Mercurial > traipse_dev
annotate orpg/mapper/region.py @ 122:36919b8a3ef9 alpha
Traipse Alpha 'OpenRPG' {091031-00}
Traipse is a distribution of OpenRPG that is designed to be easy to setup and go.
Traipse also makes it easy for developers to work on code without fear of
sacrifice. 'Ornery-Orc' continues the trend of 'Grumpy' and adds fixes to the
code. 'Ornery-Orc's main goal is to offer more advanced features and enhance the
productivity of the user.
Update Summary (Cleaning up for Beta)
Added Bookmarks
Fix to Remote Admin Commands
Minor fix to text based Server
Fix to Pretty Print, from Core
Fix to Splitter Nodes not being created
Fix to massive amounts of images loading, from Core
Added 'boot' command to remote admin
Added confirmation window for sent nodes
Minor changes to allow for portability to an OpenSUSE linux OS
Miniatures Layer pop up box allows users to turn off Mini labels, from FlexiRPG
Zoom Mouse plugin added
Images added to Plugin UI
Switching to Element Tree
Map efficiency, from FlexiRPG
Added Status Bar to Update Manager
default_manifest.xml renamed to default_upmana.xml
Cleaner clode for saved repositories
New TrueDebug Class in orpg_log
Mercurial's hgweb folder is ported to upmana
Happy Halloween!
author | sirebral |
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date | Sat, 31 Oct 2009 22:07:55 -0500 |
parents | 449a8900f9ac |
children | dcae32e219f1 |
rev | line source |
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0
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1 # Copyright (C) 2000-2001 The OpenRPG Project |
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2 # |
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3 # openrpg-dev@lists.sourceforge.net |
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4 # |
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5 # This program is free software; you can redistribute it and/or modify |
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6 # it under the terms of the GNU General Public License as published by |
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7 # the Free Software Foundation; either version 2 of the License, or |
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8 # (at your option) any later version. |
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9 # |
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10 # This program is distributed in the hope that it will be useful, |
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11 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 # GNU General Public License for more details. |
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14 # |
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15 # You should have received a copy of the GNU General Public License |
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16 # along with this program; if not, write to the Free Software |
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17 # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 # -- |
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19 # |
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20 # File: mapper/region.py |
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21 # Author: Mark Tarrabain |
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22 # Maintainer: |
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23 # Version: |
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24 # $Id: region.py,v 1.10 2006/11/04 21:24:21 digitalxero Exp $ |
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25 # |
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26 __version__ = "$Id: region.py,v 1.10 2006/11/04 21:24:21 digitalxero Exp $" |
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27 |
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28 import sys |
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29 |
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30 # This class manages the edge of a polygon |
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31 # it is employed by scan_convert to trace each edge of the polygon as the |
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32 # scan converter advances past each Y coordinate |
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33 # A bresenham-type of algorithm is used to avoid expensive computation during |
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34 # use - no floating point arithmetic is needed. |
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35 class Edge: |
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36 def __init__(self,start,end): |
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37 self.startx=start.X |
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38 self.starty=start.Y |
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39 self.endx=end.X |
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40 self.endy=end.Y |
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41 self.dy=self.endy-self.starty |
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42 self.cx=self.startx |
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43 self.bottom=0 |
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44 self.dir = 0 |
20 | 45 if self.endx>self.startx: self.dx = int((self.endx-self.startx)/self.dy) |
46 else: self.dx = -int((self.startx-self.endx)/self.dy) | |
0
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47 self.error = 0 |
20 | 48 if self.endx >= self.startx: self.inc = (self.endx-self.startx)%self.dy |
49 else: self.inc = (self.startx-self.endx)%self.dy | |
0
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50 |
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51 def advance(self): |
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52 self.cx += self.dx |
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53 self.error += self.inc |
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54 if (self.error>=self.dy): |
20 | 55 if (self.endx<self.startx): self.cx -= 1 |
56 else: self.cx += 1 | |
0
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57 self.error -= self.dy |
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58 |
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59 # Utilitarian class for describing a coordinate in 2D space |
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60 class IPoint: |
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61 def __init__(self): |
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62 X=0 |
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63 Y=0 |
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64 |
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65 def __str__(self): |
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66 return "(X:" + str(self.X) + ", Y:" + str(self.Y) + ")" |
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67 |
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68 def pluseq(self,b): |
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69 self.X += b.X |
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70 self.Y += b.Y |
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71 |
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72 def minuseq(self,b): |
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73 self.X -= b.X |
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74 self.Y -= b.Y |
