174 lines
4.5 KiB
HTML
174 lines
4.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<head>
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<script src="../../resources/js-test-pre.js"></script>
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</head>
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<body>
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<script>
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description("Ensure correct behavior of canvas with strokePath using a gradient strokeStyle and a shadow");
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function print(message, color)
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{
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var paragraph = document.createElement("div");
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paragraph.appendChild(document.createTextNode(message));
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paragraph.style.fontFamily = "monospace";
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if (color)
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paragraph.style.color = color;
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document.getElementById("console").appendChild(paragraph);
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}
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function shouldBeAround(a, b)
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{
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var evalA;
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try {
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evalA = eval(a);
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} catch(e) {
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evalA = e;
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}
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if (Math.abs(evalA - b) < 15)
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print("PASS " + a + " is around " + b , "green")
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else
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print("FAIL " + a + " is not around " + b + " (actual: " + evalA + ")", "red");
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}
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var canvas = document.createElement('canvas');
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document.body.appendChild(canvas);
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canvas.setAttribute('width', '600');
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canvas.setAttribute('height', '1100');
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var ctx = canvas.getContext('2d');
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var gradient = ctx.createLinearGradient(0, 0, 300, 0);
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gradient.addColorStop(0, 'rgba(0, 0, 255, 0.5)');
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gradient.addColorStop(1, 'rgba(0, 0, 255, 0.5)');
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ctx.save();
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ctx.strokeStyle = gradient;
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ctx.shadowColor = 'rgba(255, 0, 0, 0.5)';
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ctx.shadowOffsetX = 250;
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ctx.lineWidth = 25;
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var side = 200;
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// Alpha shadow.
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ctx.shadowBlur = 0;
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ctx.beginPath();
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ctx.rect(50, 50, side, side);
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ctx.stroke();
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// Blurry shadow.
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ctx.shadowBlur = 10;
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ctx.beginPath();
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ctx.rect(50, 300, side, side);
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ctx.stroke();
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ctx.rotate(Math.PI / 2);
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// Rotated alpha shadow.
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ctx.shadowBlur = 0;
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ctx.beginPath();
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ctx.rect(550, -250, side, side);
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ctx.stroke();
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// Rotated blurry shadow.
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ctx.shadowBlur = 10;
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ctx.beginPath();
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ctx.rect(800, -250, side, side);
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ctx.stroke();
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ctx.restore();
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var imageData, data;
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ctx.fillStyle = 'black';
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function test(alphaTestFunction, x, y, r, g, b, a) {
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// Get pixel.
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imageData = ctx.getImageData(x, y, 1, 1);
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data = imageData.data;
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// Test pixel color components.
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shouldBe('data[0]', r+'');
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shouldBe('data[1]', g+'');
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shouldBe('data[2]', b+'');
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alphaTestFunction('data[3]', a+'');
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// Plot test point.
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ctx.fillRect(x, y, 3, 3);
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}
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print('Verifying alpha shadow...');
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test(shouldBe, 400, 150, 0, 0, 0, 0);
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test(shouldBe, 400, 75, 0, 0, 0, 0);
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test(shouldBe, 400, 225, 0, 0, 0, 0);
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test(shouldBe, 325, 150, 0, 0, 0, 0);
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test(shouldBe, 475, 150, 0, 0, 0, 0);
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test(shouldBeAround, 400, 50, 255, 0, 0, 64);
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test(shouldBeAround, 500, 150, 255, 0, 0, 64);
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test(shouldBeAround, 400, 250, 255, 0, 0, 64);
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test(shouldBeAround, 300, 150, 255, 0, 0, 64);
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test(shouldBe, 400, 25, 0, 0, 0, 0);
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test(shouldBe, 525, 150, 0, 0, 0, 0);
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test(shouldBe, 400, 275, 0, 0, 0, 0);
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test(shouldBe, 275, 150, 0, 0, 0, 0);
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print(' ');
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print('Verifying blurry shadow...');
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test(shouldBe, 400, 400, 0, 0, 0, 0);
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test(shouldBe, 400, 325, 0, 0, 0, 0);
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test(shouldBe, 475, 400, 0, 0, 0, 0);
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test(shouldBe, 400, 475, 0, 0, 0, 0);
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test(shouldBe, 325, 400, 0, 0, 0, 0);
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test(shouldBeAround, 400, 300, 255, 0, 0, 64);
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test(shouldBeAround, 400, 500, 255, 0, 0, 64);
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test(shouldBeAround, 300, 400, 255, 0, 0, 64);
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test(shouldBeAround, 500, 400, 255, 0, 0, 64);
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test(shouldBe, 525, 400, 0, 0, 0, 0);
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test(shouldBe, 275, 400, 0, 0, 0, 0);
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print(' ');
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print('Verifying rotated alpha shadow...');
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test(shouldBe, 400, 650, 0, 0, 0, 0);
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test(shouldBe, 400, 575, 0, 0, 0, 0);
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test(shouldBe, 400, 725, 0, 0, 0, 0);
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test(shouldBe, 325, 650, 0, 0, 0, 0);
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test(shouldBe, 475, 650, 0, 0, 0, 0);
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test(shouldBeAround, 400, 550, 255, 0, 0, 64);
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test(shouldBeAround, 500, 650, 255, 0, 0, 64);
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test(shouldBeAround, 400, 750, 255, 0, 0, 64);
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test(shouldBeAround, 300, 650, 255, 0, 0, 64);
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test(shouldBe, 400, 525, 0, 0, 0, 0);
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test(shouldBe, 525, 650, 0, 0, 0, 0);
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test(shouldBe, 400, 775, 0, 0, 0, 0);
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test(shouldBe, 275, 650, 0, 0, 0, 0);
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print(' ');
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print('Verifying rotated blurry shadow...');
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test(shouldBe, 400, 900, 0, 0, 0, 0);
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test(shouldBe, 400, 825, 0, 0, 0, 0);
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test(shouldBe, 475, 900, 0, 0, 0, 0);
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test(shouldBe, 400, 975, 0, 0, 0, 0);
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test(shouldBe, 325, 900, 0, 0, 0, 0);
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test(shouldBeAround, 400, 800, 255, 0, 0, 64);
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test(shouldBeAround, 400, 1000, 255, 0, 0, 64);
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test(shouldBeAround, 300, 900, 255, 0, 0, 64);
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test(shouldBeAround, 500, 900, 255, 0, 0, 64);
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test(shouldBe, 525, 900, 0, 0, 0, 0);
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test(shouldBe, 275, 900, 0, 0, 0, 0);
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test(shouldBe, 400, 1025, 0, 0, 0, 0);
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print(' ');
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</script>
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<script src="../../resources/js-test-post.js"></script>
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</body>
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</html>
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