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annotate light8/stage.py @ 6:119369e60da1

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tag-heavy selection management is getting hard - about to switch to python lists
author drewp
date Sun, 07 Jul 2002 03:47:18 +0000
parents a76f775bb635
children 1b0266dd233a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 from Tkinter import *
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2
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3
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4 def printevent(ev):
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5 for k in dir(ev):
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6 if not k.startswith('__'):
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7 print k,getattr(ev,k)
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8 print ""
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9
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10
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11 class Stage(Canvas):
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12
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13 """a fancy widget that shows light locations (and optionally their
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14 aim locations on an image of the stage. you can select or
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15 multiselect lights and drag them up or down to change their
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16 brightness.
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17
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18 ctrl-a is select all,
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19 ctrl-shift-a or clicking on no light deselects all,
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20 re-clicking a light with shift key down toggles whether it's in the selection.
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21 ctrl-drag-rectangle deselects the lights in the rectangle,
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22 shift-drag-rectangle selects the lights in the rectangle,
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23 drag-rectangle selects only the lights in the rectangle.
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24
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25 a light can be selected on its location point, its aim point
0
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26 (which may or may not be present), or its name.
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27
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28 lights should be able to be interactively 'locked', which blocks
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29 them from being selected.
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30
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31 """
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32 def __init__(self,parent,**kw):
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33 if 'stageimage' in kw:
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34 stageimage=kw['stageimage']
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35 del kw['stageimage']
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36 else:
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37 stageimage=None
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38
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39 Canvas.__init__(self,parent,**kw)
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40
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41 if stageimage:
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42 img = Image('photo',stageimage)
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43 self.create_image(0,0,anchor='nw',image=img)
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44 self.create_rectangle(5,5,50,50)
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45
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46 self.bind("<ButtonPress-1>", self.leftpress)
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47 self.bind("<B1-Motion>", self.leftmotion)
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48 self.bind("<ButtonRelease-1>", self.leftrelease)
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49
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50 self.halo=11 # search radius for clicked items
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51
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52 self.lmbstate=None # as you perform with LMB, this goes from None to 'pressed','rectangle','levelchange'
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53
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54 self.alllights=[]
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55 self.selectedlights=[]
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56
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57 #
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58 # selection management
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59 #
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60 def clearselection(self,dyn=0):
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61 if dyn:
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62 seltag="dynselection"
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63 else:
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64 seltag="selection"
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65 for o in self.find_withtag(seltag):
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66 self.select(o,0,dyn)
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67
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68 def replacedynselection(self,newlightnames):
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69 for o in self.find_withtag('dynselection'):
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70 self.select(o,0,1)
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71 for o in newlightnames:
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72 self.select(o,1,1)
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73
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74 def select(self,obj,select=1,dyn=0): # select=0 for deselect
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75 if dyn:
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76 seltag="dynselection"
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77 else:
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78 seltag="selection"
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79 if select:
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80 print obj,"into selection"
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81 self.addtag_withtag(seltag,obj)
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82 for c in self.getlightbboxes(obj):
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83 self.create_rectangle(c[0]-2,c[1]-2,c[2]+2,c[3]+2,outline='red',tag="selectbox_%s"%obj)
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84 else:
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85 print obj,"out of select"
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86 self.dtag(obj,seltag)
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87 if 'selection' not in self.gettags(obj) and 'dynselection' not in self.gettags(obj):
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88 self.delete("selectbox_%s"%obj)
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89
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90 def incorporatedynselection(self):
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91 "put all dynselected objects in the regular selection"
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92 for o in self.find_withtag('dynselection'):
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93 self.dtag(o,'dynselection')
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94 self.addtag_withtag('selection',o)
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95 # no change for the graphics
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96
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97 #
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98 # LMB click or drag
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99 #
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100 def leftpress(self,ev):
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101
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102 self.lmbstate='pressed'
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103 self.lmbstart=(ev.x,ev.y)
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104
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105 shifted=ev.state & 1
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106 control=ev.state & 4
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107 touching=self.findoverlappinglights((ev.x-self.halo,ev.y-self.halo,ev.x+self.halo,ev.y+self.halo))
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108 istouching=len(touching)>0
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109
