an optional windows device context.Creating a Region
The LEADTOOLS LRasterPaint class provides the following functions for creating a region:
These functions require:
an optional windows device context.
the necessary data used to control the region creation.
a pointer to a region handle to be updated with the resulting region.
These functions will create regions based on the current region properties. To determine the current region properties, call LRasterPaint::GetProperty. To set or change the current region properties, call LRasterPaint::SetProperty. For more information on the region properties, refer to the PAINTREGION structure.
The resulting region can be scaled or translated with the LRasterPaint::RegionScale or LRasterPaint::RegionTranslate functions.
Before creating a region, set the DigitalPaint metrics using the LRasterPaint::SetMetrics function.
The following example creates a rectangular region using the current region properties and the current transformations. It assumes the Digitalpaint class object has been initialized and the window handle is valid:
/* Get the device context */
hDC = GetDC ( hWnd ) ;
/* Set the coordinates with respect to the DC dimensions*/
SetRect ( &rcRegion, 10, 10, 100, 100 ) ;
/* Use the current region properties and the current painting
transformations to create a rectangular region */
// Assume Paint was constructed from LRasterPaint class
Paint.RegionRect ( hDC, &rcRegion, &hRgn ) ;