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/*=========================================================================
Program: Visualization Toolkit
Module: vtkWindowLevelLookupTable.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/**
* @class vtkWindowLevelLookupTable
* @brief map scalar values into colors or colors to scalars; generate color table
*
* vtkWindowLevelLookupTable is an object that is used by mapper objects
* to map scalar values into rgba (red-green-blue-alpha transparency)
* color specification, or rgba into scalar values. The color table can
* be created by direct insertion of color values, or by specifying a
* window and level. Window / Level is used in medical imaging to specify
* a linear greyscale ramp. The Level is the center of the ramp. The
* Window is the width of the ramp.
*
* @warning
* vtkWindowLevelLookupTable is a reference counted object. Therefore, you
* should always use operator "new" to construct new objects. This procedure
* will avoid memory problems (see text).
*
* @sa
* vtkLogLookupTable
*/
#ifndef vtkWindowLevelLookupTable_h
#define vtkWindowLevelLookupTable_h
#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkLookupTable.h"
class VTKRENDERINGCORE_EXPORT vtkWindowLevelLookupTable : public vtkLookupTable
{
public:
static vtkWindowLevelLookupTable *New();
vtkTypeMacro(vtkWindowLevelLookupTable,vtkLookupTable);
void PrintSelf(ostream& os, vtkIndent indent);
/**
* Generate lookup table as a linear ramp between MinimumTableValue
* and MaximumTableValue.
*/
void Build();
//@{
/**
* Set the window for the lookup table. The window is the difference
* between TableRange[0] and TableRange[1].
*/
void SetWindow(double window) {
if (window < 1e-5) { window = 1e-5; }
this->Window = window;
this->SetTableRange(this->Level - this->Window/2.0,
this->Level + this->Window/2.0); };
vtkGetMacro(Window,double);
//@}
//@{
/**
* Set the Level for the lookup table. The level is the average of
* TableRange[0] and TableRange[1].
*/
void SetLevel(double level) {
this->Level = level;
this->SetTableRange(this->Level - this->Window/2.0,
this->Level + this->Window/2.0); };
vtkGetMacro(Level,double);
//@}
//@{
/**
* Set inverse video on or off. You can achieve the same effect by
* switching the MinimumTableValue and the MaximumTableValue.
*/
void SetInverseVideo(int iv);
vtkGetMacro(InverseVideo,int);
vtkBooleanMacro(InverseVideo,int);
//@}
//@{
/**
* Set the minimum table value. All lookup table entries below the
* start of the ramp will be set to this color. After you change
* this value, you must re-build the lookup table.
*/
vtkSetVector4Macro(MinimumTableValue,double);
vtkGetVector4Macro(MinimumTableValue,double);
//@}
//@{
/**
* Set the maximum table value. All lookup table entries above the
* end of the ramp will be set to this color. After you change
* this value, you must re-build the lookup table.
*/
vtkSetVector4Macro(MaximumTableValue,double);
vtkGetVector4Macro(MaximumTableValue,double);
//@}
protected:
vtkWindowLevelLookupTable(int sze=256, int ext=256);
~vtkWindowLevelLookupTable() {}
double Window;
double Level;
int InverseVideo;
double MaximumTableValue[4];
double MinimumTableValue[4];
private:
vtkWindowLevelLookupTable(const vtkWindowLevelLookupTable&) VTK_DELETE_FUNCTION;
void operator=(const vtkWindowLevelLookupTable&) VTK_DELETE_FUNCTION;
};
#endif
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