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75 |
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76 def make(self,x,y): |
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77 self.X=x |
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78 self.Y=y |
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79 return self |
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80 |
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81 def equals(self,b): |
20 | 82 if self.X==b.X and self.Y==b.Y: return 1 |
0
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83 return 0 |
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84 |
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85 def less(self,b): |
20 | 86 if self.Y<b.Y or (self.Y==b.Y and self.X<b.X): return 1 |
0
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87 return 0 |
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88 |
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89 def greater(self,b): |
20 | 90 if self.Y>b.Y or (self.Y==b.Y and self.X>b.X): return 1 |
0
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91 return 0 |
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92 |
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93 # generic rectangle class |
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94 class IRect: |
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95 def __init__(self): #initializes to an invalid rectangle |
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96 self.left=999999 |
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97 self.top=999999 |
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98 self.right=-999999 |
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99 self.bottom=-999999 |
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100 |
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101 def __str__(self): |
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102 return "[ left:"+str(self.left)+", top:"+str(self.top)+", right:"+str(self.right)+", bottom:"+str(self.bottom)+" ]" |
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103 |
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104 def ToPoly(self): |
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105 thelist = [] |
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106 thelist.append(IPoint().make(self.left,self.top)) |
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107 thelist.append(IPoint().make(self.right,self.top)) |
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108 thelist.append(IPoint().make(self.right,self.bottom)) |
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109 thelist.append(IPoint().make(self.left,self.bottom)) |
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110 return thelist |
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111 |
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112 def Width(self): |
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113 return self.right-self.left+1 |
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114 |
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115 def Height(self): |
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116 return self.bottom-self.top+1 |
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117 |
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118 def GetX(self): |
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119 return self.left |
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120 |
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121 def GetY(self): |
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122 return self.top |
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123 |
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124 def GetW(self): |
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125 return self.right-self.left+1 |
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126 |
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127 def GetH(self): |
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128 return self.bottom-self.top+1 |
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129 |
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130 def Size(self): |
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131 return IPoint().make(self.right-self.left+1,self.bottom-self.top+1) |
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132 |
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133 def TopLeft(self): |
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134 return IPoint().make(self.left,self.top) |
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135 |
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136 def BottomRight(self): |
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137 return IPoint().make(self.right,self.bottom) |
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138 |
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139 def Bounds(self): |
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140 return IRect().make(0,0,self.right-self.left,self.bottom-self.top) |
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141 |
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142 def Resize(self,nL,nT,nR,nB): |
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143 self.left+=nL |
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144 self.top+=nT |
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145 self.right+=nR |
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146 sel.bottom+=nB |
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147 |
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148 def IsValid(self): |
20 | 149 if (self.left<=self.right and self.top<=self.bottom): return 1 |
0
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150 return 0 |
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151 |
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152 def add(self,pt): |
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153 return IRect().make(self.left+pt.X,self.top+pt.Y,self.right+pt.X,self.bottom+pt.Y) |
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154 |
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155 def subtract(self,pt): |
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156 return IRect().make(self.left+pt.X,self.top+pt.Y,self.right+pt.X,self.bottom+pt.Y) |
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157 |
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158 def intersect(self,rect): |
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159 return IRect().make(max(self.left,rect.left), |
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160 max(self.top,rect.top),min(self.right,rect.right), |
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161 min(self.bottom,rect.bottom)) |
0
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162 |
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163 def union(self,rect): |
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164 return IRect().make(min(self.left,rect.left), |
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165 min(self.top,rect.top),max(self.right,rect.right), |
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166 max(self.bottom,rect.bottom)) |
0
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167 |
