Function drawLine

deps/SDL2/test/testgesture.c:93–100

}

static void
drawLine(SDL_Surface *screen, float x0, float y0, float x1, float y1, unsigned int col)
{
    float t;
    for (t = 0; t < 1; t += (float) (1.0f / SDL_max(SDL_fabs(x0 - x1), SDL_fabs(y0 - y1)))) {
        setpix(screen, x1 + t * (x0 - x1), y1 + t * (y0 - y1), col);
    }
}

static void
drawCircle(SDL_Surface *screen, float x, float y, float r, unsigned int c)