The X-window program xeukleides is a graphical front-end for the
language Eukleides. It has two modes: an editing mode and a viewing mode. To
start xeukleides, editing the file created in the first section,
type:
$ xeukleides triangle.euk
To start in viewing mode instead, add the -V option. You can
switch between modes, by pressing the escape key. Since the editing mode is
based on the GTK+ text editor widget, xeukleides has all the
features of a simple text editor. Here is a list of some useful shortcuts:
Alt-F
| One word forward. |
Alt-B
| One word backward. |
Alt-D
| Delete one word forward. |
Ctrl-W
| Delete one word backward. |
Ctrl-U
| Delete current line. |
Ctrl-K
| Delete to end of line. |
Ctrl-X
| Cut selection to clipboard. |
Ctrl-C
| Copy selection to clipboard. |
Ctrl-P
| Paste selection from clipboard. |
The drawn triangle is an optimal scalene triangle (i.e. it is an acute
triangle which shape is as far as possible from the shape of right or isosceles
triangles). You may want to draw another kind of triangle. The language
Eukleides provides a wide variety of ways to define triangles. See what happens
if you replace the triangle command with right,
isosceles or equilateral.
These commands can take some optional parameters. For instance:
A B C triangle(6, 5, 4)
defines a triangle ABC such that AB = 6 cm, BC = 5 cm and AC = 4 cm.
Another example:
A B C isosceles(6, 50:)
defines an isosceles triangle ABC such that AB = 6 cm and the angles at vertices
A and B equal 50°.
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