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1 # lightsim.py by Drew Perttula, 6/28/2002
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2 from __future__ import division
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3
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4 version="1.01"
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5
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6 import Image, ImageTk, ImageChops,ImageEnhance
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7 from Tkinter import Tk,Label,Scale,DoubleVar,Frame
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8 import time, glob
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9
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10 class Imagemixer(Label):
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11 """tk widget that can load images (based on a glob pattern: each file should
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12 be named like 'scene.light') and displays a weighted mix of the images"""
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13 def __init__(self,parent,*k,**kw):
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14 Label.__init__(self,parent,*k,**kw)
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15 self.im={}
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16
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17 self.itk = ImageTk.PhotoImage(Image.new('RGB',(100,100)))
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18 self.config(image=self.itk)
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19 self.loadedscale=0
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20 self.amounts={}
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21
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22 def loadallimgs(self,basename,scalefactor=1.0):
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23 """load images from disk, scale them immediately, subtract off
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24 the image called 'ambient' (if present) from all other
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25 images. Given basename like path/to/foo, loads images with
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26 names like path/to/foo.light1, path/to/foo.light2, etc. The
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27 filename after the . is considered to be the light name
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28 throughout the program. """
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29
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30 if self.loadedscale==scalefactor: # already loaded at this scale
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31 return
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32
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33 self.im={}
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34 ambientimg=None
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35 sizenotset=1
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36 for fullname in glob.glob(basename+".*"):
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37 x=fullname[fullname.find('.')+1:]
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38 self.im[x]=Image.open(fullname)
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39 if scalefactor!=1.0:
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40 self.im[x]=self.im[x].resize([a*scalefactor for a in self.im[x].size])
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41 if x=='ambient':
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42 ambientimg=self.im[x]
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43 if sizenotset:
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44 self.config(width=self.im[x].size[0],height=self.im[x].size[1])
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45 self.itk=ImageTk.PhotoImage(Image.new('RGB',self.im[x].size))
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46 self.config(image=self.itk)
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47 sizenotset=0
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48
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49 # subtract off an image called 'ambient' from all the rest
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50 if ambientimg is not None:
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51 for k in self.im.keys():
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52 if k!='ambient':
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53 self.im[k] = ImageChops.subtract(self.im[k],ambientimg)
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54
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55 self.loadedscale=scalefactor
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56 self._remix() # update the image
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57
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58 def _remix(self):
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59 """mix all the images in self.im together according to the
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60 weights in self.amounts. Each of those attributes are dicts
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61 with the light names for keys."""
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62 global fpslabel
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63 i=None
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64 amounts = self.amounts
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65 layers=0
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66 start=time.time()
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67 for k in self.im.keys():
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68 scale =amounts.get(k,0)
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69 if scale!=0:
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70 layers+=1
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71 acc=ImageEnhance.Brightness(self.im[k]).enhance(scale) # scale the image before adding
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72 # acc = ImageChops.add(base,self.im[k],1/scale) ## slower!
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73 if i==None:
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74 i=acc # use first layer directly
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75 else:
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76 i=ImageChops.add(i,acc) # add subsequent layers
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77 dur = time.time()-start
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78 fps=1.0/dur
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79 fpslabel.config(text="%.02f fps, %.02f layers/sec"%(fps,layers/dur))
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80 if i is not None:
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81 self.itk.paste(i) # put image i in the PhotoImage
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82
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83 def setamounts(self,amounts):
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84 self.amounts = amounts.copy()
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85 self._remix()
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86
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87 def lightnames(self):
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88 return self.im.keys()
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89
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90 basename='room'
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91
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92 root=Tk()
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93
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94 # Imagemixer._remix accesses this label, so it needs a name
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95 fpslabel=Label()
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96 fpslabel.pack()
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97
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98 Label(root,text="Use +/- to change image scale").pack()
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99
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100 mix=Imagemixer(root,relief='raised',bd=3)
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101
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102 scalefactor=.5
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103 mix.loadallimgs(basename,scalefactor)
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104 mix.pack()
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105
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106 #
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107 # +/- keys should reload the images at new scales
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108 #
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109 def changescale(by=0):
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110 global mix,scalefactor
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111 scalefactor+=by
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112 mix.loadallimgs(basename,scalefactor)
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113 root.bind("<Key-plus>",lambda ev: changescale(.15))
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114 root.bind("<Key-minus>",lambda ev: changescale(-.15))
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115
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116 amountvars={} # each light name maps to a Tkinter.DoubleVar object which the Scale adjusts
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117
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118 def redraw(*args):
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119 global l,amountvars,update
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120 # read the value out of each Scale
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121 amounts = dict([(k,v.get()) for k,v in amountvars.items()])
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122 mix.setamounts(amounts)
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123
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124 for x in mix.lightnames():
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125 # the Scale sets this; the redraw() callback reads it
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126 amountvars[x]=DoubleVar()
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127
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128 # a new frame for each slider row
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129 f=Frame(root,bd=1,relief='groove')
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130 f.pack(fill='x',expand=1)
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131 # title
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132 Label(f,text=x,width=10,anchor='e').pack(side='left')
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133 # slider
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134 s=Scale(f,from_=0,to=1,res=.01,
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135 orient='horiz',
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136 variable=amountvars[x],command=redraw)
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137 s.pack(side='left',fill='x',expand=1)
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138 if x=='ambient': # the 'ambient' level (if present) starts at 1
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139 s.set(1)
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140
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141 root.mainloop()
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142
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