63 lines
1.3 KiB
JavaScript
63 lines
1.3 KiB
JavaScript
function getRGBA(data, i) {
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let out = [];
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for (let j = i * 4; j < i * 4 + 4; j++) {
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out.push(data[j]);
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}
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return out;
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}
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function setRGBA(data, i, input) {
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for (let j = i * 4; j < i * 4 + 4; j++) {
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data[j] = input[j - i * 4];
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}
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}
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function Game(baseMap) {
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this.img = new Image();
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this.baseMap = baseMap;
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}
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Game.prototype.main = function() {
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var {biomes, ctx} = this;
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var dat = ctx.getImageData(0,0,800,400);
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var data = dat.data;
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for (let i = 0; i < biomes.data.length; i++) {
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let rgba = getRGBA(biomes.data,i);
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if (rgba[0] == 255 && rgba[1] == 255 && rgba[2] == 255 && rgba[3] == 255) {
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setRGBA(data,i,[255,255,255,255])
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} else {
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setRGBA(data,i,[0,0,0,255]);
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}
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}
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ctx.putImageData(dat,0,0,0,0,800,400);
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}
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Game.prototype.loop = function() {
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let that = this;
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setInterval(function() { that.main() } ,1000 / 60);
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}
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Game.prototype.startGame = function() {
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var canvas = document.querySelector("#canvas");
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var ctx = canvas.getContext("2d");
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this.ctx = ctx;
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ctx.drawImage(this.img, 0, 0,800,400);
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var dat = ctx.getImageData(0,0,800,400);
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this.biomes = dat;
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this.loop();
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}
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Game.prototype.init = function() {
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let that = this;
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this.img.src = this.baseMap;
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this.img.onload = function() { that.startGame() };
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}
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new Game("base.png").init();
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