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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.
=========================================================================*/
// .NAME vtkWindowLevelLookupTable - map scalar values into colors or colors to scalars; generate color table
// .SECTION Description
// 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.
// .SECTION Caveats
// 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).
// .SECTION See Also
// vtkLogLookupTable
#ifndef __vtkWindowLevelLookupTable_h
#define __vtkWindowLevelLookupTable_h
#include "vtkLookupTable.h"
class VTK_COMMON_EXPORT vtkWindowLevelLookupTable : public vtkLookupTable
{
public:
static vtkWindowLevelLookupTable *New();
vtkTypeMacro(vtkWindowLevelLookupTable,vtkLookupTable);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Generate lookup table as a linear ramp between MinimumTableValue
// and MaximumTableValue.
void Build();
// Description:
// 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);
// Description:
// 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);
// Description:
// 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);
// Description:
// 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);
// Description:
// 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);
// Description:
// @deprecated For backwards compatibility: specify the color using
// integers in the range [0,255].
VTK_LEGACY(void SetMinimumColor(int r, int g, int b, int a));
VTK_LEGACY(void SetMinimumColor(const unsigned char rgba[4]));
VTK_LEGACY(void GetMinimumColor(unsigned char rgba[4]));
VTK_LEGACY(unsigned char *GetMinimumColor());
// Description:
// @deprecated For backwards compatibility: specify the color using
// integers in the range [0,255].
VTK_LEGACY(void SetMaximumColor(int r, int g, int b, int a));
VTK_LEGACY(void SetMaximumColor(const unsigned char rgba[4]));
VTK_LEGACY(void GetMaximumColor(unsigned char rgba[4]));
VTK_LEGACY(unsigned char *GetMaximumColor());
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&); // Not implemented.
void operator=(const vtkWindowLevelLookupTable&); // Not implemented.
};
#endif
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