scottjanousek / line-us-js-kit

A fun way to use your Line-us

Line-us JS Kit

A fun way to use your Line-us.

1. Write commands in Javascript
2. Preview the output in the browser
3. Click the button and your Line-us will draw it!

Quick Start

1. Make sure Node.js is installed on your machine.
2. Ensure Line-us is on the same wifi as your machine
3. Open terminal and run the commands below.

$ git clone https://github.com/funwithtriangles/line-us-js-kit.git
$ cd line-us-js-kit
$ npm install
$ npm start

4. Go to http://localhost:8080/ in any browser

Programmers Guide

Edit sketch/index.js to create your own drawings.

Saving will automatically refresh the browser at http://localhost:8080/ so you can instantly see how your drawing will look.

You have the following commands available:

import { moveTo, lineTo, dot } from '../lib'
import drawPolygon from '../lib/utils/drawPolygon'

// Move pen and draw lines to coordinates (X, Y)
moveTo('900', '800')
lineTo('900', '200')

// Draw a single dot (only for the brave!)
dot('1500', '800')

// Call this at the end
finish()

// Fun polygon util
// center X, center Y, radius, num of vertices, rotation (in radians)
drawPolygon(1300, -500, 80, 3)
drawPolygon(1300, -500, 200, 3, Math.PI)
drawPolygon(1300, -500, 300, 5)

Code Examples

Triangle spiral

import { finish } from '../lib'
import drawPolygon from '../lib/utils/drawPolygon'

const numPoints = 100
const PHI = 1.618
const cx = 1230
const cy = 0

let rad = 40
let x, y, delta

for (let i = 0; i < numPoints; i++) {
  rad += 5
  delta = i * PHI
  x = cx + Math.sin(i * PHI) * rad
  y = cy + Math.cos(i * PHI) * rad
  drawPolygon(x, y, i * 1.1, 3, delta)
}

finish()

Waves

import { moveTo, lineTo, finish } from '../lib'

const PI = Math.PI

const xStart = 700
const xRange = 1100
const yStart = -1000
const yRange = 2000
const numRows = 100
const numPoints = 100
const numWavesX = 4
const numWavesY = 3
const waveAmpY = 150
const waveAmpX = 100

const yStep = yRange / (numRows - 1)
const xStep = xRange / (numPoints - 1)
const deltaStep = PI / (numPoints - 1) * numWavesX
const alphaStep = PI / (numRows - 1) * numWavesY

let delta, alpha
let x, y

for (let i = 0; i < numRows; i++) {
  for (let j = 0; j < numPoints; j++) {
    delta = deltaStep * j
    alpha = alphaStep * i
    x = xStart + (xStep * j) + (Math.sin(alpha) * waveAmpX)
    y = yStart + (i * yStep) + (Math.sin(delta) * waveAmpY)
    if (j === 0) {
      moveTo(x, y)
    } else {
      lineTo(x, y)
    }
  }
}

finish()

Possible Windows issue

You may have trouble getting this to work on Windows. The connection is made using mDNS (Bonjour), so you may need to install Bounjour Print Services if you can't get it working. Unfortunately this doesn't seem to work for Windows 10 machines. Please let me know if you find a way to get it working!

There is more information about how the connection happens on the Line-us programming repo.

Contributing

All contributions welcome!

• Fork a branch from master
• Make changes
• Make a pull request to master

Acknowledgements

• Node code taken from Simple Node Example created by pandrr