/traderous

To get this branch, use:
bzr branch /bzr/traderous

« back to all changes in this revision

Viewing changes to main.lua

  • Committer: Josh C
  • Date: 2013-06-23 02:06:35 UTC
  • Revision ID: josh@9ix.org-20130623020635-31ov2mbrb67xe0h0
more mirror cleanup

Show diffs side-by-side

added added

removed removed

main.lua
28
28
                  return -1
29
29
               end
30
30
            end,
31
 
   shortestVector = function(from, to)
32
 
                       if STRICT then
33
 
                          if from.x < the.app.width / 2 or
34
 
                             from.x > the.bg.width - the.app.width / 2 or
35
 
                             from.y < the.app.height / 2 or
36
 
                             from.y > the.bg.height - the.app.height / 2 then
37
 
                             error('"from" coordinate out of bounds: X='..from.x..' Y='..from.y)
38
 
                          end
39
 
 
40
 
                          if to.x < the.app.width / 2 or
41
 
                             to.x > the.bg.width - the.app.width / 2 or
42
 
                             to.y < the.app.height / 2 or
43
 
                             to.y > the.bg.height - the.app.height / 2 then
44
 
                             error('"to" coordinate out of bounds: X='..to.x..' Y='..to.y)
45
 
                          end
46
 
                       end
47
 
 
48
 
                       -- normalize grid to account for mirror zones
49
 
                       local fx = from.x - the.app.width / 2
50
 
                       local fy = from.y - the.app.height / 2
51
 
                       local tx = to.x - the.app.width / 2
52
 
                       local ty = to.y - the.app.height / 2
53
 
 
54
 
                       local short = {}
55
 
 
56
 
                       -- pick shorter x
57
 
                       if math.abs(tx - fx) < math.abs(tx - fx - (the.bg.width - the.app.width)) then
58
 
                          -- straight path is shorter
59
 
                          short.x = tx - fx
60
 
                       else
61
 
                          short.x = tx - fx - (the.bg.width - the.app.width)
62
 
                       end
63
 
 
64
 
                       -- pick shorter y
65
 
                       if math.abs(ty - fy) < math.abs(ty - fy - (the.bg.height - the.app.height)) then
66
 
                          -- straight path is shorter
67
 
                          short.y = ty - fy
68
 
                       else
69
 
                          short.y = ty - fy - (the.bg.height - the.app.height)
70
 
                       end
71
 
 
72
 
                       return vector.new(short.x, short.y)
73
 
                    end
74
31
}
75
32
 
76
33
GameView = View:extend {