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Program: Visualization Toolkit
Module: vtkBalloonRepresentation.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 vtkBalloonRepresentation - represent the vtkBalloonWidget
// .SECTION Description
// The vtkBalloonRepresentation is used to represent the vtkBalloonWidget.
// This representation is defined by two items: a text string and an image.
// At least one of these two items must be defined, but it is allowable to
// specify both, or just an image or just text. If both the text and image
// are specified, then methods are available for positioning the text and
// image with respect to each other.
// The balloon representation consists of three parts: text, a rectangular
// frame behind the text, and an image placed next to the frame and sized
// to match the frame.
// The size of the balloon is ultimately controlled by the text properties
// (i.e., font size). This representation uses a layout policy as follows.
// If there is just text and no image, then the text properties and padding
// are used to control the size of the balloon.
// If there is just an image and no text, then the ImageSize[2] member is
// used to control the image size. (The image will fit into this rectangle,
// but will not necessarily fill the whole rectangle, i.e., the image is not
// stretched).
// If there is text and an image, the following approach ia used. First,
// based on the font size and other related properties (e.g., padding),
// determine the size of the frame. Second, depending on the layout of the
// image and text frame, control the size of the neighboring image (since the
// frame and image share a common edge). However, if this results in an image
// that is smaller than ImageSize[2], then the image size will be set to
// ImageSize[2] and the frame will be adjusted accordingly. The text is
// always placed in the center of the frame if the frame is resized.
// .SECTION See Also
// vtkBalloonWidget
#ifndef __vtkBalloonRepresentation_h
#define __vtkBalloonRepresentation_h
#include "vtkWidgetRepresentation.h"
class vtkTextMapper;
class vtkTextActor;
class vtkTextProperty;
class vtkPoints;
class vtkCellArray;
class vtkPolyData;
class vtkPolyDataMapper2D;
class vtkActor2D;
class vtkProperty2D;
class vtkImageData;
class vtkTexture;
class vtkPoints;
class vtkPolyData;
class vtkPolyDataMapper2D;
class vtkActor2D;
class VTK_WIDGETS_EXPORT vtkBalloonRepresentation : public vtkWidgetRepresentation
// Description:
// Instantiate the class.
static vtkBalloonRepresentation *New();
// Description:
// Standard VTK methods.
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Specify/retrieve the image to display in the balloon.
virtual void SetBalloonImage(vtkImageData *img);
// Description:
// Specify/retrieve the text to display in the balloon.
// Description:
// Specify the minimum size for the image. Note that this is a bounding
// rectangle, the image will fit inside of it. However, if the balloon
// consists of text plus an image, then the image may be bigger than
// ImageSize[2] to fit into the balloon frame.
// Description:
// Set/get the text property (relevant only if text is shown).
virtual void SetTextProperty(vtkTextProperty *p);
// Description:
// Set/get the frame property (relevant only if text is shown).
// The frame lies behind the text.
virtual void SetFrameProperty(vtkProperty2D *p);
// Description:
// Set/get the image property (relevant only if an image is shown).
virtual void SetImageProperty(vtkProperty2D *p);
enum {ImageLeft=0,ImageRight,ImageBottom,ImageTop};
// Description:
// Specify the layout of the image and text within the balloon. Note that
// there are reduncies in these methods, for example
// SetBalloonLayoutToImageLeft() results in the same effect as
// SetBalloonLayoutToTextRight(). If only text is specified, or only an
// image is specified, then it doesn't matter how the layout is specified.
void SetBalloonLayoutToImageLeft() {this->SetBalloonLayout(ImageLeft);}
void SetBalloonLayoutToImageRight() {this->SetBalloonLayout(ImageRight);}
void SetBalloonLayoutToImageBottom() {this->SetBalloonLayout(ImageBottom);}
void SetBalloonLayoutToImageTop() {this->SetBalloonLayout(ImageTop);}
void SetBalloonLayoutToTextLeft() {this->SetBalloonLayout(ImageRight);}
void SetBalloonLayoutToTextRight() {this->SetBalloonLayout(ImageLeft);}
void SetBalloonLayoutToTextTop() {this->SetBalloonLayout(ImageBottom);}
void SetBalloonLayoutToTextBottom() {this->SetBalloonLayout(ImageTop);}
// Description:
// Set/Get the offset from the mouse pointer from which to place the
// balloon. The representation will try and honor this offset unless there
// is a collision with the side of the renderer, in which case the balloon
// will be repositioned to lie within the rendering window.
// Description:
// Set/Get the padding (in pixels) that is used between the text and the
// frame.
// Description:
// These are methods that satisfy vtkWidgetRepresentation's API.
virtual void StartWidgetInteraction(double e[2]);
virtual void EndWidgetInteraction(double e[2]);
virtual void BuildRepresentation();
// Description:
// Methods required by vtkProp superclass.
virtual void ReleaseGraphicsResources(vtkWindow *w);
virtual int RenderOverlay(vtkViewport *viewport);
// The balloon text and image
char *BalloonText;
vtkImageData *BalloonImage;
// The layout of the balloon
int BalloonLayout;
// Controlling placement
int Padding;
int Offset[2];
int ImageSize[2];
// Represent the text
vtkTextMapper *TextMapper;
vtkActor2D *TextActor;
vtkTextProperty *TextProperty;
// Represent the image
vtkTexture *Texture;
vtkPolyData *TexturePolyData;
vtkPoints *TexturePoints;
vtkPolyDataMapper2D *TextureMapper;
vtkActor2D *TextureActor;
vtkProperty2D *ImageProperty;
// The frame
vtkPoints *FramePoints;
vtkCellArray *FramePolygon;
vtkPolyData *FramePolyData;
vtkPolyDataMapper2D *FrameMapper;
vtkActor2D *FrameActor;
vtkProperty2D *FrameProperty;
// Internal variable controlling rendering process
int TextVisible;
int ImageVisible;
// Helper methods
void AdjustImageSize(double imageSize[2]);
void ScaleImage(double imageSize[2],double scale);
vtkBalloonRepresentation(const vtkBalloonRepresentation&); //Not implemented
void operator=(const vtkBalloonRepresentation&); //Not implemented