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qgsrastertransparency.cpp
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qgsrastertransparency.cpp
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/* **************************************************************************
qgsrastertransparency.cpp - description
-------------------
begin : Mon Nov 30 2007
copyright : (C) 2007 by Peter J. Ersts
email : ersts@amnh.org
****************************************************************************/
/* **************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsrastertransparency.h"
#include "qgis.h"
#include <QDomDocument>
#include <QDomElement>
QgsRasterTransparency::QgsRasterTransparency()
{
}
/**
Accessor for transparentSingleValuePixelList
*/
QList<QgsRasterTransparency::TransparentSingleValuePixel> QgsRasterTransparency::transparentSingleValuePixelList() const
{
return mTransparentSingleValuePixelList;
}
/**
Accessor for transparentThreeValuePixelList
*/
QList<QgsRasterTransparency::TransparentThreeValuePixel> QgsRasterTransparency::transparentThreeValuePixelList() const
{
return mTransparentThreeValuePixelList;
}
/**
Reset to the transparency list to a single value
*/
void QgsRasterTransparency::initializeTransparentPixelList( double theValue )
{
//clear the existing list
mTransparentSingleValuePixelList.clear();
//add the initial value
TransparentSingleValuePixel myTransparentSingleValuePixel;
myTransparentSingleValuePixel.pixelValue = theValue;
myTransparentSingleValuePixel.percentTransparent = 100.0;
mTransparentSingleValuePixelList.append( myTransparentSingleValuePixel );
}
/**
Reset to the transparency list to a single value
*/
void QgsRasterTransparency::initializeTransparentPixelList( double theRedValue, double theGreenValue, double theBlueValue )
{
//clearn the existing list
mTransparentThreeValuePixelList.clear();
//add the initial values
TransparentThreeValuePixel myTransparentThreeValuePixel;
myTransparentThreeValuePixel.red = theRedValue;
myTransparentThreeValuePixel.green = theGreenValue;
myTransparentThreeValuePixel.blue = theBlueValue;
myTransparentThreeValuePixel.percentTransparent = 100.0;
mTransparentThreeValuePixelList.append( myTransparentThreeValuePixel );
}
/**
Mutator for transparentSingleValuePixelList, replaces the whole list
*/
void QgsRasterTransparency::setTransparentSingleValuePixelList( QList<QgsRasterTransparency::TransparentSingleValuePixel> theNewList )
{
mTransparentSingleValuePixelList = theNewList;
}
/**
Mutator for transparentThreeValuePixelList, replaces the whole list
*/
void QgsRasterTransparency::setTransparentThreeValuePixelList( QList<QgsRasterTransparency::TransparentThreeValuePixel> theNewList )
{
mTransparentThreeValuePixelList = theNewList;
}
/**
Searches through the transparency list, if a match is found, the global transparency value is scaled
by the stored transparency value.
@param theValue the needle to search for in the transparency hay stack
@param theGlobalTransparency the overal transparency level for the layer
*/
int QgsRasterTransparency::alphaValue( double theValue, int theGlobalTransparency ) const
{
//if NaN return 0, transparent
if ( theValue != theValue )
{
return 0;
}
//Search through the transparency list looking for a match
bool myTransparentPixelFound = false;
TransparentSingleValuePixel myTransparentPixel = {0, 100};
for ( int myListRunner = 0; myListRunner < mTransparentSingleValuePixelList.count(); myListRunner++ )
{
myTransparentPixel = mTransparentSingleValuePixelList[myListRunner];
if ( myTransparentPixel.pixelValue == theValue )
{
myTransparentPixelFound = true;
break;
}
}
//if a match was found use the stored transparency percentage
if ( myTransparentPixelFound )
{
return ( int )(( float )theGlobalTransparency *( 1.0 - ( myTransparentPixel.percentTransparent / 100.0 ) ) );
}
return theGlobalTransparency;
}
/**
Searches through the transparency list, if a match is found, the global transparency value is scaled
by the stored transparency value.
