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Kapetan


Joined: 16 Jun 2006
Posts: 532

PostPosted: Sat Oct 14, 2006 11:45 pm    Post subject: Regions Reply with quote

CreateRectRgnIndirect - creates a rectangular region.

Code:
HRGN CreateRectRgnIndirect(
  CONST RECT *lprc   // rectangle
);

CombineRgn - combines two regions and stores the result in a third
region. The two regions are combined according to the specified mode.


Code:
int CombineRgn(
  HRGN hrgnDest,      // handle to destination region
  HRGN hrgnSrc1,      // handle to source region
  HRGN hrgnSrc2,      // handle to source region
  int  fnCombineMode  // region combining mode
);

The three regions need not be distinct. For example, the hrgnSrc1
parameter can equal the hrgnDest parameter.

* RGN_AND Creates the intersection of the two combined regions.
* RGN_COPY Creates a copy of the region identified by hrgnSrc1.
* RGN_DIFF Combines the parts of hrgnSrc1 that are not part of hrgnSrc2.
* RGN_OR Creates the union of two combined regions.
* RGN_XOR Creates the union of two combined regions except for any overlapping areas.


SelectClipRgn - selects a region as the current clipping region for
the specified device context.

Code:
int SelectClipRgn(
  HDC hdc,    // handle to DC
  HRGN hrgn   // handle to region
);

Only a copy of the selected region is used. The region itself can be
selected for any number of other device contexts or it can be deleted.
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delovski



Joined: 14 Jun 2006
Posts: 3524
Location: Zagreb

PostPosted: Sun Oct 15, 2006 10:13 pm    Post subject: Reply with quote

Folklore: I Still Remember Regions, by Andy Hertzfeld

"The single most significant component of the original Macintosh technology
was QuickDraw, the graphics package written by Bill Atkinson. Most importantly,
all of the QuickDraw drawing primitives clipped to the intersection of three
different regions, to allow drawing into obscured windows. We considered
QuickDraw's speed and deftness at region handling to be the most significant
"crown jewel" in Apple's entire arsenal."
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