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 thick lines through a range of pen colors. Lines are displayed with the pen number on the left.
The calling syntax is:
showcolors (firstcolor, numcolors, colorspacing, colorlength);
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.
! showcolors.MBS
!
! Draw examples of all line widths
!
global drawing module showcolors(
int firstcolor;
int numcolors;
int colorspacing;
int colorlength
);
vector start, stop;
float x1, y1;
float x2, y2;
float dx, dy;
int ix;
vector textpos;
beginmodule
dx := colorlength;
dy := colorspacing;
x1 := 0;
y1 := 0;
x2 := x1 + dx;
y2 := 0;
for ix := firstcolor to (firstcolor + numcolors - 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=10, pen=ix);
endfor;
endmodule
To invoke this module to display the lines from 0 to 14 (15 lines total), use, for instance, an active module containing:
GLOBAL DRAWING MODULE test2d();
BEGINMODULE
part(#1,showcolors(0, 15, 20, 200));
ENDMODULE
Pens greater than the highest pen defined in the Varkon X Window System resource file default to black. In this example, pen 11 is the highest numbered pen defined.
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
1.3, 1998/06/17.
Feedback to dmm@lemur.com
http://www.database.com/~lemur/vk-pencolors.html
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