GlsText::UnderlineStrikeThruRenderer Class Reference

#include <gls_text.h>

Classes
struct	LineSegment

Public Member Functions
	UnderlineStrikeThruRenderer (const GlsUInt32 numLineSegments, const GlsFloat32 cellWidth, const GlsFloat32 cellHeight, const GlsBool shadow, const GlsFloat32 shadowDistance, const GlsColor &shadowColor, const GlsFloat32 underlineOffset, const GlsFloat32 underlineSize)
void	SetShadowColor (const GlsColor &shadowColor)
void	Reset (void)
void	PreProcessCharacter (const GlsText::CharAttribute &charAttribute, const GlsFloat32 cellX, const GlsFloat32 charY)
void	PostProcessCharacter (const GlsText::CharAttribute &charAttribute, const GlsFloat32 cellX, const GlsFloat32 charY, const GlsBool endOfLine)
void	RenderLineSegments (GlsStateManager &gl) const
GlsBool	IsUpToDate (void) const

Protected Member Functions
void	DrawScalableLine (GlsStateManager &gl, const GlsFloat32 x1, const GlsFloat32 y1, const GlsFloat32 x2, const GlsFloat32 y2) const
	~UnderlineStrikeThruRenderer ()

Protected Attributes
const GlsFloat32	_cellWidth
const GlsFloat32	_cellHeight
const GlsBool	_shadow
const GlsFloat32	_shadowDistance
GlsColor	_shadowColor
const GlsFloat32	_underlineOffset
const GlsFloat32	_underlineSize
GlsFloat32	_underlineX1
GlsFloat32	_underlineX2
GlsFloat32	_underlineY
GlsFloat32	_underlineScale
GlsColor	_underlineColor
GlsBool	_underlineOn
GlsFloat32	_strikeX1
GlsFloat32	_strikeX2
GlsFloat32	_strikeY
GlsFloat32	_strikeScale
GlsColor	_strikeColor
GlsBool	_strikeOn
const GlsUInt32	_maxNumLineSegments
GlsUInt32	_numLineSegments
LineSegment *const	_lineSegments
GlsBool	_isUpToDate

Detailed Description

Helper class for processing underline and strike-thru when drawing text

Invariant

GlsFloatIsValid( _cellWidth ), GlsFloatIsValid( _cellHeight ), GlsFloatIsValid( _shadowDistance ), _shadowColor.IsValid(), GlsFloatIsValid( _underlineOffset ), GlsFloatIsValid( _underlineSize ), GlsFloatIsValid( _underlineX1 ), GlsFloatIsValid( _underlineX2 ), GlsFloatIsValid( _underlineY ), GlsFloatIsValid( _underlineScale ), _underlineColor.IsValid(), GlsFloatIsValid( _strikeX1 ), GlsFloatIsValid( _strikeX2 ), GlsFloatIsValid( _strikeY ), GlsFloatIsValid( _strikeScale ), _strikeColor.IsValid(), _maxNumLineSegments > 0u, _numLineSegments <= _maxNumLineSegments, GLS_NULL != _lineSegments, each element in the _lineSegments array is valid

Constructor & Destructor Documentation

GlsText::UnderlineStrikeThruRenderer::UnderlineStrikeThruRenderer	(	const GlsUInt32	numLineSegments,
		const GlsFloat32	cellWidth,
		const GlsFloat32	cellHeight,
		const GlsBool	shadow,
		const GlsFloat32	shadowDistance,
		const GlsColor &	shadowColor,
		const GlsFloat32	underlineOffset,
		const GlsFloat32	underlineSize
	)

Constructor - create an instance

Parameters

numLineSegments	number of line segments supported by renderer (>0)
cellWidth	width of a character cell
cellHeight	height of a character cell
shadow	GLS_TRUE if text has shadow enabled else GLS_FALSE
shadowDistance	distance for shadow
shadowColor	color of shadow
underlineOffset	offset of underline
underlineSize	size of underline

Precondition

numLineSegments > 0, GlsFloatIsValid() for all floating point arguments, shadowColor.IsValid()

Postcondition

instance created

GlsText::UnderlineStrikeThruRenderer::~UnderlineStrikeThruRenderer ( )

protected

Destructor - shall never be called

Precondition

none

Postcondition

none

Member Function Documentation

void GlsText::UnderlineStrikeThruRenderer::DrawScalableLine ( GlsStateManager &  gl, const GlsFloat32  x1, const GlsFloat32  y1, const GlsFloat32  x2, const GlsFloat32  y2  ) const

protected

Draw a line by rendering a filled polygon with a line around it so that the thickness of the line can be varied and antialiasing occurs if enabled

Parameters

gl	GL state manager to draw into
x1	x coord of first corner of the line poly
y1	y coord of first corner of the line poly
x2	x coord of opposite corner of the line poly
y2	y coord of opposite corner of the line poly

