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annotate orpg/mapper/map_utils.py @ 122:36919b8a3ef9 alpha

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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
date Sat, 31 Oct 2009 22:07:55 -0500
parents 449a8900f9ac
children
rev   line source
71
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1 """
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2 file: map_utils.py
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3
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4 This file contains generic utility functions
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5 for use in the openrpg mapping system
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6 """
0
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7
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8 import math
71
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9 """
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10 distance_between()
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11 Returns the distance between two points
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12 """
0
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13 def distance_between( x1, y1, x2, y2 ):
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14 "Returns the distance between two points"
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15 dx = x2 - x1
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16 dy = y2 - y1
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17 return math.sqrt( dx*dx + dy*dy )
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18
71
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19 """
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20 proximity_test()
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21 Tests if 'test_point' (T) is close (within 'threshold' units) to the
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22 line segment 'start_point' to 'end_point' (PQ).
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23
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24 The closest point (R) to T on the line PQ is given by:
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25 R = P + u (Q - P)
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26 TR is perpendicular to PQ so:
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27 (T - R) dot (Q - P) = 0
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28 Solving these two equations gives the equation for u (see below).
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29
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30 If u < 0 or u > 1 then R is not within the line segment and we simply
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31 test against point P or Q.
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32 """
0
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33 def proximity_test( start_point, end_point, test_point, threshold ):
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34 "Test if a point is close to a line segment"
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35 x1,y1 = start_point
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36 x2,y2 = end_point
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37 xt,yt = test_point
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38 x1 = float(x1)
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39 x2 = float(x2)
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40 y1 = float(y1)
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41 y2 = float(y2)
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42 xt = float(xt)
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43 yt = float(yt)
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44
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45 # Coincident points?
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46 if x1 == x2 and y1 == y2: d = distance_between(xt, yt, x1, y1)
0
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47 else:
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48 dx = x2 - x1
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49 dy = y2 - y1
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50 u = ((xt - x1) * dx + (yt - y1) * dy) / (dx*dx + dy*dy)
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51 if u < 0: d = distance_between(xt, yt, x1, y1)
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52 elif u > 1: d = distance_between(xt, yt, x2, y2)
0
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53 else:
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54 xr = x1 + u * dx
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55 yr = y1 + u * dy
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56 d = distance_between(xt, yt, xr, yr)
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57 return d <= threshold