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Nicer implementation of shadow functions.

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Should allow easier tweaking to truncate tails if needed.

svn path=/trunk/KDE/kdebase/workspace/; revision=1125530
This commit is contained in:
Hugo Pereira Da Costa 2010-05-11 16:56:00 +00:00
parent 2163f87264
commit 6d6c7a9810
2 changed files with 75 additions and 37 deletions
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55
clients/oxygen/oxygenshadowcache.cpp
View file

@ -183,21 +183,17 @@ namespace Oxygen
const qreal hoffset = shadowConfiguration.horizontalOffset()*gradientSize/fixedSize;
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
const qreal magnitude( 0.85 );
const qreal width( 0.17 );
QRadialGradient rg = QRadialGradient( size+12.0*hoffset, size+12.0*voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.85, 0.17 );
QColor c = shadowConfiguration.innerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
qreal value = magnitude*std::exp( -sqr(x/width) );
c.setAlphaF( value );
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
@ -214,21 +210,17 @@ namespace Oxygen
const qreal hoffset = shadowConfiguration.horizontalOffset()*gradientSize/fixedSize;
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
const qreal magnitude( 0.46 );
const qreal width( 0.34 );
QRadialGradient rg = QRadialGradient( size+12.0*hoffset, size+12.0*voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.46, 0.34 );
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
qreal value = magnitude*std::exp( -sqr(x/width) );
c.setAlphaF( value );
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
@ -246,21 +238,17 @@ namespace Oxygen
const qreal hoffset = shadowConfiguration.horizontalOffset()*gradientSize/fixedSize;
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
// parabolic shadow is used
int nPoints( (10*gradientSize)/fixedSize );
const qreal magnitude( 1.0 );
const qreal width( 21 );
QRadialGradient rg = QRadialGradient( size+hoffset, size+voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
// parabolic shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Parabolic f( 1.0, 0.22 );
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
qreal value = qMax( 0.0, magnitude*(1.0 -width*sqr(x) ) );
c.setAlphaF( value );
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
@ -279,20 +267,16 @@ namespace Oxygen
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
const qreal magnitude( 0.54 );
const qreal width(0.21);
QRadialGradient rg = QRadialGradient( size+8.0*hoffset, size+8.0*voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.54, 0.21);
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
qreal value = magnitude*std::exp( -sqr(x/width) );
c.setAlphaF( value );
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
@ -310,19 +294,16 @@ namespace Oxygen
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
const qreal magnitude( 0.155 );
const qreal width(0.445);
QRadialGradient rg = QRadialGradient( size+20.0*hoffset, size+20.0*voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.155, 0.445);
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
qreal value = magnitude*std::exp( -sqr(x/width) );
c.setAlphaF( value );
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}

57
clients/oxygen/oxygenshadowcache.h
View file

@ -30,6 +30,7 @@
#include "oxygendecohelper.h"
#include "oxygenshadowconfiguration.h"
#include <cmath>
#include <QtCore/QCache>
#include <QtGui/QRadialGradient>
@ -194,6 +195,62 @@ namespace Oxygen
DecoHelper& helper( void ) const
{ return helper_; }
//! square utility function
static qreal square( qreal x )
{ return x*x; }
//! functions used to draw shadows
class Parabolic
{
public:
//! constructor
Parabolic( qreal amplitude, qreal width ):
amplitude_( amplitude ),
width_( width )
{}
//! destructor
virtual ~Parabolic( void )
{}
//! value
virtual qreal operator() ( qreal x ) const
{ return qMax( 0.0, amplitude_*(1.0 - square(x/width_) ) ); }
private:
qreal amplitude_;
qreal width_;
};
//! functions used to draw shadows
class Gaussian
{
public:
//! constructor
Gaussian( qreal amplitude, qreal width ):
amplitude_( amplitude ),
width_( width )
{}
//! destructor
virtual ~Gaussian( void )
{}
//! value
virtual qreal operator() ( qreal x ) const
{ return amplitude_*std::exp( -square(x/width_) ); }
private:
qreal amplitude_;
qreal width_;
};
private:
//! draw gradient into rect