kongnet / turtle

Simulate Turtle Geometry

Turtle

Simulate Turtle Geometry

• fd() forward
• bk() backward
• rt() right
• lt() left
• pu() penup
• pd() pendown
• repeat()
• setxy() put the turtle at coordinate(x, y)
• home() bring the turtle at the center
• cs() clearscreen

run() vs go(), go() can clear atction queue, run() not

const t = new Turtle({ debug: false })
t.fd(10).rt(90).repeat(4).go() // draw a square

/*
  combine t0, t1
  t0,t1 can play solo, use t.to('t0').run()
*/
const t = new Turtle({ debug: false })

t.to('t0').fd(0.1).rt(2).repeat(90)
t.to('t1').fd(0.1).lt(2).repeat(90)
t.to().add('t0').add('t1').rt(90).repeat(4).rt(36).repeat(10).go()

console.log(t.list) // ['_mainproc', 't0', 't1']

• demo1 regular polygon
• demo2 regular star polygon
• demo3 constant velocity helix + golden spiral
• demo4 variable speed helix
• demo5 Koch curve
• demo6 Fractal Tree
• demo7 Sierpinski triangle
• demo8 Leaf

Animation

let t = new Turtle({ debug: false, animate: 2 }) // draw speed
t.to('t0').fd(0.1).rt(2).repeat(90) // combine
t.to('t1').fd(0.1).lt(2).repeat(90)
t.to().add('t0').add('t1').rt(90).repeat(4).rt(36).repeat(10).go()

turtle-maze.html