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Program: Visualization Toolkit
Module: vtkImagePlaneWidget.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or for details.
This software is distributed WITHOUT ANY WARRANTY; without even
PURPOSE. See the above copyright notice for more information.
// .NAME vtkImagePlaneWidget - 3D widget for reslicing image data
// .SECTION Description
// This 3D widget defines a plane that can be interactively placed in an
// image volume. A nice feature of the object is that the
// vtkImagePlaneWidget, like any 3D widget, will work with the current
// interactor style. That is, if vtkImagePlaneWidget does not handle an
// event, then all other registered observers (including the interactor
// style) have an opportunity to process the event. Otherwise, the
// vtkImagePlaneWidget will terminate the processing of the event that it
// handles.
// The core functionality of the widget is provided by a vtkImageReslice
// object which passes its output onto a texture mapping pipeline for fast
// slicing through volumetric data. See the key methods: GenerateTexturePlane()
// and UpdatePlane() for implementation details.
// To use this object, just invoke SetInteractor() with the argument of the
// method a vtkRenderWindowInteractor. You may also wish to invoke
// "PlaceWidget()" to initially position the widget. If the "i" key (for
// "interactor") is pressed, the vtkImagePlaneWidget will appear. (See
// superclass documentation for information about changing this behavior.)
// Selecting the widget with the middle mouse button with and without holding
// the shift or control keys enables complex reslicing capablilites.
// To facilitate use, a set of 'margins' (left, right, top, bottom) are shown as
// a set of plane-axes aligned lines, the properties of which can be changed
// as a group.
// Without keyboard modifiers: selecting in the middle of the margins
// enables translation of the plane along its normal. Selecting one of the
// corners within the margins enables spinning around the plane's normal at its
// center. Selecting within a margin allows rotating about the center of the
// plane around an axis aligned with the margin (i.e., selecting left margin
// enables rotating around the plane's local y-prime axis).
// With control key modifier: margin selection enables edge translation (i.e., a
// constrained form of scaling). Selecting within the margins enables
// translation of the entire plane.
// With shift key modifier: uniform plane scaling is enabled. Moving the mouse
// up enlarges the plane while downward movement shrinks it.
// Window-level is achieved by using the right mouse button. Window-level
// values can be reset by shift + 'r' or control + 'r' while regular reset
// camera is maintained with 'r' or 'R'.
// The left mouse button can be used to query the underlying image data
// with a snap-to cross-hair cursor. Currently, the nearest point in the input
// image data to the mouse cursor generates the cross-hairs. With oblique
// slicing, this behaviour may appear unsatisfactory. Text display of
// window-level and image coordinates/data values are provided by a text
// actor/mapper pair.
// Events that occur outside of the widget (i.e., no part of the widget is
// picked) are propagated to any other registered obsevers (such as the
// interaction style). Turn off the widget by pressing the "i" key again
// (or invoke the Off() method). To support interactive manipulation of
// objects, this class invokes the events StartInteractionEvent,
// InteractionEvent, and EndInteractionEvent as well as StartWindowLevelEvent,
// WindowLevelEvent, EndWindowLevelEvent and ResetWindowLevelEvent.
// The vtkImagePlaneWidget has several methods that can be used in
// conjunction with other VTK objects. The GetPolyData() method can be used
// to get the polygonal representation of the plane and can be used as input
// for other VTK objects. Typical usage of the widget is to make use of the
// StartInteractionEvent, InteractionEvent, and EndInteractionEvent
// events. The InteractionEvent is called on mouse motion; the other two
// events are called on button down and button up (either left or right
// button).
// Some additional features of this class include the ability to control the
// properties of the widget. You can set the properties of: the selected and
// unselected representations of the plane's outline; the text actor via its
// vtkTextProperty; the cross-hair cursor. In addition there are methods to
// constrain the plane so that it is aligned along the x-y-z axes. Finally,
// one can specify the degree of interpolation (vtkImageReslice): nearest
// neighbour, linear, and cubic.
