IG_dspl_mapmode

IG_dspl_mapmode_set

In This Topic

This function sets the current map mode and logical coordinate system.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_dspl_mapmode_set( [IN] HIGEAR hIGear, [IN] DWORD dwGrpID, [IN] DWORD dwMapMode, [IN] const LPAT_RECTANGLE lpViewport, [IN] const LPAT_RECTANGLE lpWindow );

Arguments:

Name	Type	Description
hIGear	HIGEAR	ImageGear handle of image.
dwGrpID	DWORD	Identifier of group in which to set map mode options.
dwMapMode	DWORD	New value of option MapMode to assign.
LpViewport	const LPAT_RECTANGLE	New value of Viewport option to assign.
LpWindow	const LPAT_RECTANGLE	New value of Window option to assign.

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, MFC, MFC Threads

Example:

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HIGEAR hIGear; /* HIGEAR handle of image / DWORD nGrpID; / display group identifier / DWORD dwMapMode; / map mode / AT_RECTANGLE Viewport; / view port values / AT_RECTANGLE Window; / window values / POINT p; SIZE s; ... / get current mapping parameters */ dwMapMode = GetMapMode( hDC ); GetViewportOrgEx( hDC, &p ); Viewport.x = p.x; Viewport.y = p.y; GetViewportExtEx( hDC, &s ); Viewport.width = s.cx; Viewport.height = s.cy; GetWindowOrgEx( hDC, &p ); Window.x = p.x; Window.y = p.y; GetWindowExtEx( hDC, &s ); Window.width = s.cx; Window.height = s.cy; IG_dspl_mapmode_set( hIGear, nGrpID, dwMapMode, &Viewport, &Window ); ...

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HIGEAR           hIGear;     /* HIGEAR handle of image  */ 
DWORD           nGrpID;      /* display group identifier  */
DWORD           dwMapMode;       /* map mode   */
AT_RECTANGLE            Viewport;         /* view port values  */
AT_RECTANGLE             Window;          /* window values  */
POINT           p;
SIZE            s;
 ...
/* get current mapping parameters */
dwMapMode = GetMapMode( hDC );
GetViewportOrgEx( hDC, &p );
Viewport.x = p.x;
Viewport.y = p.y;
GetViewportExtEx( hDC, &s );
Viewport.width = s.cx;
Viewport.height = s.cy;
GetWindowOrgEx( hDC, &p );
Window.x = p.x;
Window.y = p.y;
GetWindowExtEx( hDC, &s );
Window.width = s.cx;
Window.height = s.cy;
IG_dspl_mapmode_set( hIGear, nGrpID, dwMapMode, &Viewport, &Window );
 ...

Remarks:

ImageGear will perform all calculations with the assumption that the specified logical system is used for the device coordinates.

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