pdftron::PDF::PatternColor Class Reference

#include <PatternColor.h>

Public Types
enum	Type { e_uncolored_tiling_pattern, e_colored_tiling_pattern, e_shading, e_null }
enum	TilingType { e_constant_spacing, e_no_distortion, e_constant_spacing_fast_fill }

Public Member Functions
	PatternColor (SDF::Obj pattern)
	PatternColor (const PatternColor &)
PatternColor &	operator= (const PatternColor &)
	~PatternColor ()
Type	GetType () const
SDF::Obj	GetSDFObj ()
Common::Matrix2D	GetMatrix ()
Shading	GetShading ()
TilingType	GetTilingType () const
Rect	GetBBox ()
double	GetXStep ()
double	GetYStep ()
void	Destroy ()

Detailed Description

Patterns are quite general, and have many uses; for example, they can be used to create various graphical textures, such as weaves, brick walls, sunbursts, and similar geometrical and chromatic effects.

Patterns are specified in a special family of color spaces named Pattern, whose 'color values' are PatternColor objects instead of the numeric component values used with other spaces. Therefore PatternColor is to pattern color space what is ColorPt to all other color spaces.

A tiling pattern consists of a small graphical figure called a pattern cell. Painting with the pattern replicates the cell at fixed horizontal and vertical intervals to fill an area. The effect is as if the figure were painted on the surface of a clear glass tile, identical copies of which were then laid down in an array covering the area and trimmed to its boundaries. This is called tiling the area.

The pattern cell can include graphical elements such as filled areas, text, and sampled images. Its shape need not be rectangular, and the spacing of tiles can differ from the dimensions of the cell itself.

The order in which individual tiles (instances of the cell) are painted is unspecified and unpredictable; it is inadvisable for the figures on adjacent tiles to overlap.

Definition at line 42 of file PatternColor.h.

Member Enumeration Documentation

enum pdftron::PDF::PatternColor::TilingType

Enumerator
e_constant_spacing
e_no_distortion
e_constant_spacing_fast_fill

Definition at line 100 of file PatternColor.h.

enum pdftron::PDF::PatternColor::Type

Enumerator
e_uncolored_tiling_pattern
e_colored_tiling_pattern
e_shading
e_null

Definition at line 59 of file PatternColor.h.

Constructor & Destructor Documentation

pdftron::PDF::PatternColor::PatternColor

(

SDF::Obj

pattern

)

Create a PatternColor from the given SDF/Cos object listed under Pattern entry in page Resource dictionary

pdftron::PDF::PatternColor::PatternColor

(

const PatternColor &

)

pdftron::PDF::PatternColor::~PatternColor

(

)

Member Function Documentation

void pdftron::PDF::PatternColor::Destroy

(

)

Frees the native memory of the object.

Rect pdftron::PDF::PatternColor::GetBBox

(

)

Returns

A rectangle in the pattern coordinate system giving the coordinates of the left, bottom, right, and top edges, respectively, of the pattern cell's bounding box. These boundaries are used to clip the pattern cell.

Note

for patterns other than Tiling this method throws an exception.

Common::Matrix2D pdftron::PDF::PatternColor::GetMatrix

(

)

Returns

pattern matrix, a transformation matrix that maps the pattern's internal coordinate system to the default coordinate system of the pattern's parent content stream (the content stream in which the pattern is defined as a resource). The concatenation of the pattern matrix with that of the parent content stream establishes the pattern coordinate space, within which all graphics objects in the pattern are interpreted.

SDF::Obj pdftron::PDF::PatternColor::GetSDFObj

(

)

Returns

the underlying SDF/Cos object

Shading pdftron::PDF::PatternColor::GetShading

(

)

Returns

The shading object defining the shading pattern's gradient fill.

Note

for patterns other than Shading this method throws an exception.

TilingType pdftron::PDF::PatternColor::GetTilingType

(

)

const

Returns

the tiling type identifier that controls adjustments to the spacing of tiles relative to the device pixel grid:

Note

for patterns other than Tiling this method throws an exception.

Type pdftron::PDF::PatternColor::GetType

(

)

const

Returns

The pattern type

double pdftron::PDF::PatternColor::GetXStep

(

)

Returns

the desired horizontal spacing between pattern cells, measured in the pattern coordinate system.

Note

that XStep and YStep may differ from the dimensions of the pattern cell implied by the BBox entry. This allows tiling with irregularly shaped figures. XStep and YStep may be either positive or negative, but not zero.

for patterns other than Tiling this method throws an exception.

double pdftron::PDF::PatternColor::GetYStep

(

)

Returns

the desired vertical spacing between pattern cells, measured in the pattern coordinate system.

Note

for patterns other than Tiling this method throws an exception.

PatternColor& pdftron::PDF::PatternColor::operator=

(

const PatternColor &

)

---

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

• PDF/PatternColor.h