@param theRedValue the red portion of the needle to search for in the transparency hay stack
@param theGreenValue the green portion of the needle to search for in the transparency hay stack
@param theBlueValue the green portion of the needle to search for in the transparency hay stack
@param theGlobalTransparency the overal transparency level for the layer
*/
int QgsRasterTransparency::alphaValue( double theRedValue, double theGreenValue, double theBlueValue, int theGlobalTransparency ) const
{
//if NaN return 0, transparent
if ( theRedValue != theRedValue || theGreenValue != theGreenValue || theBlueValue != theBlueValue )
{
return 0;
}
//Search through the transparency list looking for a match
bool myTransparentPixelFound = false;
TransparentThreeValuePixel myTransparentPixel = {0, 0, 0, 100};
for ( int myListRunner = 0; myListRunner < mTransparentThreeValuePixelList.count(); myListRunner++ )
{
myTransparentPixel = mTransparentThreeValuePixelList[myListRunner];
if ( myTransparentPixel.red == theRedValue )
{
if ( myTransparentPixel.green == theGreenValue )
{
if ( myTransparentPixel.blue == theBlueValue )
{
myTransparentPixelFound = true;
break;
}
}
}
}
//if a match was found use the stored transparency percentage
if ( myTransparentPixelFound )
{
return ( int )(( float )theGlobalTransparency *( 1.0 - ( myTransparentPixel.percentTransparent / 100.0 ) ) );
}
return theGlobalTransparency;
}
bool QgsRasterTransparency::isEmpty( double nodataValue ) const
{
return (
( mTransparentSingleValuePixelList.isEmpty() ||
( mTransparentSingleValuePixelList.size() == 1 && doubleNear( mTransparentSingleValuePixelList.at( 0 ).pixelValue, nodataValue ) ) )
&&
( mTransparentThreeValuePixelList.isEmpty() ||
( mTransparentThreeValuePixelList.size() < 4 && doubleNear( mTransparentThreeValuePixelList.at( 0 ).red, nodataValue ) &&
doubleNear( mTransparentThreeValuePixelList.at( 0 ).green, nodataValue ) && doubleNear( mTransparentThreeValuePixelList.at( 0 ).blue, nodataValue ) ) ) );
}
void QgsRasterTransparency::writeXML( QDomDocument& doc, QDomElement& parentElem ) const
{
QDomElement rasterTransparencyElem = doc.createElement( "rasterTransparency" );
if ( mTransparentSingleValuePixelList.count() > 0 )
{
QDomElement singleValuePixelListElement = doc.createElement( "singleValuePixelList" );
QList<QgsRasterTransparency::TransparentSingleValuePixel>::const_iterator it = mTransparentSingleValuePixelList.constBegin();
for ( ; it != mTransparentSingleValuePixelList.constEnd(); ++it )
{
QDomElement pixelListElement = doc.createElement( "pixelListEntry" );
pixelListElement.setAttribute( "pixelValue", QString::number( it->pixelValue, 'f' ) );
pixelListElement.setAttribute( "percentTransparent", QString::number( it->percentTransparent ) );
singleValuePixelListElement.appendChild( pixelListElement );
}
rasterTransparencyElem.appendChild( singleValuePixelListElement );
}
if ( mTransparentThreeValuePixelList.count() > 0 )
{
QDomElement threeValuePixelListElement = doc.createElement( "threeValuePixelList" );
QList<QgsRasterTransparency::TransparentThreeValuePixel>::const_iterator it = mTransparentThreeValuePixelList.constBegin();
for ( ; it != mTransparentThreeValuePixelList.constEnd(); ++it )
{
QDomElement pixelListElement = doc.createElement( "pixelListEntry" );
pixelListElement.setAttribute( "red", QString::number( it->red, 'f' ) );
pixelListElement.setAttribute( "green", QString::number( it->green, 'f' ) );
pixelListElement.setAttribute( "blue", QString::number( it->blue, 'f' ) );
pixelListElement.setAttribute( "percentTransparent", QString::number( it->percentTransparent ) );
threeValuePixelListElement.appendChild( pixelListElement );
}
rasterTransparencyElem.appendChild( threeValuePixelListElement );
}
parentElem.appendChild( rasterTransparencyElem );
}
void QgsRasterTransparency::readXML( const QDomElement& elem )
{
if ( elem.isNull() )
{
return;
}
mTransparentSingleValuePixelList.clear();
mTransparentThreeValuePixelList.clear();
QDomElement currentEntryElem;
QDomElement singlePixelListElem = elem.firstChildElement( "singleValuePixelList" );
if ( !singlePixelListElem.isNull() )
{
QDomNodeList entryList = singlePixelListElem.elementsByTagName( "pixelListEntry" );
TransparentSingleValuePixel sp;
for ( int i = 0; i < entryList.size(); ++i )
{
currentEntryElem = entryList.at( i ).toElement();
sp.percentTransparent = currentEntryElem.attribute( "percentTransparent" ).toDouble();
sp.pixelValue = currentEntryElem.attribute( "pixelValue" ).toDouble();
mTransparentSingleValuePixelList.append( sp );
}
}
QDomElement threeValuePixelListElem = elem.firstChildElement( "threeValuePixelList" );
if ( !threeValuePixelListElem.isNull() )
{
QDomNodeList entryList = threeValuePixelListElem.elementsByTagName( "pixelListEntry" );
TransparentThreeValuePixel tp;
for ( int i = 0; i < entryList.size(); ++i )
{
currentEntryElem = entryList.at( i ).toElement();
tp.red = currentEntryElem.attribute( "red" ).toDouble();
tp.green = currentEntryElem.attribute( "green" ).toDouble();
tp.blue = currentEntryElem.attribute( "blue" ).toDouble();
tp.percentTransparent = currentEntryElem.attribute( "percentTransparent" ).toDouble();
mTransparentThreeValuePixelList.append( tp );
}
}
}