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168 def equals(self,rect): |
20 | 169 if (self.top==rect.top and self.bottom==rect.bottom and self.left==rect.left and self.right==rect.right): return 1 |
0
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170 return 0 |
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171 |
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172 def make(self,l,t,r,b): |
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173 self.left=l |
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174 self.right=r |
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175 self.top=t |
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176 self.bottom=b |
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177 return self |
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178 |
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179 # A span is a single, contiguous horizontal line. The routine scan_convert |
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180 # returns a list of these that describe the polygon |
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181 class ISpan: |
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182 def __init__(self,x1,x2,ypos): |
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183 self.left=x1 |
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184 self.right=x2 |
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185 self.y=ypos |
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186 |
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187 def __str__(self): |
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188 return "(" + str(self.left) + " to " + str(self.right) + " at " + str(self.y) + ")" |
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189 |
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190 # clipping rectangle class -- this class is a single node in a linked list |
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191 # of rectangles that describe a region |
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192 |
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193 class ClipRect: |
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194 def __init__(self): |
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195 self.next=None |
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196 self.prev=None |
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197 self.bounds=IRect().make(0,0,0,0) |
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198 |
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199 |
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200 # cliprectlist -- the container class that manages a list of cliprects |
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201 class ClipRectList: |
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202 def __init__(self): |
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203 self.first=None |
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204 self.last=None |
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205 self.count=0 |
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206 |
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207 def __str__(self): |
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208 x="[" |
20 | 209 for y in self.GetList(): x+=" "+str(y.bounds)+" " |
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210 x+="]" |
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211 return x |
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212 |
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213 #remove all rectangles from list |
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214 def Clear(self): |
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215 while(self.first): |
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216 rect=self.first |
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217 self.first=self.first.next |
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218 del rect |
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219 self.last=None |
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220 self.count=0 |
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221 |
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222 #add a new clipping rectangle to list |
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223 def AddRect(self,rect): |
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224 rect.prev=None |
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225 rect.next=self.first |
20 | 226 if not (self.first is None): self.first.prev=rect |
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227 self.first=rect |
20 | 228 if self.last is None: self.last=rect |
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229 self.count += 1 |
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230 |
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231 #removes the passed clipping rectangle from the list |
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232 def RemoveRect(self,rect): |
20 | 233 if not (rect.prev is None): rect.prev.next=rect.next |
234 else: self.first=rect.next | |
235 if not (rect.next is None): rect.next.prev=rect.prev | |
236 else: self.last=rect.prev | |
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237 self.count -= 1 |
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238 |
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239 # find the clipping rectangle at the the beginning of the list, remove it, |
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240 # and return it |
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241 def RemoveHead(self): |
20 | 242 if self.count==0: return None |
0
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243 rect=self.first |
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244 self.first=rect.next |
20 | 245 if (self.first is None): self.last=None |
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246 self.count -= 1 |
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247 return rect |
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248 |
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249 # stealrects -- appends the list of clipping rectangles in pclist to the current |
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250 # list. removes the entries from pclist |
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251 def StealRects(self,pclist): |
20 | 252 if pclist.first is None: return |
0
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253 if self.first is None: |
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254 self.first=pclist.first |
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255 self.last=pclist.last |
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256 else: |
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257 self.last.next=pclist.first |
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258 pclist.first.prev=self.last |
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259 self.last=pclist.last |
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260 self.count += pclist.count |
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261 pclist.first = None |
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262 pclist.last = None |
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263 pclist.count = 0 |
