Gamedev Canvas Workshop - lesson 2

Move the ball.

by Zecheng Hu

HTML

<canvas id="myCanvas" width="480" height="320"></canvas>

CSS

canvas { background: #eee; }

JavaScript

var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var x = canvas.width/1;
var y = canvas.height-3;
var dx = -0.75;
var dy = -1.5;

function drawBall() {
    ctx.beginPath();
    ctx.arc(x, y, 10, 0, Math.PI*2);
    ctx.fillStyle = "#00FFB6";
    ctx.fill();
    ctx.closePath();
}

function draw() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    drawBall();
    x += dx;
    y += dy;
}

setInterval(draw, 0);