Mercurial > traipse_dev
annotate orpg/mapper/region.py @ 61:f3d8101211c4 ornery-dev
Traipse Dev 'OpenRPG' {090813-00}
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:
This update completes the front end of the Updater tab. Material is now ready to start adding to the Controls tab, however GUI planning needs to take place first. Player List and Game Server Menu Columns now have a minimum width and the software will refresh to that width on an update, if the column is too small.
author | sirebral |
---|---|
date | Thu, 13 Aug 2009 04:25:10 -0500 |
parents | 072ffc1d466f |
children | 449a8900f9ac |
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),max(self.top,rect.top),min(self.right,rect.right),min(self.bottom,rect.bottom)) |
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160 |
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161 def union(self,rect): |
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162 return IRect().make(min(self.left,rect.left),min(self.top,rect.top),max(self.right,rect.right),max(self.bottom,rect.bottom)) |
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163 |
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164 def equals(self,rect): |
20 | 165 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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166 return 0 |
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167 |
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168 def make(self,l,t,r,b): |
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169 self.left=l |
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170 self.right=r |
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171 self.top=t |
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172 self.bottom=b |
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173 return self |
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174 |
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175 # A span is a single, contiguous horizontal line. The routine scan_convert |
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176 # returns a list of these that describe the polygon |
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177 class ISpan: |
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178 def __init__(self,x1,x2,ypos): |
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179 self.left=x1 |
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180 self.right=x2 |
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181 self.y=ypos |
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182 |
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183 def __str__(self): |
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184 return "(" + str(self.left) + " to " + str(self.right) + " at " + str(self.y) + ")" |
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185 |
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186 # clipping rectangle class -- this class is a single node in a linked list |
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187 # of rectangles that describe a region |
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188 |
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189 class ClipRect: |
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190 def __init__(self): |
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191 self.next=None |
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192 self.prev=None |
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193 self.bounds=IRect().make(0,0,0,0) |
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194 |
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195 |
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196 # cliprectlist -- the container class that manages a list of cliprects |
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197 class ClipRectList: |
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198 def __init__(self): |
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199 self.first=None |
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200 self.last=None |
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201 self.count=0 |
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202 |
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203 def __str__(self): |
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204 x="[" |
20 | 205 for y in self.GetList(): x+=" "+str(y.bounds)+" " |
0
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206 x+="]" |
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207 return x |
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208 |
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209 #remove all rectangles from list |
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210 def Clear(self): |
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211 while(self.first): |
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212 rect=self.first |
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213 self.first=self.first.next |
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214 del rect |
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215 self.last=None |
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216 self.count=0 |
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217 |
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218 #add a new clipping rectangle to list |
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219 def AddRect(self,rect): |
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220 rect.prev=None |
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221 rect.next=self.first |
20 | 222 if not (self.first is None): self.first.prev=rect |
0
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223 self.first=rect |
20 | 224 if self.last is None: self.last=rect |
0
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225 self.count += 1 |
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226 |
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227 #removes the passed clipping rectangle from the list |
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228 def RemoveRect(self,rect): |
20 | 229 if not (rect.prev is None): rect.prev.next=rect.next |
230 else: self.first=rect.next | |
231 if not (rect.next is None): rect.next.prev=rect.prev | |
232 else: self.last=rect.prev | |
0
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233 self.count -= 1 |
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234 |
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235 # find the clipping rectangle at the the beginning of the list, remove it, |
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236 # and return it |
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237 def RemoveHead(self): |
20 | 238 if self.count==0: return None |
0
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239 rect=self.first |
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240 self.first=rect.next |
20 | 241 if (self.first is None): self.last=None |
0
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242 self.count -= 1 |
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243 return rect |
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244 |
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245 # stealrects -- appends the list of clipping rectangles in pclist to the current |
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246 # list. removes the entries from pclist |
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247 def StealRects(self,pclist): |
20 | 248 if pclist.first is None: return |
