GEANT -- H2GEANTDRAW400

Other routines of the Drawing package

+-------------+ +----------## | Geant 3.15 | GEANT User's Guide | DRAW400 ## +-------------+ +----------##

Author(s) : F.Carminati Submitted: 15.08.83 Origin : P.Zanarini, S.Giani Revised: 09.11.92

Several drawing options can be set via the routine GDOPT (corresponding to the DOPT interactive command).

              +--------------------------------------------+
              | CALL GDOPT (CHOPT,CHVAL) |
              +--------------------------------------------+

Sets drawing options.

CHOPT: (CHARACTER*4) option to be set;
CHVAL: (CHARACTER*4) value to be assigned to the option.

The possible value of CHOPT and the corresponding values of CHVAL are the following:

PROJ

selects the type of projection, it can have the following values:

PARA: orthographic parallel projection (the default);
PERS: perspective projection.

THRZ

acronym for Tracks and Hits in a Radius versus Z projection, where R is the vertical axis and Z the horizontal one. This special projection, if activated, is used by the drawing system for tracks and hits only in the following cases:

X-Z cut: (CUTTHE=90 and CUTPHI=90 in GDRAWX or icut=2 in GDRAWC);
Y-Z cut: (CUTTHE=90 and CUTPHI=180 in GDRAWX or icut=1 in GDRAWC).

The option can have the following values:

360: for a rotation around 360 degrees, so all the projected points will have R positive;
180 or ON: for a rotation around 180 degrees, so the points will have R positive or negative depending on the sign of their Y coordinate in the Projection Reference System;
OFF: (the default) for not activating the R-Z projection and having the standard X-Z or Y-Z projections.

Note: When the THRZ option is set to ON or 180, an effect of particle reflection will be noticed for particles originating in one half space and going to the other half: when crossing the horizontal axis they will be reflected back into the original half space. If this way of drawing should cause problems for the user, the option 360 can be chosen, by which all the tracks (and hits) are on the top (positive) half space.

TRAK

selects the way tracks are drawn. Possible values:

LINE: (the default) the lines joining track points are drawn by GDXYZ;
POIN: only the track points are drawn.

HIDE

selects the hidden line removal technique for the drawings. Possible values are:

OFF: (the default) hidden lines are not removed from the drawing. The drawing is usually rather fast, but the resulting drawing can be quite messy if many volumes are visible;
ON: hidden lines are not drawn. If this value is selected, the detector can be exploded (interactive command BOMB), cut with different shapes (interactive command menu CVOL), and some parts can be shifted from their original position (interactive command SHIFT). Drawing with hidden line removal can be demanding in terms of CPU time and memory. At the end of each drawing the program displays the memory used and the statistics on the volume visibility. When the drawing requires more memory than available, the program will evaluate and display the number of missing words, so that the user can increase accordingly the size of the ZEBRA store in the common /GCBANK/.

SHAD

when HIDE is ON, selects the shading and filling option for the detector's surfaces that are drawn.

OFF

(the default) no shading of the surfaces will be performed;

ON

the volume surfaces will be filled according to the value of their FILL and LWID attribute, set via GSATT:

FILL=1: the surfaces are filled with the current colour assigned to the volume via GSATT. 166 different colours are available.
FILL>1: the surfaces are filled with a shade of the basic colour assigned to the volume according to their angle with respect to the line of illumination (which coincides with the line of view). The resolution increases with the value of FILL (1< FILL <=8).
LWID>0: just as the number of scan-lines used to fill a surface depends on the value of FILL, their width depends on the value of LWID. Increasing the value of LWID will result in thicker lines.

EDGE

gives the possibility not to draw the edges, so that they will be visible only as intersections of filled faces with different luminosity. For the volumes which are not filled, the normal edges will be drawn irrespective of the value of this option.

