DMM Varkon® Tutorial
A Beginner's Guide to the Varkon Parametric Modeling and CAD Application Development System
By David M. MacMillan

### 12.4. Square 2D Grid

The following MBS drawing module plots a square two-dimensional grid. The lines of the grid are drawn by pens of width 0 (i.e., as thin as possible). A diagonal line is provided to emphasize the squareness of the grid. The grid's lines are numbered by their X and Y coordinates.

The calling syntax is:

grid2d (delta, n);

• delta is of type float and specifies the distance between grid lines
• n is of type int and specifies the number of lines. Note that to draw a grid with 10 spaces (e.g. 0.0 through 100.0 by delta 10.0) you must specify 11 lines.

```! grid2d.MBS
!
! Draw a square 2-d grid
!

global drawing module grid2d(
float delta;   ! distance between lines
int   n        ! number of lines, including both sides
);

float  hx1, hy1;  ! horizontal lines
float  hx2, hy2;  !
vector hstart, hstop;
float  vx1, vy1;  ! vertical lines
float  vx2, vy2;  !
vector vstart, vstop;
int    ix;
vector xtextpos, ytextpos;

beginmodule

hx1 := 0;
hy1 := 0;
hx2 := hx1 + (delta * (n - 1));
hy2 := 0;

vx1 := 0;
vy1 := 0;
vx2 := 0;
vy2 := vy1 + (delta * (n - 1));

for ix := 0 to (n -1) do

hstart := vec (hx1, hy1);
hstop  := vec (hx2, hy2);
lin_free (#1, hstart, hstop: width=0);

vstart := vec (vx1, vy1);
vstop  := vec (vx2, vy2);
lin_free (#2, vstart, vstop: width=0);

xtextpos := vec (vx1 - 1, -2);
text (#3, xtextpos, 0, str((ix * delta), 2, 1): tsize=1);

ytextpos := vec (-5, hy1);
text (#4, ytextpos, 0, str((ix * delta), 2, 1): tsize=1);

hy1 := hy1 + delta;
hy2 := hy2 + delta;

vx1 := vx1 + delta;
vx2 := vx2 + delta;

endfor;

hstart := vec (0, 0);
hstop  := vec (vx2 - delta, hy2 - delta);
lin_free (#5, hstart, hstop: width=0);

endmodule

```

To invoke this module to display a grid of delta 10 from 0 through 100 (11 lines horizontal, 11 vertical) use, for instance, an active module containing:

```GLOBAL DRAWING MODULE test2d();
BEGINMODULE
part(#1,grid2d(10, 11));
ENDMODULE
```

### Legal Matters

With the exception of any material noted as being in the public domain, the text, images, and encoding of this document are copyright © 1998 by David M. MacMillan.

The author has no relationship with Microform AB, and this Tutorial is neither a product of nor endorsed by Microform AB.

"Varkon" is a registered trademark of Microform AB, Sweden.

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In no event will the author(s) or editor(s) of this document be liable to you or to any other party for damages, including any general, special, incidental or consequential damages arising out of your use of or inability to use this document or the information contained in it, even if you have been advised of the possibility of such damages.

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Version 1.4, 1998/06/17. Feedback to dmm@lemur.com
http://www.database.com/~lemur/vk-grid2d.html

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