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Numpy Beginner's Guide (Update)

Numpy Beginner's Guide (Update)

By : Ivan Idris
2 (1)
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Numpy Beginner's Guide (Update)

Numpy Beginner's Guide (Update)

2 (1)
By: Ivan Idris

Overview of this book

This book is for the scientists, engineers, programmers, or analysts looking for a high-quality, open source mathematical library. Knowledge of Python is assumed. Also, some affinity, or at least interest, in mathematics and statistics is required. However, I have provided brief explanations and pointers to learning resources.
Table of Contents (16 chapters)
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14
C. NumPy Functions' References
15
Index

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)
    Time for Action – accessing surface pixel data with NumPy

    The following code performs the tiling of the image:

    import pygame...

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