[Patchanim-commit] SF.net SVN: patchanim: [211] trunk/patchanim/src/com/mebigfatguy/patchanim/ surface/PatchGenerator.java

[<dbr...@us...>]

Revision: 211
          http://patchanim.svn.sourceforge.net/patchanim/?rev=211&view=rev
Author:   dbrosius
Date:     2008-02-17 23:51:42 -0800 (Sun, 17 Feb 2008)

Log Message:
-----------
fix roll of negative values

Modified Paths:
--------------
    trunk/patchanim/src/com/mebigfatguy/patchanim/surface/PatchGenerator.java

Modified: trunk/patchanim/src/com/mebigfatguy/patchanim/surface/PatchGenerator.java
===================================================================
--- trunk/patchanim/src/com/mebigfatguy/patchanim/surface/PatchGenerator.java	2008-02-18 07:40:54 UTC (rev 210)
+++ trunk/patchanim/src/com/mebigfatguy/patchanim/surface/PatchGenerator.java	2008-02-18 07:51:42 UTC (rev 211)
@@ -146,10 +146,18 @@
 			
 			case Roll:
 				int period = value / 256;
-				if ((period & 0x01)  != 0)
-					value = 255 - value & 0x00FF;
-				else
-					value = value & 0x00FF;
+				if ((period & 0x01)  != 0) {
+					if (value > 0)
+						value = 255 - (value+1) & 0x00FF;
+					else
+						value = value & 0x00FF;
+				}
+				else {
+					if (value > 0)
+						value = value & 0x00FF;
+					else
+						value = 256 - value & 0x00FF;
+				}
 			break;
 		}
 		


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