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skia2/modules/canvaskit/tests/canvas.spec.js
Nathaniel Nifong 00de91c591 Add markCTM to canvaskit API, use in 3D cube example 
Change-Id: Id0eafdf0fd69f080e26e2bee5c7b38eb55b6a5c0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/287897
Commit-Queue: Nathaniel Nifong <nifong@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
2020-05-06 21:10:34 +00:00

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describe('Canvas Behavior', () => {
let container;
beforeEach(async () => {
await LoadCanvasKit;
container = document.createElement('div');
container.innerHTML = `
<canvas width=600 height=600 id=test></canvas>
<canvas width=600 height=600 id=report></canvas>`;
document.body.appendChild(container);
});
afterEach(() => {
document.body.removeChild(container);
});
gm('canvas_api_example', (canvas) => {
const paint = new CanvasKit.SkPaint();
paint.setStrokeWidth(2.0);
paint.setAntiAlias(true);
paint.setColor(CanvasKit.Color(0, 0, 0, 1.0));
paint.setStyle(CanvasKit.PaintStyle.Stroke);
canvas.drawLine(3, 10, 30, 15, paint);
canvas.drawRoundRect(CanvasKit.LTRBRect(5, 35, 45, 80), 15, 10, paint);
canvas.drawOval(CanvasKit.LTRBRect(5, 35, 45, 80), paint);
canvas.drawArc(CanvasKit.LTRBRect(55, 35, 95, 80), 15, 270, true, paint);
const font = new CanvasKit.SkFont(null, 20);
canvas.drawText('this is ascii text', 5, 100, paint, font);
const blob = CanvasKit.SkTextBlob.MakeFromText('Unicode chars 💩 é É ص', font);
canvas.drawTextBlob(blob, 5, 130, paint);
font.delete();
blob.delete();
paint.delete();
// See canvas2d for more API tests
});
gm('effect_and_text_example', (canvas) => {
const path = starPath(CanvasKit);
const paint = new CanvasKit.SkPaint();
const textPaint = new CanvasKit.SkPaint();
textPaint.setColor(CanvasKit.Color(40, 0, 0, 1.0));
textPaint.setAntiAlias(true);
const textFont = new CanvasKit.SkFont(null, 30);
const dpe = CanvasKit.SkPathEffect.MakeDash([15, 5, 5, 10], 1);
paint.setPathEffect(dpe);
paint.setStyle(CanvasKit.PaintStyle.Stroke);
paint.setStrokeWidth(5.0);
paint.setAntiAlias(true);
paint.setColor(CanvasKit.Color(66, 129, 164, 1.0));
canvas.clear(CanvasKit.Color(255, 255, 255, 1.0));
canvas.drawPath(path, paint);
canvas.drawText('This is text', 10, 280, textPaint, textFont);
dpe.delete();
path.delete();
paint.delete();
textFont.delete();
textPaint.delete();
});
gm('patheffects_canvas', (canvas) => {
canvas.clear(CanvasKit.WHITE);
const path = starPath(CanvasKit, 100, 100, 100);
const paint = new CanvasKit.SkPaint();
const cornerEffect = CanvasKit.SkPathEffect.MakeCorner(10);
const discreteEffect = CanvasKit.SkPathEffect.MakeDiscrete(5, 10, 0);
paint.setPathEffect(cornerEffect);
paint.setStyle(CanvasKit.PaintStyle.Stroke);
paint.setStrokeWidth(5.0);
paint.setAntiAlias(true);
paint.setColor(CanvasKit.Color(66, 129, 164, 1.0));
canvas.drawPath(path, paint);
canvas.translate(200, 0);
paint.setPathEffect(discreteEffect);
canvas.drawPath(path, paint);
cornerEffect.delete();
path.delete();
paint.delete();
});
it('returns the depth of the save state stack', () => {
const canvas = new CanvasKit.SkCanvas();
expect(canvas.getSaveCount()).toEqual(1);
canvas.save();
canvas.save();
canvas.restore();
canvas.save();
canvas.save();
expect(canvas.getSaveCount()).toEqual(4);
// does nothing, by the SkCanvas API
canvas.restoreToCount(500);
expect(canvas.getSaveCount()).toEqual(4);
canvas.restore();
expect(canvas.getSaveCount()).toEqual(3);
canvas.save();
canvas.restoreToCount(2);
expect(canvas.getSaveCount()).toEqual(2);
});
gm('circle_canvas', (canvas) => {
const path = starPath(CanvasKit);
const paint = new CanvasKit.SkPaint();
paint.setStyle(CanvasKit.PaintStyle.Stroke);
