GpiSetPickApertureSize
From EDM2
This function sets the pick-aperture size.
Syntax
#define INCL_GPICORRELATION /* Or use INCL_GPI, INCL_PM, */ #include <os2.h> HPS hps; /* Presentation-space handle. */ LONG lOptions; /* Setting option. */ PSIZEL psizlSize; /* Pick aperture size. */ BOOL rc; /* Success indicator. */ rc = GpiSetPickApertureSize(hps, lOptions, psizlSize);
Parameters
- hps (HPS) - input
- Presentation-space handle.
- lOptions (LONG) - input
- Setting option.
- PICKAP_DEFAULT : Use the default pick aperture. The value of psizlSize is ignored.
- PICKAP_REC : Use the values specified by psizlSize.
- psizlSize (PSIZEL) - input
- Pick aperture size.
Return Code
- rc (BOOL) - returns
- Success indicator.
- TRUE Successful completion
- FALSE Error occurred.
Errors
Possible returns from WinGetLastError
- PMERR_INV_HPS (0x207F)
- An invalid presentation-space handle was specified.
- PMERR_PS_BUSY (0x20F4)
- An attempt was made to access the presentation space from more than one thread simultaneously.
- PMERR_INV_PICK_APERTURE_OPTION (0x20B4)
- An invalid options parameter was specified with GpiSetPickApertureSize.
- PMERR_INV_PICK_APERTURE_SIZE (0x20B6)
- An invalid size parameter was specified with GpiSetPickApertureSize.
Remarks
The pick aperture can be set either to the default value, or to a specified size in presentation page space. This is used in any subsequent nonretained or retained correlation operations.
The default size is a rectangle in presentation page space that produces a square on the device, with side equal to the default character cell height.
Example Code
In this example we set the pick-aperture size to a 4 by 4 box in world coordinates.
#define INCL_GPICORRELATION #include <OS2.H> HPS hps; /* Presentation space handle. */ SIZEL sizel; /* Pick-aperture position. */ sizel.cx = 4L; sizel.cy = 4L; GpiSetQueryPickApertureSize(hps, &sizel);
