skia2/modules/pathkit/tests/util.spec.js
Kevin Lubick 774be5aa96 [PathKit] Add cubicYFromX
Docs-Preview: https://skia.org/?cl=152385
Bug: skia:8216
Change-Id: I0020e8d2d4e6e7c7de5c71ddf923a618659cde2c
Reviewed-on: https://skia-review.googlesource.com/152385
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
2018-09-07 18:01:40 +00:00

67 lines
2.2 KiB
JavaScript

// Tests for util-related things
describe('PathKit\'s CubicMap Behavior', function() {
// Note, don't try to print the PathKit object - it can cause Karma/Jasmine to lock up.
var PathKit = null;
const LoadPathKit = new Promise(function(resolve, reject) {
if (PathKit) {
resolve();
} else {
PathKitInit({
locateFile: (file) => '/pathkit/'+file,
}).then((_PathKit) => {
PathKit = _PathKit;
resolve();
});
}
});
it('computes YFromX correctly', function(done) {
LoadPathKit.then(() => {
// Spot check a few points
const testcases = [
// input x, expected y
[0.025391, 0.117627],
[0.333984, 0.276221],
[0.662109, 0.366052],
[0.939453, 0.643296],
];
for (tc of testcases) {
expect(PathKit.cubicYFromX(0, 0.5, 1.0, 0, tc[0])).toBeCloseTo(tc[1], 5);
}
done();
});
});
it('computes a point from T correctly', function(done) {
LoadPathKit.then(() => {
// Spot check a few points
const testcases = [
// input t, expected x, expected y
[0.25, [0.128125, 0.240625]],
[0.5, [0.35, 0.35]],
[0.75, [0.646875, 0.534375]],
[1.0, [1.0, 1.0]],
];
for (tc of testcases) {
let ans = PathKit.cubicPtFromT(0.1, 0.5, 0.5, 0.1, tc[0]);
expect(ans).toBeTruthy();
expect(ans.length).toBe(2);
expect(ans[0]).toBeCloseTo(tc[1][0]);
expect(ans[1]).toBeCloseTo(tc[1][1]);
}
done();
});
});
it('does not leak, with or without cache', function(done) {
LoadPathKit.then(() => {
// Run it a lot to make sure we don't leak.
for (let i = 0; i < 300000; i++) {
PathKit.cubicYFromX(0.1, 0.5, 0.5, 0.1, 0.1);
PathKit.cubicPtFromT(0.1, 0.5, 0.5, 0.1, 0.1);
}
done();
});
});
});