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264 |
71
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265 # utilitarian procedure to return all clipping rectangles as a Python list |
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266 def GetList(self): |
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267 result=[] |
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268 f = self.first |
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269 while f: |
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270 result.append(f) |
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271 f = f.next |
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272 return result |
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273 |
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274 # some utility procedures, defined outside the scope of any class to ensure |
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275 # efficiency |
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276 |
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277 def _hSortCmp(rect1,rect2): |
20 | 278 if (rect1.bounds.left<rect2.bounds.left): return -1 |
279 if (rect1.bounds.left>rect2.bounds.left): return 1 | |
280 if (rect1.bounds.top<rect2.bounds.top): return -1 | |
281 if (rect1.bounds.top>rect2.bounds.top): return 1 | |
0
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282 return 0 |
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283 |
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284 def _vSortCmp(rect1,rect2): |
20 | 285 if (rect1.bounds.top<rect2.bounds.top): return -1 |
286 if (rect1.bounds.top>rect2.bounds.top): return 1 | |
287 if (rect1.bounds.left<rect2.bounds.left): return -1 | |
288 if (rect1.bounds.left>rect2.bounds.left): return 1 | |
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289 return 0 |
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290 |
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291 # this is the class for which this whole source file is designed! |
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292 # a Region is maintained as an optimal set of non-intersecting rectangles |
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293 # whose union is the 2D area of interest. At the end of each of the public |
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294 # procedures that may alter the region's structure, the set of rectangles is |
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295 # passed through an optimization phase, that joins any rectangles that are found |
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296 # to be adjacent and can be combined into a single, larger rectangle |
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297 |
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298 class IRegion: |
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299 def __init__(self): |
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300 self.crects=ClipRectList() |
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301 self.firstclip=None |
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302 |
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303 def __AllocClipRect(self): |
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304 return ClipRect() |
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305 |
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306 def __FreeClipRect(self,p): |
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307 del p |
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308 |
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309 def Clear(self): |
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310 self.crects.Clear() |
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311 |
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312 def isEmpty(self): |
20 | 313 if self.crects.first: return 0 |
0
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314 return 1 |
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315 |
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316 def Copy(self,dest): |
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317 dest.Clear() |
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318 p=self.crects.first |
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319 while p: |
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320 dest.__AddRect(p.bounds) |
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321 p=p.next |
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322 |
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323 def __AddRect(self,rect): |
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324 cr=self.__AllocClipRect() |
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325 cr.bounds=IRect().make(rect.left,rect.top,rect.right,rect.bottom) |
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326 self.crects.AddRect(cr) |
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327 return cr |
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328 |
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329 # This is the magic procedure that always makes it possible to merge adjacent |
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330 # rectangles later. It is called once for each rectangle to be combined |
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331 # with the current region. Basically, it dices the current region into |
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332 # horizontal bands where any rectangle is found to be beside the one being |
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333 # examined. This tends to leave more rectangles than necessary in the region, |
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334 # but they can be culled during the optimization phase when they are combined |
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335 # with adjacent rectangles. |
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336 |
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337 def __Examine(self,rect): |
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338 newlist = ClipRectList() |
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339 while not (self.crects.first is None): |
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340 p = self.crects.RemoveHead() |
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341 if (p.bounds.right+1==rect.left or p.bounds.left==rect.right+1): |
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342 if (p.bounds.top<rect.top and p.bounds.bottom>rect.bottom): |
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343 cnew=[IRect().make(p.bounds.left,p.bounds.top,p.bounds.right,rect.top-1), |
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344 IRect().make(p.bounds.left,rect.top,p.bounds.right,rect.bottom), |
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345 IRect().make(p.bounds.left,rect.bottom+1,p.bounds.right,p.bounds.bottom)] |
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346 elif (p.bounds.top<rect.top and p.bounds.bottom>rect.top): |
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347 cnew=[IRect().make(p.bounds.left,p.bounds.top,p.bounds.right,rect.top-1), |
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348 IRect().make(p.bounds.left,rect.top,p.bounds.right,p.bounds.bottom)] |
