This function calculates the zoom and scroll values, so that the specified rectangle is fitted to ClipRect.
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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
);
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Name | Type | Description |
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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. |
Returns the number of ImageGear errors that occurred during this function call.
All pixel formats supported by ImageGear for C and C++.
Display
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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 ); ... |
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.