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class Game {
constructor(canvas, width, height) {
this.buffer = document.createElement("canvas");
this.buffer.width = width;
this.buffer.height = height;
this.ctx = this.buffer.getContext("2d");
this.canvas = canvas;
this.width = width;
this.height = height;
// override this with your data to be loaded:
//
// { id: "file.png" }
//
// Supports .png, .ogg and .json files.
//
// and also override dataSize with:
//
// this.dataSize = Object.keys(this.data).length
//
this.data = {};
this.dataSize = 0;
// override to change keys
this.controls = {
80: "pause",
83: "start",
37: "left",
38: "up",
39: "right",
40: "down",
90: "a",
88: "b"
};
this.scale = 1;
// will store the resouces indexed by id
this.res = {};
this.resSize = 0;
// override if you want to change the limit
// defaults to 8 "channels"
this.playLimit = 8;
this.playCount = 0;
// test to see if a key is down or not
this.keys = {
pause: false,
start: false,
left: false,
up: false,
right: false,
down: false,
a: false,
b: false
};
this.minFps = 60;
this.then = -1 / 60;
this.loadingError = undefined;
}
start() {
this.canvas.style.background = "rgb(21, 21, 21)";
this.resize();
window.onresize = (ev) => {
this.resize();
};
this.loader();
}
// override this
init() {}
// override this
update(dt) {}
// override this
draw() {}
_update(dt) {}
_draw() {}
resize() {
this.scale = Math.floor(window.innerHeight / this.height);
this.canvas.width = this.width * this.scale;
this.canvas.height = this.height * this.scale;
}
loop(now) {
let dt = Math.min(1 / this.minFps, now - this.then);
this._update(dt);
this._draw();
this.then = now;
requestAnimationFrame((now) => {
this.loop(now)
});
}
loader() {
this._draw = this.drawLoading;
this.loop(0);
const onError = (ev) => {
console.log(ev);
this.loadingError = true;
};
for (const id in this.data) {
if (this.data[id].indexOf(".png") != -1) {
this.res[id] = new Image();
this.res[id].src = this.data[id];
this.res[id].onerror = onError
this.res[id].onload = (ev) => {
this.res[id].onload = null;
ev.currentTarget.removeEventListener("error", onError);
this.resSize += 1;
};
continue;
}
if (this.data[id].indexOf(".ogg") != -1) {
this.res[id] = new Audio();
this.res[id].src = this.data[id];
this.res[id].autoplay = false;
this.res[id].addEventListener("error", onError);
this.res[id].oncanplaythrough = (ev) => {
this.res[id].oncanplaythrough = null;
ev.currentTarget.removeEventListener("error", onError);
this.resSize += 1;
};
continue;
}
if (this.data[id].indexOf(".json") != -1) {
let xhr = new window.XMLHttpRequest();
xhr.open("GET", this.data[id]);
xhr.responseType = "json";
xhr.addEventListener("error", onError);
xhr.onload = (ev) => {
ev.currentTarget.removeEventListener("error", onError);
xhr.onload = null;
if (xhr.status == 200) {
this.res[id] = xhr.response;
this.resSize += 1;
} else {
console.log(ev);
this.loadingError = true;
}
};
xhr.send();
continue;
}
}
}
// won't use drawStart/drawEnd because may render regular fonts
drawLoading() {
// height of the loading bar
const h = 20;
let ctx = this.canvas.getContext("2d");
ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
ctx.save();
if (this.loadingError == true) {
ctx.fillStyle = "rgb(255, 128, 128)";
ctx.font = "caption";
ctx.fillText(
"ERROR Loading Resources",
Math.floor(ctx.canvas.width * 0.1),
Math.floor(ctx.canvas.height / 2 - h - h / 2)
);
}
ctx.fillStyle = "rgb(128, 128, 128)";
ctx.fillRect(Math.floor(ctx.canvas.width * 0.1), Math.floor(ctx.canvas.height / 2) - h, ctx.canvas.width - Math.floor(ctx.canvas.width * 0.2), h);
ctx.fillStyle = "rgb(255, 255, 255)";
ctx.fillRect(Math.floor(ctx.canvas.width * 0.1), Math.floor(ctx.canvas.height / 2) - h, (
Math.floor(ctx.canvas.resSize * (ctx.canvas.width - Math.floor(ctx.canvas.width * 0.2)) / ctx.canvas.dataSize)
), h);
ctx.restore();
// we don't do this on update because we want
// the progress bar to finish drawing
if (this.resSize == this.dataSize) {
console.log("Loader done");
document.addEventListener("keydown", (ev) => {
this.keyDown(ev)
}, false);
document.addEventListener("keyup", (ev) => {
this.keyUp(ev)
}, false);
this.init();
this._update = this.update;
this._draw = () => {
this.ctx.clearRect(0, 0, this.width, this.height);
this.draw();
let ctx = this.canvas.getContext("2d");
ctx.save();
ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
ctx.imageSmoothingEnabled = false;
ctx.scale(this.scale, this.scale);
ctx.drawImage(this.buffer, 0, 0);
ctx.restore();
};
}
}
playSnd(playable, loop, clone) {
if (this.playCount < this.playLimit) {
this.playCount += 1;
if (clone || false) {
playable = playable.cloneNode(true)
}
playable.onended = (ev) => {
playable.onended = null;
this.playCount -= 1;
};
playable.loop = loop || false;
playable.play();
}
}
keyDown(ev) {
let key = this.controls[ev.keyCode];
if (key != undefined) {
this.keys[key] = true;
ev.preventDefault();
}
}
keyUp(ev) {
let key = this.controls[ev.keyCode];
if (key != undefined) {
this.keys[key] = false;
}
}
}
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