365 lines
13 KiB
C++
365 lines
13 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGTEXT_TEXT
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#define OSGTEXT_TEXT 1
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#include <osg/Drawable>
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#include <osg/Quat>
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#include <osgText/Font>
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#include <osgText/String>
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namespace osgText {
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class OSGTEXT_EXPORT Text : public osg::Drawable
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{
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public:
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Text();
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Text(const Text& text,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
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virtual osg::Object* cloneType() const { return new Text(); }
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virtual osg::Object* clone(const osg::CopyOp& copyop) const { return new Text(*this,copyop); }
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virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Text*>(obj)!=NULL; }
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virtual const char* className() const { return "Text"; }
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virtual const char* libraryName() const { return "osgText"; }
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/** Set the Font to use to render the text.
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* setFont(0) sets the use of the default font.*/
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void setFont(Font* font=0);
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/** Set the font, loaded from the specified front file, to use to render the text,
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* setFont("") sets the use of the default font.
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* See the osgText::readFontFile function for how the font file will be located. */
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void setFont(const std::string& fontfile);
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/** Get the font. Return 0 if default is being used.*/
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const Font* getFont() const { return _font.get(); }
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/** Set the Font reference width and height resolution in texels.
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* Note, the size may not be supported by current font,
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* the closest supported font size will be selected.*/
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void setFontResolution(unsigned int width, unsigned int height);
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unsigned int getFontWidth() const { return _fontWidth; }
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unsigned int getFontHeight() const { return _fontHeight; }
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/** Set the text using a osgText::String.*/
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void setText(const String& text);
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/** Set the text using a std::string,
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* which is converted to an internal TextString.*/
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void setText(const std::string& text);
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/** Set the text using a Unicode encoded std::string, which is converted to an internal TextString.
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* The encoding parameter specificies which Unicode encodeding is used in the std::string. */
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void setText(const std::string& text,String::Encoding encoding);
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/** Set the text using a wchar_t string,
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* which is converted to an internal TextString.*/
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void setText(const wchar_t* text);
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/** Get the text string.
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* Note, if you modify the string you must call Text::update() for
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* the internal glyph reprentation to be updated.*/
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String& getText() { return _text; }
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/** Get the const text string.*/
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const String& getText() const { return _text; }
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/** update internal glyph respresnetation used for rendering,
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* and bounding volume.*/
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void update() { computeGlyphRepresentation(); }
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/** Set the rendered character size in object coordinates.*/
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void setCharacterSize(float height,float aspectRatio=1.0f);
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float getCharacterHeight() const { return _characterHeight; }
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float getCharacterAspectRatio() const { return _characterAspectRatio; }
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enum CharacterSizeMode
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{
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OBJECT_COORDS, /// default
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SCREEN_COORDS, /// internally scale the characters to be constant screen size.
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OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT /// text that behavaves like OBJECT_COORDS sized text when a long distance way, but has its screen sized capped automatically when the viewer gets near.
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};
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/** Set how the CharacterSize value relates to the final rendered character.*/
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void setCharacterSizeMode(CharacterSizeMode mode) { _characterSizeMode = mode; }
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/** Get the CharacterSizeMode.*/
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CharacterSizeMode getCharacterSizeMode() const { return _characterSizeMode; }
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/** Set the maximum width of the text box.
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* With horizontal layouts any characters which do not fit are wrapped around.
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* 0 or negative values indicate that no maximum width is set, lines can be as long as
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* they need be to fit thre required text*/
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void setMaximumWidth(float maximumWidth);
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/** Get the maximim width of the text box.*/
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float getMaximumWidth() const { return _maximumWidth; }
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/** Set the maximum height of the text box.
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* With horizontal layouts any characters which do not fit are wrapped around.
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* 0 or negative values indicate that no maximum height is set, lines can be as long as
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* they need be to fit thre required text*/
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void setMaximumHeight(float maximumHeight);
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/** Get the maximum height of the text box.*/
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float getMaximumHeight() const { return _maximumHeight; }
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/** Set the position of text.*/
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void setPosition(const osg::Vec3& pos);
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/** Get the position of text.*/
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const osg::Vec3& getPosition() const { return _position; }
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enum AlignmentType
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{
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LEFT_TOP,
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LEFT_CENTER,
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LEFT_BOTTOM,
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CENTER_TOP,
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CENTER_CENTER,
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CENTER_BOTTOM,
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RIGHT_TOP,
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RIGHT_CENTER,
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RIGHT_BOTTOM,
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LEFT_BASE_LINE,
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CENTER_BASE_LINE,
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RIGHT_BASE_LINE,
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LEFT_BOTTOM_BASE_LINE,
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CENTER_BOTTOM_BASE_LINE,
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RIGHT_BOTTOM_BASE_LINE,
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BASE_LINE = LEFT_BASE_LINE /// default.
