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"""animation loading and manipulating functions.
<p>please note that this file is alpha, and is subject to modification in
future versions of pgu!</p>
"""
print 'pgu.ani','This module is alpha, and is subject to change.'
import math
import pygame
def _ani_load(tv,name,parts,frames,shape):
l = len(frames)
#print name,parts,l
n = parts.pop()
if len(parts):
s = l/n
for i in xrange(0,n):
_ani_load(tv,name + ".%d"%i,parts[:],frames[s*i:s*(i+1)],shape)
return
for i in xrange(0,n):
tv.images[name+".%d"%i] = frames[i],shape
def ani_load(tv,name,img,size,shape,parts):
"""load an animation from an image
<pre>ani_load(tv,name,image,size,shape,parts)</pre>
<dl>
<dt>tv<dd>vid to load into
<dt>name <dd>prefix name to give the images
<dt>image <dd>image to load anis from
<dt>size <dd>w,h size of image
<dt>shape <dd>shape of image (usually a subset of 0,0,w,h) used for collision detection
<dt>parts <dd>list of parts to divide the animation into
<br>for example parts = [4,5] would yield 4 animations 5 frames long, 20 total
<br>for example parts = [a,b,c] would yield ... images['name.a.b.c'] ..., a*b*c total
</dl>
"""
parts = parts[:]
parts.reverse()
w,h = size
frames = []
for y in xrange(0,img.get_height(),h):
for x in xrange(0,img.get_width(),w):
frames.append(img.subsurface(x,y,w,h))
_ani_load(tv,name,parts,frames,shape)
def image_rotate(tv,name,img,shape,angles,diff=0):
"""rotate an image and put it into tv.images
<pre>image_rotate(tv,name,image,shape,angles,diff=0)</pre>
<dl>
<dt>tv <dd>vid to load into
<dt>name <dd>prefix name to give the images
<dt>image <dd>image to load anis from
<dt>shape <dd>shape fimage (usually a subset of 0,0,w,h) used for collision detection
<dt>angles <dd>a list of angles to render in degrees
<dt>diff <dd>a number to add to the angles, to correct for source image not actually being at 0 degrees
</dl>
"""
w1,h1 = img.get_width(),img.get_height()
shape = pygame.Rect(shape)
ps = shape.topleft,shape.topright,shape.bottomleft,shape.bottomright
for a in angles:
img2 = pygame.transform.rotate(img,a+diff)
w2,h2 = img2.get_width(),img2.get_height()
minx,miny,maxx,maxy = 1024,1024,0,0
for x,y in ps:
x,y = x-w1/2,y-h1/2
a2 = math.radians(a+diff)
#NOTE: the + and - are switched from the normal formula because of
#the weird way that pygame does the angle...
x2 = x*math.cos(a2) + y*math.sin(a2)
y2 = y*math.cos(a2) - x*math.sin(a2)
x2,y2 = x2+w2/2,y2+h2/2
minx = min(minx,x2)
miny = min(miny,y2)
maxx = max(maxx,x2)
maxy = max(maxy,y2)
r = pygame.Rect(minx,miny,maxx-minx,maxy-miny)
#print r
#((ww-w)/2,(hh-h)/2,w,h)
tv.images["%s.%d"%(name,a)] = img2,r
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