Open Inventor Release 2024.2.1
 
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Public Member Functions | Static Public Member Functions | List of all members
SoLassoScreenDrawer Class Reference
Inventor » Drawers

VSG extension Interactively draw a lasso in normalized screen space. More...

#include <Inventor/drawers/SoLassoScreenDrawer.h>

+ Inheritance diagram for SoLassoScreenDrawer:

Public Member Functions

virtual SoType getTypeId () const
 Returns the type identifier for this specific instance.
 
 SoLassoScreenDrawer ()
 Constructor.
 
virtual void reset ()
 Clears the points in the line and resets internal state to initial values.
 
- Public Member Functions inherited from SoPolyLineScreenDrawer
 SoPolyLineScreenDrawer ()
 Constructor.
 
virtual void clear ()
 Convenience method to clear the points in the line.
 
- Public Member Functions inherited from SoScreenDrawer
 SoScreenDrawer ()
 Constructor.
 
- Public Member Functions inherited from SoNode
virtual void setOverride (const SbBool state)
 Turns the override flag on or off.
 
virtual SbBool isOverride () const
 Returns the state of the override flag.
 
virtual SoNode * copy (SbBool copyConnections=FALSE) const
 Creates and returns an exact copy of the node.
 
virtual SbBool affectsState () const
 Returns TRUE if a node has an effect on the state during traversal.
 
virtual void touch ()
 Marks an instance as modified, simulating a change to it.
 
- Public Member Functions inherited from SoFieldContainer
void setToDefaults ()
 Sets all fields in this object to their default values.
 
SbBool hasDefaultValues () const
 Returns TRUE if all of the object's fields have their default values.
 
SbBool fieldsAreEqual (const SoFieldContainer *fc) const
 Returns TRUE if this object's fields are exactly equal to fc's fields.
 
void copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
 Copies the contents of fc's fields into this object's fields.
 
SoNONUNICODE SbBool set (const char *fieldDataString)
 Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.
 
SbBool set (const SbString &fieldDataString)
 Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.
 
void get (SbString &fieldDataString)
 Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.
 
virtual int getFields (SoFieldList &list) const
 Appends references to all of this object's fields to resultList, and returns the number of fields appended.
 
virtual int getAllFields (SoFieldList &list) const
 Returns a list of fields, including the eventIn's and eventOut's.
 
virtual SoField * getField (const SbName &fieldName) const
 Returns a the field of this object whose name is fieldName.
 
virtual SoField * getEventIn (const SbName &fieldName) const
 Returns a the eventIn with the given name.
 
virtual SoField * getEventOut (const SbName &fieldName) const
 Returns the eventOut with the given name.
 
SbBool getFieldName (const SoField *field, SbName &fieldName) const
 Returns the name of the given field in the fieldName argument.
 
SbBool enableNotify (SbBool flag)
 Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).
 
SbBool isNotifyEnabled () const
 Notification is the process of telling interested objects that this object has changed.
 
virtual void setUserData (void *data)
 Sets application data.
 
void * getUserData (void) const
 Gets user application data.
 
- Public Member Functions inherited from SoBase
virtual SbName getName () const
 Returns the name of an instance.
 
virtual void setName (const SbName &name)
 Sets the name of an instance.
 
void setSynchronizable (const bool b)
 Sets this to be a ScaleViz synchronizable object.
 
bool isSynchronizable () const
 Gets the ScaleViz synchronizable state of this object.
 
- Public Member Functions inherited from SoRefCounter
void ref () const
 Adds a reference to an instance.
 
void unref () const
 Removes a reference from an instance.
 
void unrefNoDelete () const
 unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.
 
int getRefCount () const
 Returns current reference count.
 
void lock () const
 lock this instance.
 
void unlock () const
 unlock this instance.
 
- Public Member Functions inherited from SoTypedObject
SbBool isOfType (const SoType &type) const
 Returns TRUE if this object is of the type specified in type or is derived from that type.
 
template<typename TypedObjectClass >
SbBool isOfType () const
 Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.
 