Precondition

GlsFloatIsValid( x1 ), GlsFloatIsValid( y1 ), GlsFloatIsValid( x2 ), GlsFloatIsValid( y2 )

Postcondition

line is drawn to OpenGL

GlsBool GlsText::UnderlineStrikeThruRenderer::IsUpToDate

(

void

)

const

Determine if the line segments in the renderer are up to date

Precondition

none

Postcondition

none

Returns

GLS_TRUE if the line segments are up to date, GLS_FALSE if the line segments need to be recomputed

void GlsText::UnderlineStrikeThruRenderer::PostProcessCharacter	(	const GlsText::CharAttribute &	charAttribute,
		const GlsFloat32	cellX,
		const GlsFloat32	charY,
		const GlsBool	endOfLine
	)

Post Process the given character attributes

Parameters

charAttribute	character attribute in question
cellX	x coord of character cell one past the given character
charY	y coord of character
endOfLine	GLS_TRUE if character is the end of the current line else GLS_FALSE

Precondition

charAttribute.IsValid(), GlsFloatIsValid( cellX ), GlsFloatIsValid( charY ), IsUpToDate() == GLS_FALSE

Postcondition

given character attribute is postprocessed for underline / strikethru processing, if endOfLine then IsUpToDate() == GLS_TRUE

void GlsText::UnderlineStrikeThruRenderer::PreProcessCharacter	(	const GlsText::CharAttribute &	charAttribute,
		const GlsFloat32	cellX,
		const GlsFloat32	charY
	)

Pre Process the given character attribute

Parameters

charAttribute	character attribute in question
cellX	x coord of character
charY	y coord of character

Precondition

charAttribute.IsValid(), GlsFloatIsValid( cellX ), GlsFloatIsValid( charY ), IsUpToDate() == GLS_FALSE

Postcondition

given character attribute is preprocessed for underline / strikethru processing

void GlsText::UnderlineStrikeThruRenderer::RenderLineSegments

(

GlsStateManager &

gl

)

const

Render the line segments for the underline / strikethru

Parameters

gl	OpenGL state manager to render into

Precondition

none

Postcondition

line segments are rendered to GL

void GlsText::UnderlineStrikeThruRenderer::Reset

(

void

)

Invalidate all line segments in the renderer

Precondition

none

Postcondition

all line segments are invalidated, IsUpToDate() == GLS_FALSE

void GlsText::UnderlineStrikeThruRenderer::SetShadowColor

(

const GlsColor &

shadowColor

)

Set the shadow color associated with the renderer

Parameters

shadowColor

new shadow color

Precondition

shadowColor.IsValid()

Postcondition

renderer has new shadow color

Member Data Documentation

const GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_cellHeight

protected

height of one character cell

const GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_cellWidth

protected

width of one character cell

GlsBool GlsText::UnderlineStrikeThruRenderer::_isUpToDate

protected

GLS_TRUE if _lineSegments is up to date, else GLS_FALSE if the line segments need to be recomputed

LineSegment* const GlsText::UnderlineStrikeThruRenderer::_lineSegments

protected

array of line segments to render ( _maxNumLineSegments number of elements )

const GlsUInt32 GlsText::UnderlineStrikeThruRenderer::_maxNumLineSegments

protected

maximum number of line segments the renderer can hold

GlsUInt32 GlsText::UnderlineStrikeThruRenderer::_numLineSegments

protected

current number of line segments in the _lineSegments array ( <= _maxNumLineSegments )

const GlsBool GlsText::UnderlineStrikeThruRenderer::_shadow

protected

GLS_TRUE if shadowing is enabled else GLS_FALSE

GlsColor GlsText::UnderlineStrikeThruRenderer::_shadowColor

protected

color of shadow

const GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_shadowDistance

protected

distance of shadow line segment from primary line segment

GlsColor GlsText::UnderlineStrikeThruRenderer::_strikeColor

protected

color of next strikethru line segment

GlsBool GlsText::UnderlineStrikeThruRenderer::_strikeOn

protected

GLS_TRUE if strikethru is currently on when processing characters

GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_strikeScale

protected

character scaling applied to the next strikethru line segment

GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_strikeX1

protected

starting x coord for next strikethru line segment

GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_strikeX2

protected

ending x x coord for next strikethru line segment

GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_strikeY

protected

y coord for next strikethru line segment

GlsColor GlsText::UnderlineStrikeThruRenderer::_underlineColor

protected

color of next underline line segment

const GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_underlineOffset

protected

offset of underline line segment

GlsBool GlsText::UnderlineStrikeThruRenderer::_underlineOn

protected

GLS_TRUE if underlining is currently on when processing characters

GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_underlineScale

protected

character scaling applied to the next underline line segment

const GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_underlineSize

protected

size of underline segment

GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_underlineX1

protected

starting x coord for next underline line segment

GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_underlineX2

protected

ending x x coord for next underline line segment

GlsFloat32 GlsText::UnderlineStrikeThruRenderer::_underlineY

protected

y coord for next underline line segment