// .SECTION Thanks
// Thanks to Dean Inglis for developing and contributing this class.
// Based on the Python SlicePlaneFactory from Atamai, Inc.
// .SECTION Caveats
// Note that handles and plane can be picked even when they are "behind" other
// actors. This is an intended feature and not a bug.
// .SECTION See Also
// vtk3DWidget vtkBoxWidget vtkLineWidget vtkPlaneWidget vtkPointWidget
// vtkPolyDataSourceWidget vtkSphereWidget vtkImplicitPlaneWidget
#ifndef __vtkImagePlaneWidget_h
#define __vtkImagePlaneWidget_h
#include "vtkPolyDataSourceWidget.h"
class vtkActor;
class vtkAbstractPropPicker;
class vtkDataSetMapper;
class vtkImageData;
class vtkImageMapToColors;
class vtkImageReslice;
class vtkLookupTable;
class vtkMatrix4x4;
class vtkPlaneSource;
class vtkPoints;
class vtkPolyData;
class vtkProperty;
class vtkTextActor;
class vtkTextProperty;
class vtkTexture;
class vtkTransform;
class VTK_WIDGETS_EXPORT vtkImagePlaneWidget : public vtkPolyDataSourceWidget
// Description:
// Instantiate the object.
static vtkImagePlaneWidget *New();
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Methods that satisfy the superclass' API.
virtual void SetEnabled(int);
virtual void PlaceWidget(double bounds[6]);
void PlaceWidget()
void PlaceWidget(double xmin, double xmax, double ymin, double ymax,
double zmin, double zmax)
// Description:
// Set the vtkImageData* input for the vtkImageReslice.
void SetInput(vtkDataSet* input);
// Description:
// Set/Get the origin of the plane.
void SetOrigin(double x, double y, double z);
void SetOrigin(double xyz[3]);
double* GetOrigin();
void GetOrigin(double xyz[3]);
// Description:
// Set/Get the position of the point defining the first axis of the plane.
void SetPoint1(double x, double y, double z);
void SetPoint1(double xyz[3]);
double* GetPoint1();
void GetPoint1(double xyz[3]);
// Description:
// Set/Get the position of the point defining the second axis of the plane.
void SetPoint2(double x, double y, double z);
void SetPoint2(double xyz[3]);
double* GetPoint2();
void GetPoint2(double xyz[3]);
// Description:
// Get the center of the plane.
double* GetCenter();
void GetCenter(double xyz[3]);
// Description:
// Get the normal to the plane.
double* GetNormal();
void GetNormal(double xyz[3]);
// Description:
// Get the vector from the plane origin to point1.
void GetVector1(double v1[3]);
// Description:
// Get the vector from the plane origin to point2.
void GetVector2(double v2[3]);
// Description:
// Get the slice position in terms of the data extent.
int GetSliceIndex();
// Description:
// Set the slice position in terms of the data extent.
void SetSliceIndex(int index);
// Description:
// Get the position of the slice along its normal.
double GetSlicePosition();
// Description:
// Set the position of the slice along its normal.
void SetSlicePosition(double position);
// Description:
// Set the interpolation to use when texturing the plane.
void SetResliceInterpolate(int);
void SetResliceInterpolateToNearestNeighbour()
{ this->SetResliceInterpolate(VTK_NEAREST_RESLICE); }
void SetResliceInterpolateToLinear()
{ this->SetResliceInterpolate(VTK_LINEAR_RESLICE); }
void SetResliceInterpolateToCubic()
{ this->SetResliceInterpolate(VTK_CUBIC_RESLICE); }
// Description:
// Convenience method to get the vtkImageReslice output.
vtkImageData* GetResliceOutput();
// Description:
// Make sure that the plane remains within the volume.
// Default is On.
// Description:
// Let the user control the lookup table. NOTE: apply this method BEFORE
// applying the SetLookupTable method.