paint.setStrokeWidth(5.0);
paint.setAntiAlias(true);
paint.setColor(CanvasKit.CYAN);
canvas.clear(CanvasKit.WHITE);
canvas.drawCircle(30, 50, 15, paint);
paint.setStyle(CanvasKit.PaintStyle.Fill);
paint.setColor(CanvasKit.RED);
canvas.drawCircle(130, 80, 60, paint);
canvas.drawCircle(20, 150, 60, paint);
path.delete();
paint.delete();
});
gm('rrect_canvas', (canvas) => {
const path = starPath(CanvasKit);
const paint = new CanvasKit.SkPaint();
paint.setStyle(CanvasKit.PaintStyle.Stroke);
paint.setStrokeWidth(3.0);
paint.setAntiAlias(true);
paint.setColor(CanvasKit.BLACK);
canvas.clear(CanvasKit.WHITE);
canvas.drawRRect(CanvasKit.RRectXY(
CanvasKit.LTRBRect(10, 10, 50, 50), 5, 10), paint);
canvas.drawRRect(CanvasKit.RRectXY(
CanvasKit.LTRBRect(60, 10, 110, 50), 10, 5), paint);
canvas.drawRRect(CanvasKit.RRectXY(
CanvasKit.LTRBRect(10, 60, 210, 260), 0, 30), paint);
canvas.drawRRect(CanvasKit.RRectXY(
CanvasKit.LTRBRect(50, 90, 160, 210), 30, 30), paint);
path.delete();
paint.delete();
});
gm('rrect_8corners_canvas', (canvas) => {
const path = starPath(CanvasKit);
const paint = new CanvasKit.SkPaint();
paint.setStyle(CanvasKit.PaintStyle.Stroke);
paint.setStrokeWidth(3.0);
paint.setAntiAlias(true);
paint.setColor(CanvasKit.BLACK);
canvas.clear(CanvasKit.WHITE);
canvas.drawRRect({
rect: CanvasKit.LTRBRect(10, 10, 210, 210),
rx1: 10, // top left corner, going clockwise
ry1: 30,
rx2: 30,
ry2: 10,
rx3: 50,
ry3: 75,
rx4: 120,
ry4: 120,
}, paint);
path.delete();
paint.delete();
});
gm('drawDRRect_canvas', (canvas) => {
const path = starPath(CanvasKit);
const paint = new CanvasKit.SkPaint();
paint.setStyle(CanvasKit.PaintStyle.Fill);
paint.setStrokeWidth(3.0);
paint.setAntiAlias(true);
paint.setColor(CanvasKit.BLACK);
canvas.clear(CanvasKit.WHITE);
const outer = CanvasKit.RRectXY(CanvasKit.LTRBRect(10, 60, 210, 260), 10, 5);
const inner = CanvasKit.RRectXY(CanvasKit.LTRBRect(50, 90, 160, 210), 30, 30);
canvas.drawDRRect(outer, inner, paint);
path.delete();
paint.delete();
});
gm('colorfilters_canvas', (canvas) => {
const paint = new CanvasKit.SkPaint();
const blue = CanvasKit.SkColorFilter.MakeBlend(
CanvasKit.BLUE, CanvasKit.BlendMode.SrcIn);
const red = CanvasKit.SkColorFilter.MakeBlend(
CanvasKit.Color(255, 0, 0, 0.8), CanvasKit.BlendMode.SrcOver);
const lerp = CanvasKit.SkColorFilter.MakeLerp(0.6, red, blue);
paint.setStyle(CanvasKit.PaintStyle.Fill);
paint.setAntiAlias(true);
canvas.clear(CanvasKit.Color(230, 230, 230));
paint.setColorFilter(blue)
canvas.drawRect(CanvasKit.LTRBRect(10, 10, 60, 60), paint);
paint.setColorFilter(lerp)
canvas.drawRect(CanvasKit.LTRBRect(50, 10, 100, 60), paint);
paint.setColorFilter(red)
canvas.drawRect(CanvasKit.LTRBRect(90, 10, 140, 60), paint);
const r = CanvasKit.SkColorMatrix.rotated(0, .707, -.707);
const b = CanvasKit.SkColorMatrix.rotated(2, .5, .866);
const s = CanvasKit.SkColorMatrix.scaled(0.9, 1.5, 0.8, 0.8);
let cm = CanvasKit.SkColorMatrix.concat(r, s);
cm = CanvasKit.SkColorMatrix.concat(cm, b);
CanvasKit.SkColorMatrix.postTranslate(cm, 20, 0, -10, 0);
const mat = CanvasKit.SkColorFilter.MakeMatrix(cm);
const final = CanvasKit.SkColorFilter.MakeCompose(mat, lerp);
paint.setColorFilter(final)
canvas.drawRect(CanvasKit.LTRBRect(10, 70, 140, 120), paint);
paint.delete();
blue.delete();
red.delete();
lerp.delete();
final.delete();
});
gm('colorfilters_malloc_canvas', (canvas) => {
const paint = new CanvasKit.SkPaint();
const src = [
0.8, 0.45, 2, 0, 20,
0.53, -0.918, 0.566, 0, 0,
0.53, -0.918, -0.566, 0, -10,
0, 0, 0, 0.8, 0,
]
const cm = new CanvasKit.Malloc(Float32Array, 20);
for (i in src) {
cm[i] = src[i];
}
// MakeMatrix will free the malloc'd array when it is done with it.
