Source Code for Module SmootLight.pixelmappers.SimpleMapper

 1  from operationscore.PixelMapper import * 
 2  import util.Geo as Geo 
 3  import math 
 4  import sys 
 5 -class SimpleMapper(PixelMapper): 
 6      """SimpleMapper is a PixelMapper which maps events to the nearest Pixel.  It also supports 
 7      strings of the form: 
 8      {x}>5, {y}<10, {x}*{y}<{x}, etc. (Conditions, separated by commas.  Standard python syntax such 
 9      as and and or may also be 
10      used).  You may use 'math.' functions such as math.sqrt, etc.  It also accepts lists of strings""" 
11 -    def mappingFunction(self, eventLocation, screen): 
12          if type(eventLocation) == type(tuple()): 
13              bestDist = sys.maxint  
14              bestPixel = None 
15              [x,y] = eventLocation 
16              for (x,pixel) in screen.pixelsInRange(x-self['CutoffDist'], \ 
17                      x+self['CutoffDist']): 
18                  pixelDist = Geo.dist(pixel.location, eventLocation) 
19                  if pixelDist < bestDist: 
20                      bestPixel = pixel 
21                      bestDist = pixelDist 
22              if bestPixel != None: 
23                  return [(bestPixel,1)] 
24              else: 
25                  return []  
26          else: 
27              #{x}>5,{y}<k 
28              ret = [] 
29              if not isinstance(eventLocation, list): 
30                  eventLocation = eventLocation.replace('{x}', 'pixel.location[0]') 
31                  eventLocation = eventLocation.replace('{y}', 'pixel.location[1]') 
32                  conditions = eventLocation.split(',') 
33              else: 
34                  conditions = eventLocation #TODO: check for lists of strings 
35              conditionLambdas = [eval('lambda pixel:'+condition) for condition in conditions] 
36               
37              for pixel in screen: 
38                  try: 
39                      pixelValid = True 
40                      for p in conditionLambdas: 
41                          if p(pixel) == False: 
42                              pixelValid = False 
43                              continue 
44                      if pixelValid: 
45                          ret.append((pixel, 1)) 
46                  except Exception as exp: 
47                      exp.message += 'Bad Event Condition' 
48                      raise exp 
49              return ret 
50