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137 lines
4.3 KiB
C++
137 lines
4.3 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkSplineRepresentation.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 vtkSplineRepresentation
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* @brief representation for a spline.
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*
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* vtkSplineRepresentation is a vtkWidgetRepresentation for a spline.
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* This 3D widget defines a spline that can be interactively placed in a
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* scene. The spline has handles, the number of which can be changed, plus it
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* can be picked on the spline itself to translate or rotate it in the scene.
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* This is based on vtkSplineWidget.
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* @sa
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* vtkSplineWidget, vtkSplineWidget2
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*/
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#ifndef vtkSplineRepresentation_h
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#define vtkSplineRepresentation_h
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#include "vtkCurveRepresentation.h"
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#include "vtkInteractionWidgetsModule.h" // For export macro
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class vtkActor;
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class vtkCellPicker;
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class vtkDoubleArray;
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class vtkParametricFunctionSource;
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class vtkParametricSpline;
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class vtkPlaneSource;
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class vtkPoints;
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class vtkPolyData;
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class vtkProp;
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class vtkProperty;
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class vtkSphereSource;
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class vtkTransform;
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class VTKINTERACTIONWIDGETS_EXPORT vtkSplineRepresentation : public vtkCurveRepresentation
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{
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public:
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static vtkSplineRepresentation* New();
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vtkTypeMacro(vtkSplineRepresentation, vtkCurveRepresentation);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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/**
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* Grab the polydata (including points) that defines the spline. The
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* polydata consists of points and line segments numbering Resolution + 1
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* and Resolution, respectively. Points are guaranteed to be up-to-date when
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* either the InteractionEvent or EndInteraction events are invoked. The
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* user provides the vtkPolyData and the points and polyline are added to it.
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*/
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void GetPolyData(vtkPolyData* pd) override;
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/**
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* Set the number of handles for this widget.
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*/
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void SetNumberOfHandles(int npts) override;
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//@{
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/**
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* Set/Get the number of line segments representing the spline for
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* this widget.
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*/
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void SetResolution(int resolution);
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vtkGetMacro(Resolution, int);
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//@}
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//@{
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/**
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* Set the parametric spline object. Through vtkParametricSpline's API, the
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* user can supply and configure one of two types of spline:
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* vtkCardinalSpline, vtkKochanekSpline. The widget controls the open
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* or closed configuration of the spline.
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* WARNING: The widget does not enforce internal consistency so that all
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* three are of the same type.
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*/
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virtual void SetParametricSpline(vtkParametricSpline*);
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vtkGetObjectMacro(ParametricSpline, vtkParametricSpline);
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//@}
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/**
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* Get the position of the spline handles.
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*/
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vtkDoubleArray* GetHandlePositions() override;
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/**
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* Get the approximate vs. the true arc length of the spline. Calculated as
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* the summed lengths of the individual straight line segments. Use
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* SetResolution to control the accuracy.
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*/
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double GetSummedLength() override;
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/**
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* Convenience method to allocate and set the handles from a vtkPoints
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* instance. If the first and last points are the same, the spline sets
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* Closed to the on InteractionState and disregards the last point, otherwise Closed
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* remains unchanged.
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*/
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void InitializeHandles(vtkPoints* points) override;
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/**
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* These are methods that satisfy vtkWidgetRepresentation's API. Note that a
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* version of place widget is available where the center and handle position
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* are specified.
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*/
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void BuildRepresentation() override;
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protected:
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vtkSplineRepresentation();
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~vtkSplineRepresentation() override;
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// The spline
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vtkParametricSpline* ParametricSpline;
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vtkParametricFunctionSource* ParametricFunctionSource;
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// The number of line segments used to represent the spline.
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int Resolution;
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// Specialized method to insert a handle on the poly line.
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int InsertHandleOnLine(double* pos) override;
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private:
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vtkSplineRepresentation(const vtkSplineRepresentation&) = delete;
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void operator=(const vtkSplineRepresentation&) = delete;
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};
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#endif
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