Source

pygame / examples / vgrade.py

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#!/usr/bin/env python

"""This example demonstrates creating an image with Numeric
python, and displaying that through SDL. You can look at the
method of importing numeric and pygame.surfarray. This method
will fail 'gracefully' if it is not available.
I've tried mixing in a lot of comments where the code might
not be self explanatory, nonetheless it may still seem a bit
strange. Learning to use numeric for images like this takes a
bit of learning, but the payoff is extremely fast image
manipulation in python.

Just so you know how this breaks down. For each sampling of
time, 30% goes to each creating the gradient and blitting the
array. The final 40% goes to flipping/updating the display surface

If using an SDL version at least 1.1.8 the window will have
no border decorations.

The code also demonstrates use of the timer events."""


import os, pygame
from pygame.locals import *

try:
    from Numeric import *
    from RandomArray import *
except ImportError:
    raise SystemExit('This example requires Numeric and the pygame surfarray module')

pygame.surfarray.use_arraytype('numeric')

timer = 0
def stopwatch(message = None):
    "simple routine to time python code"
    global timer
    if not message:
        timer = pygame.time.get_ticks()
        return
    now = pygame.time.get_ticks()
    runtime = (now - timer)/1000.0 + .001
    print ("%s %s %s" %
           (message, runtime, ('seconds\t(%.2ffps)'%(1.0/runtime))))
    timer = now



def VertGrad3D(surf, topcolor, bottomcolor):
    "creates a new 3d vertical gradient array"
    topcolor = array(topcolor, copy=0)
    bottomcolor = array(bottomcolor, copy=0)
    diff = bottomcolor - topcolor
    width, height = surf.get_size()
    # create array from 0.0 to 1.0 triplets
    column = arange(height, typecode=Float)/height
    column = repeat(column[:, NewAxis], [3], 1)
    # create a single column of gradient
    column = topcolor + (diff * column).astype(Int)
    # make the column a 3d image column by adding X
    column = column.astype(UnsignedInt8)[NewAxis,:,:]
    #3d array into 2d array
    column = pygame.surfarray.map_array(surf, column)
    # stretch the column into a full image
    return resize(column, (width, height))



def DisplayGradient(surf):
    "choose random colors and show them"
    stopwatch()
    colors = randint(0, 255, (2, 3))
    grade = VertGrad3D(surf, colors[0], colors[1])
    pygame.surfarray.blit_array(surf, grade)
    pygame.display.flip()
    stopwatch('Gradient:')



def main():
    pygame.init()
    size = 600, 400
    os.environ['SDL_VIDEO_CENTERED'] = '1'
    screen = pygame.display.set_mode(size, NOFRAME, 0)

    pygame.event.set_blocked(MOUSEMOTION) #keep our queue cleaner
    pygame.time.set_timer(USEREVENT, 500)

    while 1:
        event = pygame.event.wait()
        if event.type in (QUIT, KEYDOWN, MOUSEBUTTONDOWN):
            break
        elif event.type == USEREVENT:
            DisplayGradient(screen)



if __name__ == '__main__': main()