const final = CanvasKit.SkColorFilter.MakeMatrix(cm);
paint.setColorFilter(final)
canvas.drawRect(CanvasKit.LTRBRect(10, 70, 140, 120), paint);
paint.delete();
final.delete();
});
gm('clips_canvas', (canvas) => {
const path = starPath(CanvasKit);
const paint = new CanvasKit.SkPaint();
paint.setColor(CanvasKit.BLUE);
const rrect = CanvasKit.RRectXY(CanvasKit.LTRBRect(300, 300, 500, 500), 40, 40);
canvas.save();
// draw magenta around the outside edge of an rrect.
canvas.clipRRect(rrect, CanvasKit.ClipOp.Difference, true);
canvas.drawColor(CanvasKit.Color(250, 30, 240, 0.9), CanvasKit.BlendMode.SrcOver);
canvas.restore();
// draw grey inside of a star pattern, then the blue star on top
canvas.clipPath(path, CanvasKit.ClipOp.Intersect, false);
canvas.drawColor(CanvasKit.Color(200, 200, 200, 1.0), CanvasKit.BlendMode.SrcOver);
canvas.drawPath(path, paint);
path.delete();
paint.delete();
});
// inspired by https://fiddle.skia.org/c/feb2a08bb09ede5309678d6a0ab3f981
gm('savelayer_rect_paint_canvas', (canvas) => {
canvas.clear(CanvasKit.WHITE);
const redPaint = new CanvasKit.SkPaint();
redPaint.setColor(CanvasKit.RED);
const solidBluePaint = new CanvasKit.SkPaint();
solidBluePaint.setColor(CanvasKit.BLUE);
const thirtyBluePaint = new CanvasKit.SkPaint();
thirtyBluePaint.setColor(CanvasKit.BLUE);
thirtyBluePaint.setAlphaf(0.3);
const alpha = new CanvasKit.SkPaint();
alpha.setAlphaf(0.3);
// Draw 4 solid red rectangles on the 0th layer.
canvas.drawRect(CanvasKit.LTRBRect(10, 10, 60, 60), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(150, 10, 200, 60), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(10, 70, 60, 120), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(150, 70, 200, 120), redPaint);
// Draw 2 blue rectangles that overlap. One is solid, the other
// is 30% transparent. We should see purple from the right one,
// the left one overlaps the red because it is opaque.
canvas.drawRect(CanvasKit.LTRBRect(30, 10, 80, 60), solidBluePaint);
canvas.drawRect(CanvasKit.LTRBRect(170, 10, 220, 60), thirtyBluePaint);
// Save a new layer. When the 1st layer gets merged onto the
// 0th layer (i.e. when restore() is called), it will use the provided
// paint to do so. The provided paint is set to have 30% opacity, but
// it could also have things set like blend modes or image filters.
