Open Inventor Release 2024.1.1
 
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SoText2 Class Reference

Screen-aligned 2D text shape node. More...

#include <Inventor/nodes/SoText2.h>

+ Inheritance diagram for SoText2:

Public Types

enum  Justification {
  LEFT = 0x01 ,
  CENTER = 0x03 ,
  RIGHT = 0x02 ,
  INHERITED = 0x04
}
 Justification types. More...
 
- Public Types inherited from SoShape
enum  ShapeType {
  POINTS ,
  LINES ,
  POLYGONS ,
  TEXT
}
 Basic type for antialiased rendering for this shape (Do not consider the SoDrawStyle property currently in the state). More...
 

Public Member Functions

virtual SoType getTypeId () const
 Returns the type identifier for this specific instance.
 
 SoText2 ()
 Creates a 2D text node with default settings.
 
- Public Member Functions inherited from SoShape
virtual SbBool affectsState () const
 Overrides default method on SoNode.
 
ShapeType getShapeType ()
 Gets the current shape Full Scene Antialiasing type.
 
- 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 SoNodecopy (SbBool copyConnections=FALSE) const
 Creates and returns an exact copy of the node.
 
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 SoFieldgetField (const SbName &fieldName) const
 Returns a the field of this object whose name is fieldName.
 
virtual SoFieldgetEventIn (const SbName &fieldName) const
 Returns a the eventIn with the given name.
 
virtual SoFieldgetEventOut (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 SoShape
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SbBool isPrimitiveRestartAvailable (SoState *state=NULL)
 Returns TRUE if the primitive restart feature is available.
 
- Static Public Member Functions inherited from SoNode
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SoNodegetByName (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.
 

Public Attributes

SoMFString string
 The text string(s) to display.
 
SoSFFloat spacing
 Defines the distance (in the negative y direction) between the base points of successive strings, measured with respect to the current font height.
 
SoSFEnum justification
 Specifies horizontal alignment of strings.
 
- Public Attributes inherited from SoShape
SoSFBool boundingBoxIgnoring
 Whether to ignore this node during bounding box traversal.
 

Friends

class SoAnnoText3
 
class SoFontServer
 

Detailed Description

Screen-aligned 2D text shape node.

This node defines one or more strings of 2D text. The text is always horizontal, aligned with the screen and does not change size with distance from the camera. However the position of the text is specified in 3D units and is affected by viewing and modeling transformations. 2D text cannot be rotated, but because it always faces the user, it is often used for annotation, for example labels on axes.

The text position is always at the local origin (0,0,0). Rotations and scales have no effect on the orientation or size of 2D text, just the location.

Note: A transform node, e.g. SoTranslation, must be used to position the text in 3D space.

Text supports both single byte Latin1 (ISO8859-1) characters and multi-byte UNICODE characters. ISO8859-1 is an 8-bit character set which is a superset of the older 7-bit ASCII character set. See the SbString class for more information.

Rendering:

The typeface and size (default = 10) are specified using an SoFont node. Note that for SoText2 the size is interpreted as a value in pixels, not 3D units.

Setting the SoFont renderStyle field to TEXTURE is recommended for best appearance and performance. (antialiasing is applied).

Additional rendering styles can be applied using an SoTextProperty node, including underline, overline, strikethrough, background and background outline.

SoText2 is drawn using the diffuse color of the current material (SoMaterial). Lighting is not applied, regardless of the lighting model. Textures do not affect SoText2 (note this is independent of the fact that textures are used internally to render SoText2). Complexity (SoComplexity) does not affect SoText2. Drawing styles (SoDrawStyle) other than INVISIBLE do not affect SoText2.

Justification:

Horizontal alignment of the text can be specified using the justification field. Both horizontal and vertical alignment can be controlled using an SoTextProperty node, however the justification setting in the SoText2 node overrides the horizontal setting unless it is explicitly set to INHERITED.

Clipping:

If the transformed position (origin point) of the SoText2 is clipped, then the entire string is clipped, even if some part of the string should conceptually be visible. If the origin point is inside the view volume then the string is clipped similar to other geometry.

Bounding box:

Because 2D text is screen-aligned, it has some unusual characteristics. For example, the 3D bounding box surrounding a 2D text string depends on the current camera and the current viewport size, since changing the field of view or the mapping onto the window changes the relative size of the text with respect to the rest of the scene.

