Turtle Graphics for Flutter 1

turtle graphics

flutter_turtle is a simple implementation of turtle graphics for flutter. it simply uses a custom painter to draw graphics by a series of logo-like commands.

why i make this?

it is always fun to make your own dsl!

example

a quick example:

@override
  widget build(buildcontext context) {
    return scaffold(
      appbar: appbar(title: text(widget.title)),
      body: turtleview(
        child: container(),
        commands: [
          pendown(),
          setcolor((_) => color(0xffff9933)),
          setstrokewidth((_) => 2),
          repeat((_) => 20, [
            repeat((_) => 180, [
              forward((_) => 25.0),
              right((_) => 20),
            ]),
            right((_) => 18),
          ]),
          penup(),
        ],
      ),
    );
  }

commands

currently supported commands are including:

turtle motion

• pendown
• penup
• left
• right
• forward
• back
• setcolor
• setstrokewidth
• goto
• resetposition
• resetheading

flow control

• ifelse
• repeat

macros

• setmacro
• runmacro

misc

• exec