Computes the inverse mapping from screen coordinates to 2-D modeling coordinates.
FORTRAN (libfgl.a)
void mapw2 (Int32 viewobj, Screencoord screenx, Screencoord screeny, Coord *modelx, Coord *modely)
SUBROUTINE MAPW2(viewobj, screenx, screeny, modelx, modely) INTEGER*4 viewobj, screenx, screeny REAL modelx, modely
Note: For FORTRAN users, this subroutine accepts long integer parameters (INTEGER*4) when invoked from a FORTRAN program, although it accepts short integers when invoked from a C program. The C and FORTRAN syntax shown here reflect this difference.
The mapw2 subroutine maps a point on the screen into 2-D modeling coordinates. This subroutine is the 2-D version of the mapw subroutine.
Note: This subroutine cannot be used to add to a display list.
| viewobj | Specifies a primitive containing the viewport, projection, viewing, and modeling transformations that define modeling space. |
| screenx | Specifies a point in screen coordinates. |
| screeny | Specifies a point in screen coordinates. |
| modelx | Specifies the corresponding x model coordinate. |
| modely | Specifies the corresponding y model coordinate. |
This subroutine is part of GL in the AIXwindows Environment/6000 Version 1, Release 2 with AIXwindows/3D Feature.
| /usr/include/gl/gl.h | Contains C language constant and variable type definitions for GL. |
| /usr/include/gl/fgl.h | Contains FORTRAN constant and variable type definitions for GL. |
Creating a new object in the display list with the makeobj subroutine.
Computing the inverse mapping from screen coordinates to 3-D modeling coordinates with the mapw subroutine.
AIX Graphics Library Overview, Picking and Selecting Overview, and Working with Coordinate Systems.