mapw2(3G)							     mapw2(3G)

NAME    [Toc]    [Back]

     mapw2 - maps a point on the screen	into 2-D world coordinates

C SPECIFICATION    [Toc]    [Back]

     void mapw2(Object vobj, Screencoord sx, Screencoord sy,
		Coord *wx, Coord *wy)

PARAMETERS    [Toc]    [Back]

     vobj   expects the	transformations	that map the displayed objects to
	    world coordinates.

     sx	    expects the	x coordinate of	the screen point to be mapped.

     sy	    expects the	y coordinate of	the screen point to be mapped.

     wx	    returns the	corresponding x	world coordinate.

     wy	    returns the	corresponding y	world coordinate.

DESCRIPTION    [Toc]    [Back]

     mapw2 is the 2-D version of mapw.	vobj is	a viewing object that defines
     world space.  It contains only routines that affect the model-view
     matrix, the projection matrix, or the viewport specification.  sx and sy
     define a point in screen coordinates.  wx and wy return the corresponding
     world coordinates.	 If the	transformation is not 2-D, the result is
     undefined.

SEE ALSO    [Toc]    [Back]

     mapw

NOTE    [Toc]    [Back]

     This routine is available only in immediate mode.


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