Fix 1684240 (as it applies to conical gradients): Conical Gradient layers suffer...

[synfig.git] / synfig-core / trunk / src / modules / mod_gradient / conicalgradient.cpp

diff --git a/synfig-core/trunk/src/modules/mod_gradient/conicalgradient.cpp b/synfig-core/trunk/src/modules/mod_gradient/conicalgradient.cpp
index 69a04c7..c4c2e62 100644 (file)
--- a/synfig-core/trunk/src/modules/mod_gradient/conicalgradient.cpp
+++ b/synfig-core/trunk/src/modules/mod_gradient/conicalgradient.cpp
@@ -2,7 +2,7 @@
 /*!    \file conicalgradient.cpp
 **     \brief Template Header
 **
-**     $Id: conicalgradient.cpp,v 1.1.1.1 2005/01/04 01:23:10 darco Exp $
+**     $Id$
 **
 **     \legal
 **     Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
@@ -56,7 +56,7 @@ SYNFIG_LAYER_SET_NAME(ConicalGradient,"conical_gradient");
 SYNFIG_LAYER_SET_LOCAL_NAME(ConicalGradient,_("Conical Gradient"));
 SYNFIG_LAYER_SET_CATEGORY(ConicalGradient,_("Gradients"));
 SYNFIG_LAYER_SET_VERSION(ConicalGradient,"0.1");
-SYNFIG_LAYER_SET_CVS_ID(ConicalGradient,"$Id: conicalgradient.cpp,v 1.1.1.1 2005/01/04 01:23:10 darco Exp $");
+SYNFIG_LAYER_SET_CVS_ID(ConicalGradient,"$Id$");
 
 /* === P R O C E D U R E S ================================================= */
 
@@ -168,14 +168,18 @@ ConicalGradient::color_func(const Point &pos, float supersample)const
 */
        if(dist+supersample*0.5>1.0)
        {
-               Color pool(gradient(dist,supersample*0.5).premult_alpha()*(1.0-(dist-supersample*0.5)));
-               pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5).premult_alpha()*((dist+supersample*0.5)-1.0);
+               float  left(supersample*0.5-(dist-1.0));
+               float right(supersample*0.5+(dist-1.0));
+               Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
+               pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
                return pool.demult_alpha();
        }
        if(dist-supersample*0.5<0.0)
        {
-               Color pool(gradient(dist,supersample*0.5).premult_alpha()*(dist+supersample*0.5));
-               pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5).premult_alpha()*(-(dist-supersample*0.5));
+               float  left(supersample*0.5-dist);
+               float right(supersample*0.5+dist);
+               Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
+               pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
                return pool.demult_alpha();
        }