Drawing Routines.

draw(x, y, z)

Draw from current graphics position to (x, y, z). (x, y, z) is a point in world coordinates.

```    Fortran:
subroutine draw(x, y, z)
real x, y, z

C:
draw(x, y, z)
float     x, y, z;

Pascal:
procedure Draw(x, y, z: real)
```

rdraw(deltax, deltay, deltaz)

Relative draw. deltax, deltay, and deltaz are offsets in world units.

```    Fortran:
subroutine rdraw(deltax, deltay, deltaz)
real deltax, deltay, deltaz

C:
rdraw(deltax, deltay, deltaz)
float   deltax, deltay, deltaz;

Pascal:
procedure Rdraw(deltax, deltay, deltaz: real)
```

draw2(x, y)

Draw from current graphics position to point (x, y). (x, y) is a point in world coordinates.

```    Fortran:
subroutine draw2(x, y)
real x, y

C:
draw2(x, y)
float     x, y;

Pascal:
procedure Draw2(x, y: real)
```

rdraw2(deltax,deltay)

Relative draw2. deltax and deltay are offsets in world units.

```    Fortran:
subroutine rdraw2(deltax, deltay)
real deltax, deltay

C:
rdraw2(deltax, deltay)
float   deltax, deltay;

Pascal:
procedure Rdraw2(deltax, deltay: real)
```

sdraw2(x, y)

Draw in screen coordinates (-1.0 to 1.0).

```    Fortran:
subroutine sdraw2(x, y)
real x, y

C:
sdraw2(x, y)
float     x, y;

Pascal:
procedure Sdraw2(x, y: real)
```

rsdraw2(deltax, deltay)

Relative sdraw2. delatx and deltay are in screen units (-1.0 to 1.0).

```    Fortran:
subroutine rsdraw2(deltax, deltay)
real deltax, deltay
C:
rsdraw2(deltax, deltay)
float     deltax, deltay;

Pascal:
procedure Rsdraw2(deltax, deltay: real)
```