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OGLFT::Texture Class Reference

This is the base class of the texture style. More...

#include <OGLFT.h>

Inheritance diagram for OGLFT::Texture::

List of all members.

Public Methods
	Texture (const char *filename, float point_size=12, FT_UInt resolution=100)
	Texture (FT_Face face, float point_size=12, FT_UInt resolution=100)
virtual	~Texture (void)
void	setCharacterRotationX (GLfloat character_rotation_x)
void	setCharacterRotationY (GLfloat character_rotation_y)
void	setCharacterRotationZ (GLfloat character_rotation_z)
GLfloat	characterRotationX (void) const
GLfloat	characterRotationY (void) const
GLfloat	characterRotationZ (void) const
double	height (void) const
BBox	measure (unsigned char c)
BBox	measure (const QChar c)
BBox	measure (const char *s)
BBox	measure (const QString &format, double number)
Protected Types
typedef std::map< FT_UInt, TextureInfo >	GlyphTexObjs
	Type of the cache of defined glyph to texture objects mapping.
typedef GlyphTexObjs::const_iterator	GTOCI
	A convenience definition of the iterator over the glyph to texture object map.
typedef GlyphTexObjs::iterator	GTOI
	A convenience definition of the iterator over the glyph to texture object map.
Protected Methods
unsigned int	nearestPowerCeil (unsigned int a)
virtual void	bindTexture (FT_Face face, FT_UInt glyph_index)=0
Protected Attributes
struct {
bool   active_
GLfloat   x_
GLfloat   y_
GLfloat   z_
}	character_rotation_
	Angle of rotation of characters relative to text orientation.
GlyphTexObjs	glyph_texobjs_
	Cache of defined glyph texture objects.

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Detailed Description

This is the base class of the texture style.

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Constructor & Destructor Documentation

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

The texture destructor doesn't really do anything.

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Member Function Documentation

void OGLFT::Texture::bindTexture ( FT_Face face, FT_UInt glyph_index ) [protected, pure virtual]

This is all that distinguishes the various texture styles. Each subclass defines this method as appropriate. Once the texture is bound, it is rendered the same in all cases. Parameters: face   FT_Face containing the glyph to render. glyph_index   index of glyph in face.

GLfloat OGLFT::Texture::characterRotationX ( void ) const [inline]

Returns: the character rotation in the X direction.

GLfloat OGLFT::Texture::characterRotationY ( void ) const [inline]

Returns: the character rotation in the Y direction.

GLfloat OGLFT::Texture::characterRotationZ ( void ) const [inline, virtual]

Returns: the character rotation in the Z direction. Reimplemented from OGLFT::Face.

double OGLFT::Texture::height ( void ) const [virtual]

Returns: the height (i.e., line spacing) at the current character size. Reimplemented from OGLFT::Face.

BBox OGLFT::Texture::measure ( const QString & format, double number ) [inline, virtual]

Implement measuring a formatted number Parameters: format   the format string number   to value to format Returns: the bounding box of the formatted number Reimplemented from OGLFT::Face.

BBox OGLFT::Texture::measure ( const char * s ) [inline, virtual]

Measure a string of characters. Note: currently, this merely calls Face's measure routine. Parameters: s   string of (latin1) characters to measure Returns: the bounding box of s. Reimplemented from OGLFT::Face.

BBox OGLFT::Texture::measure ( const QChar c ) [virtual]

Implement measuring a character in a texture face. Parameters: c   the (UNICODE) character to measure Returns: the bounding box of c. Reimplemented from OGLFT::Face.

BBox OGLFT::Texture::measure ( unsigned char c ) [virtual]

Implement measuring a character in a texture face. Parameters: c   the (latin1) character to measure Returns: the bounding box of c. Reimplemented from OGLFT::Face.

unsigned int OGLFT::Texture::nearestPowerCeil ( unsigned int a ) [protected]

OpenGL texture maps have to be a power of 2 in width and height (including apparently 1 = 2**0 ). This function returns the next higher power of 2 of the argument. If the argument is already a power of 2, you just get that back. Parameters: a   width or height of an image. Returns: value of a rounded to nearest, higher power of 2.

void OGLFT::Texture::setCharacterRotationX ( GLfloat character_rotation_x )

Set the individual character rotation in the X direction. Parameters: character_rotation_x   angle in degrees of X rotation.

void OGLFT::Texture::setCharacterRotationY ( GLfloat character_rotation_y )

Set the individual character rotation in the Y direction. Parameters: character_rotation_y   angle in degrees of Y rotation.

void OGLFT::Texture::setCharacterRotationZ ( GLfloat character_rotation_z ) [virtual]

Set the individual character rotation in the Z direction. Parameters: character_rotation_z   angle in degrees of Z rotation. Reimplemented from OGLFT::Face.

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Member Data Documentation

bool OGLFT::Texture::active_

Is character rotation non-zero? (faster than checking all the other values.).

GLfloat OGLFT::Texture::x_

Angle of rotation in the X direction.

GLfloat OGLFT::Texture::y_

Angle of rotation in the Y direction.

GLfloat OGLFT::Texture::z_

Angle of rotation in the Z direction.

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

• OGLFT.h
• OGLFT.cpp

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