SoAsciiText.3coin4 - Man Page

The SoAsciiText class renders flat 3D text.


#include <Inventor/nodes/SoAsciiText.h>

Inherits SoShape.

Public Types

enum Justification { LEFT = 1, RIGHT, CENTER }

Public Member Functions

virtual SoType getTypeId (void) const
Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.
SoAsciiText (void)
virtual void GLRender (SoGLRenderAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)
static void initClass (void)

Public Attributes

SoMFString string
SoSFFloat spacing
SoSFEnum justification
SoMFFloat width

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const
virtual ~SoAsciiText ()
virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center)
virtual void generatePrimitives (SoAction *)
virtual SoDetail * createTriangleDetail (SoRayPickAction *action, const SoPrimitiveVertex *v1, const SoPrimitiveVertex *v2, const SoPrimitiveVertex *v3, SoPickedPoint *pp)
virtual void notify (SoNotList *list)

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

Detailed Description

The SoAsciiText class renders flat 3D text.

The text is rendered using 3D polygon geometry.

The size of the textual geometry representation is decided from the SoFont::size field of a preceding SoFont-node in the scene graph, which specifies the size in unit coordinates. This value sets the approximate vertical size of the letters. The default value if no SoFont-nodes are used, is 10.

The complexity of the glyphs is controlled by a preceding SoComplexity node with Type set to OBJECT_SPACE. Please note that the default builtin 3D font will not be affected by the SoComplexity node.

This node is different from the SoText2 node in that it rotates, scales, translates etc just like other geometry in the scene. It is different from the SoText3 node in that it renders the text 'flat', i.e. does not extrude the fonts to have depth.

To get an intuitive feeling for how SoAsciiText works, take a look at this sample Inventor file in examinerviewer:

#Inventor V2.1 ascii

Separator {
  Font {
    size 10
    name 'Arial:Bold Italic'

  BaseColor {
    rgb 1 0 0 #red
  AsciiText {
    width [ 0, 1, 50 ]
    justification LEFT #Standard alignment
    string [ 'LEFT', 'LEFT', 'LEFT', 'LEFT', 'LEFT LEFT' ]
  BaseColor { 
    rgb 1 1 0
  Sphere { radius 1.5 }

  Translation {
    translation 0 -50 0
  BaseColor {
    rgb 0 1 0 #green
  AsciiText {
    width [ 0, 1, 50 ]
    justification RIGHT
    string [ 'RIGHT', 'RIGHT', 'RIGHT', 'RIGHT', 'RIGHT RIGHT' ]
  BaseColor { 
    rgb 0 1 1
  Sphere { radius 1.5 }

  Translation {
    translation 0 -50 0
  BaseColor {
    rgb 0 0 1 #blue
  AsciiText {
    width [ 0, 1, 50 ]
    justification CENTER
  BaseColor { 
    rgb 1 0 1
  Sphere { radius 1.5 }

In examinerviewer the Inventor file looks something like this:



AsciiText {
    string ""
    spacing 1
    justification LEFT
    width 0

SGI Inventor 2.1

Member Enumeration Documentation

enum SoAsciiText::Justification

The font justification values control the text alignment. Justification can have three distinct values. The default value is SoAsciiText::LEFT, and the strings are rendered with a common left border. The second value is SoAsciiText::RIGHT, and renders the strings with a common right border. The last value is SoAsciiText::CENTER, in which the strings are rendered with their centers aligned. The origo of the three alignments are respectively left, right and center, located at the baseline of the first line of text.



The strings are left-aligned; rendered with a common left border. This is the default alignment.


The strings are right-aligned; rendered with a common right border.


The text is center-aligned; all strings are centered.

Constructor & Destructor Documentation

SoAsciiText::SoAsciiText (void)


SoAsciiText::~SoAsciiText () [protected], [virtual]


Member Function Documentation

SoType SoAsciiText::getTypeId (void) const [virtual]

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting. Usage example:

void foo(SoNode * node)
  if (node->getTypeId() == SoFile::getClassTypeId()) {
    SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Reimplemented from SoShape.

const SoFieldData * SoAsciiText::getFieldData (void) const [protected], [virtual]

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoShape.

void SoAsciiText::GLRender (SoGLRenderAction * action) [virtual]

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoShape.

void SoAsciiText::getPrimitiveCount (SoGetPrimitiveCountAction * action) [virtual]

Action method for the SoGetPrimitiveCountAction.

Calculates the number of triangle, line segment and point primitives for the node and adds these to the counters of the action.

Nodes influencing how geometry nodes calculates their primitive count also overrides this method to change the relevant state variables.

Reimplemented from SoShape.

void SoAsciiText::computeBBox (SoAction * action, SbBox3f & box, SbVec3f & center) [protected], [virtual]

Implemented by SoShape subclasses to let the SoShape superclass know the exact size and weighted center point of the shape's bounding box.

The bounding box and center point should be calculated and returned in the local coordinate system.

The method implements action behavior for shape nodes for SoGetBoundingBoxAction. It is invoked from SoShape::getBoundingBox(). (Subclasses should not override SoNode::getBoundingBox().)

The box parameter sent in is guaranteed to be an empty box, while center is undefined upon function entry.

Implements SoShape.

void SoAsciiText::generatePrimitives (SoAction * action) [protected], [virtual]

The method implements action behavior for shape nodes for SoCallbackAction. It is invoked from SoShape::callback(). (Subclasses should not override SoNode::callback().)

The subclass implementations uses the convenience methods SoShape::beginShape(), SoShape::shapeVertex(), and SoShape::endShape(), with SoDetail instances, to pass the primitives making up the shape back to the caller.

Implements SoShape.

SoDetail * SoAsciiText::createTriangleDetail (SoRayPickAction * action, const SoPrimitiveVertex * v1, const SoPrimitiveVertex * v2, const SoPrimitiveVertex * v3, SoPickedPoint * pp) [protected], [virtual]

Will create triangle detail for a SoPickedPoint. This method will only be called internally, when generatePrimitives() is used for picking (SoShape::rayPick() is not overridden).

This method returns NULL in Open Inventor, and subclasses will need to override this method to create details for a SoPickedPoint.

This is not necessary with Coin. Of course, if you choose to override it, it will work in the same way as Open Inventor.

For this to work, you must supply a face or line detail when generating primitives. If you supply NULL for the detail argument in SoShape::beginShape(), you'll have to override this method.

Reimplemented from SoShape.

void SoAsciiText::notify (SoNotList * l) [protected], [virtual]

Notifies all auditors for this instance when changes are made.

Reimplemented from SoShape.

Member Data Documentation

SoMFString SoAsciiText::string

Lines of text to render. Several strings can be specified for this multifield, where each string represents a line.

Default value is a single empty string.

SoSFFloat SoAsciiText::spacing

Spacing between each line. Defaults to 1.0.

SoSFEnum SoAsciiText::justification

Horizontal alignment. Default SoAsciiText::LEFT.

SoMFFloat SoAsciiText::width

Defines the width of each line. The text is scaled to be within the specified units. The size of the characters will remain the same; only the the x-positions are scaled. When width <= 0, the width value is ignored and the text rendered as normal. The exact width of the rendered text depends not only on the width field, but also on the maximum character width in the rendered string. The string will be attempted to fit within the specified width, but if it is unable to do so, it uses the largest character in the string as the width. If fewer widths are specified than the number of strings, the strings without matching widths are rendered with default width.


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Wed Jul 20 2022 Version 4.0.0 Coin