0
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249 if self.first is None: |
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250 self.first=pclist.first |
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251 self.last=pclist.last |
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252 else: |
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253 self.last.next=pclist.first |
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254 pclist.first.prev=self.last |
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255 self.last=pclist.last |
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256 self.count += pclist.count |
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257 pclist.first = None |
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258 pclist.last = None |
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259 pclist.count = 0 |
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260 |
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261 # utilitarian procedure to return all clipping rectangles as a Python list |
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262 def GetList(self): |
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263 result=[] |
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264 f = self.first |
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265 while f: |
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266 result.append(f) |
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267 f = f.next |
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268 return result |
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269 |
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270 # some utility procedures, defined outside the scope of any class to ensure |
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271 # efficiency |
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272 |
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273 def _hSortCmp(rect1,rect2): |
20 | 274 if (rect1.bounds.left<rect2.bounds.left): return -1 |
275 if (rect1.bounds.left>rect2.bounds.left): return 1 | |
276 if (rect1.bounds.top<rect2.bounds.top): return -1 | |
277 if (rect1.bounds.top>rect2.bounds.top): return 1 | |
0
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278 return 0 |
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279 |
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280 def _vSortCmp(rect1,rect2): |
20 | 281 if (rect1.bounds.top<rect2.bounds.top): return -1 |
282 if (rect1.bounds.top>rect2.bounds.top): return 1 | |
283 if (rect1.bounds.left<rect2.bounds.left): return -1 | |
284 if (rect1.bounds.left>rect2.bounds.left): return 1 | |
0
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285 return 0 |
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286 |
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287 # this is the class for which this whole source file is designed! |
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288 # a Region is maintained as an optimal set of non-intersecting rectangles |
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289 # whose union is the 2D area of interest. At the end of each of the public |
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290 # procedures that may alter the region's structure, the set of rectangles is |
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291 # passed through an optimization phase, that joins any rectangles that are found |
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292 # to be adjacent and can be combined into a single, larger rectangle |
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293 |
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294 class IRegion: |
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295 def __init__(self): |
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296 self.crects=ClipRectList() |
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297 self.firstclip=None |
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298 |
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299 def __AllocClipRect(self): |
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300 return ClipRect() |
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301 |
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302 def __FreeClipRect(self,p): |
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303 del p |
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304 |
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305 def Clear(self): |
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306 self.crects.Clear() |
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307 |
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308 def isEmpty(self): |
20 | 309 if self.crects.first: return 0 |
0
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310 return 1 |
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311 |
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312 def Copy(self,dest): |
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313 dest.Clear() |
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314 p=self.crects.first |
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315 while p: |
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316 dest.__AddRect(p.bounds) |
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317 p=p.next |
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318 |
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319 def __AddRect(self,rect): |
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320 cr=self.__AllocClipRect() |
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321 cr.bounds=IRect().make(rect.left,rect.top,rect.right,rect.bottom) |
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322 self.crects.AddRect(cr) |
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323 return cr |
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324 |
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325 # This is the magic procedure that always makes it possible to merge adjacent |
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326 # rectangles later. It is called once for each rectangle to be combined |
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327 # with the current region. Basically, it dices the current region into |
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328 # horizontal bands where any rectangle is found to be beside the one being |
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329 # examined. This tends to leave more rectangles than necessary in the region, |
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330 # but they can be culled during the optimization phase when they are combined |
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331 # with adjacent rectangles. |
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332 |
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333 def __Examine(self,rect): |
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334 newlist = ClipRectList() |
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335 while not (self.crects.first is None): |
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336 p = self.crects.RemoveHead() |
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337 if (p.bounds.right+1==rect.left or p.bounds.left==rect.right+1): |
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338 if (p.bounds.top<rect.top and p.bounds.bottom>rect.bottom): |
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339 cnew=[IRect().make(p.bounds.left,p.bounds.top,p.bounds.right,rect.top-1), |
