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# vtkInteractorStyleUnicam Class Reference

`#include <vtkInteractorStyleUnicam.h>`

Inheritance diagram for vtkInteractorStyleUnicam:

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Collaboration diagram for vtkInteractorStyleUnicam:

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List of all members.

## Detailed Description

provides Unicam navigation style

Date:
  2002/08/29 14:51:35

Revision:
  1.19

UniCam is a camera interactor. Here, just the primary features of the UniCam technique are implemented. UniCam requires just one mouse button and supports context sensitive dollying, panning, and rotation. (In this implementation, it uses the right mouse button, leaving the middle and left available for other functions.) For more information, see the paper at:

ftp://ftp.cs.brown.edu/pub/papers/graphics/research/unicam.pdf

The following is a brief description of the UniCam Camera Controls. You can perform 3 operations on the camera: rotate, pan, and dolly the camera. All operations are reached through the right mouse button & mouse movements.

IMPORTANT: UniCam assumes there is an axis that makes sense as a "up" vector for the world. By default, this axis is defined to be the vector <0,0,1>. You can set it explicitly for the data you are viewing with the 'SetWorldUpVector(..)' method in C++, or similarly in Tcl/Tk (or other interpreted languages).

1. ROTATE:

Position the cursor over the point you wish to rotate around and press and release the left mouse button. A 'focus dot' appears indicating the point that will be the center of rotation. To rotate, press and hold the left mouse button and drag the mouse.. release the button to complete the rotation.

Rotations can be done without placing a focus dot first by moving the mouse cursor to within 10% of the window border & pressing and holding the left button followed by dragging the mouse. The last focus dot position will be re-used.

2. PAN:

Click and hold the left mouse button, and initially move the mouse left or right. The point under the initial pick will pick correlate w/ the mouse tip-- (i.e., direct manipulation).

3. DOLLY (+ PAN):

Click and hold the left mouse button, and initially move the mouse up or down. Moving the mouse down will dolly towards the picked point, and moving the mouse up will dolly away from it. Dollying occurs relative to the picked point which simplifies the task of dollying towards a region of interest. Left and right mouse movements will pan the camera left and right.

Warning:
  (NOTE: This implementation of Unicam assumes a perspective camera. It could be modified relatively easily to also support an orthographic projection.)

Created by:
  - Schroeder, Will

CVS contributions (if > 5%):
  - Schroeder, Will (77%)
  - Barre, Sebastien (12%)
  - Cedilnik, Andy (5%)

CVS logs (CVSweb):
  - .`h` (`/Rendering/vtkInteractorStyleUnicam.h)`
  - .`cxx` (`/Rendering/vtkInteractorStyleUnicam.cxx)`

Definition at line 123 of file vtkInteractorStyleUnicam.h.

## Public Types

typedef vtkInteractorStyle | Superclass

## Public Methods

virtual const char * | GetClassName ()
virtual int | IsA (const char *type)
void | PrintSelf (ostream &os, vtkIndent indent)
void | SetWorldUpVector (double a[3])
void | SetWorldUpVector (float a[3])
void | SetWorldUpVector (float x, float y, float z)
virtual float * | GetWorldUpVector ()
virtual void | GetWorldUpVector (float data[3])
virtual void | OnTimer ()
virtual void | OnMouseMove ()
virtual void | OnLeftButtonDown ()
virtual void | OnLeftButtonUp ()
virtual void | OnLeftButtonMove ()

## Static Public Methods

vtkInteractorStyleUnicam * | New ()
int | IsTypeOf (const char *type)
vtkInteractorStyleUnicam * | SafeDownCast (vtkObject *o)