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};
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void setAlignment(AlignmentType alignment);
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AlignmentType getAlignment() const { return _alignment; }
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enum AxisAlignment
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{
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XY_PLANE,
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REVERSED_XY_PLANE,
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XZ_PLANE,
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REVERSED_XZ_PLANE,
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YZ_PLANE,
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REVERSED_YZ_PLANE,
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SCREEN
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};
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void setAxisAlignment(AxisAlignment axis);
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void setRotation(const osg::Quat& quat);
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const osg::Quat& getRotation() const { return _rotation; }
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void setAutoRotateToScreen(bool autoRotateToScreen);
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bool getAutoRotateToScreen() const { return _autoRotateToScreen; }
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enum Layout
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{
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LEFT_TO_RIGHT, /// default
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RIGHT_TO_LEFT,
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VERTICAL
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};
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void setLayout(Layout layout);
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Layout getLayout() const { return _layout; }
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void setColor(const osg::Vec4& color);
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const osg::Vec4& getColor() const { return _color; }
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enum DrawModeMask
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{
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TEXT = 1, /// default
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BOUNDINGBOX = 2,
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ALIGNMENT = 4
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};
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void setDrawMode(unsigned int mode);
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unsigned int getDrawMode() const { return _drawMode; }
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void setKerningType(KerningType kerningType) { _kerningType = kerningType; }
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KerningType getKerningType() const { return _kerningType; }
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/** Get the number of wrapped lines - only valid after computeGlyphRepresentation() has been called, returns -1 otherwise */
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unsigned int getLineCount() { return _lineCount; }
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/** Draw the text.*/
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virtual void drawImplementation(osg::State& state) const;
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/** return false, osgText::Text does not support accept(AttributeFunctor&).*/
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virtual bool supports(const osg::Drawable::AttributeFunctor&) const { return false; }
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/** return true, osgText::Text does support accept(ConstAttributeFunctor&).*/
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virtual bool supports(const osg::Drawable::ConstAttributeFunctor&) const { return true; }
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/** accept an ConstAttributeFunctor and call its methods to tell it about the interal attributes that this Drawable has.*/
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virtual void accept(osg::Drawable::ConstAttributeFunctor& af) const;
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/** return true, osgText::Text does support accept(PrimitiveFunctor&) .*/
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virtual bool supports(const osg::PrimitiveFunctor&) const { return true; }
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/** accept a PrimtiveFunctor and call its methods to tell it about the interal primtives that this Drawable has.*/
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virtual void accept(osg::PrimitiveFunctor& pf) const;
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/** If State is non-zero, this function releases OpenGL objects for
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* the specified graphics context. Otherwise, releases OpenGL objexts
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* for all graphics contexts. */
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virtual void releaseGLObjects(osg::State* state=0) const;
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// make Font a friend to allow it set the _font to 0 if the font is
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// forcefully unloaded.
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friend class Font;
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public:
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// internal structures, variable and methods used for rendering of characters.
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struct OSGTEXT_EXPORT GlyphQuads
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{
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typedef std::vector<Font::Glyph*> Glyphs;
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typedef std::vector<unsigned int> LineNumbers;
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typedef std::vector<osg::Vec2> Coords2;
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typedef std::vector<osg::Vec3> Coords3;
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typedef std::vector<osg::Vec2> TexCoords;
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Glyphs _glyphs;
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Coords2 _coords;
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osg::buffered_object<Coords3> _transformedCoords;
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TexCoords _texcoords;
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LineNumbers _lineNumbers;
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Glyphs getGlyphs() { return _glyphs; }
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const Glyphs getGlyphs() const { return _glyphs; }
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Coords2& getCoords() { return _coords; }
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const Coords2& getCoords() const { return _coords; }
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Coords3& getTransformedCoords(unsigned int contexID) { return _transformedCoords[contexID]; }
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const Coords3& getTransformedCoords(unsigned int contexID) const { return _transformedCoords[contexID]; }
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TexCoords& getTexCoords() { return _texcoords; }
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const TexCoords& getTexCoords() const { return _texcoords; }
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LineNumbers& getLineNumbers() { return _lineNumbers; }
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const LineNumbers& getLineNumbers() const { return _lineNumbers; }
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};
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typedef std::map<osg::ref_ptr<osg::StateSet>,GlyphQuads> TextureGlyphQuadMap;
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/** Direct Access to GlyphQuads */
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const GlyphQuads* getGlyphQuads(osg::StateSet* stateSet) const
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{
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TextureGlyphQuadMap::iterator itGlyphQuad = _textureGlyphQuadMap.find(stateSet);
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if (itGlyphQuad == _textureGlyphQuadMap.end()) return NULL;
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return &itGlyphQuad->second;
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}
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const TextureGlyphQuadMap& getTextureGlyphQuadMap() const
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{
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return _textureGlyphQuadMap;
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}
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virtual osg::BoundingBox computeBound() const;
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protected:
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virtual ~Text();
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Font* getActiveFont();
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const Font* getActiveFont() const;
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String::iterator computeLastCharacterOnLine(osg::Vec2& cursor, String::iterator first,String::iterator last);
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// members which have public access.
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osg::ref_ptr<Font> _font;
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unsigned int _fontWidth;
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unsigned int _fontHeight;
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float _characterHeight;
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float _characterAspectRatio;
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CharacterSizeMode _characterSizeMode;
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float _maximumWidth;
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float _maximumHeight;
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String _text;
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osg::Vec3 _position;
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AlignmentType _alignment;
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osg::Quat _rotation;
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bool _autoRotateToScreen;
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Layout _layout;
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osg::Vec4 _color;
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unsigned int _drawMode;
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KerningType _kerningType;
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unsigned int _lineCount;
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// iternal map used for rendering. Set up by the computeGlyphRepresentation() method.
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mutable TextureGlyphQuadMap _textureGlyphQuadMap;
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void computeGlyphRepresentation();
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// internal caches of the positioning of the text.
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struct AutoTransformCache
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{
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AutoTransformCache():
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_traversalNumber(-1),
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_width(0),
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_height(0) {}
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int _traversalNumber;
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int _width;
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int _height;
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osg::Vec3 _transformedPosition;
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osg::Matrix _modelview;
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osg::Matrix _projection;
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osg::Matrix _matrix;
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};
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mutable osg::buffered_object<AutoTransformCache> _autoTransformCache;
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mutable osg::Vec3 _offset;
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mutable osg::Vec3 _normal;
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mutable osg::BoundingBox _textBB;
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void computePositions();
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void computePositions(unsigned int contextID) const;
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};
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}
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#endif
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