mapw2(3G) mapw2(3G)
NAME
mapw2 - maps a point on the screen into 2-D world coordinates
C SPECIFICATION
void mapw2(Object vobj, Screencoord sx, Screencoord sy,
Coord *wx, Coord *wy)
PARAMETERS
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
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
mapw
NOTE
This routine is available only in immediate mode.
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