70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
'use strict'
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// Dotgrid UDP Listener
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// Ex: 1a0156(6 characters 0-9a-z)
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// 0 layer[0-2]
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// 1 type[lcrd*]
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// 2 from[0-z][0-z]
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// 4 to[0-z][0-z]
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const dgram = require('dgram')
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function Listener (dotgrid) {
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this.server = dgram.createSocket('udp4')
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function base36 (c) {
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return clamp(['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y'].indexOf(c.toLowerCase()), 0, 36) * 15 + 15
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}
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function clear () {
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dotgrid.tool.erase()
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}
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function operate (data) {
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if (!data) { return }
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if (!dotgrid.tool.layers[data.layer]) { return }
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dotgrid.tool.addSegment(data.type, [data.from, data.to], data.layer)
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}
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function draw () {
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dotgrid.renderer.update(true)
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}
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function parse (msg) {
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if (msg === '' || msg === '*') {
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return draw()
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}
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if (['0', '1', '2'].indexOf(msg) > -1) {
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return clear()
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}
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const layer = parseInt(msg.substr(0, 1))
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const type = { 'l': 'line', 'c': 'arc_c', 'r': 'arc_r', '*': 'draw' }[msg.substr(1, 1).toLowerCase()]
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const from = { x: base36(msg.substr(2, 1)), y: base36(msg.substr(3, 1)) }
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const to = { x: base36(msg.substr(4, 1)), y: base36(msg.substr(5, 1)) }
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return { layer: layer, type: type, from: from, to: to }
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}
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function clamp (v, min, max) {
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return v < min ? min : v > max ? max : v
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}
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// Server
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this.server.on('message', (msg, rinfo) => {
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operate(parse(`${msg}`))
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})
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this.server.on('listening', () => {
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const address = this.server.address()
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console.log(`Server listening for UDP:\n ${address.address}:${address.port}`)
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})
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this.server.on('error', (err) => {
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console.log(`Server error:\n ${err.stack}`)
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server.close()
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})
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this.server.bind(49161)
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}
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