        +--------------------------------------------------------+
        | CALL GDZOOM (ZFU,ZFV,UZ0,VZ0,U0,V0) |
        +--------------------------------------------------------+

This routine sets the zoom parameters (part of the viewing parameters in /GCDRAW/) that define how the various objects (detector, tracks, hits, etc.) will be displayed by the subsequent drawing operations. The zoom is computed around UZ0, VZ0 (user coordinates). This point will be moved to U0, V0 in the resulting picture. ZFU, ZFV are the zoom factors (positive). If ZFU or ZFV are zero, the zoom parameters are reset, and the original viewing is restored.

ZFU: (REAL) zoom factor for U coordinate;
ZFV: (REAL) zoom factor for V coordinate;
UZ0: (REAL) U coordinate of centre of zoom;
VZ0: (REAL) V coordinate of centre of zoom;
U0: (REAL) U coordinate of centre of zoom in the resulting picture;
V0: (REAL) V coordinate of centre of zoom in the resulting picture.

            +------------------------------------------------+
            |CALL GDAXIS (X0,Y0,Z0,AXSIZ) |
            +------------------------------------------------+

Draws the axes of the MAster Reference System, corresponding to the current viewing parameters. All the arguments are in MARS units.

X0: (REAL) X coordinate of origin;
Y0: (REAL) Y coordinate of origin;
Z0: (REAL) Z coordinate of origin;
AXSIZ: (REAL) axis size in centimeters.

                +----------------------------------------+
                | CALL GDSCAL (U0,V0) |
                +----------------------------------------+

Draws a scale corresponding to the current viewing parameters. Seven kinds of units are available, from 1 micron to 100 cm. The best unit is automatically selected.

U0: (REAL) U coordinate of the centre of the scale;
V0: (REAL) V coordinate of the centre of the scale.

+-------------------------------------------------------------------------+
|CALL GDMAN (U0,V0)                  CALL GWOMA1(U0,V0) |
+-------------------------------------------------------------------------+

+---------------------------------------------------------------------------+
|CALL GDWMN2 (U0,V0)                  CALL GDWMN3(U0,V0) |
+---------------------------------------------------------------------------+

Draws the profile of a man, or three different female figures in 2D user coordinates, with the current scale factors. The figure is approximately 160 cm high.

U0: (REAL) U coordinate of the centre of the figure;
V0: (REAL) V coordinate of the centre of the figure.

  +--------------------------------------------------------------------+
  | CALL GDRAWT (U,V,CHTEXT,SIZE,ANGLE,LWIDTH,IOPT) |
  +--------------------------------------------------------------------+

Draws text with software characters. It has the same arguments of the HPLOT [bib-HPLOT] routine HPLSOF (a call to HPLSOF is actually performed).

U

(REAL) U position of text string;

V

(REAL) V position of text string;

CHTEXT

(CHARACTER*(*)) text string, optionally terminated by a dollar sign;

SIZE

(REAL) character size (cm);

ANGLE

(REAL) rotation angle (degrees);

LWIRTH

(INTEGER) line width (1,2,3,4,5);

IOPT

(INTEGER) centering option for the text:

-1: left adjusted;
0: centered;
1: right adjusted.

                +----------------------------------------+
                |CALL GDRAWV (U,V,NP) |
                +----------------------------------------+

Draws 2D polylines in user coordinates. The routine GDFR3D can be called to transform 3D points in 2D user coordinates.

U: (REAL) array of U coordinates;
DT: (REAL) array of V coordinates;
NP: (INTEGER) number of points.

          +----------------------------------------------------+
          |CALL GDHEAD (ISEL,CHNAME,CHRSIZ) |
          +----------------------------------------------------+

Draws a frame header. Different options can be chosen by the argument ISEL.

ISEL

(INTEGER) option to be selected for the title name (decimal integer):

0: to have only the header lines;
xxxxx1: to add the text CHNAME centered on top of header;
xxxx1x: to add global detector name (first volume) on left;
xxx1xx: to add date on right;
xx1xxx: to select thick characters for text in top of head (i.e. with larger line width);
x1xxxx: to add the text EVENT NR x on top of header;
1xxxxx: to add the text RUN NR x on top of header.

