Mercurial > traipse_dev

annotate orpg/mapper/map_utils.py @ 81:65c212e9a5b4 ornery-dev

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Controls panel is completed. Users cannot delete branches nicely without a Merc upgrade, so that feature will appear in Pious Paladin. Crash report is being tested on windows.
author sirebral
date Wed, 26 Aug 2009 23:24:45 -0500
parents 449a8900f9ac
children
rev   line source
71
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
1 """
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
2 file: map_utils.py
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
3
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
4 This file contains generic utility functions
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
5 for use in the openrpg mapping system
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
6 """
0
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
7
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
8 import math
71
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
9 """
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
10 distance_between()
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
11 Returns the distance between two points
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
12 """
0
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
13 def distance_between( x1, y1, x2, y2 ):
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
14 "Returns the distance between two points"
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
15 dx = x2 - x1
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
16 dy = y2 - y1
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
17 return math.sqrt( dx*dx + dy*dy )
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
18
71
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
19 """
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
20 proximity_test()
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
21 Tests if 'test_point' (T) is close (within 'threshold' units) to the
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
22 line segment 'start_point' to 'end_point' (PQ).
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
23
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
24 The closest point (R) to T on the line PQ is given by:
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
25 R = P + u (Q - P)
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
26 TR is perpendicular to PQ so:
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
27 (T - R) dot (Q - P) = 0
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
28 Solving these two equations gives the equation for u (see below).
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
29
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
30 If u < 0 or u > 1 then R is not within the line segment and we simply
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
31 test against point P or Q.
449a8900f9ac Code refining almost completed, for this round. Some included files are still in need of some clean up, but this is test worthy.
sirebral
parents: 20
diff changeset
32 """
0
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
33 def proximity_test( start_point, end_point, test_point, threshold ):
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
34 "Test if a point is close to a line segment"
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
35 x1,y1 = start_point
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
36 x2,y2 = end_point
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
37 xt,yt = test_point
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
38 x1 = float(x1)
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
39 x2 = float(x2)
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
40 y1 = float(y1)
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
41 y2 = float(y2)
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
42 xt = float(xt)
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
43 yt = float(yt)
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
44
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
45 # Coincident points?
20
072ffc1d466f 2nd attempt. Still untested.
sirebral
parents: 0
diff changeset
46 if x1 == x2 and y1 == y2: d = distance_between(xt, yt, x1, y1)
0
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
47 else:
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
48 dx = x2 - x1
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
49 dy = y2 - y1
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
50 u = ((xt - x1) * dx + (yt - y1) * dy) / (dx*dx + dy*dy)
20
072ffc1d466f 2nd attempt. Still untested.
sirebral
parents: 0
diff changeset
51 if u < 0: d = distance_between(xt, yt, x1, y1)
072ffc1d466f 2nd attempt. Still untested.
sirebral
parents: 0
diff changeset
52 elif u > 1: d = distance_between(xt, yt, x2, y2)
0
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
53 else:
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
54 xr = x1 + u * dx
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
55 yr = y1 + u * dy
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
56 d = distance_between(xt, yt, xr, yr)
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
parents:
diff changeset
57 return d <= threshold