DMM Varkon® Tutorial
A Beginner's Guide to the Varkon
Parametric Modeling and CAD Application Development System
By David M. MacMillan
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);
! 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
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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Version
1.4, 1998/06/17.
Feedback to dmm@lemur.com
http://www.database.com/~lemur/vk-grid2d.html
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