83 lines
No EOL
1.7 KiB
JavaScript
83 lines
No EOL
1.7 KiB
JavaScript
const cs = 1024;
|
|
const assets = [
|
|
'assets/player.svg',
|
|
'assets/head.svg',
|
|
];
|
|
|
|
function Game() {
|
|
let canvas = document.querySelector("#canvas");
|
|
|
|
let ctx = canvas.getContext("2d");
|
|
|
|
let camera = { x: 0, y: 0 };
|
|
let pos = { x: 0, y: 0 };
|
|
let vel = { x: 0, y: 0 };
|
|
|
|
canvas.width = canvas.height = cs;
|
|
|
|
this.canvas = canvas;
|
|
this.ctx = ctx;
|
|
this.camera = camera;
|
|
this.pos = pos;
|
|
this.vel = vel;
|
|
this.rot = 0;
|
|
this.assetsIn = {
|
|
|
|
};
|
|
|
|
for (let asset in assets) {
|
|
this.assetsIn[asset] = new Image();
|
|
this.assetsIn[asset].src = assets[asset];
|
|
}
|
|
}
|
|
|
|
Game.prototype.main = function () {
|
|
this.pos.x += this.vel.x;
|
|
this.pos.y += this.vel.y;
|
|
|
|
this.vel.x *= 0.9;
|
|
this.vel.y *= 0.9;
|
|
|
|
this.rot += 0.08;
|
|
this.rot = this.rot % (Math.PI * 10);
|
|
|
|
this.camera.x = -this.pos.x * 0.1 + this.camera.x * 0.9;
|
|
this.camera.y = -this.pos.y * 0.1 + this.camera.y * 0.9;
|
|
}
|
|
|
|
// todo: move into its own file
|
|
Game.prototype.render = function () {
|
|
let { ctx, assetsIn, pos, camera } = this;
|
|
|
|
ctx.clearRect(0, 0, cs, cs);
|
|
|
|
ctx.save();
|
|
|
|
ctx.translate(camera.x + cs/2, camera.y + cs/2);
|
|
|
|
ctx.save();
|
|
|
|
ctx.translate(pos.x, pos.y);
|
|
ctx.rotate(this.rot);
|
|
ctx.drawImage(assetsIn[1], -64 / 2, -128, 64, 128);
|
|
|
|
ctx.restore();
|
|
|
|
ctx.drawImage(assetsIn[0], pos.x - 64 / 2, pos.y - 64 / 2, 64, 64);
|
|
|
|
ctx.restore();
|
|
}
|
|
|
|
Game.prototype.click = function () {
|
|
let { rot } = this;
|
|
|
|
this.vel.x += Math.sin(rot) * 25;
|
|
this.vel.y -= Math.cos(rot) * 25;
|
|
}
|
|
|
|
var game = new Game();
|
|
|
|
setInterval(function () { game.main() }, 1000 / 60);
|
|
setInterval(function () { game.render() }, 1000 / 60);
|
|
|
|
game.canvas.onclick = () => game.click(); |