clipped_shapes.cpp

SkPath star() {
  SkPath starPath;

    float cx = 100, cy = 100;
    float outerRadius = 80;
    float innerRadius = 35;
    int numPoints = 5;

    for (int i = 0; i <= numPoints * 2; ++i) {
        float angle = i * SK_ScalarPI / numPoints - SK_ScalarPI / 2;
        float radius = (i % 2 == 0) ? outerRadius : innerRadius;
        float x = cx + cosf(angle) * radius;
        float y = cy + sinf(angle) * radius;

        if (i == 0)
            starPath.moveTo(x, y);
        else
            starPath.lineTo(x, y);
    }

    starPath.close(); 
  return starPath;
}

void draw(SkCanvas* canvas) {
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setColor(SK_ColorRED);

	SkPaint borderPaint;
    borderPaint.setAntiAlias(true);
    borderPaint.setStyle(SkPaint::kStroke_Style); 
    borderPaint.setStrokeWidth(4.0f);   

    SkPath circle;
    circle.addCircle(20, 30, 150);
    circle.setFillType(SkPathFillType::kInverseWinding);
    
	canvas->save();
    canvas->clipPath(circle, SkClipOp::kDifference, false);

    canvas->drawPath(star(), paint);

    circle.setFillType(SkPathFillType::kWinding);

	canvas->drawPath(circle, borderPaint);

    canvas->restore();
    canvas->translate(100, 100);
}