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