X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_particle%2Frandom.cpp;h=783a34c5c34d4f343350102effd24ee650ab9abd;hb=ba4f6a9c499c64ebca84279cc44bf6449fd245c1;hp=f2950d7704240e4935027b8e49fefb8b47a7e633;hpb=70bcefce2ab011a11014f36fc129b473cc0bc61e;p=synfig.git

diff --git a/synfig-core/trunk/src/modules/mod_particle/random.cpp b/synfig-core/trunk/src/modules/mod_particle/random.cpp
index f2950d7..783a34c 100644
--- a/synfig-core/trunk/src/modules/mod_particle/random.cpp
+++ b/synfig-core/trunk/src/modules/mod_particle/random.cpp
@@ -2,7 +2,7 @@
 /*!	\file mod_particle/random.cpp
 **	\brief blehh
 **
-**	$Id: random.cpp,v 1.1.1.1 2005/01/04 01:23:14 darco Exp $
+**	$Id$
 **
 **	\legal
 **	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
@@ -57,6 +57,10 @@ Random::set_seed(int x)
 	t_mask=rand()+rand()*RAND_MAX;
 }
 
+// this picks one of the POOL_SIZE (256) preset values out of the pool
+// and scales it to be in the range (-1, 1).  is that what it was
+// intended to do?  the distribution is pretty terrible, too, with
+// some elements being picked a hundred times more often than others
 float
 Random::operator()(const int salt,const int x,const int y,const int t)const
 {
@@ -70,7 +74,7 @@ Random::operator()(const int salt,const int x,const int y,const int t)const
 }
 
 float
-Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
+Random::operator()(SmoothType smooth,int subseed,float xf,float yf,float tf)const
 {
 	int x((int)floor(xf));
 	int y((int)floor(yf));
@@ -78,10 +82,11 @@ Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
 
 	switch(smooth)
 	{
-	case 4:	// cubic
+	case SMOOTH_CUBIC:	// cubic
 		{
 			#define f(j,i,k)	((*this)(subseed,i,j,k))
 			//Using catmull rom interpolation because it doesn't blur at all
+			// ( http://www.gamedev.net/reference/articles/article1497.asp )
 			//bezier curve with intermediate ctrl pts: 0.5/3(p(i+1) - p(i-1)) and similar
 			float xfa [4], tfa[4];
 
@@ -138,7 +143,7 @@ Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
 		break;
 
 
-	case 5:	// Fast Spline (non-animated)
+	case SMOOTH_FAST_SPLINE:	// Fast Spline (non-animated)
 		{
 #define P(x)	(((x)>0)?((x)*(x)*(x)):0.0f)
 #define R(x)	( P(x+2) - 4.0f*P(x+1) + 6.0f*P(x) - 4.0f*P(x-1) )*(1.0f/6.0f)
@@ -146,8 +151,8 @@ Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
 #define FT(i,j,k)	((*this)(subseed,i+x,j+y,k+t)*(R((i)-a)*R(b-(j))*R((k)-c)))
 #define Z(i,j) ret+=F(i,j)
 #define ZT(i,j,k) ret+=FT(i,j,k)
-#define X(i,j)	// placeholder... To make box more symetric
-#define XT(i,j,k)	// placeholder... To make box more symetric
+#define X(i,j)	// placeholder... To make box more symmetric
+#define XT(i,j,k)	// placeholder... To make box more symmetric
 
 		float a(xf-x), b(yf-y);
 
@@ -161,7 +166,7 @@ Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
 		return ret;
 	}
 
-	case 3:	// Spline (animated)
+	case SMOOTH_SPLINE:	// Spline (animated)
 		{
 			float a(xf-x), b(yf-y), c(tf-t);
 
@@ -211,7 +216,7 @@ Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
 #undef P
 #undef R
 
-	case 2:	// Cosine
+	case SMOOTH_COSINE:
 	if((float)t==tf)
 	{
 		int x((int)floor(xf));
@@ -258,7 +263,7 @@ Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
 			(*this)(subseed,x,y2,t2)*(d*b*c)+
 			(*this)(subseed,x2,y2,t2)*(a*b*c);
 	}
-	case 1: // Linear
+	case SMOOTH_LINEAR:
 	if((float)t==tf)
 	{
 		int x((int)floor(xf));
@@ -298,7 +303,7 @@ Random::operator()(int smooth,int subseed,float xf,float yf,float tf)const
 			(*this)(subseed,x2,y2,t2)*(a*b*c);
 	}
 	default:
-	case 0:
+	case SMOOTH_DEFAULT:
 		return (*this)(subseed,x,y,t);
 	}
 }