.y) / Math.abs(vexLen)
|
|
enemy.velocity = {x: velX, y: velY, dist: Math.abs(vexLen)}
|
|
}
|
|
|
|
if (enemy.velocity.dist > 0.1) {
|
|
enemy.x += (enemy.velocity.x * 0.01) * enemy.speed
|
|
enemy.y += (enemy.velocity.y * 0.01) * enemy.speed
|
|
} else {
|
|
if (Game.map.pathgen[enemy.node + 1]) {
|
|
enemy.node += 1
|
|
} else if (enemyTrackTarget.end === true) {
|
|
Game.enemies.splice(i, 1)
|
|
Game.health -= Math.floor(enemy.dmg / 2)
|
|
if (Game.health < 0) {
|
|
Game.health = 0
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (Game.state === 1 && Game.enemies.length === 0 && Game.enemySpawnList.length === 0) {
|
|
updateGameState(2)
|
|
}
|
|
}
|
|
|
|
function towerFire (tower) {
|
|
let enemiesProxima = []
|
|
let target = null
|
|
|
|
for (let i in Game.enemies) {
|
|
let enemy = Game.enemies[i]
|
|
let proxi = Math.abs(Math.sqrt(Math.pow(enemy.x - tower.x, 2) + Math.pow(enemy.y - tower.y, 2)))
|
|
if (proxi > tower.range) continue
|
|
enemiesProxima.push(Object.assign({dist: proxi}, enemy))
|
|
}
|
|
|
|
if (!enemiesProxima.length) return
|
|
|
|
enemiesProxima.sort((a, b) => {
|
|
return a.dist - b.dist
|
|
})
|
|
|
|
if (tower.setting === 1) {
|
|
target = enemiesProxima[0]
|
|
} else {
|
|
target = enemiesProxima[enemiesProxima.length - 1]
|
|
}
|
|
|
|
tower.fires++
|
|
|
|
Game.particles.push({
|
|
x: tower.x,
|
|
y: tower.y,
|
|
tower: {x: tower.x, y: tower.y},
|
|
velX: (target.x - tower.x) / target.dist * 1.24,
|
|
velY: (target.y - tower.y) / target.dist * 1.24,
|
|
dmg: tower.damage,
|
|
speed: tower.speed,
|
|
type: tower.bullet || 1,
|
|
life: 30
|
|
})
|
|
}
|
|
|
|
function tickTowers () {
|
|
for (let i in Game.towers) {
|
|
let tower = Game.towers[i]
|
|
|
|
// Tick towers
|
|
tower.tick++
|
|
tower.tick %= tower.rate
|
|
|
|
// fire
|
|
if (tower.tick === 0) {
|
|
towerFire(tower)
|
|
}
|
|
}
|
|
}
|
|
|
|
function tickParticles () {
|
|
for (let i in Game.particles) {
|
|
let parti = Game.particles[i]
|
|
parti.x += parti.velX * 0.01 * parti.speed
|
|
parti.y += parti.velY * 0.01 * parti.speed
|
|
|
|
parti.life--
|
|
if (parti.life <= 0) {
|
|
Game.particles.splice(i, 1)
|
|
continue
|
|
}
|
|
|
|
for (let j in Game.enemies) {
|
|
let enemy = Game.enemies[j]
|
|
|
|
if (parti.x >= enemy.x - 0.25 && parti.y >= enemy.y - 0.25 &&
|
|
parti.x <= enemy.x + 0.5 && parti.y <= enemy.y + 0.5) {
|
|
// damage enemy
|
|
if (parti.type === 1) {
|
|
enemy.dmg -= parti.dmg
|
|
|
|
if (enemy.dmg <= 0) {
|
|
Game.enemies.splice(j, 1)
|
|
Game.money += 10
|
|
|
|
let tower = getTowerAt(parti.tower.x, parti.tower.y)
|
|
if (tower) {
|
|
tower.killcount++
|
|
}
|
|
}
|
|