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349 elif (p.bounds.top<rect.bottom and p.bounds.bottom>rect.bottom): |
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350 cnew=[IRect().make(p.bounds.left,p.bounds.top,p.bounds.right,rect.bottom), |
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351 IRect().make(p.bounds.left,rect.bottom+1,p.bounds.right,p.bounds.bottom)] |
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352 else: |
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353 cnew=[IRect().make(p.bounds.left,p.bounds.top,p.bounds.right,p.bounds.bottom)] |
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354 self.__FreeClipRect(p) |
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355 for i in cnew: |
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356 if (i.IsValid()): |
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357 newclip=self.__AllocClipRect() |
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358 newclip.bounds=i |
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359 newlist.AddRect(newclip) |
20 | 360 else: newlist.AddRect(p) |
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361 self.crects.StealRects(newlist) |
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362 |
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363 def __IncludeRect(self,rect): |
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364 tmprg=IRegion() |
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365 tmprg.__AddRect(rect) |
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366 p = self.crects.first |
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367 while p: |
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368 tmprg.__ExcludeRect(p.bounds) |
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369 p = p.next |
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370 self.crects.StealRects(tmprg.crects) |
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371 |
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372 def IncludeRect(self,rect): |
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373 tmprg = IRegion() |
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374 tmprg.Clear() |
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375 tmprg.__AddRect(rect) |
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376 self.__Examine(rect) |
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377 p= self.crects.first |
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378 while p: |
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379 tmprg.__Examine(p.bounds) |
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380 p=p.next |
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381 p=tmprg.crects.first |
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382 while p: |
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383 self.__IncludeRect(p.bounds) |
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384 p=p.next |
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|
385 self.Optimize() |
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386 |
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387 def IncludeRegion(self,regn): |
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388 tmprg = IRegion() |
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389 regn.Copy(tmprg) |
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390 p = self.crects.first |
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|
391 while p: |
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392 tmprg.__Examine(p.bounds) |
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393 p=p.next |
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394 p = tmprg.crects.first |
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395 while p: |
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396 self.__Examine(p.bounds) |
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397 self.__IncludeRect(p.bounds) |
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|
398 p = p.next |
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|
399 self.Optimize() |
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|
400 |
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401 def __ExcludeRect(self,rect): |
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402 newlist=ClipRectList() |
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403 while not (self.crects.first is None): |
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404 pcclip=self.crects.RemoveHead() |
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405 hide=rect.intersect(pcclip.bounds) |
20 | 406 if not hide.IsValid(): newlist.AddRect(pcclip) |
0
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407 else: |
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408 #make 4 new rectangles to replace the one taken out |
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409 # |
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410 # AAAAAAAAAAAA |
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411 # AAAAAAAAAAAA |
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412 # BBBB CCCC |
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413 # BBBB CCCC |
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414 # DDDDDDDDDDDD |
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415 # DDDDDDDDDDDD |
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416 # the center rectangle is the one to remove, rectangles A,B,C and D |
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417 # get created. If the rectangle is not in the middle, then the |
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418 # corresponding rectangle that should have been on "that side" of |
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419 # the current rectangle will have IsValid==False, so it will be |
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420 # rejected. |
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421 cnew=[IRect().make(pcclip.bounds.left,hide.top,hide.left-1,hide.bottom), |
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422 IRect().make(hide.right+1,hide.top,pcclip.bounds.right,hide.bottom), |
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423 IRect().make(pcclip.bounds.left,hide.bottom+1,pcclip.bounds.right,pcclip.bounds.bottom), |
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424 IRect().make(pcclip.bounds.left,pcclip.bounds.top,pcclip.bounds.right,hide.top-1) ] |
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425 self.__FreeClipRect(pcclip) |
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426 for i in cnew: |
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427 if (i.IsValid()): |
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428 newclip=self.__AllocClipRect() |
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429 newclip.bounds=i |
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|
430 newlist.AddRect(newclip) |
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431 self.crects.last=None |
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432 self.crects.StealRects(newlist) |
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433 self.Optimize() |
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434 |
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435 def ExcludeRect(self,rect): |
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436 self.__ExcludeRect(rect) |
