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pixelrun.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta lang="en-us">
<title>Pixel Run</title>
<style>
body {
background: #333;
}
canvas {
background: #335C67;
padding: 0;
margin: auto;
display: block;
width: 400px;
height: 500px;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
-ms-interpolation-mode: nearest-neighbor;
image-rendering: -webkit-optimize-contrast;
image-rendering: -webkit-crisp-edges;
image-rendering: -moz-crisp-edges;
image-rendering: -o-crisp-edges;
image-rendering: pixelated;
}
</style>
</head>
<body>
<canvas id="game">Sorry, your browser doesn't support HTML5 canvas.</canvas>
<script>
function clamp(val, min, max) {
if (val < min) { return min; } else
if (val > max) { return max; } else {
return val;
}
}
function randInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function hasCollided(rect1, rect2) {
if (rect1.x < rect2.x + rect2.width &&
rect1.x + rect1.width > rect2.x &&
rect1.y < rect2.y + rect2.height &&
rect1.y + rect1.height > rect2.y) {
// collision detected!
return true;
}
return false;
}
class InputManager {
constructor() {
this.keysDown = [];
}
clearKeysDown() { this.keysDown.length = 0; }
setKeyDown(keyCode) { this.keysDown[keyCode] = true; }
setKeyUp(keyCode) { this.keysDown[keyCode] = false; }
isKeyDown(name) {
switch (name) {
case "up": {
var keyW = (this.keysDown[87] !== undefined && this.keysDown[87] !== undefined) ? this.keysDown[87] : false;
var keyUp = (this.keysDown[38] !== undefined && this.keysDown[38] !== undefined) ? this.keysDown[38] : false;
if (keyW || keyUp) { return true; }
break;
}
case "right": {
var keyD = (this.keysDown[68] !== undefined && this.keysDown[68] !== undefined) ? this.keysDown[68] : false;
var keyRight = (this.keysDown[39] !== undefined && this.keysDown[39] !== undefined) ? this.keysDown[39] : false;
if (keyD || keyRight) { return true; }
break;
}
case "down": {
var keyS = (this.keysDown[83] !== undefined && this.keysDown[83] !== undefined) ? this.keysDown[83] : false;
var keyDown = (this.keysDown[40] !== undefined && this.keysDown[40] !== undefined) ? this.keysDown[40] : false;
if (keyS || keyDown) { return true; }
break;
}
case "left": {
var keyA = (this.keysDown[65] !== undefined && this.keysDown[65] !== undefined) ? this.keysDown[65] : false;
var keyLeft = (this.keysDown[37] !== undefined && this.keysDown[37] !== undefined) ? this.keysDown[37] : false;
if (keyA || keyLeft) { return true; }
break;
}
case "enter": {
return (this.keysDown[13] !== undefined && this.keysDown[13] !== undefined) ? this.keysDown[13] : false;
break;
}
}
}
}
class World {
constructor(canvas, ctx, inputManager) {
this.canvas = canvas;
this.ctx = ctx;
this.input = inputManager;
this.tileSize = 4;
this.initialWallGenDelay = 200;
this.wallGenDelay = this.initialWallGenDelay;
this.wallGenTick = 0;
this.walls = [];
this.secondDelay = 60;
this.secondTick = 0;
this.score = 0;
this.gameOver = false;
this.createWorld();
}
resetWorld() {
this.tileSize = 4;
this.initialWallGenDelay = 200;
this.wallGenDelay = this.initialWallGenDelay;
this.wallGenTick = 0;
this.clearWalls();
this.secondDelay = 60;
this.secondTick = 0;
this.score = 0;
this.gameOver = false;
}
createWorld() {
this.player = new Player(
randInt(1, this.canvas.width / this.tileSize) * this.tileSize,
randInt(1, this.canvas.height / this.tileSize) * this.tileSize,
this.tileSize,
"#FFF3B0",
this.input
);
}
isWallPlaceFree(x, y) {
var placeFree = true;
for (var i = 0; i < this.walls.length; i++) {
if (this.walls[i].x == x && this.walls[i].y == y) {
placeFree = false;
}
}
return placeFree;
}
generateWall(x, y) {
this.walls.push(new Wall(x, y, this.tileSize));
}
clearWalls() { this.walls.length = 0; }
update() {
if (!this.gameOver) {
if (this.secondTick < this.secondDelay) {
this.secondTick++;
}
else {
this.score++;
this.wallGenDelay *= 0.95;
this.secondTick = 0;
}
if (this.player) {
this.player.update();
this.player.x = clamp(this.player.x, 0, this.canvas.width - this.tileSize);
this.player.y = clamp(this.player.y, 16, this.canvas.height - this.tileSize);
if (this.player.x == 0 || this.player.x == this.canvas.width - this.tileSize) {