} else if (parti.type === 2) {
|
|
enemy.speed -= parti.dmg
|
|
if (enemy.speed < 2) {
|
|
enemy.speed = 2
|
|
}
|
|
}
|
|
|
|
// remove particle
|
|
Game.particles.splice(i, 1)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Render text telling the amount of money received when selling a tower
|
|
// Disappears after 30 game ticks
|
|
function tickSellText () {
|
|
for (let i in Game.selltext) {
|
|
let txt = Game.selltext[i]
|
|
txt.tick++
|
|
txt.tick %= 30
|
|
if (txt.tick === 0) {
|
|
Game.selltext.splice(i, 1)
|
|
continue
|
|
}
|
|
|
|
txt.y -= 0.05
|
|
}
|
|
}
|
|
|
|
function selectTower (x, y) {
|
|
let tower = getTowerAt(x, y)
|
|
Game.towerSel = tower
|
|
}
|
|
|
|
function spawnQueue () {
|
|
if (Game.enemySpawnList.length) {
|
|
for (let i in Game.enemySpawnList) {
|
|
let ef = Game.enemySpawnList[i]
|
|
if (ef.time < Game.waveTimer) {
|
|
Game.enemies.push(ef)
|
|
Game.enemySpawnList.splice(i, 1)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function getTowerAt (x, y) {
|
|
for (let i in Game.towers) {
|
|
let tower = Game.towers[i]
|
|
if (tower.x === x && tower.y === y) return tower
|
|
}
|
|
|
|
return null
|
|
}
|
|
|
|
function canPlaceTowerAt (x, y) {
|
|
let tileAt = getTileIn(Game.map.tiles, x, y)
|
|
if (tileAt !== 0) return false
|
|
|
|
// Do not overlap towers
|
|
if (getTowerAt(x, y) !== null) return false
|
|
|
|
// Prevent towers from being placed right next to each-other
|
|
let can = true
|
|
for (let j in Game.towers) {
|
|
if (can === false) break
|
|
let tower = Game.towers[j]
|
|
|
|
// Tower placement restriction around the tower
|
|
for (let i = 0; i < 4; i++) {
|
|
if (can === false) break
|
|
let ax = tower.x
|
|
let ay = tower.y
|
|
if (i == 0) {
|
|
ax -= 1
|
|
} else if (i == 1) {
|
|
ax += 1
|
|
} else if (i == 2) {
|
|
ay -= 1
|
|
} else if (i == 3) {
|
|
ay += 1
|
|
}
|
|
|
|
if (ax < 0 || ay < 0 || ay > Maps.height || ax > Maps.width) continue
|
|
if (ax === x && ay === y) can = false
|
|
}
|
|
}
|
|
|
|
return can
|
|
}
|
|
|
|
function placeTower (tower, x, y) {
|
|
if (tower.cost > Game.money && !Game.debug) return // no money
|
|
|
|
if (!canPlaceTowerAt(x, y)) return
|
|
|
|
if (!Game.debug) {
|
|
Game.money -= tower.cost
|
|
}
|
|
|
|
Game.towers.push(Object.assign({
|
|
x: x,
|
|
y: y,
|
|
tick: tower.rate,
|
|
setting: 1,
|
|
fires: 0,
|
|
killcount: 0
|
|
}, tower))
|
|
}
|
|
|
|
function sellTower (x, y) {
|
|
let tower = getTowerAt(x, y)
|
|
if (tower) {
|
|
let amount = tower.cost * Game.sellRatio
|
|
Game.money += amount
|
|
Game.selltext.push({
|
|
x: x,
|
|
y: y,
|
|
amount: amount,
|
|
tick: 0
|
|
})
|
|
|
|
