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annotate orpg/mapper/map_utils.py @ 236:9230a33defd9 beta

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Traipse Beta 'OpenRPG' {100616-00} 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 (Closing/Closed) New Features: New to Map, can re-order Grid, Miniatures, and Whiteboard layer draw order New to Server GUI, can now clear log Updates: Update to Warhammer PC Sheet. Rollers set as macros. Should work with little maintanence. Update to Browser Server window. Display rooms with ' " & cleaner Update to Server. Handles ' " & cleaner. Fixes: Fix to InterParse that was causing an Infernal Loop with Namespace Internal Fix to XML data, removed old Minidom and switched to Element Tree Fix to Server that was causing eternal attempt to find a Server ID, in Register Rooms thread Fix to metaservers.xml file not being created Fix to Single and Double quotes in Whiteboard text Fix to Background images not showing when using the Image Server Fix to Duplicate chat names appearing Fix to Server GUI's logging output Fix to FNB.COLORFUL_TABS bug.
author sirebral
date Wed, 16 Jun 2010 03:06:20 -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
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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