this.player.velX = 0;
}
if (this.player.y == 16 || this.player.y == this.canvas.height - this.tileSize) {
this.player.velY = 0;
}
}
// Update walls
for (var i = 0; i < this.walls.length; i++) {
this.walls[i].update();
if (this.walls[i].state == "solid") {
var playerBox = { x: this.player.x, y: this.player.y, width: this.player.size, height: this.player.size };
var wallBox = { x: this.walls[i].x, y: this.walls[i].y, width: this.walls[i].size, height: this.walls[i].size };
if (hasCollided(playerBox, wallBox)) {
this.gameOver = true;
}
}
}
// Generate walls
if (this.wallGenTick < this.wallGenDelay) {
this.wallGenTick++;
}
else {
let x = randInt(0, this.canvas.width / this.tileSize) * this.tileSize;
let y = randInt(1, this.canvas.height / this.tileSize) * this.tileSize;
if (this.isWallPlaceFree(x, y)) {
this.generateWall(x, y);
}
this.wallGenTick = 0;
}
}
}
draw(ctx) {
if (!this.gameOver) {
this.player.draw(ctx);
}
for (var i = 0; i < this.walls.length; i++) {
this.walls[i].draw(ctx);
}
}
}
class Wall {
constructor(x, y, size) {
this.x = x;
this.y = y;
this.size = size;
this.color = "black";
this.growDuration = 60;
this.growTimer = 0;
this.state = "grow";
}
update() {
switch (this.state) {
case "grow": {
if (this.growTimer < this.growDuration) {
this.color = "#540B0E";
this.growTimer++;
}
else {
this.color = "#E09F3E";
this.state = "solid";
}
break;
}
case "solid": {
break;
}
}
}
draw(ctx) {
ctx.save();
ctx.fillStyle = this.color;
ctx.fillRect(this.x, this.y, this.size, this.size);
ctx.restore();
}
}
class Player {
constructor(x, y, size, color, inputManager) {
this.x = x;
this.y = y;
this.velX = 0;
this.velY = 0;
this.size = size;
this.color = color;
this.input = inputManager;
}
update() {
this.velX *= 0.9;
this.velY *= 0.9;
if (this.input.isKeyDown("up")) {
this.velY -= 0.1;
}
if (this.input.isKeyDown("down")) {
this.velY += 0.1;
}
if (this.input.isKeyDown("left")) {
this.velX -= 0.1;
}
if (this.input.isKeyDown("right")) {
this.velX += 0.1;
}
this.velX = clamp(this.velX, -5, 5);
this.velY = clamp(this.velY, -5, 5);
this.x += this.velX;
this.y += this.velY;
}
draw(ctx) {
ctx.save();
ctx.fillStyle = this.color;
ctx.fillRect(this.x, this.y, this.size, this.size);
ctx.restore();
}
}
var canvas = document.getElementById("game");
var ctx = canvas.getContext("2d");
var input = new InputManager();
var game = {
init: function(canvas, ctx, input) {
this.canvas = canvas;
this.canvas.width = Math.floor(400 * 0.5);
this.canvas.height = Math.floor(500 * 0.5);
this.ctx = ctx;
this.input = input;
this.ctx.imageSmoothingEnabled = false;
this.ctx.mozImageSmoothingEnabled = false;
this.ctx.msImageSmoothingEnabled = false;
this.world = new World(this.canvas, this.ctx, this.input);
return true;
},
update: function() {
this.world.update();
if (this.world.gameOver) {
if (this.input.isKeyDown("enter")) {
this.world.resetWorld();
}
}
},
draw: function() {
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
this.world.draw(this.ctx);
this.ctx.save();
this.ctx.fillStyle = "#540B0E";
this.ctx.fillRect(0, 0, this.canvas.width, 16);
this.ctx.restore();
// Draw game over text if game is over
if (this.world.gameOver) {
ctx.save();
ctx.fillStyle = "#FFF3B0";
ctx.font = "26px arial";
ctx.fillText("GAME OVER", (this.canvas.width * 0.5) - (ctx.measureText("GAME OVER").width * 0.5), this.canvas.height * 0.5);
let strScore = "YOU SURVIVED " + this.world.score + " SECONDS";
ctx.font = "10px arial";
ctx.fillText(strScore, (this.canvas.width * 0.5) - (ctx.measureText(strScore).width * 0.5), this.canvas.height * 0.6);
ctx.restore();
}
else {
// Draw score
ctx.save();
ctx.fillStyle = "#FFF3B0";
ctx.font = "10px arial";
ctx.fillText(this.world.score + " SECONDS", 10, 12);
ctx.restore();
}
}
}
if (game.init(canvas, ctx, input)) {
function mainloop() {
game.update();
game.draw(ctx);
window.requestAnimationFrame(mainloop);
}
mainloop();
}
window.addEventListener("keydown", function(e) {
var keyCode = e.which || e.keyCode || 0;
input.setKeyDown(keyCode);
});
window.addEventListener("keyup", function(e) {
var keyCode = e.which || e.keyCode || 0;
input.setKeyUp(keyCode);
})
</script>
</body>
</html>