November 2011
Intermediate to advanced
348 pages
7h 2m
English
Content preview from HTML5 Canvas Cookbook
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Creating patterns with loops: drawing a gear
In this recipe, we'll create a mechanical gear by iteratively drawing a radial zigzag to form teeth and then drawing circles to form the body of the gear.
How to do it...
Follow these steps to draw a gear centered on the canvas:
- Define a 2D canvas context and set the gear properties:
window.onload = function(){ var canvas = document.getElementById("myCanvas"); var context = canvas.getContext("2d"); // gear position var centerX = canvas.width / 2; var centerY = canvas.height / 2; // radius of the teeth tips var outerRadius = 95; // radius of the teeth intersections var innerRadius = 50; // radius of the gear ...
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