Note: ISEL=x1xxx1 or ISEL=1xxxx1 are illegal choices, i.e. they generate overwritten text.

CHNAME

(CHARACTER*4) title string, optionally terminated by a dollar sign;

CHRSIZ

(REAL) character size (cm) of text CHNAME.

                  +------------------------------------+
                  |CALL GDCOL (ICOL) |
                  +------------------------------------+

Sets the colour code.

ICOL

colour code (1,2,...,8), it can be positive, negative, or zero.

<0: to set the colour permanently;
<0: to set the colour temporarily;
=0: to restore the permanent colour value.

For example we can set ICOL=-1 to start with colour 1, then change to ICOL=3 to set colour 3, and at the end restore the original colour by setting ICOL=0 that takes colour 1 again.

                    +--------------------------------+
                    |CALL GDLW (LW) |
                    +--------------------------------+

Sets the line width.

LW

Line width code (1,2,...,5), it can be positive, negative, or zero.

<0: to set the line width permanently;
>0: to set the line width temporarily;
=0: to restore the permanent line width value.

For example we can set LW=-1 to start with line width 1, then change to LW=3 to set line width 3, and at the end restore the original line width by setting LW=0 that takes line width 1 again.

            +------------------------------------------------+
            |CALL GDCURS (U0*,V0*,ICHAR*) |
            +------------------------------------------------+

A graphics input is provided by this routine to fetch the 2D user coordinates of the graphics cursor on the screen, allowing an immediate user interface with the interactive version of GEANT. Interactive commands to zoom, measure, or pick tracks or hits make use of this routine. When the routine is called in the interactive version of GEANT, it draws on the screen the present position of the graphics cursor, which can be moved with the mouse. The user then positions the cursor and presses the left button. The routine returns then in U0, V0 the user coordinates of the graphics cursor. On terminals which do not have the mouse, the graphic cursor is moved with the arrows, and the point is acquired when any key, except carriage return is pressed. In this case the routine returns in ICHAR the ASCII value of the key pressed. If the user types the carriage return, the previous value is retained.

U0: (REAL) U coordinate of the graphics cursor;
V0: (REAL) V coordinate of the graphics cursor;
ICHAR: (INTEGER) ASCII value of the key pressed.

            +------------------------------------------------+
            |CALL GDFR3D (X,NPOINT,U*,V*) |
            +------------------------------------------------+

Converts from 3D space coordinates (either in MAster or Daughter Reference System) to the corresponding 2D user coordinates.

X

(REAL) array X(3,NPOINT) of space points;

NPOINT

(INTEGER) number of points:

>0: X is in the current DRS;
<0: X is in MARS;

U

(REAL) array of NPOINT U coordinates;

V

(REAL) array of NPOINT V coordinates.

This routine maps a space point (X, Y, Z in a right-handed reference system) onto a plane perpendicular to the observer's line of sight, defined by the spherical angles theta, phi:

theta: the angle between the line of sight and the Z axis (0<=theta< =180);
phi: the angle between the X axis and the projection onto the X-Y plane of the line of sight (0<=phi< =360).

The plane onto which the point is mapped is actually the X-Y plane of the Projection Reference System, and the observer's line of sight is the Z axis of PRS. The vertical axis on this plane (Y axis on PRS) is obtained by intersecting this plane with the one of MARS or DRS containing the line of sight and the Y axis.

           +--------------------------------------------------+
           |CALL GD3D3D (XIN,NPOINT,XOUT*) |
           +--------------------------------------------------+

Converts from 3D space coordinates in MARS to 3D coordinates in Projection Reference System (whose Z axis is along the line of sight given by theta and phi angles).

XIN: (REAL) array XIN(3,NPOINT) of input points in MARS;
NPOINT: (INTEGER) number of points;
XOUT: (REAL) array XOUT(3,NPOINT) of output points in PRS.