Class SoText2
- All Implemented Interfaces:
SafeDisposable
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 String 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. usingSoSearchAction
).
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:
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Nested Class Summary
Nested ClassesNested classes/interfaces inherited from class com.openinventor.inventor.nodes.SoShape
SoShape.ShapeTypes
Nested classes/interfaces inherited from class com.openinventor.inventor.nodes.SoNode
SoNode.RenderModes
Nested classes/interfaces inherited from class com.openinventor.inventor.Inventor
Inventor.ConstructorCommand
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Field Summary
FieldsModifier and TypeFieldDescriptionfinal SoSFEnum
<SoText2.Justifications> Specifies horizontal alignment of strings.final SoSFFloat
Defines the distance (in the negative y direction) between the base points of successive strings, measured with respect to the current font height.final SoMFString
The text string(s) to display.Fields inherited from class com.openinventor.inventor.nodes.SoShape
boundingBoxIgnoring
Fields inherited from class com.openinventor.inventor.Inventor
VERBOSE_LEVEL, ZeroHandle
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Constructor Summary
Constructors -
Method Summary
Methods inherited from class com.openinventor.inventor.nodes.SoShape
getShapeType, isPrimitiveRestartAvailable, isPrimitiveRestartAvailable
Methods inherited from class com.openinventor.inventor.nodes.SoNode
affectsState, callback, copy, copy, distribute, doAction, getAlternateRep, getBoundingBox, getByName, getMatrix, getPrimitiveCount, getRenderEngineMode, getRenderUnitID, GLRender, GLRenderBelowPath, GLRenderInPath, GLRenderOffPath, grabEventsCleanup, grabEventsSetup, handleEvent, isBoundingBoxIgnoring, isOverride, pick, rayPick, search, setOverride, touch, write
Methods inherited from class com.openinventor.inventor.fields.SoFieldContainer
copyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, set, setToDefaults
Methods inherited from class com.openinventor.inventor.misc.SoBase
dispose, getName, isDisposable, isSynchronizable, setName, setSynchronizable
Methods inherited from class com.openinventor.inventor.Inventor
getNativeResourceHandle
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Field Details
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string
The text string(s) to display. Each string will appear on its own line. -
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. -
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 enumJustification
. 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 inSoTextProperty
unless this field is set to INHERITED.
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Constructor Details
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SoText2
public SoText2()Creates a 2D text node with default settings.
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