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annotate nagslang/utils.py @ 362:d0aeb893967d

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Transparent moonlight
author Neil Muller <drnlmuller@gmail.com>
date Fri, 06 Sep 2013 20:12:07 +0200
parents f0e8970ab804
children ca89d566f9ef
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1 import pygame
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2 import pygame.locals as pgl
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4 from pymunk.vec2d import Vec2d
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7 def convert_colour(colour):
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8 if isinstance(colour, pygame.Color):
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9 return colour
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10 if isinstance(colour, tuple):
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11 return pygame.Color(*colour)
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12 if isinstance(colour, basestring):
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13 return pygame.Color(colour)
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14 raise ValueError()
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17 def vec_from_angle(angle, length=1):
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18 vec = Vec2d(length, 0)
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19 vec.angle = angle
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20 return vec
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23 def vec_with_length(coords, length=1):
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24 vec = Vec2d(coords)
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25 # Don't crash if we're created a zero length vector
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26 if vec.length != 0:
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27 vec.length = length
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28 return vec
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31 def tile_surface(size, tile_image, alpha=255):
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32 # create a surface, approriately tiled
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33 surface = pygame.surface.Surface(size, pgl.SRCALPHA)
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34 surface.fill(pygame.color.Color(0, 0, 0, alpha))
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35 x_step = tile_image.get_rect().width
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36 y_step = tile_image.get_rect().height
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37 x_count = size[0] // x_step + 1
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38 y_count = size[1] / y_step + 1
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39 tile_rect = pygame.rect.Rect(0, 0, x_step, y_step)
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40 for x in range(x_count):
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41 tile_rect.x = x * x_step
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42 for y in range(y_count):
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43 tile_rect.y = y * y_step
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44 surface.blit(tile_image, tile_rect)
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45 return surface