This function calculates the zoom and scroll values, so that the specified rectangle is fitted to ClipRect.
Declaration:
 Copy Code |
|
|---|---|
AT_ERRCOUNT ACCUAPI IG_dspl_zoom_to_rect(
[IN] HIGEAR hIGear,
[IN] DWORD dwGrpID,
[IN] HWND hWnd,
[IN] const LPAT_RECTANGLE lpZoomRect,
[OUT] LPDOUBLE lpdblHZoom,
[OUT] LPDOUBLE lpdblVZoom
);
|
|
Arguments:
| Name | Type | Description |
| hIGear | HIGEAR | ImageGear handle of image. |
| dwGrpID | DWORD | Identifier of group in which to set zoom_to_rect options. |
| hWnd | HWND | Handle of window where image is drawn. |
| lpZoomRect | const LPAT_RECTANGLE | Pointer to the rectangle in device coordinates that should be fitted into ClipRect. |
| lpdblHZoom | LPDOUBLE | Pointer to where to return the newly calculated ZoomValueH value. If NULL, then this parameter is ignored. |
| lpdblVZoom | LPDOUBLE | Pointer to where to return the newly calculated ZoomValueV value. If NULL, then this parameter is ignored. |
Return Value:
Returns the number of ImageGear errors that occurred during this function call.
Supported Raster Image Formats:
All pixel formats supported by ImageGear Professional.
Sample:
Display
Example:
| Copy Code |
|
|---|---|
HIGEAR hIGear; /* HIGEAR handle of image */ DWORD nGrpID; /* display group identifier */ AT_RECTANGLE ZoomRect; /* rectangle where to zoom */ RECT rc; ... GetClientRect( hWnd, &rc ); ZoomRect.x = rc.left; ZoomRect.y = rc.top; ZoomRect.width = (rc.right - rc.left + 1)/2; ZoomRect.height = (rc.bottom - rc.top + 1)/2; IG_dspl_zoom_to_rect( hIGear, nGrpID, hWnd, &ZoomRect, NULL, NULL ); ... |
|
Remarks:
It assigns ZoomMode=IG_DSPL_ZOOM_H_FIXED| IG_DSPL_ZOOM_V_FIXED, calculates and modifies ZoomValueH, ZoomValueV, and the horizontal and vertical scroll positions. It does not change the value of rectangles DeviceRect, ImageRect and ClipRect.