if (Game.towerSel && Game.towerSel.x === x && Game.towerSel.y === y) {
|
|
Game.towerSel = null
|
|
}
|
|
|
|
return Game.towers.splice(Game.towers.indexOf(tower), 1)
|
|
} else {
|
|
return null
|
|
}
|
|
}
|
|
|
|
function update (dt) {
|
|
// Update FPS count for drawing (Don't render a new number every frame, it changes too fast)
|
|
fpsCount++
|
|
fpsCount %= 20
|
|
if (fpsCount === 0) {
|
|
fpsDraw = fps
|
|
}
|
|
|
|
// Only tick towers when the game is in the play state
|
|
if (Game.state === 1) {
|
|
tickTowers()
|
|
}
|
|
|
|
// Move enemies
|
|
updateEnemyMovements()
|
|
|
|
// Move bullets
|
|
tickParticles()
|
|
|
|
// Move sell texts
|
|
tickSellText()
|
|
|
|
// Update all components (eg buttons)
|
|
updateComponents()
|
|
|
|
// Set the state
|
|
updateGameState()
|
|
|
|
// Increment game clock
|
|
if (Game.state === 1) {
|
|
Game.waveTimer++
|
|
}
|
|
|
|
spawnQueue()
|
|
}
|
|
|
|
let lastRenderTime = Date.now()
|
|
function render () {
|
|
let mt = Maps.tile
|
|
ctx.fillStyle = '#0fa'
|
|
ctx.fillRect(0, 0, canvas.width, canvas.height)
|
|
|
|
// Draw the map
|
|
for (let i in Game.map.tiles) {
|
|
let tile = Game.map.tiles[i]
|
|
let index = parseInt(i)
|
|
let y = Math.floor(index / Maps.width)
|
|
let x = Math.floor(index % Maps.height)
|
|
let draw_tile = true
|
|
|
|
if (tile === 1) {
|
|
ctx.fillStyle = '#fdd'
|
|
} else if (tile === 2) {
|
|
ctx.fillStyle = '#aaf'
|
|
} else if (tile === 3) {
|
|
ctx.fillStyle = '#f3a'
|
|
} else {
|
|
draw_tile = false
|
|
}
|
|
|
|
if (draw_tile) {
|
|
ctx.fillRect(x * mt, y * mt, mt, mt)
|
|
}
|
|
|
|
// Draw obstructed tiles
|
|
if (Game.state === 2 && tile === 0 && !canPlaceTowerAt(x, y)) {
|
|
ctx.fillStyle = '#738c5d'
|
|
ctx.fillRect(x * mt, y * mt, mt, mt)
|
|
}
|
|
}
|
|
|
|
// Show the enemy movement path
|
|
if (Game.debug) {
|
|
for (let i in Game.map.pathgen) {
|
|
let node = Game.map.pathgen[i]
|
|
ctx.fillStyle = '#00f'
|
|
ctx.fillRect((node.x * mt) + mt / 3, (node.y * mt) + mt / 3, 8, 8)
|
|
}
|
|
}
|
|
|
|
// Draw towers
|
|
for (let i in Game.towers) {
|
|
let tower = Game.towers[i]
|
|
ctx.fillStyle = tower.icon
|
|
ctx.fillRect(tower.x * mt + 2, tower.y * mt + 2, 28, 28)
|
|
|
|
if (Game.debug) {
|
|
ctx.fillStyle = '#f11'
|
|
ctx.font = '10px Helvetica'
|
|
ctx.fillText(tower.tick, tower.x * mt + 10, tower.y * mt + 25)
|
|
}
|
|
}
|
|
|
|
// Draw enemies
|
|
for (let i in Game.enemies) {
|
|
let margin = .25 //A ratio of the width of a tile. .25 margins with 32 px tiles leave a 8 px margin on all sides, with the body being 16px x 16px
|
|
let enemy = Game.enemies[i]
|
|
let rx = (enemy.x + margin) * mt
|
|
let ry = (enemy.y + margin) * mt