// The rectangle is just a hint, so I've set it to be the area that
// we actually draw in before restore is called. It could also be omitted,
// see the test below.
canvas.saveLayer(CanvasKit.LTRBRect(10, 10, 220, 180), alpha);
// Draw the same blue overlapping rectangles as before. Notice in the
// final output, we have two different shades of purple instead of the
// solid blue overwriting the red. This proves the opacity was applied.
canvas.drawRect(CanvasKit.LTRBRect(30, 70, 80, 120), solidBluePaint);
canvas.drawRect(CanvasKit.LTRBRect(170, 70, 220, 120), thirtyBluePaint);
// We draw two more sets of overlapping red and blue rectangles. Notice
// the solid blue overwrites the red. This proves that the opacity from
// the alpha paint isn't available when the drawing happens - it only
// matters when restore() is called.
canvas.drawRect(CanvasKit.LTRBRect(10, 130, 60, 180), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(30, 130, 80, 180), solidBluePaint);
canvas.drawRect(CanvasKit.LTRBRect(150, 130, 200, 180), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(170, 130, 220, 180), thirtyBluePaint);
canvas.restore();
redPaint.delete();
solidBluePaint.delete();
thirtyBluePaint.delete();
alpha.delete();
});
// identical to the test above, except the save layer only has the paint, not
// the rectangle.
gm('savelayer_paint_canvas', (canvas) => {
canvas.clear(CanvasKit.WHITE);
const redPaint = new CanvasKit.SkPaint();
redPaint.setColor(CanvasKit.RED);
const solidBluePaint = new CanvasKit.SkPaint();
solidBluePaint.setColor(CanvasKit.BLUE);
const thirtyBluePaint = new CanvasKit.SkPaint();
thirtyBluePaint.setColor(CanvasKit.BLUE);
thirtyBluePaint.setAlphaf(0.3);
const alpha = new CanvasKit.SkPaint();
alpha.setAlphaf(0.3);
// Draw 4 solid red rectangles on the 0th layer.
canvas.drawRect(CanvasKit.LTRBRect(10, 10, 60, 60), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(150, 10, 200, 60), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(10, 70, 60, 120), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(150, 70, 200, 120), redPaint);
// Draw 2 blue rectangles that overlap. One is solid, the other
// is 30% transparent. We should see purple from the right one,
// the left one overlaps the red because it is opaque.
canvas.drawRect(CanvasKit.LTRBRect(30, 10, 80, 60), solidBluePaint);
canvas.drawRect(CanvasKit.LTRBRect(170, 10, 220, 60), thirtyBluePaint);
// Save a new layer. When the 1st layer gets merged onto the
// 0th layer (i.e. when restore() is called), it will use the provided
// paint to do so. The provided paint is set to have 30% opacity, but
// it could also have things set like blend modes or image filters.
canvas.saveLayer(alpha);
// Draw the same blue overlapping rectangles as before. Notice in the
// final output, we have two different shades of purple instead of the
// solid blue overwriting the red. This proves the opacity was applied.
canvas.drawRect(CanvasKit.LTRBRect(30, 70, 80, 120), solidBluePaint);
canvas.drawRect(CanvasKit.LTRBRect(170, 70, 220, 120), thirtyBluePaint);
// We draw two more sets of overlapping red and blue rectangles. Notice
// the solid blue overwrites the red. This proves that the opacity from
// the alpha paint isn't available when the drawing happens - it only
// matters when restore() is called.
canvas.drawRect(CanvasKit.LTRBRect(10, 130, 60, 180), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(30, 130, 80, 180), solidBluePaint);
canvas.drawRect(CanvasKit.LTRBRect(150, 130, 200, 180), redPaint);
canvas.drawRect(CanvasKit.LTRBRect(170, 130, 220, 180), thirtyBluePaint);
canvas.restore();
redPaint.delete();
solidBluePaint.delete();
thirtyBluePaint.delete();
alpha.delete();
});
gm('savelayerrec_canvas', (canvas) => {
// Note: fiddle.skia.org quietly draws a white background before doing
// other things, which is noticed in cases like this where we use saveLayer
// with the rec struct.
