Mercurial > traipse_dev

annotate orpg/mapper/isometric.py @ 20:072ffc1d466f traipse_dev

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2nd attempt. Still untested.
author sirebral
date Sat, 25 Jul 2009 19:23:25 -0500
parents 4385a7d0efd1
children
rev   line source
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/isometric.py
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21 # Author: Todd Faris (Snowdog)
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22 # Maintainer:
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23 # Version:
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24 #
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25 # Description:
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26 # helper class definition for drawing and line collision within an isometric grid
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27 # based on a interger based coordinate system where X increase to the right
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28 # and Y increases in the downward direction
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29
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30
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31 class IsoGrid:
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32 def __init__(self,width):
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33 self.ratio = 2.0
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34 self.width = width
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35 self.height = 0
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36 self.CalcRatio()
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37 self.center_x = 0
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38 self.center_y = 0
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39
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40 def Ratio(self, r ):
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41 "changes the height/width ratio of the isometric rectangle with respect to the horizontal (x) axis"
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42 self.ratio = float(r)
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43 self.CalcRatio()
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44
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45 def CalcRatio(self):
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46 if (self.ratio <= 0): self.ratio = 1
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47 self.height = int( float(self.width)/float(self.ratio) )
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48
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49 def BoundPlace(self, left,top):
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50 "Places the isometric rectangle using its upper left bounding corner for positioning"
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51 dx,dy = self.CornerOffset()
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52 self.Recenter( left+dx, top+dy)
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53
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54 def Recenter(self,x,y):
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55 "Places the isomentric rectangle using the centerpoint"
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56 self.center_x = x
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57 self.center_y = y
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58
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59 def Top(self):
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60 "Returns the topmost point of the isometric rectangle as a tuple (x,y)"
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61 x = int(self.center_x)
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62 y = int(self.center_y) - int(self.height/2)
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63 return(x,y)
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64
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65 def Left(self):
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66 "Returns the leftmost point of the isometric rectangle as a tuple (x,y)"
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67 x = int(self.center_x) - int(self.width/2)
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68 y = int(self.center_y)
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69 return(x,y)
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70
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71 def Right(self):
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72 "Returns the rightmost point of the isometric rectangle as a tuple (x,y)"
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73 x,y = self.Left()
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74 x = x + self.width
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75 return(x,y)
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76
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77 def Bottom(self):
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78 "Returns the bottommost point of the isometric rectangle as a tuple (x,y)"
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79 x,y = self.Top()
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80 y = y + self.height
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81 return(x,y)
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82
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83 def Center(self):
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84 "Returns the center point of the isometric rectangle as a tuple (x,y)"
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85 x = int(self.center_x)
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86 y = int(self.center_y)
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87 return(x,y)
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88
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89 def CornerOffset(self):
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90 """Returns a tuple (delta_x,delta_y) representing the offset from the centerpoint
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91 of the isometric rectangle to the upper left corner of its rectangular bounding box"""
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92 dx = float(self.width/2)
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93 dy = float(self.height/2)
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94 return (dx,dy)
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95
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96 def Height(self):
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97 "Returns the height of the isometric rectangle based on current ratio"
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98 return int(self.height)
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99
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100 def Width(self):
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101 "returns the width of the isomentric rectangle"
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102 return int(self.width)