## Protected Methods

| vtkInteractorStyleUnicam ()
virtual | ~vtkInteractorStyleUnicam ()
void | ChooseXY (int X, int Y)
void | RotateXY (int X, int Y)
void | DollyXY (int X, int Y)
void | PanXY (int X, int Y)
void | MyTranslateCamera (float v[3])
void | MyRotateCamera (float cx, float cy, float cz, float ax, float ay, float az, float angle)
void | GetRightVandUpV (float *p, vtkCamera *cam, float *rightV, float *upV)
void | NormalizeMouseXY (int X, int Y, float *NX, float *NY)
float | WindowAspect ()

## Protected Attributes

vtkWorldPointPicker * | InteractionPicker
int | ButtonDown
double | DTime
double | Dist
float | StartPix [2]
float | LastPos [2]
float | LastPix [2]
float | DownPt [3]
float | Center [3]
float | WorldUpVector [3]
vtkActor * | FocusSphere
int | IsDot
vtkRenderer * | FocusSphereRenderer
int | state

## Member Typedef Documentation

typedef vtkInteractorStyle vtkInteractorStyleUnicam::Superclass

| Reimplemented from vtkInteractorStyle. Definition at line 127 of file vtkInteractorStyleUnicam.h.

## Constructor & Destructor Documentation

vtkInteractorStyleUnicam::vtkInteractorStyleUnicam | ( |  | ) | `[protected]`

virtual vtkInteractorStyleUnicam::~vtkInteractorStyleUnicam | ( |  | ) | `[protected, virtual]`

## Member Function Documentation

vtkInteractorStyleUnicam* vtkInteractorStyleUnicam::New | ( |  | ) | `[static]`

| This class must be supplied with a vtkRenderWindowInteractor wrapper or parent. This class should not normally be instantiated by application programmers. Reimplemented from vtkInteractorStyle.

virtual const char* vtkInteractorStyleUnicam::GetClassName | ( |  | ) | `[virtual]`

| Reimplemented from vtkInteractorStyle.

int vtkInteractorStyleUnicam::IsTypeOf | ( | const char * | type | ) | `[static]`

| Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h. Reimplemented from vtkInteractorStyle.

virtual int vtkInteractorStyleUnicam::IsA | ( | const char * | type | ) | `[virtual]`

| Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h. Reimplemented from vtkInteractorStyle.

vtkInteractorStyleUnicam* vtkInteractorStyleUnicam::SafeDownCast | ( | vtkObject * | o | ) | `[static]`

| Reimplemented from vtkInteractorStyle.

void vtkInteractorStyleUnicam::PrintSelf | ( | ostream & | os,
|  | vtkIndent | indent
| ) | `[virtual]`

| Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes. Reimplemented from vtkInteractorStyle.

void vtkInteractorStyleUnicam::SetWorldUpVector | ( | double | a[3] | ) | `[inline]`

| Definition at line 130 of file vtkInteractorStyleUnicam.h.

void vtkInteractorStyleUnicam::SetWorldUpVector | ( | float | a[3] | ) | `[inline]`

| Definition at line 131 of file vtkInteractorStyleUnicam.h.

void vtkInteractorStyleUnicam::SetWorldUpVector | ( | float | x,
|  | float | y,
|  | float | z
| ) |

virtual float* vtkInteractorStyleUnicam::GetWorldUpVector | ( |  | ) | `[virtual]`

virtual void vtkInteractorStyleUnicam::GetWorldUpVector | ( | float | data[3] | ) | `[virtual]`

virtual void vtkInteractorStyleUnicam::OnMouseMove | ( |  | ) | `[virtual]`

| Concrete implementation of event bindings Reimplemented from vtkInteractorStyle.

virtual void vtkInteractorStyleUnicam::OnLeftButtonDown | ( |  | ) | `[virtual]`

| Concrete implementation of event bindings Reimplemented from vtkInteractorStyle.

virtual void vtkInteractorStyleUnicam::OnLeftButtonUp | ( |  | ) | `[virtual]`

| Concrete implementation of event bindings Reimplemented from vtkInteractorStyle.

