<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Gamedev Canvas Workshop - lesson 2: move the ball</title>
<style>* { padding: 0; margin: 0; } canvas { background: #000000; display: block; margin: 0 auto; }</style>
</head>
<body>
<canvas id="myCanvas" width="480" height="320"></canvas>
<script>
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var x = canvas.width/2;
var y = canvas.height-30;
var dx = 5; (可控制球飛的方向)
var dy = 3;
function drawBall() {
ctx.beginPath();
ctx.arc(x, y, 10, 0, Math.PI*2);
ctx.fillStyle = "#FFB7DD";
ctx.fill();
ctx.closePath();
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
drawBall();
x += dx; (可控制球的速度參數)
y += dy;
}
setInterval(draw, 10);
</script>
</body>
</html>
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課程2:
這次的課程主要是控制球飛的方向，以及球飛的速度!!!
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