// Default is Off.
// Description:
// Specify whether to interpolate the texture or not. When off, the
// reslice interpolation is nearest neighbour regardless of how the
// interpolation is set through the API. Set before setting the
// vtkImageData input. Default is On.
// Description:
// Control the visibility of the actual texture mapped reformatted plane.
// in some cases you may only want the plane outline for example.
virtual void SetTextureVisibility(int);
// Description:
// Grab the polydata (including points) that defines the plane. The
// polydata consists of (res+1)*(res+1) points, and res*res quadrilateral
// polygons, where res is the resolution of the plane. These point values
// are guaranteed to be up-to-date when either the InteractionEvent or
// EndInteraction events are invoked. The user provides the vtkPolyData and
// the points and polygons are added to it.
void GetPolyData(vtkPolyData *pd);
// Description:
// Satisfies superclass API. This returns a pointer to the underlying
// vtkPolyData. Make changes to this before calling the initial PlaceWidget()
// to have the initial placement follow suit. Or, make changes after the
// widget has been initialised and call UpdatePlacement() to realise.
vtkPolyDataAlgorithm* GetPolyDataAlgorithm();
// Description:
// Satisfies superclass API. This will change the state of the widget to
// match changes that have been made to the underlying vtkPolyDataSource
void UpdatePlacement(void);
// Description:
// Convenience method to get the texture used by this widget. This can be
// used in external slice viewers.
vtkTexture *GetTexture();
// Description:
// Convenience method to get the vtkImageMapToColors filter used by this
// widget. The user can properly render other transparent actors in a
// scene by calling the filter's SetOutputFormatToRGB and
// PassAlphaToOutputOff.
vtkGetObjectMacro(ColorMap, vtkImageMapToColors);
virtual void SetColorMap(vtkImageMapToColors *);
// Description:
// Set/Get the plane's outline properties. The properties of the plane's
// outline when selected and unselected can be manipulated.
virtual void SetPlaneProperty(vtkProperty*);
virtual void SetSelectedPlaneProperty(vtkProperty*);
// Description:
// Convenience method sets the plane orientation normal to the
// x, y, or z axes. Default is XAxes (0).
void SetPlaneOrientation(int);
void SetPlaneOrientationToXAxes()
{ this->SetPlaneOrientation(0); }
void SetPlaneOrientationToYAxes()
{ this->SetPlaneOrientation(1); }
void SetPlaneOrientationToZAxes()
{ this->SetPlaneOrientation(2); }
// Description:
// Set the internal picker to one defined by the user. In this way,
// a set of three orthogonal planes can share the same picker so that
// picking is performed correctly. The default internal picker can be
// re-set/allocated by setting to 0 (NULL).
void SetPicker(vtkAbstractPropPicker*);
// Description:
// Set/Get the internal lookuptable (lut) to one defined by the user, or,
// alternatively, to the lut of another vtkImgePlaneWidget. In this way,
// a set of three orthogonal planes can share the same lut so that
// window-levelling is performed uniformly among planes. The default
// internal lut can be re- set/allocated by setting to 0 (NULL).
virtual void SetLookupTable(vtkLookupTable*);
// Description:
// Enable/disable text display of window-level, image coordinates and
// scalar values in a render window.
// Description:
// Set the properties of the cross-hair cursor.
virtual void SetCursorProperty(vtkProperty*);
// Description:
// Set the properties of the margins.
virtual void SetMarginProperty(vtkProperty*);
// Description:
// Set the size of the margins based on a percentage of the
// plane's width and height, limited between 0 and 50%.
vtkSetClampMacro(MarginSizeX,double, 0.0, 0.5);
vtkGetMacro(MarginSizeX, double);
vtkSetClampMacro(MarginSizeY,double, 0.0, 0.5);
vtkGetMacro(MarginSizeY, double);
// Description:
// Set/Get the text property for the image data and window-level annotation.