|
|
let w = mt * (1 - margin * 2)
|
|
ctx.fillStyle = enemy.icon
|
|
ctx.fillRect(rx, ry, w, w)
|
|
|
|
// health bars
|
|
let hx = rx - 6
|
|
let hy = ry - 12
|
|
ctx.fillStyle = '#f00'
|
|
ctx.fillRect(hx, hy, 16 + 12, 5)
|
|
|
|
ctx.fillStyle = '#0f0'
|
|
ctx.fillRect(hx, hy, (16 + 12) * enemy.dmg / enemy.health, 5)
|
|
|
|
if (Game.debug) {
|
|
ctx.fillStyle = '#511'
|
|
ctx.font = '10px Helvetica'
|
|
ctx.fillText(enemy.dmg, hx + 10, hy + 25)
|
|
}
|
|
}
|
|
|
|
// Draw bullets
|
|
for (let i in Game.particles) {
|
|
let tower = Game.particles[i]
|
|
ctx.fillStyle = '#f33'
|
|
ctx.fillRect(tower.x * mt + mt / 16, tower.y * mt + mt / 16, 8, 8)
|
|
}
|
|
|
|
// Tower range visualization
|
|
let towerData = Towers[Game.tower]
|
|
let vX = null
|
|
let vY = null
|
|
|
|
// Render the currently selected tower's range if present
|
|
if (Game.towerSel) {
|
|
towerData = Game.towerSel
|
|
vX = towerData.x
|
|
vY = towerData.y
|
|
} else if (towerData != null && towerData.cost <= Game.money && canPlaceTowerAt(mX, mY) &&
|
|
mX < Maps.width && mY < Maps.height && Game.state === 2) {
|
|
vX = mX
|
|
vY = mY
|
|
}
|
|
|
|
// Render range
|
|
if (vX != null && vY != null && towerData) {
|
|
ctx.strokeStyle = '#ddd'
|
|
ctx.fillStyle = 'rgba(200, 200, 200, 0.25)'
|
|
ctx.beginPath()
|
|
ctx.arc(vX * mt + mt / 2, vY * mt + mt / 2, towerData.range * mt, 0, 2 * Math.PI)
|
|
ctx.stroke()
|
|
ctx.fill()
|
|
ctx.closePath()
|
|
}
|
|
|
|
// Render sell text
|
|
for (let i in Game.selltext) {
|
|
let txt = Game.selltext[i]
|
|
ctx.font = '12px Helvetica'
|
|
ctx.fillStyle = '#0a0'
|
|
ctx.fillText('+ $' + txt.amount, txt.x * mt, txt.y * mt)
|
|
}
|
|
|
|
// Render sidebar background
|
|
ctx.fillStyle = '#996633'
|
|
ctx.fillRect(640, 0, 240, 640)
|
|
|
|
// Render sidebar text
|
|
ctx.font = '20px Helvetica'
|
|
ctx.fillStyle = '#fff'
|
|
ctx.fillText('FPS: ' + fpsDraw.toFixed(2), 0, 20)
|
|
ctx.fillText('Wave: ' + Game.wave, 645, 25)
|
|
ctx.fillText('Health: ' + Game.health, 645, 45)
|
|
ctx.fillText('Money: ' + Game.money, 645, 65)
|
|
|
|
// Game Over text
|
|
if (Game.state === -1) {
|
|
ctx.font = '80px Helvetica'
|
|
ctx.fillStyle = '#f00'
|
|
ctx.fillText('Game Over', 100, canvas.height / 2 - 80 / 2)
|
|
}
|
|
|
|
// Draw mouse cursor
|
|
if (mX < Maps.width && mY < Maps.height) {
|
|
ctx.fillStyle = 'rgba(255, 0, 0, 0.24)'
|
|
ctx.fillRect(mX * mt, mY * mt, mt, mt)
|
|
}
|
|
|
|
// Draw all components
|
|
for (let i in Components) {
|
|
let cmp = Components[i]
|
|
if (!(cmp) instanceof Component) continue
|
|
cmp.draw()
|
|
}
|
|
|
|
if (Game.debug) {
|
|
ctx.fillStyle = '#f11'
|
|
ctx.font = '10px Helvetica'