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340 IRect().make(p.bounds.left,rect.top,p.bounds.right,rect.bottom), |
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341 IRect().make(p.bounds.left,rect.bottom+1,p.bounds.right,p.bounds.bottom)] |
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342 elif (p.bounds.top<rect.top and p.bounds.bottom>rect.top): |
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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,p.bounds.bottom)] |
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345 elif (p.bounds.top<rect.bottom and p.bounds.bottom>rect.bottom): |
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346 cnew=[IRect().make(p.bounds.left,p.bounds.top,p.bounds.right,rect.bottom), |
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347 IRect().make(p.bounds.left,rect.bottom+1,p.bounds.right,p.bounds.bottom)] |
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348 else: |
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349 cnew=[IRect().make(p.bounds.left,p.bounds.top,p.bounds.right,p.bounds.bottom)] |
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350 self.__FreeClipRect(p) |
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351 for i in cnew: |
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352 if (i.IsValid()): |
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353 newclip=self.__AllocClipRect() |
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354 newclip.bounds=i |
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355 newlist.AddRect(newclip) |
20 | 356 else: newlist.AddRect(p) |
0
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357 self.crects.StealRects(newlist) |
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358 |
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359 def __IncludeRect(self,rect): |
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360 tmprg=IRegion() |
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361 tmprg.__AddRect(rect) |
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362 p = self.crects.first |
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363 while p: |
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364 tmprg.__ExcludeRect(p.bounds) |
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365 p = p.next |
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366 self.crects.StealRects(tmprg.crects) |
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367 |
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368 def IncludeRect(self,rect): |
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369 tmprg = IRegion() |
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370 tmprg.Clear() |
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371 tmprg.__AddRect(rect) |
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372 self.__Examine(rect) |
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373 p= self.crects.first |
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374 while p: |
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375 tmprg.__Examine(p.bounds) |
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376 p=p.next |
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377 p=tmprg.crects.first |
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378 while p: |
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379 self.__IncludeRect(p.bounds) |
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380 p=p.next |
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381 self.Optimize() |
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382 |
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383 def IncludeRegion(self,regn): |
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384 tmprg = IRegion() |
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385 regn.Copy(tmprg) |
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386 p = self.crects.first |
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|
387 while p: |
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388 tmprg.__Examine(p.bounds) |
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389 p=p.next |
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390 p = tmprg.crects.first |
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391 while p: |
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392 self.__Examine(p.bounds) |
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393 self.__IncludeRect(p.bounds) |
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|
394 p = p.next |
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|
395 self.Optimize() |
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|
396 |
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397 def __ExcludeRect(self,rect): |
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398 newlist=ClipRectList() |
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399 while not (self.crects.first is None): |
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400 pcclip=self.crects.RemoveHead() |
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401 hide=rect.intersect(pcclip.bounds) |
20 | 402 if not hide.IsValid(): newlist.AddRect(pcclip) |
0
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403 else: |
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404 #make 4 new rectangles to replace the one taken out |
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405 # |
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406 # AAAAAAAAAAAA |
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407 # AAAAAAAAAAAA |
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408 # BBBB CCCC |
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409 # BBBB CCCC |
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410 # DDDDDDDDDDDD |
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411 # DDDDDDDDDDDD |
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412 # the center rectangle is the one to remove, rectangles A,B,C and D |
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413 # get created. If the rectangle is not in the middle, then the |
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414 # corresponding rectangle that should have been on "that side" of |
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415 # the current rectangle will have IsValid==False, so it will be |
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416 # rejected. |
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417 cnew=[IRect().make(pcclip.bounds.left,hide.top,hide.left-1,hide.bottom), |
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418 IRect().make(hide.right+1,hide.top,pcclip.bounds.right,hide.bottom), |
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419 IRect().make(pcclip.bounds.left,hide.bottom+1,pcclip.bounds.right,pcclip.bounds.bottom), |
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420 IRect().make(pcclip.bounds.left,pcclip.bounds.top,pcclip.bounds.right,hide.top-1) ] |
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421 self.__FreeClipRect(pcclip) |
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422 for i in cnew: |
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423 if (i.IsValid()): |
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424 newclip=self.__AllocClipRect() |
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425 newclip.bounds=i |
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426 newlist.AddRect(newclip) |
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427 self.crects.last=None |
