[Hgengine-cvs] SF.net SVN: hgengine:[685] Mercury2/src

[<cn...@us...>]

Revision: 685
          http://hgengine.svn.sourceforge.net/hgengine/?rev=685&view=rev
Author:   cnlohr
Date:     2010-03-03 09:07:37 +0000 (Wed, 03 Mar 2010)

Log Message:
-----------
add utility functions for new tweening template thingie that will be coming soon.

Modified Paths:
--------------
    Mercury2/src/MercuryUtil.cpp
    Mercury2/src/MercuryUtil.h

Modified: Mercury2/src/MercuryUtil.cpp
===================================================================
--- Mercury2/src/MercuryUtil.cpp	2010-03-03 08:51:22 UTC (rev 684)
+++ Mercury2/src/MercuryUtil.cpp	2010-03-03 09:07:37 UTC (rev 685)
@@ -3,6 +3,7 @@
 #include <Mint.h>
 #include <MercuryVector.h>
 #include <MercuryBacktrace.h>
+#include <math.h>
 
 #ifdef WIN32
 #include <Windows.h>
@@ -298,6 +299,34 @@
 #endif
 }
 
+float FLinear( float in, float slice )
+{
+	float fret = (in - 0.5) * slice;
+
+	if( fret > 0.5 ) fret = 0.5;
+	else if( fret < -0.5 ) fret = -0.5;
+	return fret + 0.5;
+}
+
+float FExponential( float in, float powx )
+{
+	return pow( in, powx );
+}
+
+float FStep( float in, float stepplace )
+{
+	return ( in < stepplace )?0:1;
+}
+
+float FSigmoid( float in, float fspeed )
+{
+	float fi = in - 0.5;
+	float fr = ( exp( fi * fspeed ) - 1 ) / ( exp( fi * fspeed ) + 1 );
+	float smax = ( exp( fspeed * 0.5 ) - 1 ) / ( exp( fspeed * 0.5 ) + 1 );
+	return (fr / smax) / 2. + 0.5;
+}
+
+
 /* Copyright (c) 2009, Joshua Allen and Charles Lohr
  * All rights reserved.
  *

Modified: Mercury2/src/MercuryUtil.h
===================================================================
--- Mercury2/src/MercuryUtil.h	2010-03-03 08:51:22 UTC (rev 684)
+++ Mercury2/src/MercuryUtil.h	2010-03-03 09:07:37 UTC (rev 685)
@@ -135,7 +135,19 @@
 MString ConvertToUnformatted( const MString & cf );
 
 ///millisecond sleep
-void msleep(uint32_t msec);
+void msleep(uint32_t msec);
+
+///Utility linear function, in = [0..1] out = [0..1]; respectively, if slice >= 1
+float FLinear( float in, float slice = 1. );
+
+///Utility exponential function, in = [0..1] out = [0..1]; respectively; regardless of pow.  If pow == 1, would be identical to linear.
+float FExponential( float in, float powx = 1. );
+
+///Utility step function; out = 0 when in < stepplace; out = 1 when in >= stepplace
+float FStep( float in, float stepplace = 1. );
+
+///Utility sigmoid function; in = [0..1] out = [0..1]; speed is the slope of change in the middle.
+float FSigmoid( float in, float fspeed = 1. );
 
 #endif
 


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