WinInvertRect
Posts a message to the message queue associated with the window defined by hwnd.
Syntax
WinInvertRect(hps, prclRect)
Parameters
- hps (HPS) - input
- Presentation-space handle.
- The presentation space contains the rectangle to be inverted.
- prclRect (PRECTL) - input
- Rectangle to be inverted.
- Note: The value of each field in this structure must be in the range -32 768 through 32 767. The data type WRECT can also be used, if supported by the language.
Returns
- rc (BOOL) - returns
- Success indicator.
- TRUE
- Successful completion
- FALSE
- Error occurred.
Remarks
Inversion is a logical-NOT operation and has the effect of flipping the bits of each pel.
Example Code
#define INCL_WINWINDOWMGR /* Or use INCL_WIN, INCL_PM, */ #include <os2.h> HPS hps; /* Presentation-space handle. */ PRECTL prclRect; /* Rectangle to be inverted. */ BOOL rc; /* Success indicator. */ rc = WinInvertRect(hps, prclRect);
This example inverts a rectangle if the mouse button is released (WM_BUTTON1UP) within the rectangle (WinPtInRect); the presentation space handle is obtained via WinBeginPaint.
#define INCL_WINWINDOWMGR /* Window Manager Functions */
#include <os2.h>
BOOL fSuccess; /* success indicator */
HAB hab; /* anchor-block handle */
RECTL prclRect1 = {0,0,100,100}; /* rectangle */
HWND hwnd; /* client window handle */
HPS hps; /* presentation-space handle */
POINTL ptl; /* current mouse position */
MPARAM mpParam1; /* Parameter 1 (x,y) point value */
case WM_BUTTON1UP:
ptl.x = (LONG) SHORT1FROMMP(mpParam1);
ptl.y = (LONG) SHORT2FROMMP(mpParam1);
if (WinPtInRect(hab, &prclRect1, &ptl))
{
hps = WinBeginPaint(hwnd, NULLHANDLE, &prclRect1);
fSuccess = WinInvertRect(hps, &prclRect1);
WinEndPaint(hps);
}