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110 if not istouching:
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111 # clicked in space
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112 if not shifted and not control:
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113 # either a deselect (if no motion) or a level change (if motion)
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114 self.clearselection()
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115 self.lmbstate='rectangle'
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116 if shifted or control:
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117 # with shift/control, add/subtract lights to selection
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118 self.lmbstate='rectangle'
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119
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120 else:
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121 # clicked a selectable object
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122 # toggle selection
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123 if 'selection' in self.gettags(touching[0]):
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124 if shifted:
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125 # deselect
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126 self.select(touching[0],0)
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127 # and do nothing else
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128 self.lmbstate=None
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129 else:
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130 # select only this light
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131 self.clearselection()
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132 self.select(touching[0])
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133 # and adjust its level
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134 self.lmbstate='levelchange'
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135
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136 else:
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137 if not shifted:
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138 self.clearselection()
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139 self.select(touching[0])
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140 # and adjust levels now
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141 self.lmbstate='levelchange'
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142
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143
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144 def leftmotion(self,ev):
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145
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146 coords=(ev.x,ev.y)
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147
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148 shifted=ev.state & 1
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149 control=ev.state & 4
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150
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151 if self.lmbstate=='levelchange':
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152 delta = self.lmbstart[1]-ev.y
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153 print "change by",delta
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154
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155 if self.lmbstate=='rectangle':
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156 sr = self.find_withtag('selectrect')
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157 if not sr:
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158 sr=self.create_rectangle( self.lmbstart[0],self.lmbstart[1],coords[0],coords[1],tag='selectrect')
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159 # sr=self.create_rectangle( *(self.lmbstart+coords), tag='selectrect' )
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160
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161 self.coords(sr,*(self.lmbstart+coords))
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162
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163 # redo the dynselection with the new rectangle
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164 self.replacedynselection([o for o in self.findoverlappinglights((self.lmbstart+coords),1)])
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165
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166 # need to handle ctrl
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167
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168 def leftrelease(self,ev):
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169 if self.lmbstate:
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170
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171 if self.lmbstate=='rectangle':
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172 self.delete('selectrect')
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173
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174 # all items that were in dynselection join the selection
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175 self.incorporatedynselection()
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176
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177 self.lmbstate=None
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178
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179 def nametag(self,name):
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180 "returns a safe version of the name that won't match other names"
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181 return name.replace(" ","__")
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182
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183 def addlight(self,name,location,aim=None):
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184
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185 tags='light selectable name_%s' % self.nametag(name)
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186
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187 self.create_oval(location[0]-2,location[1]-2,
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188 location[0]+2,location[1]+2,
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189 fill='red',tag=tags+" hotspot")
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190 self.create_text(location[0],location[1]+5,anchor='n',text=name,tag=tags)
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191 self.alllights.append(name)
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192
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193 def getlightbboxes(self,tag):
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194 """returns a list of bboxes for a light with a given name_ tag. the selection
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195 mechanism draws around these bboxes to show that a light is selected"""
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196 bboxes=[]
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197 for o in self.find_withtag(tag):
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198 if 'hotspot' in self.gettags(o):
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199 bboxes.append(self.bbox(o))
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200 return bboxes
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201
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202 def findoverlappinglights(self,box,enclosed=0):
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203 "returns all the different name_ tags for lights that are within (or enclosed by) the box"
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204 lights=[]
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205 if enclosed:
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206 candidates = self.find_enclosed(*box)
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207 else:
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208 candidates = self.find_overlapping(*box)
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209 for o in candidates:
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210 for t in self.gettags(o):
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211 if t.startswith("name_") and t not in lights:
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212 lights.append(t)
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213 return lights
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214
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215 root=Tk()
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216 s=Stage(root,stageimage='guysanddolls.ppm')
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217 s.addlight('drew',(80,80))
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218 s.addlight('house',(150,80))
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219 s.addlight('barn',(200,80))
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220 s.pack()
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221
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222 root.mainloop()