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annotate orpg/mapper/map_utils.py @ 199:0ccfb8836b81 alpha

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Traipse Alpha 'OpenRPG' {100427-00} 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 (Patch-2) New Features: New Namespace method with two new syntaxes New Namespace Internal is context sensitive, always! New Namespace External is 'as narrow as you make it' New Namespace FutureCheck helps ensure you don't receive an incorrect node New PluginDB access for URL2Link plugin New to Forms, they now show their content in Design Mode Fixes: Fix to Server GUI startup errors Fix to Server GUI Rooms tab updating Fix to Chat and Settings if non existant die roller is picked Fix to Dieroller and .open() used with .vs(). Successes are correctly calculated Fix to Alias Lib's Export to Tree, Open, Save features Fix to alias node, now works properly Fix to Splitter node, minor GUI cleanup Fix to Backgrounds not loading through remote loader Fix to Node name errors Fix to rolling dice in chat Whispers Fix to Splitters Sizing issues Fix to URL2Link plugin, modified regex compilation should remove memory leak Fix to mapy.py, a roll back due to zoomed grid issues Fix to whiteboard_handler, Circles work by you clicking the center of the circle
author sirebral
date Tue, 27 Apr 2010 00:58:29 -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