When computing the bounding box of a 2D text node (see SoGetBoundingBoxAction), be careful to:

  • Initialize the bounding box action with the correct viewport region.
    Typically this information is queried from the viewer.
  • Make sure the action will traverse the camera node.
    Apply the action to a node above the camera or create a path to the 2D text node from the root of the scene graph (e.g. using SoSearchAction).

Picking:

Text can be picked (SoRayPickAction) like any other geometry. If a text node has been picked then SoPickedPoint can return an SoTextDetail object. This object contains information about which string (in a multi-string text node) was picked and which character within the string was picked.

Render caching:

If your Open Inventor version is older than 9.2, then SoText2 nodes using CENTER or RIGHT justification cannot be render cached because the bounding box and justification offset depend on the camera. As a result, no SoSeparator above the SoText2 will be able to build a render cache or a bounding box cache and this can reduce performance. If possible put other geometry, that can be cached, under its own SoSeparator. SoText2 nodes using LEFT justification (the default) can be cached. Since Open Inventor 9.2, SoText2 nodes can be render cached in all cases.

Antialiasing:
Shape Antialiasing type is SoShape::TEXT.

Export limitations:

  • SoText2 can be exported to PDF3D/U3D (SoToPDFAction), but...
    due to limitations of that file format, the text will not be "screen locked".
  • SoText2 can be exported to various Hardcopy formats (SoVectorizeAction), but...
    native fonts are used, so the requested font name must be available on the rendering device.

FILE FORMAT/DEFAULT

    Text2 {
    string ""
    spacing 1
    justification LEFT
    }

ACTION BEHAVIOR

    SoGLRenderAction
    Draws text based on the current font, at a location based on the current transformation.

    SoRayPickAction
    Performs a pick on the text. Text will be picked if the picking ray intersects the bounding box of the strings. The string index and character position are available from the SoTextDetail.

    SoGetBoundingBoxAction
    Computes the bounding box that encloses the text.

SEE ALSO

SoFont, SoFullSceneAntialiasing, SoText3, SoTextDetail, SoTextProperty

Definition at line 194 of file SoText2.h.

Member Enumeration Documentation

◆ Justification

Justification types.

Enumerator
LEFT 

Left edges of all strings are aligned.

CENTER 

Centers of all strings are aligned.

RIGHT 

Right edges of all strings are aligned.

INHERITED 

The text justification is inherited from the current SoTextProperty::alignmentH value.

Definition at line 202 of file SoText2.h.

Constructor & Destructor Documentation

◆ SoText2()

SoText2::SoText2 ( )

Creates a 2D text node with default settings.

Member Function Documentation

◆ getClassTypeId()

static SoType SoText2::getClassTypeId ( )
static

Returns the type identifier for this class.


◆ getTypeId()

virtual SoType SoText2::getTypeId ( ) const
virtual

Returns the type identifier for this specific instance.

Reimplemented from SoShape.

Friends And Related Symbol Documentation

◆ SoAnnoText3

friend class SoAnnoText3
friend

Definition at line 283 of file SoText2.h.

◆ SoFontServer

friend class SoFontServer
friend

Definition at line 284 of file SoText2.h.

Member Data Documentation

◆ justification

SoSFEnum SoText2::justification

Specifies horizontal alignment of strings.

With LEFT justification, the left edge of the first line is at the (transformed) origin, and all left edges are aligned. RIGHT justification is similar. CENTER justification places the center of the first string at the (transformed) origin, with the centers of all remaining strings aligned under it. Use enum Justification. Default is LEFT.

Both horizontal and vertical alignment can be specified using an SoTextProperty node. However the justification setting in this node overrides the horizontal setting in SoTextProperty unless this field is set to INHERITED.

Definition at line 245 of file SoText2.h.

◆ spacing

SoSFFloat SoText2::spacing

Defines the distance (in the negative y direction) between the base points of successive strings, measured with respect to the current font height.

A value of 1 indicates single spacing, a value of 2 indicates double spacing, and so on.

Definition at line 232 of file SoText2.h.

◆ string

SoMFString SoText2::string

The text string(s) to display.

Each string will appear on its own line.

Definition at line 225 of file SoText2.h.


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