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|
437 self.Optimize() |
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|
438 |
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|
439 def ExcludeRegion(self,reg): |
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440 pclist = reg.crects.first |
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|
441 while pclist: |
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|
442 self.__ExcludeRect(pclist.bounds) |
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|
443 pclist = pclist.next |
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|
444 self.Optimize() |
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parents:
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|
445 |
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|
446 def __IntersectRect(self,rect): |
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|
447 newlist=ClipRectList() |
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448 while not self.crects.first is None: |
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|
449 pcclip=self.crects.RemoveHead() |
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|
450 hide=rect.intersect(pcclip.bounds) |
20 | 451 if not hide.IsValid(): newlist.AddRect(pcclip) |
0
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|
452 else: |
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|
453 cnew=[IRect().make(pcclip.bounds.left,hide.top,hide.left-1,hide.bottom), |
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454 IRect().make(hide.right+1,hide.top,pcclip.bounds.right,hide.bottom), |
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|
455 IRect().make(pcclip.bounds.left,hide.bottom+1,pcclip.bounds.right,pcclip.bounds.bottom), |
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|
456 IRect().make(pcclip.bounds.left,pcclip.bounds.top,pcclip.bounds.right,hide.top-1) ] |
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457 self.__FreeClipRect(pcclip) |
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|
458 for i in cnew: |
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|
459 if (i.IsValid()): |
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|
460 newclip=self.__AllocClipRect() |
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|
461 newclip.bounds=i |
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|
462 newlist.AddRect(newclip) |
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463 self.crects.last = None |
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464 self.crects.StealRects(newlist) |
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|
465 |
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466 def IntersectRect(self,rect): |
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467 self.__IntersectRect(rect) |
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|
468 self.Optimize() |
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|
469 |
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|
470 def IntersectRegion(self,reg): |
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471 clist=ClipRectList() |
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472 pcvclip = reg.crects.first |
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|
473 while pcvclip: |
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474 pchclip = self.crects.first |
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|
475 while pchclip: |
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476 crect=pcvclip.bounds.intersect(pchclip.bounds) |
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|
477 if crect.IsValid(): |
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changeset
|
478 newclip=self.__AllocClipRect() |
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|
479 newclip.bounds=crect |
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|
480 clist.AddRect(newclip) |
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|
481 pchclip = pchclip.next |
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|
482 pcvclip = pcvclip.next |
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|
483 self.Clear() |
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|
484 self.crects.StealRects(clist) |
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|
485 self.Optimize() |
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|
486 |
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|
487 def GetBounds(self): |
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|
488 bounds=IRect() |
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|
489 pcclip = self.crects.first |
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|
490 while pcclip: |
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|
491 bounds=bounds.union(pcclip.bounds) |
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492 pcclip = pcclip.next |
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|
493 return bounds |
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|
494 |
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|
495 def Optimize(self): |
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496 clist=self.crects.GetList() |
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|
497 removed=[] |
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498 keepgoing = 1 |
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499 while len(clist)>1 and keepgoing: |
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|
500 keepgoing=0 |
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501 clist.sort(lambda a,b:_vSortCmp(a,b)) |
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502 keys=range(len(clist)-1) |
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503 keys.reverse() |
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504 for i in keys: |
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505 if (clist[i].bounds.right==clist[i+1].bounds.left-1 and |
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506 clist[i].bounds.top==clist[i+1].bounds.top and |
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507 clist[i].bounds.bottom==clist[i+1].bounds.bottom): |
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508 clist[i].bounds.right=clist[i+1].bounds.right |
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509 x=clist[i+1] |
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510 del clist[i+1] |
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511 self.crects.RemoveRect(x) |
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512 self.__FreeClipRect(x) |
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513 keepgoing=1 |
20 | 514 if len(clist)<=1: break |
0
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515 clist.sort(lambda a,b:_hSortCmp(a,b)) |
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516 keys=range(len(clist)-1) |
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517 keys.reverse() |
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518 for i in keys: |
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519 if (clist[i].bounds.bottom==clist[i+1].bounds.top-1 and |
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520 clist[i].bounds.left==clist[i+1].bounds.left and |
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521 clist[i].bounds.right==clist[i+1].bounds.right): |
