HTML Platformer Game Code: Create Your Own 2D Adventure
<!DOCTYPE html>
<html>
<head>
<title>My Platformer Game</title>
<style type="text/css">
body {
margin: 0;
padding: 0;
}
<pre><code>canvas {
background: #eee;
display: block;
margin: 0 auto;
}
</code></pre>
</style>
</head>
<body>
<canvas id="gameCanvas" width="480" height="320"></canvas>
<script>
//Create the canvas
var canvas = document.getElementById("gameCanvas");
var ctx = canvas.getContext("2d");
<pre><code>//Background image
var bgReady = false;
var bgImage = new Image();
bgImage.onload = function () {
bgReady = true;
};
bgImage.src = "images/background.png";
//Game objects
var hero = {
speed: 256 // movement in pixels per second
};
var heroReady = false;
var heroImage = new Image();
heroImage.onload = function () {
heroReady = true;
};
heroImage.src = "images/hero.png";
//Handle keyboard controls
var keysDown = {};
addEventListener("keydown", function (e) {
keysDown[e.keyCode] = true;
}, false);
addEventListener("keyup", function (e) {
delete keysDown[e.keyCode];
}, false);
//Update game objects
var update = function (modifier) {
if (38 in keysDown) { // Player holding up
hero.y -= hero.speed * modifier;
}
if (40 in keysDown) { // Player holding down
hero.y += hero.speed * modifier;
}
if (37 in keysDown) { // Player holding left
hero.x -= hero.speed * modifier;
}
if (39 in keysDown) { // Player holding right
hero.x += hero.speed * modifier;
}
};
//Draw everything
var render = function () {
if (bgReady) {
ctx.drawImage(bgImage, 0, 0);
}
if (heroReady) {
ctx.drawImage(heroImage, hero.x, hero.y);
}
};
//Game loop
var main = function () {
var now = Date.now();
var delta = now - then;
update(delta / 1000);
render();
then = now;
// Request to do this again ASAP
requestAnimationFrame(main);
};
//Cross-browser support for requestAnimationFrame
var w = window;
requestAnimationFrame = w.requestAnimationFrame || w.webkitRequestAnimationFrame || w.msRequestAnimationFrame || w.mozRequestAnimationFrame;
//Let's play this game!
var then = Date.now();
reset();
main();
</code></pre>
</script>
</body>
</html>
原文地址: https://www.cveoy.top/t/topic/lnRS 著作权归作者所有。请勿转载和采集!