This function calculates DisplayedImageRect, which is the exact rectangle in which the image is to be scaled.
Declaration:
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AT_ERRCOUNT ACCUAPI IG_dspl_image_calc(
[IN] HIGEAR hIGear,
[IN] DWORD dwGrpID,
[IN] HWND hWnd,
[IN] HDC hDC,
[OUT] LPAT_RECTANGLE lpActualDeviceRect
);
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Arguments:
| Name | Type | Description |
| hIGear | HIGEAR | ImageGear handle from which to get options and pixel data. |
| dwGrpID | DWORD | Identifier of group from which to get display options. |
| hWnd | HWND | Handle of window where image is to be displayed. Can be NULL, but in this case some display options may be calculated incorrectly if they are not set explicitly. |
| hDC | HDC | Handle of the device context where image is to be drawn. |
| lpActualDeviceRect | LPAT_RECTANGLE | Pointer to the rectangle in which to copy DisplayedImageRect. This rectangle is calculated no matter whether hDC=NULL or not. 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:
None
Example:
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HIGEAR hIGear; /* HIGEAR handle of image */ DWORD nGrpID; /* Display group identifier */ AT_RECTANGLE DisplayedRect; ... case WM_PAINT: BeginPaint(hWnd, &ps); if (IG_image_is_valid(hIGear)) IG_dspl_image_calc( hIGear, nGrpID, hWnd, ps.hdc, &DisplayedRect ); EndPaint(hWnd, &ps); break; |
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Remarks:
All options for drawing the image are taken from the dwGrpID group. This function does not perform any drawing, whether hDC is NULL or not.