canvas-modify-emptyPath.html | Explore in Territory

<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<body>
<script>

function getColor(x,y) {
    return ctx.getImageData(x, y, 1, 1).data;
}

var canvas = document.createElement('canvas');
canvas.width = 300;
canvas.height = 300;
var ctx = canvas.getContext('2d');

// Test no drawing cases
ctx.fillStyle = 'green';
ctx.strokeStyle = 'red';
ctx.lineWidth = 50;


test(function(t) {
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    ctx.lineTo(50, 50);
    ctx.stroke();
    assert_array_equals(getColor(40,40), [0,128,0,255]);
    ctx.clearRect(0, 0, 300, 300);
    
    // Test when create rectangle path using a rectangle with width = height = 0.
    
    ctx.strokeStyle = 'red';
    ctx.lineWidth = 10;
    ctx.beginPath();
    ctx.rect(0, 0, 0, 0);
    ctx.stroke();
    assert_array_equals(getColor(1,1), [0,0,0,0]);
    ctx.clearRect(0, 0, 300, 300);
    
    // Test path modifications that result in drawing
    ctx.fillStyle = 'red';
    ctx.strokeStyle = 'green';
    
    
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    ctx.lineTo(0, 50);
    ctx.lineTo(100, 50);
    ctx.stroke();
    assert_array_equals(getColor(0,0), [255,0,0,255]);
    assert_array_equals(getColor(50,50), [0,128,0,255]);
    ctx.clearRect(0, 0, 300, 300);
    
    
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    ctx.quadraticCurveTo(0, 50, 100, 50);
    ctx.stroke();
    assert_array_equals(getColor(10,10), [255,0,0,255]);
    assert_array_equals(getColor(50,50), [0,128,0,255]);
    ctx.clearRect(0, 0, 300, 300);
    
    
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    ctx.quadraticCurveTo(0, 50, 100, 50);
    ctx.lineTo(50, 100);
    ctx.stroke();
    assert_array_equals(getColor(10,10), [255,0,0,255]);
    assert_array_equals(getColor(99,51), [0,128,0,255]);
    assert_array_equals(getColor(50,50), [0,128,0,255]);
    ctx.clearRect(0, 0, 300, 300);
    
    
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    ctx.bezierCurveTo(0, 50, 50, 50, 100, 50);
    ctx.stroke();
    assert_array_equals(getColor(10,10), [255,0,0,255]);
    assert_array_equals(getColor(50,50), [0,128,0,255]);
    ctx.clearRect(0, 0, 300, 300);
    
    
    ctx.beginPath();
    ctx.fillRect(0, 0, 100, 100);
    ctx.bezierCurveTo(0, 50, 50, 50, 100, 50);
    ctx.stroke();
    ctx.lineTo(50, 100);
    ctx.stroke();
    assert_array_equals(getColor(10,10), [255,0,0,255]);
    assert_array_equals(getColor(99,51), [0,128,0,255]);
    assert_array_equals(getColor(50,50), [0,128,0,255]);
    ctx.clearRect(0, 0, 300, 300);
    
}, "This tests behaviour of path modification APIs on an empty path.");
</script>
</body>
chromium/third_party/blink/web_tests/fast/canvas/canvas-modify-emptyPath.html
