#include <random>

​

void paintOctopus(float x, float y, int size_base, SkColor color, SkCanvas* canvas) {

    // Set up the paint to draw the head and legs

    SkPaint paint;

    paint.setAntiAlias(true);

    paint.setColor(color);

    int radius = 3 * size_base;

    // Draw the big head

    canvas->drawCircle(x, y, radius, paint);

    // Draw 8 small legs

    for (int leg = 0; leg < 8; ++leg) {

        canvas->drawCircle(x - radius + (2 * radius / 7.5 * leg),

                           y + radius - pow(abs(4 - leg), 2), size_base / 2 + 2, paint);

    }

    // Make the color a bit lighter for the eyes

    paint.setColor(SkColorSetRGB(std::min(255u, SkColorGetR(color) + 20),

                                 std::min(255u, SkColorGetG(color) + 20),

                                 std::min(255u, SkColorGetB(color) + 20)));

    // Draw the left and right eye

    canvas->drawCircle(x - size_base, y + size_base, size_base / 2, paint);

    canvas->drawCircle(x + size_base, y + size_base, size_base / 2, paint);

}

​

void draw(SkCanvas* canvas) {

    // Some helper functions to create random coordinates, sizes, and colors

    std::default_random_engine rng;

    const auto randScalar = [&rng](SkScalar min, SkScalar max) -> SkScalar {

        return std::uniform_real_distribution<SkScalar>(min, max)(rng);

    };

    const auto randOpaqueColor = [&rng]() -> SkColor {

        return std::uniform_int_distribution<uint32_t>(0, 0xFFFFFF)(rng) | 0xFF000000;

    };

​

    constexpr int numOctopods = 400;

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

        paintOctopus(randScalar(0, 256), randScalar(0, 256),

                     randScalar(6, 12), randOpaqueColor(), canvas);

    }

}