FGFS-4.1/OpenSceneGraph
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Added Text::getCharacterCorners(...) method to help applications that want to find out the positions of characters being rendered.

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This commit is contained in:
Robert Osfield 2017-11-21 13:41:57 +00:00
parent d60b9714fe
commit 7f97b9f999
3 changed files with 23 additions and 4 deletions
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4
include/osgText/Text
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@ -182,9 +182,13 @@ public:
virtual void accept(osg::PrimitiveFunctor& pf) const;
/** Get the coordinates of the character corners in local coordinates. Use Text::getMatrix() or Text::computeMatrix(..) to get the transform into model coordinates (see TextBase header.) */
bool getCharacterCorners(unsigned int index, osg::Vec3& bottomLeft, osg::Vec3& bottomRight, osg::Vec3& topLef, osg::Vec3& topRight) const;
/** Resize any per context GLObject buffers to specified size. */
virtual void resizeGLObjectBuffers(unsigned int maxSize);
/** If State is non-zero, this function releases OpenGL objects for
* the specified graphics context. Otherwise, releases OpenGL objexts
* for all graphics contexts. */

8
include/osgText/TextBase
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@ -279,10 +279,12 @@ public:
void getCoord(unsigned int i, osg::Vec2& c) const { c.set((*_coords)[i].x(), (*_coords)[i].y()); }
void getCoord(unsigned int i, osg::Vec3& c) const { c = (*_coords)[i]; }
/** Get the internal matrix used to provide positioning of text.*/
/** Get the cached internal matrix used to provide positioning of text. The cached matrix is originally computed by computeMatrix(..). */
const osg::Matrix& getMatrix() const { return _matrix; }
/** compute the matrix that positions the text in model space for the given viewpoint.*/
bool computeMatrix(osg::Matrix& matrix, osg::State* state=0) const;
protected:
virtual ~TextBase();
@ -295,8 +297,6 @@ protected:
osg::VertexArrayState* createVertexArrayState(osg::RenderInfo& renderInfo) const;
bool computeMatrix(osg::Matrix& matrix, osg::State* state=0) const;
void positionCursor(const osg::Vec2 & endOfLine_coords, osg::Vec2 & cursor, unsigned int linelength);
String::iterator computeLastCharacterOnLine(osg::Vec2& cursor, String::iterator first,String::iterator last);
void computePositions();

15
src/osgText/Text.cpp
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@ -1301,6 +1301,21 @@ void Text::accept(osg::PrimitiveFunctor& pf) const
}
}
bool Text::getCharacterCorners(unsigned int index, osg::Vec3& bottomLeft, osg::Vec3& bottomRight, osg::Vec3& topLeft, osg::Vec3& topRight) const
{
if (_coords) return false;
if ((index*4+4)>static_cast<unsigned int>(_coords->size())) return false;
unsigned int base = index*4;
topLeft = (*_coords)[base];
bottomLeft = (*_coords)[base+1];
bottomRight = (*_coords)[base+2];
topRight = (*_coords)[base+3];
return true;
}
void Text::resizeGLObjectBuffers(unsigned int maxSize)
{
TextBase::resizeGLObjectBuffers(maxSize);