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