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vtkRangeHandlesItem.h
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vtkRangeHandlesItem.h
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkRangeHandlesItem.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 vtkRangeHandlesItem
* @brief item to show and control the range of a vtkColorTransferFunction
*
* vtkRangeHandlesItem provides range handles painting and management
* for a provided vtkColorTransferFunction.
* This specialization of vtkPlotRangeHandlesItem works in coordination with
* the color transfer function to drive the behavior of handles.
* Handles can only be dragged within the color transfer function range and
* are forced to be placed vertically with a fixed height of 1.
*
* A typical use case for this class is to observe EndInteractionEvent to
* update the color transfer function range using the handles range.
*
* @sa
* vtkControlPointsItem
* vtkScalarsToColorsItem
* vtkColorTransferFunctionItem
*/
#ifndef vtkRangeHandlesItem_h
#define vtkRangeHandlesItem_h
#include "vtkChartsCoreModule.h" // For export macro
#include "vtkPlotRangeHandlesItem.h"
class vtkColorTransferFunction;
class VTKCHARTSCORE_EXPORT vtkRangeHandlesItem : public vtkPlotRangeHandlesItem
{
public:
vtkTypeMacro(vtkRangeHandlesItem, vtkPlotRangeHandlesItem);
void PrintSelf(ostream& os, vtkIndent indent) override;
static vtkRangeHandlesItem* New();
/**
* Overridden to check that a color transfer function has been set before
* painting.
*/
bool Paint(vtkContext2D* painter) override;
/**
* Overridden to get the bounds from the color transfer function range.
*/
void GetBounds(double bounds[4]) override;
/**
* Overridden to return the range of the color transfer function.
* Use this method by observing EndInteractionEvent
*/
void GetHandlesRange(double range[2]) override;
///@{
/**
* Get/set the color transfer function to interact with.
*/
void SetColorTransferFunction(vtkColorTransferFunction* ctf);
vtkGetObjectMacro(ColorTransferFunction, vtkColorTransferFunction);
///@}
/**
* Compute the handles draw range by using the handle width and the transfer
* function.
*/
void ComputeHandlesDrawRange() override;
///@{
/**
* Overridden to force using desynchronized vertical handles.
* Desynchronized handles means that handles are always moved independently,
* as opposed to synchronized handles where the left handle drives the
* modification of the whole range. See superclass for more information.
*/
void SynchronizeRangeHandlesOn() override { this->Superclass::SynchronizeRangeHandlesOff(); }
void SetSynchronizeRangeHandles(vtkTypeBool vtkNotUsed(synchronize)) override
{
this->Superclass::SynchronizeRangeHandlesOff();
}
void SetHandleOrientation(int vtkNotUsed(orientation)) override
{
this->Superclass::SetHandleOrientation(Orientation::VERTICAL);
}
///@}
protected:
vtkRangeHandlesItem();
~vtkRangeHandlesItem() override;
/**
* Overridden to clamp the handle position in the color tranfer function
* range.
*/
void SetActiveHandlePosition(double position) override;
private:
vtkRangeHandlesItem(const vtkRangeHandlesItem&) = delete;
void operator=(const vtkRangeHandlesItem&) = delete;
vtkColorTransferFunction* ColorTransferFunction = nullptr;
};
#endif // vtkRangeHandlesItem_h