OpenGL text rendering
[GL helper functions and classes.]

Collaboration diagram for OpenGL text rendering:

Enumerations
enum	CVD::TEXT_STYLE { CVD::FILL = 0, CVD::OUTLINE = 1, CVD::NICE = 2 }
	different style for font rendering More...
Functions
std::pair< double, double >	CVD::glDrawText (const std::string &text, enum TEXT_STYLE style=NICE, double spacing=1.5, double kerning=0.1)
std::pair< double, double >	CVD::glGetExtends (const std::string &text, double spacing=1.5, double kerning=0.1)
	returns the size of the bounding box of a text to be rendered, similar to glDrawText but without any visual output
const std::string &	CVD::glGetFont ()
	returns the name of the currently active font
void	CVD::glSetFont (const std::string &fontname)

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Enumeration Type Documentation

enum CVD::TEXT_STYLE

different style for font rendering

Enumerator:

FILL	renders glyphs as filled polygons
OUTLINE	renders glyphs as outlines with GL_LINES
NICE	renders glyphs filled with antialiased outlines

Definition at line 593 of file gl_helpers.h.

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Function Documentation

std::pair<double, double> CVD::glDrawText	(	const std::string &	text,
		enum TEXT_STYLE	style = NICE,
		double	spacing = 1.5,
		double	kerning = 0.1
	)

renders a string in GL using the current settings. Font coordinates are +X along the line and +Y along the up direction of glyphs. The origin is at the top baseline at the left of the first character. Characters have a maximum size of 1. linefeed is interpreted as a new line and the start is offset in -Y direction by spacing . Individual characters are separated by kerning + plus their individual with.

Parameters:

	text	string to be rendered, unknown characters are replaced with '?'
	style	rendering style
	spacing	distance between individual text lines
	kerning	distance between characters

std::pair<double, double> CVD::glGetExtends	(	const std::string &	text,
		double	spacing = 1.5,
		double	kerning = 0.1
	)

returns the size of the bounding box of a text to be rendered, similar to glDrawText but without any visual output

const std::string& CVD::glGetFont

(

)

returns the name of the currently active font

void CVD::glSetFont

(

const std::string &

fontname

)

sets the font to use for future font rendering commands. currently sans, serif and mono are available.

Parameters:

fontname

string containing font name