Time for Action – accessing surface pixel data with NumPy

In this section, we will tile a small image to fill the game screen.

1. The array2d() function copies pixels into a two-dimensional array (and there is a similar function for three-dimensional arrays). Copy the pixels from the avatar image into an array:

   pixels = pygame.surfarray.array2d(img)

2. Create the game screen from the shape of the pixels array using the shape attribute of the array. Make the screen seven times larger in both directions:

   X = pixels.shape[0] * 7
   Y = pixels.shape[1] * 7
   screen = pygame.display.set_mode((X, Y))

3. Tiling the image is easy with the NumPy the tile() function. The data needs to be converted into integer values, because Pygame defines colors as integers:

   new_pixels = np.tile(pixels, (7, 7)).astype(int)

4. The surfarray module has a special function blit_array() to display the array on the screen:

   pygame.surfarray.blit_array(screen, new_pixels)

   

   The following code performs the tiling of the image:

   import pygame...