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OGLFT::Filled Class Reference

Render text as a filled polygons. More...

#include <OGLFT.h>

Inheritance diagram for OGLFT::Filled::

List of all members.

Public Methods
	Filled (const char *filename, float point_size=12, FT_UInt resolution=100)
	Filled (FT_Face face, float point_size=12, FT_UInt resolution=100)
virtual	~Filled (void)
VertexInfoList&	extraVertices (void)
Protected Methods
void	renderGlyph (FT_Face face, FT_UInt glyph_index)
	Each style implements its own glyph rendering routine. Parameters: face   the FT_Face containing the glyph. glyph_index   the index of the glyph in face.
Protected Attributes
GLfloat	depth_offset_
	Offset the glyph in the Z direction. Solely for the Solid subclass. Until I can figure out how to shift the glyph outside the context of this class, I guess this has got to stay (but it is redundant to extrusion_.depth_).

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Detailed Description

Render text as a filled polygons.

Each glyph is drawn as a filled polygon. The contours are extracted from the font file through FreeType. FreeType is used to scale the contours to the given size. Then the GLU tessellation routines are used to tessellate the contours into polygons (well, triangles). By default, these are drawn in GL_FILL polygon mode, but any other polygon mode can be specified.

Usually, the polygons are drawn only in the foreground color, however, you may supply ColorTess and TextureTess objects which can alter the color or texture coordinates of each vertex individually. You can also use the per-glyph display list functionality to alter the attributes of each glyph.

The only complexity to this style is selecting the point size. Since the glyphs are drawn as polygons, they are subject to the viewing and modeling transformations. The point size is nominally chosen to be the same as a raster image generated at the given resolution. Some experimentation with point size and resolution may be necessary to achieve the desired results.

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Constructor & Destructor Documentation

OGLFT::Filled::Filled ( const char * filename, float point_size = 12, FT_UInt resolution = 100 )

Parameters: file   the filename which contains the font face. point_size   the initial point size of the font to generate. A point is essentially 1/72th of an inch. Defaults to 12. resolution   the pixel density of the display in dots per inch (DPI). Defaults to 100 DPI.

OGLFT::Filled::Filled ( FT_Face face, float point_size = 12, FT_UInt resolution = 100 )

Parameters: face   open FreeType FT_Face. point_size   the initial point size of the font to generate. A point is essentially 1/72th of an inch. Defaults to 12. resolution   the pixel density of the display in dots per inch (DPI). Defaults to 100 DPI.

OGLFT::Filled::~Filled ( void ) [virtual]

The destructor deletes the GLU tessellation object allocated in in the constructor.

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Member Function Documentation

VertexInfoList & OGLFT::Filled::extraVertices ( void ) [inline]

Returns: the list of extra vertices created by the GLU tessellation combine callback.

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

• OGLFT.h
• OGLFT.cpp

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