void draw(SkCanvas* canvas) {

    SkPaint paint;

    paint.setAntiAlias(true);

    SkPoint cubics[] = { { 3, 1 },    { 4, 2 }, { 5, 1 },    { 7, 3 },

                      /* { 7, 3 }, */ { 6, 4 }, { 7, 5 },    { 5, 7 },

                      /* { 5, 7 }, */ { 4, 6 }, { 3, 7 },    { 1, 5 },

                      /* { 1, 5 }, */ { 2, 4 }, { 1, 3 }, /* { 3, 1 } */ };

    SkColor colors[] = { SK_ColorRED, SK_ColorBLUE, SK_ColorYELLOW, SK_ColorCYAN };

    canvas->scale(30, 30);

    canvas->drawPatch(cubics, colors, nullptr, paint);

    SkPoint text[] = { {3,0.9f}, {4,2.5f}, {5,0.9f}, {7.5f,3.2f}, {5.5f,4.2f},

            {7.5f,5.2f}, {5,7.5f}, {4,5.9f}, {3,7.5f}, {0.5f,5.2f}, {2.5f,4.2f},

            {0.5f,3.2f} };

    paint.setTextSize(18.f / 30);

    paint.setTextAlign(SkPaint::kCenter_Align);

    for (int i = 0; i< 10; ++i) {

       char digit = '0' + i;

       canvas->drawText(&digit, 1, text[i].fX, text[i].fY, paint);

    }

    canvas->drawString("10", text[10].fX, text[10].fY, paint);

    canvas->drawString("11", text[11].fX, text[11].fY, paint);

    paint.setStyle(SkPaint::kStroke_Style);

    canvas->drawPoints(SkCanvas::kPolygon_PointMode, 12, cubics, paint);

    canvas->drawLine(cubics[11].fX, cubics[11].fY, cubics[0].fX, cubics[0].fY, paint);

}

​