NamesMark / Penguin-lang

A programming language for drawing. 西电编译原理实验项目

Penguin-Lang

This is a compiler for a language that provide a python-like interface to draw figures.

• use cargo runto compile and use it.
• when program launch, you can see an interface like

  >>>

If you enjoy writing code in file, it would be better for you to write the code in a file that has a suffix .pg, and use is as input:

  $> penguin-lang file.pg

Grammar supported:

1. origin is (<num>, <num>);
2. rot is <num>;
3. scale is (<num>, <num>);
4. set x (<num>, <num>);
5. set y (<num>, <num>);
6. set color <color>;
7. set size n;
8. for t from <num> to <num> step <num> draw(<expr of t>, <expr of t>);
9. show;
10. exit/quit/q

Default values:

1. rot = 0
2. origin = (0, 0)
3. scale = (1, 1)
4. color = yellow
5. x = (0, 10)
6. y = (-4, 4)
7. size = 2
8. output -> /graph (unchangeable now)

color support:

• blue
• red
• green
• black
• yellow
• cyan
• magenta

math function support:

• cos
• sin
• tan
• ln
• exp
• sqrt

Example

A proper example can be found in root directory: code.pg.

Enjoy it! :)