Modulef
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7.3 Particular displays

```
      SUBROUTINE CONTXT(IV, ITYP, PM, DIMX, DIMY, FLAG)
      REAL PM(2), DIMX, DIMY
      LOGICAL FLAG
      INTEGER IV, ITYP
```
defines the display context of the different views, where:

IV: defines the vertical axis w.r.t. the observer (1=OX, 2=OY, 3=OZ);
ITYP=0: coordinates in centimeters, ITYP=1: coordinates in percentages of the screen;
PM: coordinates of the center of the screen;
DIMX, DIMY: screen dimensions;
IFLAG = .TRUE.: generate the window.

The subroutines which follow are used to obtain different views of an object in the 3D space. They are, however, not used very often: we can obtain these different views via other methods by positioning the observer carefully and/or by the indicators (CLIP, NOPERS, ...).

```
      SUBROUTINE AXONO(OBJET, PTREGA, ECHEL)
      REAL PTREGA(3), ECHEL
      EXTERNAL OBJET
```
presents an axonometric view of subroutine OBJET describing an object, where:
PTREGA(1:3): coordinates of the point viewed;
ECHEL: the scaling factor to change from the object's dimensions to the window's dimensions, in centimeters.
```
      SUBROUTINE CAVAL(OBJET, PTREGA, ECHEL)
      REAL PTREGA(3), ECHEL
      EXTERNAL OBJET
```
presents a cavalier view of subroutine OBJET describing an object, where:
PTREGA(1:3): coordinates of the point viewed;
ECHEL: the scaling factor to change from the object's dimensions to the window's dimensions, in centimeters.
```
      SUBROUTINE DESSU(OBJET, PTREGA, ECHEL)
      REAL PTREGA(3), ECHEL
      EXTERNAL OBJET
```
presents a bottom view of subroutine OBJET describing an object, where:
PTREGA(1:3): coordinates of the point viewed;
ECHEL: the scaling factor to change from the object's dimensions to the window's dimensions, in centimeters.
```
      SUBROUTINE DROITE(OBJET, PTREGA, ECHEL)
      REAL PTREGA(3), ECHEL
      EXTERNAL OBJET
```
presents a right view of subroutine OBJET describing an object, where:
PTREGA(1:3): coordinates of the point viewed;
ECHEL: the scaling factor to change from the object's dimensions to the window's dimensions, in centimeters.
```
      SUBROUTINE FACE(OBJET, PTREGA, ECHEL)
      REAL PTREGA(3), ECHEL
      EXTERNAL OBJET
```
presents a front view of subroutine OBJET describing an object, where:
PTREGA(1:3): coordinates of the point viewed;
ECHEL: the scaling factor to change from the object's dimensions to the window's dimensions, in centimeters.
```
      SUBROUTINE PERSP(OBJET, OBS, PTREGA, ALPHA, FLAG, DMIN, DMAX)
      REAL OBS(3), PTREGA(3), ALPHA, DMIN, DMAX
      LOGICAL FLAG 
      EXTERNAL OBJET
```
displays object OBJET in perspective, with context CONTXT, where:

PTREGA(1:3): coordinates of the point viewed;
OBS(1:3): coordinates of the observer;
ALPHA: vision half-angle in X;
DMIN,DMAX: see MASQU3;
FLAG: if .TRUE. use DMIN and DMAX;
ECHEL: the scaling factor to change from the object's dimensions to the window's dimensions, in centimeters.

Next: 7.4 Basic manipulations Up: 7 Internal programs Prev: 7.2 Position and clipping Contents