canvas.clear(CanvasKit.WHITE);
canvas.scale(8, 8);
const redPaint = new CanvasKit.SkPaint();
redPaint.setColor(CanvasKit.RED);
redPaint.setAntiAlias(true);
canvas.drawCircle(21, 21, 8, redPaint);
const bluePaint = new CanvasKit.SkPaint();
bluePaint.setColor(CanvasKit.BLUE);
canvas.drawCircle(31, 21, 8, bluePaint);
const blurIF = CanvasKit.SkImageFilter.MakeBlur(8, 0.2, CanvasKit.TileMode.Decal, null);
const count = canvas.saveLayer(null, blurIF, 0);
expect(count).toEqual(1);
canvas.scale(1/4, 1/4);
canvas.drawCircle(125, 85, 8, redPaint);
canvas.restore();
blurIF.delete();
redPaint.delete();
bluePaint.delete();
});
gm('drawpoints_canvas', (canvas) => {
const paint = new CanvasKit.SkPaint();
paint.setAntiAlias(true);
paint.setStyle(CanvasKit.PaintStyle.Stroke);
paint.setStrokeWidth(10);
paint.setColor(CanvasKit.Color(153, 204, 162, 0.82));
const points = [[32, 16], [48, 48], [16, 32]];
const caps = [CanvasKit.StrokeCap.Round, CanvasKit.StrokeCap.Square,
CanvasKit.StrokeCap.Butt];
const joins = [CanvasKit.StrokeJoin.Round, CanvasKit.StrokeJoin.Miter,
CanvasKit.StrokeJoin.Bevel];
const modes = [CanvasKit.PointMode.Points, CanvasKit.PointMode.Lines,
CanvasKit.PointMode.Polygon];
for (let i = 0; i < caps.length; i++) {
paint.setStrokeCap(caps[i]);
paint.setStrokeJoin(joins[i]);
for (const m of modes) {
canvas.drawPoints(m, points, paint);
canvas.translate(64, 0);
}
// Try with the malloc approach. Note that the drawPoints
// will free the pointer when done.
const mPoints = CanvasKit.Malloc(Float32Array, 3*2);
mPoints.set([32, 16, 48, 48, 16, 32]);
canvas.drawPoints(CanvasKit.PointMode.Polygon, mPoints, paint);
canvas.translate(-192, 64);
}
paint.delete();
});
gm('drawImageNine_canvas', (canvas, fetchedByteBuffers) => {
const img = CanvasKit.MakeImageFromEncoded(fetchedByteBuffers[0]);
expect(img).toBeTruthy();
canvas.clear(CanvasKit.WHITE);
const paint = new CanvasKit.SkPaint();
canvas.drawImageNine(img, {
fLeft: 40,
fTop: 40,
fRight: 400,
fBottom: 300,
}, CanvasKit.LTRBRect(5, 5, 300, 650), paint);
paint.delete();
img.delete();
}, '/assets/mandrill_512.png');
gm('drawvertices_canvas', (canvas) => {
const paint = new CanvasKit.SkPaint();
paint.setAntiAlias(true);
const points = [[ 0, 0 ], [ 250, 0 ], [ 100, 100 ], [ 0, 250 ]];
const colors = [CanvasKit.RED, CanvasKit.BLUE,
CanvasKit.YELLOW, CanvasKit.CYAN];
const vertices = CanvasKit.MakeSkVertices(CanvasKit.VertexMode.TriangleFan,
points, null /*textureCoordinates*/, colors, false /*isVolatile*/);
const bounds = vertices.bounds();
expect(bounds.fLeft).toEqual(0);
expect(bounds.fTop).toEqual(0);
expect(bounds.fRight).toEqual(250);
expect(bounds.fBottom).toEqual(250);
canvas.drawVertices(vertices, CanvasKit.BlendMode.Src, paint);
vertices.delete();
paint.delete();
});
gm('drawvertices_texture_canvas', (canvas, fetchedByteBuffers) => {
const img = CanvasKit.MakeImageFromEncoded(fetchedByteBuffers[0]);
const paint = new CanvasKit.SkPaint();
paint.setAntiAlias(true);
const points = [
[ 70, 170 ], [ 40, 90 ], [ 130, 150 ], [ 100, 50 ],
[ 225, 150 ], [ 225, 60 ], [ 310, 180 ], [ 330, 100 ]
];
const textureCoordinates = [
[ 0, 240 ], [ 0, 0 ], [ 80, 240 ], [ 80, 0 ],
[ 160, 240 ], [ 160, 0 ], [ 240, 240 ], [ 240, 0 ]
];
const vertices = CanvasKit.MakeSkVertices(CanvasKit.VertexMode.TrianglesStrip,
points, textureCoordinates, null /* colors */, false /*isVolatile*/);
const shader = img.makeShader(CanvasKit.TileMode.Repeat, CanvasKit.TileMode.Mirror);
paint.setShader(shader);