|
|
ctx.fillText('enemy queue length ' + Game.enemySpawnList.length, 5, 580)
|
|
ctx.fillText('enemy count ' + Game.enemies.length, 5, 590)
|
|
ctx.fillText('tower count ' + Game.towers.length, 5, 600)
|
|
ctx.fillText('particle count ' + Game.particles.length, 5, 610)
|
|
ctx.fillText('render tick ms ' + (Date.now() - lastRenderTime), 5, 620)
|
|
lastRenderTime = Date.now()
|
|
}
|
|
}
|
|
|
|
let lastTime = Date.now()
|
|
let now
|
|
let fpsRes = 50
|
|
|
|
function gameLoop () {
|
|
update()
|
|
render()
|
|
|
|
// Update FPS
|
|
let cfps = 1000 / ((now = new Date) - lastTime)
|
|
if (now != lastTime) {
|
|
fps += (cfps - fps) / fpsRes
|
|
lastTime = now
|
|
}
|
|
|
|
requestAnimationFrame(gameLoop)
|
|
}
|
|
|
|
function initialize () {
|
|
Game.map = Maps.first
|
|
|
|
// Next wave button
|
|
Components.wave = new ButtonComponent('Next Wave', '#fff', '#11f', 650, 570, 200, 60, () => {
|
|
updateGameState(1)
|
|
})
|
|
|
|
// Tower information box
|
|
Components.info = new InfoDialog()
|
|
|
|
// Add buy buttons to every tower
|
|
let index = 0
|
|
for (let i in Towers) {
|
|
Components[i] = new TowerButton(i, index)
|
|
index++
|
|
}
|
|
|
|
// Tooltip
|
|
Components.tooltip = new Tooltip()
|
|
for (let i in Towers) {
|
|
let cmp = Components[i]
|
|
if (!cmp) continue
|
|
Components.tooltip.addComponent(cmp, cmp.towerObj.description)
|
|
}
|
|
|
|
// Start the game
|
|
gameLoop()
|
|
}
|
|
|
|
canvas.addEventListener('click', (e) => {
|
|
if (clickBtn()) return
|
|
if (mX < Maps.width && mY < Maps.height) {
|
|
// Select a tower if present
|
|
if (getTowerAt(mX, mY)) {
|
|
return selectTower(mX, mY)
|
|
} else if (Game.towerSel) {
|
|
Game.towerSel = null
|
|
return
|
|
}
|
|
|
|
// Place a tower
|
|
if (!Game.tower || Game.state !== 2) return
|
|
placeTower(Towers[Game.tower], mX, mY)
|
|
}
|
|
})
|
|
|
|
canvas.addEventListener('contextmenu', (e) => {
|
|
if (Game.state === 2 && mX < Maps.width && mY < Maps.height &&
|
|
sellTower(mX, mY)) {
|
|
e.preventDefault()
|
|
}
|
|
})
|
|
|
|
canvas.addEventListener('mousemove', (e) => {
|
|
if (e.changedTouches) {
|
|
let touch = e.changedTouches[0]
|
|
if (touch) {
|
|
e.pageX = touch.pageX
|
|
e.pageY = touch.pageY
|
|
}
|
|
}
|
|
|
|
if (e.pageX || e.pageY) {
|
|
mXr = e.pageX
|
|
mYr = e.pageY
|
|
} else {
|
|
mXr = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft
|
|
mYr = e.clientY + document.body.scrollTop + document.documentElement.scrollTop
|
|
}
|
|
|
|
mXr -= canvas.offsetLeft
|
|
mYr -= canvas.offsetTop
|
|
|
|
mX = Math.floor(mXr / Maps.tile)
|
|
mY = Math.floor(mYr / Maps.tile)
|
|
})
|
|
|
|
initialize()
|
|
}
|