NAME

mapw2 − maps a point on the screen into two-dimensional world coordinates

SPECIFICATION

C
mapw2(vobj, sx, sy, wx, wy)
Object vobj;
Screencord sx, sy;
Coord *wx, *wy;

FORTRAN
subroutine mapw2(vobj, sx, sy, wx, wy)
integer*4 vobj, sx, sy
real wx, wy

Pascal
procedure mapw2(vobj: Object; sx, sy: longint;
var wx, wy: Coord);

DESCRIPTION

mapw2 is the two-dimensional version of mapw.  vobj is a viewing object containing the viewport, projection, viewing, and modeling transformations that define world space. sx and sy define a screen space point.  wx and wy return the corresponding world space coordinates.  If the transformation is not two-dimensional, the result is undefined. 

SEE ALSO

mapw

NOTE

This routine is available only in immediate mode. 

Version 2.5  —  April 22, 1987