canvas.drawVertices(vertices, CanvasKit.BlendMode.Src, paint);
shader.delete();
vertices.delete();
paint.delete();
img.delete();
}, '/assets/brickwork-texture.jpg');
it('can change the 3x3 matrix on the canvas and read it back', () => {
const canvas = new CanvasKit.SkCanvas();
let matr = canvas.getTotalMatrix();
expect(matr).toEqual(CanvasKit.SkMatrix.identity());
canvas.concat(CanvasKit.SkMatrix.rotated(Math.PI/4));
const d = new DOMMatrix().translate(20, 10);
canvas.concat(d);
matr = canvas.getTotalMatrix();
const expected = CanvasKit.SkMatrix.multiply(
CanvasKit.SkMatrix.rotated(Math.PI/4),
CanvasKit.SkMatrix.translated(20, 10)
);
expect3x3MatricesToMatch(expected, matr);
});
const expect3x3MatricesToMatch = (expected, actual) => {
expect(expected.length).toEqual(9);
expect(actual.length).toEqual(9);
for (let i = 0; i < expected.length; i++) {
expect(expected[i]).toBeCloseTo(actual[i], 5);
}
};
const expect4x4MatricesToMatch = (expected, actual) => {
expect(expected.length).toEqual(16);
expect(actual.length).toEqual(16);
for (let i = 0; i < expected.length; i++) {
expect(expected[i]).toBeCloseTo(actual[i], 5);
}
};
it('can mark a CTM and retrieve it', () => {
const canvas = new CanvasKit.SkCanvas();
canvas.concat(CanvasKit.SkM44.rotated([0, 1, 0], Math.PI/4));
canvas.concat(CanvasKit.SkM44.rotated([1, 0, 1], Math.PI/8));
canvas.markCTM('krispykreme');
const expected = CanvasKit.SkM44.multiply(
CanvasKit.SkM44.rotated([0, 1, 0], Math.PI/4),
CanvasKit.SkM44.rotated([1, 0, 1], Math.PI/8),
);
expect4x4MatricesToMatch(expected, canvas.findMarkedCTM('krispykreme'));
});
it('returns null for an invalid CTM marker', () => {
const canvas = new CanvasKit.SkCanvas();
expect(canvas.findMarkedCTM('dunkindonuts')).toBeNull();
});
it('can change the 4x4 matrix on the canvas and read it back', () => {
const canvas = new CanvasKit.SkCanvas();
let matr = canvas.getLocalToDevice();
expect(matr).toEqual(CanvasKit.SkM44.identity());
canvas.concat(CanvasKit.SkM44.rotated([0, 1, 0], Math.PI/4));
canvas.concat(CanvasKit.SkM44.rotated([1, 0, 1], Math.PI/8));
const expected = CanvasKit.SkM44.multiply(
CanvasKit.SkM44.rotated([0, 1, 0], Math.PI/4),
CanvasKit.SkM44.rotated([1, 0, 1], Math.PI/8),
);
expect4x4MatricesToMatch(expected, canvas.getLocalToDevice());
// TODO(kjlubick) add test for DOMMatrix
// TODO(nifong) add more involved test for camera-related math.
});
gm('concat_with4x4_canvas', (canvas) => {
const path = starPath(CanvasKit, CANVAS_WIDTH/2, CANVAS_HEIGHT/2);
const paint = new CanvasKit.SkPaint();
paint.setAntiAlias(true);
canvas.clear(CanvasKit.WHITE);
// Rotate it a bit on all 3 major axis, centered on the screen.
// To play with rotations, see https://jsfiddle.skia.org/canvaskit/0525300405796aa87c3b84cc0d5748516fca0045d7d6d9c7840710ab771edcd4
const turn = CanvasKit.SkM44.multiply(
CanvasKit.SkM44.translated([CANVAS_WIDTH/2, 0, 0]),
CanvasKit.SkM44.rotated([1, 0, 0], Math.PI/3),
CanvasKit.SkM44.rotated([0, 1, 0], Math.PI/4),
CanvasKit.SkM44.rotated([0, 0, 1], Math.PI/16),
CanvasKit.SkM44.translated([-CANVAS_WIDTH/2, 0, 0]),
);
canvas.concat(turn);
// Draw some stripes to help the eye detect the turn
const stripeWidth = 10;
paint.setColor(CanvasKit.BLACK);
for (let i = 0; i < CANVAS_WIDTH; i += 2*stripeWidth) {
canvas.drawRect(CanvasKit.LTRBRect(i, 0, i + stripeWidth, CANVAS_HEIGHT), paint);
}
paint.setColor(CanvasKit.YELLOW);
canvas.drawPath(path, paint);
paint.delete();
path.delete();
});
});
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