void SetTextProperty(vtkTextProperty* tprop);
vtkTextProperty* GetTextProperty();
// Description:
// Set/Get the property for the resliced image.
virtual void SetTexturePlaneProperty(vtkProperty*);
// Description:
// Set/Get the current window and level values. SetWindowLevel should
// only be called after SetInput. If a shared lookup table is being used,
// a callback is required to update the window level values without having
// to update the lookup table again.
void SetWindowLevel(double window, double level, int copy = 0);
void GetWindowLevel(double wl[2]);
double GetWindow(){return this->CurrentWindow;}
double GetLevel(){return this->CurrentLevel;}
// Description:
// Get the image coordinate position and voxel value. Currently only
// supports single component image data.
int GetCursorData(double xyzv[4]);
// Description:
// Get the status of the cursor data. If this returns 1 the
// CurrentCursorPosition and CurrentImageValue will have current
// data. If it returns 0, these values are invalid.
int GetCursorDataStatus();
// Description:
// Get the current cursor position. To be used in conjunction with
// GetCursorDataStatus.
// Description:
// Get the current image value at the current cursor position. To
// be used in conjunction with GetCursorDataStatus. The value is
// VTK_DOUBLE_MAX when the data is invalid.
// Description:
// Choose between voxel centered or continuous cursor probing. With voxel
// centered probing, the cursor snaps to the nearest voxel and the reported
// cursor coordinates are extent based. With continuous probing, voxel data
// is interpolated using vtkDataSetAttributes' InterpolatePoint method and
// the reported coordinates are 3D spatial continuous.
// Description:
// Enable/disable mouse interaction so the widget remains on display.
void SetInteraction(int interact);
// Description:
// Set action associated to buttons.
vtkSetClampMacro(LeftButtonAction,int, VTK_CURSOR_ACTION, VTK_WINDOW_LEVEL_ACTION);
vtkGetMacro(LeftButtonAction, int);
vtkSetClampMacro(MiddleButtonAction,int, VTK_CURSOR_ACTION, VTK_WINDOW_LEVEL_ACTION);
vtkGetMacro(MiddleButtonAction, int);
vtkSetClampMacro(RightButtonAction,int, VTK_CURSOR_ACTION, VTK_WINDOW_LEVEL_ACTION);
vtkGetMacro(RightButtonAction, int);
// Description:
// Set the auto-modifiers associated to buttons.
// This allows users to bind some buttons to actions that are usually
// triggered by a key modifier. For example, if you do not need cursoring,
// you can bind the left button action to VTK_SLICE_MOTION_ACTION (see above)
// and the left button auto modifier to VTK_CONTROL_MODIFIER: you end up with
// the left button controling panning without pressing a key.
vtkSetClampMacro(LeftButtonAutoModifier,int, VTK_NO_MODIFIER, VTK_CONTROL_MODIFIER);
vtkGetMacro(LeftButtonAutoModifier, int);
vtkSetClampMacro(MiddleButtonAutoModifier,int, VTK_NO_MODIFIER, VTK_CONTROL_MODIFIER);
vtkGetMacro(MiddleButtonAutoModifier, int);
vtkSetClampMacro(RightButtonAutoModifier,int, VTK_NO_MODIFIER, VTK_CONTROL_MODIFIER);
vtkGetMacro(RightButtonAutoModifier, int);
int TextureVisibility;
int LeftButtonAction;
int MiddleButtonAction;
int RightButtonAction;
int LeftButtonAutoModifier;
int MiddleButtonAutoModifier;
int RightButtonAutoModifier;
int LastButtonPressed;
//BTX - manage the state of the widget
int State;
enum WidgetState
// Handles the events
static void ProcessEvents(vtkObject* object,
unsigned long event,
void* clientdata,
void* calldata);
// internal utility method that adds observers to the RenderWindowInteractor
// so that our ProcessEvents is eventually called. this method is called
// by SetEnabled as well as SetInteraction
void AddObservers();
// ProcessEvents() dispatches to these methods.