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428 self.crects.StealRects(newlist) |
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429 self.Optimize() |
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430 |
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431 def ExcludeRect(self,rect): |
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432 self.__ExcludeRect(rect) |
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433 self.Optimize() |
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434 |
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|
435 def ExcludeRegion(self,reg): |
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436 pclist = reg.crects.first |
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437 while pclist: |
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438 self.__ExcludeRect(pclist.bounds) |
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439 pclist = pclist.next |
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|
440 self.Optimize() |
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parents:
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|
441 |
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|
442 def __IntersectRect(self,rect): |
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443 newlist=ClipRectList() |
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444 while not self.crects.first is None: |
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|
445 pcclip=self.crects.RemoveHead() |
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446 hide=rect.intersect(pcclip.bounds) |
20 | 447 if not hide.IsValid(): newlist.AddRect(pcclip) |
0
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|
448 else: |
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449 cnew=[IRect().make(pcclip.bounds.left,hide.top,hide.left-1,hide.bottom), |
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450 IRect().make(hide.right+1,hide.top,pcclip.bounds.right,hide.bottom), |
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|
451 IRect().make(pcclip.bounds.left,hide.bottom+1,pcclip.bounds.right,pcclip.bounds.bottom), |
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|
452 IRect().make(pcclip.bounds.left,pcclip.bounds.top,pcclip.bounds.right,hide.top-1) ] |
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453 self.__FreeClipRect(pcclip) |
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|
454 for i in cnew: |
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|
455 if (i.IsValid()): |
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|
456 newclip=self.__AllocClipRect() |
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|
457 newclip.bounds=i |
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|
458 newlist.AddRect(newclip) |
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459 self.crects.last = None |
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460 self.crects.StealRects(newlist) |
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|
461 |
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|
462 def IntersectRect(self,rect): |
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463 self.__IntersectRect(rect) |
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|
464 self.Optimize() |
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|
465 |
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|
466 def IntersectRegion(self,reg): |
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|
467 clist=ClipRectList() |
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468 pcvclip = reg.crects.first |
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|
469 while pcvclip: |
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470 pchclip = self.crects.first |
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|
471 while pchclip: |
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472 crect=pcvclip.bounds.intersect(pchclip.bounds) |
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|
473 if crect.IsValid(): |
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|
474 newclip=self.__AllocClipRect() |
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changeset
|
475 newclip.bounds=crect |
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|
476 clist.AddRect(newclip) |
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changeset
|
477 pchclip = pchclip.next |
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|
478 pcvclip = pcvclip.next |
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|
479 self.Clear() |
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|
480 self.crects.StealRects(clist) |
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|
481 self.Optimize() |
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|
482 |
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|
483 def GetBounds(self): |
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|
484 bounds=IRect() |
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changeset
|
485 pcclip = self.crects.first |
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|
486 while pcclip: |
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|
487 bounds=bounds.union(pcclip.bounds) |
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|
488 pcclip = pcclip.next |
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|
489 return bounds |
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|
490 |
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|
491 def Optimize(self): |
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492 clist=self.crects.GetList() |
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|
493 removed=[] |
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|
494 keepgoing = 1 |
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|
495 while len(clist)>1 and keepgoing: |
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|
496 keepgoing=0 |
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|
497 clist.sort(lambda a,b:_vSortCmp(a,b)) |
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498 keys=range(len(clist)-1) |
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|
499 keys.reverse() |
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|
500 for i in keys: |
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501 if (clist[i].bounds.right==clist[i+1].bounds.left-1 and |
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502 clist[i].bounds.top==clist[i+1].bounds.top and |
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|
503 clist[i].bounds.bottom==clist[i+1].bounds.bottom): |
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|
504 clist[i].bounds.right=clist[i+1].bounds.right |
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505 x=clist[i+1] |
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|
506 del clist[i+1] |
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507 self.crects.RemoveRect(x) |
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|
508 self.__FreeClipRect(x) |
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509 keepgoing=1 |
20 | 510 if len(clist)<=1: break |
0
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511 clist.sort(lambda a,b:_hSortCmp(a,b)) |
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512 keys=range(len(clist)-1) |
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513 keys.reverse() |
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514 for i in keys: |
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515 if (clist[i].bounds.bottom==clist[i+1].bounds.top-1 and |