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522 clist[i].bounds.bottom=clist[i+1].bounds.bottom |
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523 x=clist[i+1] |
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524 del clist[i+1] |
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525 self.crects.RemoveRect(x) |
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526 self.__FreeClipRect(x) |
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527 keepgoing=1 |
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528 |
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529 def FromPolygon(self,polypt,mode): |
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530 thelist=self.scan_Convert(polypt) |
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531 for i in thelist: |
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532 r=IRect().make(i.left,i.y,i.right,i.y) |
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533 if mode: |
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534 self.__Examine(r) |
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535 self.__IncludeRect(r) |
20 | 536 else: self.__ExcludeRect(r) |
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537 self.Optimize() |
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538 |
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539 def GetRectList(self): |
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540 result=[] |
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541 i = self.crects.first |
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542 while i: |
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543 result.append(i.bounds) |
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544 i = i.next |
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545 return result |
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546 |
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547 #Portable implementation to scan-convert a polygon |
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548 #from algoritm described in Section 3.6.3 of Foley, et al |
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549 #returns a (possibly redundant) list of spans that comprise the polygon |
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550 #this routine does not manipulate the current region in any way, but |
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551 #is enclosed in this class to isolate its name from the global namespace |
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552 #invoke via IRegion().scan_Convert(polypt) |
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553 |
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554 def scan_Convert(self,polypt): |
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555 result=[] |
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556 ET = {} # edge table |
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557 i = 0 |
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558 size = len(polypt) |
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559 polylines=[] # list of lines in polygon |
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560 y = -1 |
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561 for i in xrange(size): |
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562 n = (i+1) % size |
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563 if polypt[i].Y < polypt[n].Y: |
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564 e = Edge(polypt[i],polypt[n]) |
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565 e.dir = 1 #moving top to bottom |
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566 polylines.append(e) |
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567 elif polypt[i].Y > polypt[n].Y: |
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568 e = Edge(polypt[n],polypt[i]) |
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569 e.dir = -1 #moving bottom to top |
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570 polylines.append(e) |
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571 elif polypt[i].X != polypt[n].X: # any horizontal lines just get added directly |
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572 sx = min(polypt[i].X,polypt[n].X) |
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573 ex = max(polypt[i].X,polypt[n].X) |
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574 result.append(ISpan(sx,ex,polypt[i].Y)) |
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575 size = len(polylines) |
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576 for i in xrange(size): |
20 | 577 if i == 0 and polylines[i].dir == -1: n = size-1 |
578 elif (polylines[i].dir == -1): n = i-1 | |
579 else: n = (i+1) % size | |
580 if (polylines[i].dir != polylines[n].dir): polylines[i].bottom = 1 | |
581 if i == 0 or polylines[i].starty < y: y = polylines[i].starty | |
582 if not ET.has_key(polylines[i].starty): ET[polylines[i].starty] = [] | |
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583 ET[polylines[i].starty].append(polylines[i]) #add to edge table, indexed by smaller y coordinate |
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584 AET = [] #active edge table |
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585 while len(AET) > 0 or len(ET) > 0: |
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586 if ET.has_key(y): #if current y value has entries in edge tabe |
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587 AET.extend(ET[y]) # add them to active edge table |
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588 del ET[y] #and delete the entries in the edge table |
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589 i = len(AET)-1 |
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590 vals = [] |
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591 while i >= 0: |
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592 if (AET[i].endy == y): #if at the end of this edge's run |
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593 if (AET[i].bottom): #check and see if we need one more point |
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594 vals.append(AET[i].cx) #we do, add it |
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595 del AET[i] # y=end of edge, so remove it |
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596 i -= 1 |
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597 i = 0 |
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598 while i < len(AET): # for every edge in AET |
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599 vals.append(AET[i].cx) # add x intercept |
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600 AET[i].advance() #and advance the edge one down |
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601 i += 1 |
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602 vals.sort() |
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603 i = 0 |
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604 while i < len(vals)-1: #split vals[] array into pairs and output them |
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605 result.append(ISpan(vals[i],vals[i+1],y)) |
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606 i += 2 |
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607 y += 1 |
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608 return result |