virtual void OnMouseMove();
virtual void OnLeftButtonDown();
virtual void OnLeftButtonUp();
virtual void OnMiddleButtonDown();
virtual void OnMiddleButtonUp();
virtual void OnRightButtonDown();
virtual void OnRightButtonUp();
virtual void OnChar();
virtual void StartCursor();
virtual void StopCursor();
virtual void StartSliceMotion();
virtual void StopSliceMotion();
virtual void StartWindowLevel();
virtual void StopWindowLevel();
// controlling ivars
int Interaction; // Is the widget responsive to mouse events
int PlaneOrientation;
int RestrictPlaneToVolume;
double OriginalWindow;
double OriginalLevel;
double CurrentWindow;
double CurrentLevel;
double InitialWindow;
double InitialLevel;
int StartWindowLevelPositionX;
int StartWindowLevelPositionY;
int ResliceInterpolate;
int TextureInterpolate;
int UserControlledLookupTable;
int DisplayText;
// The geometric represenation of the plane and it's outline
vtkPlaneSource *PlaneSource;
vtkPolyData *PlaneOutlinePolyData;
vtkActor *PlaneOutlineActor;
void HighlightPlane(int highlight);
void GeneratePlaneOutline();
// Re-builds the plane outline based on the plane source
void BuildRepresentation();
// Do the picking
vtkAbstractPropPicker *PlanePicker;
// for negative window values.
void InvertTable();
// Methods to manipulate the plane
void WindowLevel(int X, int Y);
void Push(double *p1, double *p2);
void Spin(double *p1, double *p2);
void Rotate(double *p1, double *p2, double *vpn);
void Scale(double *p1, double *p2, int X, int Y);
void Translate(double *p1, double *p2);
vtkImageData *ImageData;
vtkImageReslice *Reslice;
vtkMatrix4x4 *ResliceAxes;
vtkTransform *Transform;
vtkActor *TexturePlaneActor;
vtkImageMapToColors *ColorMap;
vtkTexture *Texture;
vtkLookupTable *LookupTable;
vtkLookupTable *CreateDefaultLookupTable();
// Properties used to control the appearance of selected objects and
// the manipulator in general. The plane property is actually that for
// the outline. The TexturePlaneProperty can be used to control the
// lighting etc. of the resliced image data.
vtkProperty *PlaneProperty;
vtkProperty *SelectedPlaneProperty;
vtkProperty *CursorProperty;
vtkProperty *MarginProperty;
vtkProperty *TexturePlaneProperty;
void CreateDefaultProperties();
// Reslice and texture management
void UpdatePlane();
void GenerateTexturePlane();
// The cross-hair cursor
vtkPolyData *CursorPolyData;
vtkActor *CursorActor;
double CurrentCursorPosition[3];
double CurrentImageValue; // Set to VTK_DOUBLE_MAX when invalid
void GenerateCursor();
void UpdateCursor(int,int);
void ActivateCursor(int);
int UpdateContinuousCursor(double *q);
int UpdateDiscreteCursor(double *q);
int UseContinuousCursor;
// The text to display W/L, image data
vtkTextActor *TextActor;
char TextBuff[128];
void GenerateText();
void ManageTextDisplay();
void ActivateText(int);
// Oblique reslice control
double RotateAxis[3];
double RadiusVector[3];
void AdjustState();
// Visible margins to assist user interaction
vtkPolyData *MarginPolyData;
vtkActor *MarginActor;
int MarginSelectMode;
void GenerateMargins();
void UpdateMargins();
void ActivateMargins(int);
double MarginSizeX;
double MarginSizeY;
vtkImagePlaneWidget(const vtkImagePlaneWidget&); //Not implemented
void operator=(const vtkImagePlaneWidget&); //Not implemented
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