experimental/pathkit/tests/path.spec.js

describe('PathKit\'s Path 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('dynamically updates getBounds()', function(done){
        LoadPathKit.then(() => {
            // Based on test_bounds_crbug_513799
            let path = PathKit.NewPath();
            expect(path.getBounds()).toEqual(PathKit.MakeLTRBRect(0, 0, 0, 0));
            path.moveTo(-5, -8);
            expect(path.getBounds()).toEqual(PathKit.MakeLTRBRect(-5, -8, -5, -8));
            path.rect(1, 2, 2, 2);
            expect(path.getBounds()).toEqual(PathKit.MakeLTRBRect(-5, -8, 3, 4));
            path.moveTo(1, 2);
            expect(path.getBounds()).toEqual(PathKit.MakeLTRBRect(-5, -8, 3, 4));
            path.delete();
            done();
        });
    });

    function bits2float(str) {
        return PathKit.SkBits2FloatUnsigned(parseInt(str))
    }

    it('has getBounds() and computeTightBounds()', function(done){
        LoadPathKit.then(() => {
            // Based on PathOpsTightBoundsIllBehaved
            let path = PathKit.NewPath();
            path.moveTo(1, 1);
            path.quadraticCurveTo(4, 3, 2, 2);
            expect(path.getBounds()).toEqual(PathKit.MakeLTRBRect(1, 1, 4, 3));
            expect(path.computeTightBounds()).toEqual(PathKit.MakeLTRBRect(1, 1,
                        bits2float("0x40333334"),  // 2.8
                        bits2float("0x40155556"))); // 2.3333333
            path.delete();

            done();
        });
    });

    it('does NOT approximates conics when dumping as toCmds', function(done){
        LoadPathKit.then(() => {
            let path = PathKit.NewPath();
            path.moveTo(20, 120);
            path.arc(20, 120, 18, 0, 1.75 * Math.PI);
            path.lineTo(20, 120);

            let expectedCmds = [
                [PathKit.MOVE_VERB, 20, 120],
                [PathKit.LINE_VERB, 38, 120],
                [PathKit.CONIC_VERB, 38, 138, 20, 138, bits2float("0x3f3504f3)")], // 0.707107f
                [PathKit.CONIC_VERB, 2, 138, 2, 120, bits2float("0x3f3504f3)")],   // 0.707107f
                [PathKit.CONIC_VERB, 2, 102, 20, 102, bits2float("0x3f3504f3)")],  // 0.707107f
                [PathKit.CONIC_VERB, bits2float("0x41dba58e"), 102, bits2float("0x4202e962"), bits2float("0x42d68b4d"), bits2float("0x3f6c8361")],  // 27.4558, 102, 32.7279, 107.272, 0.92388
                [PathKit.LINE_VERB, 20, 120],
            ];
            let actual = path.toCmds();
            expect(actual).toEqual(expectedCmds);

            path.delete();
            done();
        });
    });

});