IG_dspl_zoom_to

This function calculates the zoom and scroll values, so that the specified rectangle is fitted to ClipRect.

Declaration:

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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 );

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 for C and C++.

Sample:

Display

Example:

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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 ); ...

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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 );
 ...

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.