Talk:Field of Vision

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(Simple and accurate LOS function)
(Cut new code (preparing to paste))
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:As I understand it, field of vision is an algorithm for determining everything is visible. Line of sight is about determining whether a particular square is visible. The former can be created with the latter, but it may be inefficient to do it that way. [[User:Duerig|Duerig]] 20:44, 23 Apr 2007 (CEST)
 
:As I understand it, field of vision is an algorithm for determining everything is visible. Line of sight is about determining whether a particular square is visible. The former can be created with the latter, but it may be inefficient to do it that way. [[User:Duerig|Duerig]] 20:44, 23 Apr 2007 (CEST)
  
== Simple and accurate LOS function ==
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Gbox, I am moving your code. It needs its own article rather than being hidden in a talk page somewhere. [[User:Duerig|Duerig]] 07:36, 12 June 2008 (CEST)
 
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<pre><nowiki>
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'// Code is [http://www.Blitzbasic.com BlitzMax]
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Function UpdateLOS(m:tMonster, UpdateMap:Int = True)
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If m = Null Then RuntimeError("Null in LOScheck!")
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Local XX:Int, YY:Int '// Clear LOS flag from previous //
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For xx = 0 To MAPWIDTH - 1
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For yy = 0 To MAPHEIGHT - 1
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If Map[xx, yy].InLOS = True Then
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Map[xx, yy].HasSeen = True '// HasSeen cells are marked dark
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Map[xx, yy].InLOS = False
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EndIf
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Next
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Next
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For Local angle:Float = 1 To 360 Step 0.18 '// fractional amount gives better resolution [0.1 causes sight though doors, > 0.2 creates gaps. 0.18 seems the sweet spot
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Local dist:Int = 0
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Local x:Float = Float(m.X) + 0.5 '//M.x and M.y are player/monster current map location
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Local y:Float = Float(m.y) + 0.5
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Local xmove:Float = Cos(angle)
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Local ymove:Float = Sin(angle)
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Repeat
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x = x + xmove
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y = y + ymove
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dist = dist + 1
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If dist >= m.Vision Then Exit  '// M.vision is the range of sight
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If X >= MAPWIDTH Then Exit
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If y >= MAPHEIGHT Then Exit
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If x < 0 Then Exit
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If y < 0 Then Exit
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Map[x, y].InLOS = True
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If Map[x, y].BlockVision Then Exit '// Map[,].Blockvision is for walls/closed doors ect
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Forever
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Next
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End Function
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</nowiki></pre>
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Revision as of 07:36, 12 June 2008

Anyone cares to clarify what is the difference between Field of Vision and Line of Sight??? --Slash 18:08, 8 Apr 2006 (CEST)

As I understand it, field of vision is an algorithm for determining everything is visible. Line of sight is about determining whether a particular square is visible. The former can be created with the latter, but it may be inefficient to do it that way. Duerig 20:44, 23 Apr 2007 (CEST)

Gbox, I am moving your code. It needs its own article rather than being hidden in a talk page somewhere. Duerig 07:36, 12 June 2008 (CEST)

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