/*! \file spiralgradient.cpp
** \brief Template Header
**
-** $Id: spiralgradient.cpp,v 1.1.1.1 2005/01/04 01:23:11 darco Exp $
+** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
SYNFIG_LAYER_SET_LOCAL_NAME(SpiralGradient,_("Spiral Gradient"));
SYNFIG_LAYER_SET_CATEGORY(SpiralGradient,_("Gradients"));
SYNFIG_LAYER_SET_VERSION(SpiralGradient,"0.1");
-SYNFIG_LAYER_SET_CVS_ID(SpiralGradient,"$Id: spiralgradient.cpp,v 1.1.1.1 2005/01/04 01:23:11 darco Exp $");
+SYNFIG_LAYER_SET_CVS_ID(SpiralGradient,"$Id$");
/* === P R O C E D U R E S ================================================= */
clockwise(false)
{
}
-
+
bool
SpiralGradient::set_param(const String & param, const ValueBase &value)
{
IMPORT(radius);
IMPORT(angle);
IMPORT(clockwise);
-
+
return Layer_Composite::set_param(param,value);
}
EXPORT(radius);
EXPORT(angle);
EXPORT(clockwise);
-
+
EXPORT_NAME();
EXPORT_VERSION();
-
- return Layer_Composite::get_param(param);
+
+ return Layer_Composite::get_param(param);
}
Layer::Vocab
SpiralGradient::get_param_vocab()const
{
Layer::Vocab ret(Layer_Composite::get_param_vocab());
-
+
ret.push_back(ParamDesc("gradient")
.set_local_name(_("Gradient"))
);
ret.push_back(ParamDesc("center")
.set_local_name(_("Center"))
);
-
+
ret.push_back(ParamDesc("radius")
.set_local_name(_("Radius"))
.set_description(_("This is the radius of the circle"))
ret.push_back(ParamDesc("clockwise")
.set_local_name(_("Clockwise"))
);
-
+
return ret;
}
Angle a;
a=Angle::tan(-centered[1],centered[0]).mod();
a=a+angle;
-
+
if(supersample<0.00001)supersample=0.00001;
-
+
Real dist((pos-center).mag()/radius);
if(clockwise)
dist+=Angle::rot(a.mod()).get();
else
dist-=Angle::rot(a.mod()).get();
-
+
dist-=floor(dist);
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();
}
-
+
return gradient(dist,supersample);
}
SpiralGradient::get_color(Context context, const Point &pos)const
{
const Color color(color_func(pos));
-
+
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
return color;
else
return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
}
-
+
bool
SpiralGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
{
return true;
}
-
+
int x,y;
Surface::pen pen(surface->begin());
Point tl(renddesc.get_tl());
const int w(surface->get_w());
const int h(surface->get_h());
-
+
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
{
for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)