canvas-ellipse-zero-lineto.html | Explore in Territory

<html>
<head><body>
<canvas id="mycanvas" width="400" height="400"></canvas>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(function(t) {
    var canvas = document.getElementById('mycanvas');
    var ctx = canvas.getContext('2d');
    
    var zero = 0;
    ctx.lineWidth = 5;
    ctx.fillStyle = 'rgb(255, 255, 255)';
    ctx.strokeStyle = 'rgb(0, 0, 0)';
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    
    var imageData = ctx.getImageData(1, 1, 1, 1);
    var data = imageData.data;
    assert_equals(imageData.data[1], 255);
    
    ctx.save();
    // moveTo + empty ellipse (swing == 0)
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.moveTo(20, 0);
    ctx.ellipse(80, 0, 10, 20, Math.PI / 6, -Math.PI / 2, -Math.PI / 2 + zero, false);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(23, 29, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(85, 14, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // moveTo + empty ellipse (radiusX == 0)
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.moveTo(20, 0);
    ctx.ellipse(80, 0, zero, 20, Math.PI / 6, -Math.PI / 2, Math.PI / 2, false);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(22, 60, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(86, 43, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(71, 73, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // moveTo + empty ellipse (radiusY == 0)
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.moveTo(20, 0);
    ctx.ellipse(80, 0, 10, zero, Math.PI / 6, -Math.PI / 2, Math.PI / 2, false);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(22, 90, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(79, 90, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(87, 94, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // empty ellipse (swing == 0) + lineTo
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.ellipse(20, 0, 10, 20, Math.PI / 6, -Math.PI / 2, -Math.PI / 2 + zero, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(26, 101, 1, 1);
    assert_equals(imageData.data[1], 255);
    imageData = ctx.getImageData(32, 103, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(77, 119, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // empty ellipse (radiusX == 0) + lineTo
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.ellipse(20, 0, zero, 20, Math.PI / 6, -Math.PI / 2, Math.PI / 2, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(28, 135, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(11, 166, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(76, 151, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // empty ellipse (radiusY == 0) + lineTo
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.ellipse(20, 0, 10, zero, Math.PI / 6, -Math.PI / 2, Math.PI / 2, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(27, 183, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(21, 179, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(77, 180, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    ctx.restore();
    
    ctx.translate(100, 0);
    ctx.save();
    // lineTo + empty ellipse (radiusX == 0) + lineTo
    // 1. sweepAngle < PI / 2
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, zero, 20, Math.PI / 6, -Math.PI / 4, Math.PI / 4, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(110, 29, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(122, 22, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(113, 42, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(144, 38, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // 2. sweepAngle < PI
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, zero, 20, Math.PI / 6, -Math.PI / 4, Math.PI / 2, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(122, 54, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(112, 76, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(142, 70, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // 3. sweepAngle < 2PI
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, zero, 20, Math.PI / 6, -Math.PI / 4, Math.PI * 3 / 2, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(115, 86, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(110, 104, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(138, 77, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // 4. sweepAngle < 4PI
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, zero, 20, Math.PI / 6, -Math.PI / 4, Math.PI * 2, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(115, 116, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(111, 136, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(127, 106, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(127, 121, 1, 1);
    assert_equals(imageData.data[1], 255);
    
    // 5. sweepAngle > 4PI
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, zero, 20, Math.PI / 6, -Math.PI / 4, Math.PI * 16, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(115, 146, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(111, 166, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(127, 136, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(127, 151, 1, 1);
    assert_equals(imageData.data[1], 255);
    
    ctx.restore();
    
    ctx.translate(100, 0);
    ctx.save();
    // lineTo + empty ellipse (radiusY == 0) + lineTo
    // 1. sweepAngle < PI / 2
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, 20, zero, Math.PI / 6, -Math.PI / 4, Math.PI / 4, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(213, 32, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(234, 39, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(240, 36, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // 2. sweepAngle < PI
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, 20, zero, Math.PI / 6, -Math.PI / 4, Math.PI / 2, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(232, 69, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(238, 72, 1, 1);
    assert_equals(imageData.data[1], 255);
    imageData = ctx.getImageData(228, 65, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(242, 61, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // 3. sweepAngle < 2PI
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, 20, zero, Math.PI / 6, -Math.PI / 4, Math.PI * 3 / 2, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(204, 82, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(234, 100, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(212, 92, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(240, 90, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // 4. sweepAngle < 4PI
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, 20, zero, Math.PI / 6, -Math.PI / 4, Math.PI * 2, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(208, 114, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(235, 130, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(210, 120, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(252, 124, 1, 1);
    assert_equals(imageData.data[1], 0);
    
    // 5. sweepAngle > 4PI
    ctx.translate(0, 30);
    ctx.save();
    ctx.beginPath();
    ctx.lineTo(10, 0);
    ctx.ellipse(20, 0, 20, zero, Math.PI / 6, -Math.PI / 4, Math.PI * 16, false);
    ctx.lineTo(80, 0);
    ctx.stroke();
    ctx.restore();
    
    imageData = ctx.getImageData(208, 144, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(235, 160, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(210, 150, 1, 1);
    assert_equals(imageData.data[1], 0);
    imageData = ctx.getImageData(252, 154, 1, 1);
    assert_equals(imageData.data[1], 0);    
}, 'This tests checks that ellipse can draw lines correctly in edge cases.');
</script>
</body>
</html>
chromium/third_party/blink/web_tests/fast/canvas/canvas-ellipse-zero-lineto.html