virtual void vtkInteractorStyleUnicam::OnLeftButtonMove | ( |  | ) | `[virtual]`

| Concrete implementation of event bindings

virtual void vtkInteractorStyleUnicam::OnTimer | ( |  | ) | `[virtual]`

| OnTimer calls RotateCamera, RotateActor etc which should be overridden by style subclasses. Reimplemented from vtkInteractorStyle.

void vtkInteractorStyleUnicam::ChooseXY | ( | int | X,
|  | int | Y
| ) | `[protected]`

void vtkInteractorStyleUnicam::RotateXY | ( | int | X,
|  | int | Y
| ) | `[protected]`

void vtkInteractorStyleUnicam::DollyXY | ( | int | X,
|  | int | Y
| ) | `[protected]`

void vtkInteractorStyleUnicam::PanXY | ( | int | X,
|  | int | Y
| ) | `[protected]`

void vtkInteractorStyleUnicam::MyTranslateCamera | ( | float | v[3] | ) | `[protected]`

void vtkInteractorStyleUnicam::MyRotateCamera | ( | float | cx,
|  | float | cy,
|  | float | cz,
|  | float | ax,
|  | float | ay,
|  | float | az,
|  | float | angle
| ) | `[protected]`

void vtkInteractorStyleUnicam::GetRightVandUpV | ( | float * | p,
|  | vtkCamera * | cam,
|  | float * | rightV,
|  | float * | upV
| ) | `[protected]`

void vtkInteractorStyleUnicam::NormalizeMouseXY | ( | int | X,
|  | int | Y,
|  | float * | NX,
|  | float * | NY
| ) | `[protected]`

float vtkInteractorStyleUnicam::WindowAspect | ( |  | ) | `[protected]`

## Member Data Documentation

vtkWorldPointPicker* vtkInteractorStyleUnicam::InteractionPicker`[protected]`

| Definition at line 151 of file vtkInteractorStyleUnicam.h.

int vtkInteractorStyleUnicam::ButtonDown`[protected]`

| Definition at line 153 of file vtkInteractorStyleUnicam.h.

double vtkInteractorStyleUnicam::DTime`[protected]`

| Definition at line 154 of file vtkInteractorStyleUnicam.h.

double vtkInteractorStyleUnicam::Dist`[protected]`

| Definition at line 155 of file vtkInteractorStyleUnicam.h.

float vtkInteractorStyleUnicam::StartPix[2]`[protected]`

| Definition at line 156 of file vtkInteractorStyleUnicam.h.

float vtkInteractorStyleUnicam::LastPos[2]`[protected]`

| Definition at line 157 of file vtkInteractorStyleUnicam.h.

float vtkInteractorStyleUnicam::LastPix[2]`[protected]`

| Definition at line 158 of file vtkInteractorStyleUnicam.h.

float vtkInteractorStyleUnicam::DownPt[3]`[protected]`

| Definition at line 159 of file vtkInteractorStyleUnicam.h.

float vtkInteractorStyleUnicam::Center[3]`[protected]`

| Definition at line 160 of file vtkInteractorStyleUnicam.h.

float vtkInteractorStyleUnicam::WorldUpVector[3]`[protected]`

| Definition at line 162 of file vtkInteractorStyleUnicam.h.

vtkActor* vtkInteractorStyleUnicam::FocusSphere`[protected]`

| Definition at line 164 of file vtkInteractorStyleUnicam.h.

int vtkInteractorStyleUnicam::IsDot`[protected]`

| Definition at line 165 of file vtkInteractorStyleUnicam.h.

vtkRenderer* vtkInteractorStyleUnicam::FocusSphereRenderer`[protected]`

| Definition at line 166 of file vtkInteractorStyleUnicam.h.

int vtkInteractorStyleUnicam::state`[protected]`

| Definition at line 168 of file vtkInteractorStyleUnicam.h.

The documentation for this class was generated from the following file:

- Rendering/vtkInteractorStyleUnicam.h