The raster shade function applies a shader to a pixel at render time - typically used to render grayscale images as false color. More...

#include <qgsrastershaderfunction.h>

Inheritance diagram for QgsRasterShaderFunction:

[legend]

List of all members.

Public Member Functions
	QgsRasterShaderFunction (double theMinimumValue=0.0, double theMaximumValue=255.0)
virtual	~QgsRasterShaderFunction ()
virtual void	setMaximumValue (double)
	Set the maximum value.
virtual void	setMinimumValue (double)
	Return the minimum value.
virtual bool	shade (double, int , int , int *)
	generates and new RGB value based on one input value
virtual bool	shade (double, double, double, int , int , int *)
	generates and new RGB value based on original RGB value
double	minimumMaximumRange () const
double	minimumValue () const
double	maximumValue () const
Protected Attributes
double	mMaximumValue
	User defineable maximum value for the shading function.
double	mMinimumValue
	User defineable minimum value for the shading function.
double	mMinimumMaximumRange
	Minimum maximum range for the shading function.

Detailed Description

The raster shade function applies a shader to a pixel at render time - typically used to render grayscale images as false color.

Definition at line 27 of file qgsrastershaderfunction.h.

Constructor & Destructor Documentation

QgsRasterShaderFunction::QgsRasterShaderFunction	(	double	theMinimumValue = `0.0`,
		double	theMaximumValue = `255.0`
	)

Definition at line 22 of file qgsrastershaderfunction.cpp.

References mMaximumValue, mMinimumMaximumRange, mMinimumValue, and QgsDebugMsg.

virtual QgsRasterShaderFunction::~QgsRasterShaderFunction ( ) [inline, virtual]

Definition at line 32 of file qgsrastershaderfunction.h.

Member Function Documentation

double QgsRasterShaderFunction::maximumValue ( ) const [inline]

Definition at line 49 of file qgsrastershaderfunction.h.

Referenced by QgsRasterLayer::legendSymbologyItems().

double QgsRasterShaderFunction::minimumMaximumRange ( ) const [inline]

Definition at line 46 of file qgsrastershaderfunction.h.

double QgsRasterShaderFunction::minimumValue ( ) const [inline]

Definition at line 48 of file qgsrastershaderfunction.h.

void QgsRasterShaderFunction::setMaximumValue ( double theValue ) [virtual]

Set the maximum value.

Set the maximum value for the raster shader.

Parameters:

theValue The new maximum value

Reimplemented in QgsFreakOutShader, and QgsPseudoColorShader.

Definition at line 36 of file qgsrastershaderfunction.cpp.

References mMaximumValue, mMinimumMaximumRange, mMinimumValue, and QgsDebugMsg.

Referenced by QgsRasterShader::setMaximumValue().

void QgsRasterShaderFunction::setMinimumValue ( double theValue ) [virtual]

Return the minimum value.

Set the maximum value for the raster shader.

Parameters:

theValue The new minimum value

Reimplemented in QgsFreakOutShader, and QgsPseudoColorShader.

Definition at line 49 of file qgsrastershaderfunction.cpp.

References mMaximumValue, mMinimumMaximumRange, mMinimumValue, and QgsDebugMsg.

Referenced by QgsRasterShader::setMinimumValue().

bool QgsRasterShaderFunction::shade	(	double	theValue,
		int *	theReturnRedValue,
		int *	theReturnGreenValue,
		int *	theReturnBlueValue
	)		`[virtual]`

generates and new RGB value based on one input value

Generates and new RGB value based on one input value.

Parameters:

theValue	The original value to base a new RGB value on
theReturnRedValue	The red component of the new RGB value
theReturnGreenValue	The green component of the new RGB value
theReturnBlueValue	The blue component of the new RGB value

Returns:: True if the return values are valid otherwise false

Reimplemented in QgsColorRampShader, QgsFreakOutShader, and QgsPseudoColorShader.

Definition at line 66 of file qgsrastershaderfunction.cpp.

Referenced by QgsRasterShader::shade().

bool QgsRasterShaderFunction::shade	(	double	theRedValue,
		double	theGreenValue,
		double	theBlueValue,
		int *	theReturnRedValue,
		int *	theReturnGreenValue,
		int *	theReturnBlueValue
	)		`[virtual]`

generates and new RGB value based on original RGB value

Generates and new RGB value based on an original RGB value.

Parameters:

theRedValue	The red component of the original value to base a new RGB value on
theGreenValue	The green component of the original value to base a new RGB value on
theBlueValue	The blue component of the original value to base a new RGB value on
theReturnRedValue	The red component of the new RGB value
theReturnGreenValue	The green component of the new RGB value
theReturnBlueValue	The blue component of the new RGB value