Static Public Member Functions

static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoPolyLineScreenDrawer
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoScreenDrawer
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoNode
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SoNode * getByName (const SbName &name)
 A node's name can be set using SoBase::setName().
 
static int getByName (const SbName &name, SoNodeList &list)
 A node's name can be set using SoBase::setName().
 
- Static Public Member Functions inherited from SoFieldContainer
static SoType getClassTypeId ()
 Returns the type of this class.
 
- Static Public Member Functions inherited from SoBase
static SoType getClassTypeId ()
 Returns type identifier for this class.
 
- Static Public Member Functions inherited from SoTypedObject
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 

Additional Inherited Members

- Public Attributes inherited from SoPolyLineScreenDrawer
SoSFUInt32 simplificationThreshold
 Threshold (in pixels) used to simplify line when it is finished.
 
SoSFBool doCCW
 Make the line counter-clockwise when it is finalized.
 
SoSFColor color
 Color of line.
 
SoMFVec2f point
 Points of line.
 
SoSFBool isClosed
 Close the line during display (connect last point to first point).
 
SoSFUShort linePattern
 Stipple pattern.
 
SoSFInt32 linePatternScaleFactor
 Stipple pattern scale factor.
 
SoSFFloat lineWidth
 Width of lines.
 
SbEventHandler< const EventArg & > onStart
 Event raised when starting to draw a polyline.
 
SbEventHandler< const EventArg & > onMove
 Event raised during polyline drawing.
 
SbEventHandler< EventArg & > onFinish
 Event raised when the line is finished.
 
- Public Attributes inherited from SoScreenDrawer
SoSFNode sceneGraph
 Scene graph to render.
 

Detailed Description

VSG extension Interactively draw a lasso in normalized screen space.

This class can be used to interactively draw a lasso (freeform shape) on screen.

When the lasso is finished, an event is raised to notify the application (see SoPolyLineScreenDrawer::onFinish ). Points are returned as normalized coordinates in the range -1..1, which is conveniently the default view volume for an SoOrthographicCamera node.

The line color and simplification threshold are specified by fields in the parent class SoPolyLineScreenDrawer.

Please see SoPolyLineScreenDrawer for general notes and code example.

Lasso specific notes:

  • The simplificationThreshold field does apply to this node.
  • If user finishes a lasso, then the next click will automatically clear the polyline (begin a new lasso).
  • SbEventHandlers:
    • OnStart : Triggered on LeftMouseDown input event.
    • OnMove : Triggered on MouseMove input events (after Start).
    • OnFinish : Triggered on LeftMouseUp input event.

[C++]
Screen drawer classes must be initialized by calling SoInteraction::init(). High level viewer init methods, like SoWin::init(), automatically do this. However, if the application is calling SoDB::init() directly, then it is usually necessary to also call SoInteraction::init() before using the screen drawer classes.

USAGE

    • Press left mouse and drag to draw the lasso.
    • Release to finish the lasso.
    • Press Escape to cancel construction of the lasso.

FILE FORMAT/DEFAULT

    LassoScreenDrawer {
    point []
    color 1 0 0
    simplificationThreshold 5
    isClosed TRUE
    }

SEE ALSO

SoEllipseScreenDrawer, SoPolyLineScreenDrawer, SoPolygonScreenDrawer, SoRectangleScreenDrawer

Definition at line 87 of file SoLassoScreenDrawer.h.

Constructor & Destructor Documentation

◆ SoLassoScreenDrawer()

SoLassoScreenDrawer::SoLassoScreenDrawer ( )

Constructor.

Member Function Documentation

◆ getClassTypeId()

static SoType SoLassoScreenDrawer::getClassTypeId ( )
static

Returns the type identifier for this class.


◆ getTypeId()

virtual SoType SoLassoScreenDrawer::getTypeId ( ) const
virtual

Returns the type identifier for this specific instance.

Reimplemented from SoPolyLineScreenDrawer.

◆ reset()

virtual void SoLassoScreenDrawer::reset ( )
virtual

Clears the points in the line and resets internal state to initial values.

This cancels any current drawing.

Since Open Inventor 10.7.3

Reimplemented from SoPolyLineScreenDrawer.

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