DMM Varkon® Tutorial
A Beginner's Guide to the Varkon
Parametric Modeling and CAD Application Development System
By David M. MacMillan
The following MBS module shows a vertical stack of lines through a range of line widths. Lines are displayed with the width number on the left and the Y coordinate of the line, relative to the middle of the first line displayed, on the right. A small line on the right of each line indicates the line's centerline.
The calling syntax is:
showwidth (firstline, numlines, linespacing, linelength);
All parameters are integers.
On my system, pens that draw on the screen seem to be circular in shape, resulting in a radius at each end of the line. However, the pens that plot seem to be lines, and there is no radius on these lines as plotted.
! showwidth.MBS
!
! Draw examples of all line widths
!
global drawing module showwidth(
int firstline;
int numlines;
int linespacing;
int linelength
);
vector start, stop;
float x1, y1;
float x2, y2;
float dx, dy;
int ix;
vector textpos;
beginmodule
dx := linelength;
dy := linespacing;
x1 := 0;
y1 := 0;
x2 := x1 + dx;
y2 := 0;
start := vec (x1, y1);
stop := vec (x1, y2 + dy);
lin_free (#1, start, stop: width=0);
start := vec (x2, y1);
stop := vec (x2, y2 + dy);
lin_free (#2, start, stop: width=0);
for ix := firstline to (firstline + numlines - 1) do
y1 := y1 + dy;
y2 := y2 + dy;
start := vec (x1, y1);
stop := vec (x2, y2);
textpos := vec (x1 - 20, y1);
text (#3, textpos, 0, str(ix, 2, 0));
lin_free (#4, start, stop: width=ix);
start := vec (x1, y1);
stop := vec (x1, y2 + dy);
lin_free (#5, start, stop: width=0);
start := vec (x2, y1);
stop := vec (x2, y2 + dy);
lin_free (#6, start, stop: width=0);
start := vec (x2 + 5, y2);
stop := vec (x2 + 55, y2);
lin_free (#7, start, stop: width=0);
textpos := vec (x2 + 20, y2);
text (#8, textpos, 0, str((ix * 20), 3, 1));
endfor;
endmodule
To invoke this module to display the lines from 0 to 4 (5 lines total), use, for instance, an active module containing:
GLOBAL DRAWING MODULE test2d();
BEGINMODULE
part(#1,showwidth(0, 5, 20, 200));
ENDMODULE
To invoke this module to display the lines from 7 to 16 (10 lines total), use, for instance, an active module containing:
GLOBAL DRAWING MODULE test2d();
BEGINMODULE
part(#1,showwidth(7, 10, 30, 300));
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-penwidth.html
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