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csRectRegion Class Reference
[Geometry utilities]

A rect region is a class that implements splittable 2d rectangles. More...

#include <csgeom/csrectrg.h>

List of all members.

Public Member Functions

 csRectRegion ()
 Constructor.
 ~csRectRegion ()
 Destructor.
void Include (const csRect &rect)
 Add a rect to this region; may cause unions, but will not adjance (see csRect).
void Exclude (const csRect &rect)
 Exclude a rect from this region; may cause splitting.
void ClipTo (csRect &clip)
 Clips everything in the region to the borders given.
int Count () const
 Returns the number of rectangles in this region.
csRectRectAt (int i) const
 Returns the rect at a specific index.
void makeEmpty ()
 Resets the region count to zero.

Protected Member Functions

void pushRect (csRect const &)
 Pushes a new rect into the region, increases buffer if necessary.
void deleteRect (int)
 Removes a rect from the region.
void fragmentRect (csRect &, csRect &, int mode)
 Controls fragmentContainedRect, used to perform all-side clipping and edge intersection.
void fragmentContainedRect (csRect &r1, csRect &r2)
 Work method fragments rects properly when they intersect.
void markForGather ()
 Marks the current region insertion point for gather.
void gatherFragments ()
 Gathers all regions since the mark into the fragment buffer.

Protected Attributes

csRectregion
 The pointer the list of regions.
int region_count
 The number of regions currently stored.
int region_max
 The size of the region buffer (in rects).
csRect fragment [FRAGMENT_BUFFER_SIZE]
 The fragment buffer, used for performing fragment operations.
int gather_mark
 The gather marker.


Detailed Description

A rect region is a class that implements splittable 2d rectangles.

The region may be composed of one or more rectangles that do not need to occupy the same area. The idea being that you need to be able to have a number of disparate rectangular regions for updates. This class uses csRect for nearly all rectangle operations.

To use you can Include and Exclude rectangles from this region. When finished, this class will have a list of optimal rectangles that occupy a region. If used properly, it will result in faster overall painting performance, since several areas will not require overwriting.

Definition at line 56 of file csrectrg.h.


Constructor & Destructor Documentation

csRectRegion::csRectRegion  ) 
 

Constructor.

csRectRegion::~csRectRegion  ) 
 

Destructor.


Member Function Documentation

void csRectRegion::ClipTo csRect clip  ) 
 

Clips everything in the region to the borders given.

int csRectRegion::Count  )  const [inline]
 

Returns the number of rectangles in this region.

Definition at line 100 of file csrectrg.h.

void csRectRegion::deleteRect int   )  [protected]
 

Removes a rect from the region.

void csRectRegion::Exclude const csRect rect  ) 
 

Exclude a rect from this region; may cause splitting.

void csRectRegion::fragmentContainedRect csRect r1,
csRect r2
[protected]
 

Work method fragments rects properly when they intersect.

void csRectRegion::fragmentRect csRect ,
csRect ,
int  mode
[protected]
 

Controls fragmentContainedRect, used to perform all-side clipping and edge intersection.

void csRectRegion::gatherFragments  )  [protected]
 

Gathers all regions since the mark into the fragment buffer.

void csRectRegion::Include const csRect rect  ) 
 

Add a rect to this region; may cause unions, but will not adjance (see csRect).

void csRectRegion::makeEmpty  ) 
 

Resets the region count to zero.

void csRectRegion::markForGather  )  [protected]
 

Marks the current region insertion point for gather.

void csRectRegion::pushRect csRect const &   )  [protected]
 

Pushes a new rect into the region, increases buffer if necessary.

csRect& csRectRegion::RectAt int  i  )  const [inline]
 

Returns the rect at a specific index.

Definition at line 102 of file csrectrg.h.

References region.


Member Data Documentation

csRect csRectRegion::fragment[FRAGMENT_BUFFER_SIZE] [protected]
 

The fragment buffer, used for performing fragment operations.

Definition at line 66 of file csrectrg.h.

int csRectRegion::gather_mark [protected]
 

The gather marker.

Definition at line 68 of file csrectrg.h.

csRect* csRectRegion::region [protected]
 

The pointer the list of regions.

Definition at line 60 of file csrectrg.h.

Referenced by RectAt().

int csRectRegion::region_count [protected]
 

The number of regions currently stored.

Definition at line 62 of file csrectrg.h.

int csRectRegion::region_max [protected]
 

The size of the region buffer (in rects).

Definition at line 64 of file csrectrg.h.


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