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53 lines
1.9 KiB
HTML
53 lines
1.9 KiB
HTML
5 years ago
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<!doctype html>
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<html>
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<head>
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<title>canvas.js | paths</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<script type="text/javascript" src="../../pattern/canvas.js"></script>
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</head>
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<body>
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<script type="text/canvas">
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function setup(canvas) {
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canvas.size(500, 500);
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}
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function draw(canvas) {
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canvas.clear();
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// A Bézier path can be used to draw complex shapes (e.g., curve, star, ...)
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// The BezierPath object has moveto(), lineto(), curveto() and close() methods.
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// moveto() and lineto() take two parameters: x, y.
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// curveto() takes six parameters: x1, y1, x2, y2, x3, y3,
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// where (x1,y1) describes the direction in which the curve starts,
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// and (x2,y2) describes the direction in which it ends in point (x3,y3).
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var x = canvas.mouse.x;
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var y = canvas.mouse.y;
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var p = new BezierPath();
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p.moveto(0, 0);
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p.curveto(100, 100, x, y, 200, 200);
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// drawpath() draws the given BezierPath.
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// Notice how we set fill and stroke as optional parameters.
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// You can do this with line(), rect(), ellipse() and text() too.
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drawpath(p, {fill:null, stroke:[0,0,0,1]});
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line(0, 0, 100, 100, {stroke:[0,0,0,0.5]}); // show handle (x1,y1)
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line(200, 200, x, y, {stroke:[0,0,0,0.5]}); // show handle (x2,y2)
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// Create a leaf shape.
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var leaf = new BezierPath();
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leaf.moveto(0, 0);
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leaf.curveto(50, 50, 0, 150, 0, 200);
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leaf.curveto(0, 150, -50, 50, 0, 0);
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// Actually, we should have done this in setup().
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// This way the path is calculated only once, instead of every frame.
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// Draw copies of the leaf to create a flower-shape.
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translate(250, 250);
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fill(0.25, 0.15, 0.75, 0.25) // transparent purple-blue
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stroke(0); // black
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strokewidth(0.25);
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// The Array.range() command generates an array of numbers.
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// This is handy to use in a loop:
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for (var i in Array.range(40)) {
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rotate(9);
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drawpath(leaf);
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}
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}
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</script>
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</body>
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</html>
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