Three beginner's questions
Andreas Raab
raab at isgnw.cs.Uni-Magdeburg.DE
Fri Jan 30 00:08:48 UTC 1998
Philippe,
> 1) What is the easiest way to draw a graphical object (e.g., a line)?
> Can you draw in the Workspace or must you draw on a special canvas?
> Could you provide a simple example?
Have a look at class Canvas. The easiest way to draw a line is probably:
(FormCanvas on: Display)
line: 0 at 0 to: 1000 at 1000 width: 1 color: Color black
or, using a more general representation
(Line from: 0 at 0 to: 1000 at 1000 withForm: (Form extent:1 at 1 depth:1) fillBlack)
display
The latter allows more general lines as for instance in:
(Line from: 0 at 0 to: 1000 at 1000 withForm: Form fromUser) display
Hope that helps,
Andreas
--
Linear algebra is your friend - Trigonometry is your enemy.
+===== Andreas Raab ============= (raab at isg.cs.uni-magdeburg.de) =====+
I Department of Simulation and Graphics Phone: +49 391 671 8065 I
I University of Magdeburg, Germany Fax: +49 391 671 1164 I
+=============< http://isgwww.cs.uni-magdeburg.de/~raab >=============+
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