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/*=========================================================================
Program: Visualization Toolkit
Module: vtkLabeledContourPolyDataItem.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 vtkLabeledContourPolyDataItem
* @brief Filter that translate a vtkPolyData 2D mesh into vtkContextItems.
*
* @warning
* The input vtkPolyData should be a 2D mesh.
*
*/
#ifndef vtkLabeledContourPolyDataItem_h
#define vtkLabeledContourPolyDataItem_h
#include "vtkPolyDataItem.h"
#include "vtkRect.h" // For vtkRect/vtkVector/vtkTuple
#include "vtkRenderingContext2DModule.h" // For export macro
#include "vtkSmartPointer.h" // For vtkSmartPointer
VTK_ABI_NAMESPACE_BEGIN
class vtkActor;
class vtkContext2D;
class vtkDoubleArray;
class vtkRenderer;
class vtkTextActor3D;
class vtkTextProperty;
class vtkTextPropertyCollection;
struct PDILabelHelper;
class VTKRENDERINGCONTEXT2D_EXPORT vtkLabeledContourPolyDataItem : public vtkPolyDataItem
{
public:
vtkTypeMacro(vtkLabeledContourPolyDataItem, vtkPolyDataItem);
void PrintSelf(ostream& os, vtkIndent indent) override;
static vtkLabeledContourPolyDataItem* New();
/**
* Paint event for the item.
*/
bool Paint(vtkContext2D* painter) override;
/**
* The text property used to label the lines. Note that both vertical and
* horizontal justifications will be reset to "Centered" prior to rendering.
* @note This is a convenience method that clears TextProperties and inserts
* the argument as the only property in the collection.
* @sa SetTextProperties
*/
virtual void SetTextProperty(vtkTextProperty* tprop);
///@{
/**
* The text properties used to label the lines. Note that both vertical and
* horizontal justifications will be reset to "Centered" prior to rendering.
* If the TextPropertyMapping array exists, then it is used to identify which
* text property to use for each label as follows: If the scalar value of a
* line is found in the mapping, the index of the value in mapping is used to
* lookup the text property in the collection. If there are more mapping
* values than properties, the properties are looped through until the
* mapping is exhausted.
* Lines with scalar values missing from the mapping are assigned text
* properties in a round-robin fashion starting from the beginning of the
* collection, repeating from the start of the collection as necessary.
* @sa SetTextProperty
* @sa SetTextPropertyMapping
*/
virtual void SetTextProperties(vtkTextPropertyCollection* coll);
virtual vtkTextPropertyCollection* GetTextProperties();
///@}
///@{
/**
* Values in this array correspond to vtkTextProperty objects in the
* TextProperties collection. If a contour line's scalar value exists in
* this array, the corresponding text property is used for the label.
* See SetTextProperties for more information.
*/
virtual vtkDoubleArray* GetTextPropertyMapping();
virtual void SetTextPropertyMapping(vtkDoubleArray* mapping);
///@}
///@{
/**
* If true, labels will be placed and drawn during rendering. Otherwise,
* only the mapper returned by GetPolyDataMapper() will be rendered.
* The default is to draw labels.
*/
vtkSetMacro(LabelVisibility, bool);
vtkGetMacro(LabelVisibility, bool);
vtkBooleanMacro(LabelVisibility, bool);
///@}
///@{
/**
* Ensure that there are at least SkipDistance pixels between labels. This
* is only enforced on labels along the same line. The default is 0.
*/
vtkSetMacro(SkipDistance, double);
vtkGetMacro(SkipDistance, double);
///@}
protected:
vtkLabeledContourPolyDataItem();
~vtkLabeledContourPolyDataItem() override;
virtual void ComputeBounds();
void Reset();
bool CheckInputs();
bool CheckRebuild();
bool PrepareRender();
bool PlaceLabels();
bool ResolveLabels();
virtual bool CreateLabels();
bool RenderLabels(vtkContext2D* painter);
bool AllocateTextActors(vtkIdType num);
bool FreeTextActors();
double SkipDistance;
bool LabelVisibility;
vtkIdType NumberOfTextActors;
vtkIdType NumberOfUsedTextActors;
vtkTextActor3D** TextActors;
PDILabelHelper** LabelHelpers;
vtkSmartPointer<vtkTextPropertyCollection> TextProperties;
vtkSmartPointer<vtkDoubleArray> TextPropertyMapping;
vtkTimeStamp LabelBuildTime;
private:
vtkLabeledContourPolyDataItem(const vtkLabeledContourPolyDataItem&) = delete;
void operator=(const vtkLabeledContourPolyDataItem&) = delete;
struct Private;
Private* Internal;
};
VTK_ABI_NAMESPACE_END
#endif
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