IG_dspl_device_to

This function translates an array of points from device coordinates to image coordinates.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_dspl_device_to_image( [IN] HIGEAR hIGear, [IN] DWORD dwGrpID, [IN] HWND hWnd, [IN] HDC hDC, [IN/OUT] LPAT_POINT lpPoint, [IN] UINT nCount );

Arguments:

Name	Type	Description
hIGear	HIGEAR	ImageGear handle of image.
dwGrpID	DWORD	Identifier of the group from which to get the display options.
hWnd	HWND	Handle of the window where the image is drawn.
hDC	HDC	Handle of the device context used for drawing. This can be NULL, but if a calculation is necessary for a printer device context, then you should provide the real value.
lpPoint	LPAT_POINT	Pointer to an array of points that should be translated.
nCount	UINT	Number of elements in the lpPoint array.

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++.

Example:

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HIGEAR hIGear; /* HIGEAR handle of image / DWORD nGrpID; / display group identifier / AT_POINT p[2]; / array of point to translate / RECT rc; ... / calculate coordinates in image coordinate space of current client rectangle of the window */ GetClientRect( hWnd, &rc ); p[0].x = rc.left; p[0].y = rc.top; p[1].x = rc.right; p[1].y = rc.bottom; IG_dspl_device_to_image( hIGear, nGrpID, hWnd, NULL, p, 2 ); ...

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HIGEAR hIGear;     /* HIGEAR handle of image  */ 
DWORD           nGrpID;     /* display group identifier  */
AT_POINT p[2];       /* array of point to translate  */
RECT            rc;
 ...
/* calculate coordinates in image coordinate space of current client rectangle of the
window */   
GetClientRect( hWnd, &rc );
p[0].x = rc.left;
p[0].y = rc.top;
p[1].x = rc.right;
p[1].y = rc.bottom;
IG_dspl_device_to_image( hIGear, nGrpID, hWnd, NULL, p, 2 );
 ...

Remarks:

This function takes into account all display parameters including orientation and current scrolling position.