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516 clist[i].bounds.left==clist[i+1].bounds.left and |
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517 clist[i].bounds.right==clist[i+1].bounds.right): |
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518 clist[i].bounds.bottom=clist[i+1].bounds.bottom |
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519 x=clist[i+1] |
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520 del clist[i+1] |
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521 self.crects.RemoveRect(x) |
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522 self.__FreeClipRect(x) |
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523 keepgoing=1 |
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524 |
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525 def FromPolygon(self,polypt,mode): |
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526 thelist=self.scan_Convert(polypt) |
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527 for i in thelist: |
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528 r=IRect().make(i.left,i.y,i.right,i.y) |
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529 if mode: |
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530 self.__Examine(r) |
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531 self.__IncludeRect(r) |
20 | 532 else: self.__ExcludeRect(r) |
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533 self.Optimize() |
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534 |
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535 def GetRectList(self): |
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536 result=[] |
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537 i = self.crects.first |
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538 while i: |
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539 result.append(i.bounds) |
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540 i = i.next |
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541 return result |
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542 |
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543 #Portable implementation to scan-convert a polygon |
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544 #from algoritm described in Section 3.6.3 of Foley, et al |
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545 #returns a (possibly redundant) list of spans that comprise the polygon |
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546 #this routine does not manipulate the current region in any way, but |
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547 #is enclosed in this class to isolate its name from the global namespace |
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548 #invoke via IRegion().scan_Convert(polypt) |
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549 |
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550 def scan_Convert(self,polypt): |
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551 result=[] |
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552 ET = {} # edge table |
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553 i = 0 |
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554 size = len(polypt) |
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555 polylines=[] # list of lines in polygon |
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556 y = -1 |
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557 for i in xrange(size): |
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558 n = (i+1) % size |
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559 if polypt[i].Y < polypt[n].Y: |
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560 e = Edge(polypt[i],polypt[n]) |
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561 e.dir = 1 #moving top to bottom |
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562 polylines.append(e) |
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563 elif polypt[i].Y > polypt[n].Y: |
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564 e = Edge(polypt[n],polypt[i]) |
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565 e.dir = -1 #moving bottom to top |
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566 polylines.append(e) |
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567 elif polypt[i].X != polypt[n].X: # any horizontal lines just get added directly |
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568 sx = min(polypt[i].X,polypt[n].X) |
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569 ex = max(polypt[i].X,polypt[n].X) |
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570 result.append(ISpan(sx,ex,polypt[i].Y)) |
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571 size = len(polylines) |
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572 for i in xrange(size): |
20 | 573 if i == 0 and polylines[i].dir == -1: n = size-1 |
574 elif (polylines[i].dir == -1): n = i-1 | |
575 else: n = (i+1) % size | |
576 if (polylines[i].dir != polylines[n].dir): polylines[i].bottom = 1 | |
577 if i == 0 or polylines[i].starty < y: y = polylines[i].starty | |
578 if not ET.has_key(polylines[i].starty): ET[polylines[i].starty] = [] | |
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579 ET[polylines[i].starty].append(polylines[i]) #add to edge table, indexed by smaller y coordinate |
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580 AET = [] #active edge table |
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581 while len(AET) > 0 or len(ET) > 0: |
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582 if ET.has_key(y): #if current y value has entries in edge tabe |
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583 AET.extend(ET[y]) # add them to active edge table |
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584 del ET[y] #and delete the entries in the edge table |
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585 i = len(AET)-1 |
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586 vals = [] |
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587 while i >= 0: |
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588 if (AET[i].endy == y): #if at the end of this edge's run |
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589 if (AET[i].bottom): #check and see if we need one more point |
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590 vals.append(AET[i].cx) #we do, add it |
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591 del AET[i] # y=end of edge, so remove it |
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592 i -= 1 |
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593 i = 0 |
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594 while i < len(AET): # for every edge in AET |
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595 vals.append(AET[i].cx) # add x intercept |
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596 AET[i].advance() #and advance the edge one down |
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597 i += 1 |
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598 vals.sort() |
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599 i = 0 |
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600 while i < len(vals)-1: #split vals[] array into pairs and output them |
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601 result.append(ISpan(vals[i],vals[i+1],y)) |
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602 i += 2 |
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603 y += 1 |
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604 return result |