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103 lines
2.7 KiB
103 lines
2.7 KiB
<!DOCTYPE html>
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<html>
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<head>
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<title>MDN Canvas Tutorial</title>
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<style type="text/css">
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canvas {
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border: 1px solid black;
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}
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</style>
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</head>
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<body>
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<canvas id="tut0" width="150" height="150"></canvas>
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<canvas id="tut1" width="150" height="150"></canvas>
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<canvas id="tut2" width="150" height="150"></canvas>
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<canvas id="tut3" width="150" height="150"></canvas>
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<canvas id="tut4" width="150" height="200"></canvas>
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<script type="text/javascript">
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var drawings = {};
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drawings.draw0 = function () {
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var ctx = document.getElementById('tut0').getContext('2d');
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ctx.fillStyle = 'rgb(200, 0, 0)';
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ctx.fillRect(10, 10, 55, 50);
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ctx.fillStyle = 'rgba(0, 0, 200, 0.5)';
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ctx.fillRect(30, 30, 55, 50);
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};
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drawings.draw1 = function() {
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var ctx = document.getElementById('tut1').getContext('2d');
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ctx.fillRect(25, 25, 100, 100);
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ctx.clearRect(45, 45, 60, 60);
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ctx.strokeRect(50, 50, 50, 50);
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};
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drawings.draw2 = function() {
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var ctx = document.getElementById('tut2').getContext('2d');
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ctx.beginPath();
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ctx.arc(75, 75, 50, 0, Math.PI*2, true);
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ctx.moveTo(110, 75);
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ctx.arc(75, 75, 35, 0, Math.PI, false);
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ctx.moveTo(65, 65);
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ctx.arc(60, 65, 5, 0, Math.PI*2, true);
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ctx.moveTo(95, 65);
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ctx.arc(90, 65, 5, 0, Math.PI*2, true);
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ctx.stroke();
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};
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drawings.draw3 = function() {
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var ctx = document.getElementById('tut3').getContext('2d');
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ctx.beginPath();
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ctx.moveTo(25, 25);
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ctx.lineTo(105, 25);
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ctx.lineTo(25, 105);
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ctx.fill();
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ctx.beginPath();
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ctx.moveTo(125, 125);
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ctx.lineTo(125, 45);
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ctx.lineTo(45, 125);
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ctx.closePath();
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ctx.stroke();
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};
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drawings.draw4 = function() {
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var ctx = document.getElementById('tut4').getContext('2d');
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for(var i=0; i<4; i++) {
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for(var j=0; j<3; j++) {
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ctx.beginPath();
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var x = 25+j*50,
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y = 25+i*50,
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radius = 20,
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startAngle = 0,
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endAngle = Math.PI+(Math.PI*j)/2,
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anticlockwise = i%2==0 ? false : true;
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ctx.arc(x, y, radius, startAngle, endAngle, anticlockwise);
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if (i > 1) {
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ctx.fill();
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} else {
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ctx.stroke();
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}
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}
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}
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};
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window.addEventListener('load', function() {
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for(funcname in drawings) {
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console.log("Calling %s", funcname);
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drawings[funcname]();
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}
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}, false);
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</script>
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</body>
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</html>
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