//
// G-code
//
// Neil Gershenfeld 
// (c) Massachusetts Institute of Technology 2017
// 
// This work may be reproduced, modified, distributed, performed, and 
// displayed for any purpose, but must acknowledge the mods
// project. Copyright is retained and must be preserved. The work is 
// provided as is; no warranty is provided, and users accept all 
// liability.
//
// closure
//
(function(){
//
// module globals
//
var mod = {}
//
// name
//
var name = 'G-code'
//
// initialization
//
var init = function() {
   mod.cutspeed.value = 20
   mod.plungespeed.value = 20
   mod.jogspeed.value = 75
   mod.jogheight.value = 5
   mod.spindlespeed.value = 10000
   mod.unitsin.checked = true   
   }
//
// inputs
//
var inputs = {
   toolpath:{type:'object',
      event:function(evt){
         mod.name = evt.detail.name
         mod.path = evt.detail.path
         mod.dpi = evt.detail.dpi
         mod.width = evt.detail.width
         mod.height = evt.detail.height
         make_path()
         }}}
//
// outputs
//
var outputs = {
   file:{type:'object',
      event:function(str){
         obj = {}
         obj.name = mod.name+".sbp"
         obj.contents = str
         mods.output(mod,'file',obj)
         }}}
//
// interface
//
var interface = function(div){
   mod.div = div
   //
   // cut speed
   //
   div.appendChild(document.createTextNode('cut speed: '))
   var input = document.createElement('input')
      input.type = 'text'
      input.size = 6
      div.appendChild(input)
      mod.cutspeed = input
   div.appendChild(document.createTextNode(' (mm/s)'))
   div.appendChild(document.createElement('br'))
   //
   // plunge speed
   //
   div.appendChild(document.createTextNode('plunge speed: '))
   var input = document.createElement('input')
      input.type = 'text'
      input.size = 6
      div.appendChild(input)
      mod.plungespeed = input
   div.appendChild(document.createTextNode(' (mm/s)'))
   div.appendChild(document.createElement('br'))
   //
   // jog speed
   //
   div.appendChild(document.createTextNode('jog speed: '))
   var input = document.createElement('input')
      input.type = 'text'
      input.size = 6
      div.appendChild(input)
      mod.jogspeed = input
   div.appendChild(document.createTextNode(' (mm/s)'))
   div.appendChild(document.createElement('br'))
   //
   // jog height
   //
   div.appendChild(document.createTextNode('jog height: '))
   var input = document.createElement('input')
      input.type = 'text'
      input.size = 6
      div.appendChild(input)
      mod.jogheight = input
   div.appendChild(document.createTextNode(' (mm)'))
   div.appendChild(document.createElement('br'))
   //
   // spindle speed
   //
   div.appendChild(document.createTextNode('spindle speed: '))
   var input = document.createElement('input')
      input.type = 'text'
      input.size = 6
      div.appendChild(input)
      mod.spindlespeed = input
   div.appendChild(document.createTextNode(' (RPM)'))
   div.appendChild(document.createElement('br'))
   //
   // file units
   //
   div.appendChild(document.createTextNode('file units:'))
   var input = document.createElement('input')
      input.type = 'radio'
      input.name = mod.div.id+'units'
      input.id = mod.div.id+'unitsin'
      div.appendChild(input)
      mod.unitsin = input
   div.appendChild(document.createTextNode('in'))
   var input = document.createElement('input')
      input.type = 'radio'
      input.name = mod.div.id+'units'
      input.id = mod.div.id+'unitsmm'
      div.appendChild(input)
      mod.unitsmm = input
   div.appendChild(document.createTextNode('mm'))
   }
//
// local functions
//
function make_path() {
   var dx = units*mod.width/mod.dpi
   var nx = mod.width
   var scale = dx/(nx-1)
   var jog_speed = parseFloat(mod.jogspeed.value)/25.4
   var cut_speed = parseFloat(mod.cutspeed.value)/25.4
   var plunge_speed = parseFloat(mod.plungespeed.value)/25.4
   var jog_height = parseFloat(mod.jogheight.value)/25.4
   var spindle_speed = parseFloat(mod.spindlespeed.value)
   var tool = parseInt(mod.tool.value)
   str = "%\n" // tape start
   // xy plane, inch mode, cancel diameter compensation, cancel length offset
   // coordinate system 1, cancel motion, non-incremental motion, feed/minute mode
   str += "G17\n"
   str += "G20\n"
   str += "G40\n"
   str += "G49\n"
   str += "G54\n"
   str += "G80\n"
   str += "G90\n"
   str += "G94\n"
   str += "T"+tool+"M06\n" // tool selection, tool change
   str += "F"+cut_speed.toFixed(4)+"\n" // feed rate
   str += "S"+spindle_speed+"\n" // spindle speed
   if (mod.coolant.checked)
      str += "M08\n" // coolant on
   str += "G00Z"+jog_height.toFixed(4)+"\n" // move up before starting spindle
   str += "M03\n" // spindle on clockwise
   str += "G04 P1\n" // give spindle 1 second to spin up
   //
   // follow segments
   //
   for (var seg = 0; seg < mod.path.length; ++seg) {
      //
      // move up to starting point
      //
      x = scale*mod.path[seg][0][0]
      y = scale*mod.path[seg][0][1]
      str += "Z"+jog_height.toFixed(4)+"\n"
      str += "G00X"+x.toFixed(4)+"Y"+y.toFixed(4)+"Z"+jog_height.toFixed(4)+"\n"
      //
      // move down
      //
      z = scale*mod.path[seg][0][2]
      str += "G01Z"+z.toFixed(4)+" F"+plunge_speed.toFixed(4)+"\n"
      str += "F"+cut_speed.toFixed(4)+"\n" //restore xy feed rate
      for (var pt = 1; pt < mod.path[seg].length; ++pt) {
         //
         // move to next point
         //
         x = scale*mod.path[seg][pt][0]
         y = scale*mod.path[seg][pt][1]
         z = scale*mod.path[seg][pt][2]
         str += "G01X"+x.toFixed(4)+"Y"+y.toFixed(4)+"Z"+z.toFixed(4)+"\n"
         }
      }
   //
   // finish
   //
   str += "G00Z"+jog_height.toFixed(4)+"\n" // move up before stopping spindle
   str += "M05\n" // spindle stop
   if (mod.coolant.checked)
      str += "M09\n" // coolant off
   str += "M30\n" // program end and reset
   str += "%\n" // tape end
   //
   // output file
   //
   str += "MZ,"+jog_height.toFixed(4)+"\r\n"
   outputs.file.event(str)
   }
//
// return values
//
return ({
   name:name,
   init:init,
   inputs:inputs,
   outputs:outputs,
   interface:interface
   })
}())