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description("Series of tests to ensure clip() works with path and winding rule parameters.");
var ctx = document.getElementById('canvas').getContext('2d');
function pixelDataAtPoint() {
return ctx.getImageData(50, 50, 1, 1).data;
}
function checkResult(expectedColors, sigma) {
for (var i = 0; i < 4; i++)
shouldBeCloseTo("pixelDataAtPoint()[" + i + "]", expectedColors[i], sigma);
}
function drawRectanglesOn(contextOrPath) {
contextOrPath.rect(0, 0, 100, 100);
contextOrPath.rect(25, 25, 50, 50);
}
function formatName(fillRule, path) {
return 'clip(' + (path ? 'path' : '') + (fillRule && path ? ', ' : '') +
(fillRule ? '"' + fillRule + '"' : '') + ')';
}
function testClipWith(fillRule, path) {
debug('Testing ' + formatName(fillRule, path));
ctx.fillStyle = 'rgb(255,0,0)';
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
ctx.fillStyle = 'rgb(0,255,0)';
if (path) {
if (fillRule) {
ctx.clip(path, fillRule);
} else {
ctx.clip(path);
}
} else {
ctx.beginPath();
drawRectanglesOn(ctx);
if (fillRule) {
ctx.clip(fillRule);
} else {
ctx.clip();
}
}
ctx.beginPath();
ctx.fillRect(0, 0, 100, 100);
if (fillRule == 'evenodd') {
checkResult([255, 0, 0, 255], 5);
} else {
checkResult([0, 255, 0, 255], 5);
}
debug('');
}
// Execute test.
function prepareTestScenario() {
fillRules = [undefined, 'nonzero', 'evenodd'];
path = new Path2D();
drawRectanglesOn(path);
for (var i = 0; i < fillRules.length; i++) {
testClipWith(fillRules[i]);
testClipWith(fillRules[i], path);
}
// Test exception cases.
shouldThrow("ctx.clip(null)");
shouldThrow("ctx.clip(null, null)");
shouldThrow("ctx.clip(null, 'nonzero')");
shouldThrow("ctx.clip(path, null)");
shouldThrow("ctx.clip([], 'nonzero')");
shouldThrow("ctx.clip({}, 'nonzero')");
shouldThrow("ctx.clip(null, 'evenodd')");
shouldThrow("ctx.clip([], 'evenodd')");
shouldThrow("ctx.clip({}, 'evenodd')");
shouldThrow("ctx.clip('gazonk')");
shouldThrow("ctx.clip(path, 'gazonk')");
shouldThrow("ctx.clip(undefined, undefined)");
shouldThrow("ctx.clip(undefined, 'nonzero')");
}
// Run test and allow variation of results.
prepareTestScenario();
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