Main Page   Namespace List   Class Hierarchy   Compound List   File List   Namespace Members   Compound Members  

OGLFT::Solid Class Reference

Render text as solid letters. More...

#include <OGLFT.h>

Inheritance diagram for OGLFT::Solid:

OGLFT::Filled OGLFT::Polygonal OGLFT::Face List of all members.

Public Methods

 Solid (const char *filename, float point_size=12, FT_UInt resolution=100)
 Solid (FT_Face face, float point_size=12, FT_UInt resolution=100)
 ~Solid (void)
void setDepth (double depth)
double depth (void) const

Detailed Description

Render text as solid letters.

solid_class.png
Each glyph is drawn as a closed solid. The contours are extracted from the font file through FreeType. FreeType is used to scale the contours to the given size. The contours are passed to the GLE tubing and extrusion library to create the sides of the solid. Then the GLU tessellation routines are used to tessellate the contours into polygons which are used to cap the sides.

Currently, the solids are drawn only in the foreground color. However, proper surface normals are computed so that the solids may be lighted. Eventually, you'll be able to supply a color/texture coordinate function to make glyphs more interesting. Note that you can use the per-glyph display list functionality to alter each glyph individually.

Another TODO item is to improve the interaction with GLE. Currently, you can only create block solids. Eventually, we'll have the capability add bevels and rounds to the edges of the solids and maybe even more general extrusions (like, for example, the swooshing letters in the title sequence of the Salkind's 1978 "Superman" movie).

The only complexity to this style is selecting the point size. Since the glyphs are drawn as a collection of 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.


Constructor & Destructor Documentation

OGLFT::Solid::Solid const char *    filename,
float    point_size = 12,
FT_UInt    resolution = 100
 

Parameters:
filename  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::Solid::Solid 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::Solid::~Solid void   
 

The destructor doesn't do anything in particular.


Member Function Documentation

double OGLFT::Solid::depth void    const [inline]
 

Returns:
the solid extrusion depth.

void OGLFT::Solid::setDepth double    depth
 

Set the thickness of the solid

Parameters:
depth  thickness of the solid in model units.


The documentation for this class was generated from the following files:
Generated on Wed Oct 1 10:39:03 2003 for OGLFT by doxygen1.2.18