function OnAbout(event)
   ctrl = event:GetTextCtrl()
   ctrl:AppendText("Purelogic post processor for Pumotix THC\n")
   ctrl:AppendText("\n")
   ctrl:AppendText("Modal G-codes and coordinates\n")
   ctrl:AppendText("Comments enclosed with ( and )\n")
   ctrl:AppendText("M03/M05 turn the torch on/off\n")
   ctrl:AppendText("Incremental IJ\n")
   ctrl:AppendText("Designed for use with Pumotix THC and macros\n")
end

function OnInit()

   post.SetCommentChars ("()", "[]")  --make sure ( and ) characters do not appear in system text
   post.Text (" (Post processor: ", postName, ")\n")
   post.Text (" (Date: ", date, ")\n")
   if(scale == metric) then
      post.Text (" G21 (Units: Metric)\n") --metric mode
   else
      post.Text (" G20 (Units: Inches)\n") --inch mode
   end
   post.Text (" G90 G91.1 G40\n F1\n")

   post.Text (" M101\n")
   post.Text (" G00")
   post.ModalNumber (" Z", safeZ * scale, "0.0000")
   post.Eol()

   switchoffset = -0.08
   bigarcs = 1 --stitch arc segments together
   minArcSize = 0.05 --arcs smaller than this are converted to moves
   
   regState = true
end

function OnNewLine()
   post.Text ("N")
   post.Number (lineNumber, "0000")
   lineNumber = lineNumber + 10
end


function OnFinish()
   post.Text (" M05\n M30\n")
end

function OnRapid()
   -- disable Z movement
   if(math.hypot(endX-currentX , endY-currentY) < 0.001) then return end
   post.ModalText (" G00")
   post.ModalNumber (" X", endX * scale, "0.0000")
   post.ModalNumber (" Y", endY * scale, "0.0000")
   post.Eol()
end

function OnMove()
   if(math.hypot(endX-currentX , endY-currentY) < 0.001) then return end
   RegControl()
   post.ModalText (" G01")
   post.ModalNumber (" X", endX * scale, "0.0000")
   post.ModalNumber (" Y", endY * scale, "0.0000")
   post.ModalNumber (" F", feedRate * scale, "0.###")
   post.Eol()
end

function OnArc()
   RegControl()
   if(arcAngle <0) then
      post.ModalText (" G03")
   else
      post.ModalText (" G02")
   end
   post.NonModalNumber (" X", endX * scale, "0.0000")
   post.NonModalNumber (" Y", endY * scale, "0.0000")
   post.Text (" I")
   post.Number ((arcCentreX - currentX) * scale, "0.0000")
   post.Text (" J")
   post.Number ((arcCentreY - currentY) * scale, "0.0000")
   post.ModalNumber (" F", feedRate * scale, "0.###")
   post.Eol()
end

function RegControl()
   if (leadinType ~= 0 and toolClass == "PlasmaTool") then
      newRegState = false
   else
      newRegState = true
   end
   
   if (newRegState ~= regState) then
      regState = newRegState
      if (newRegState == false) then
         post.Text (" M103")
      else
         post.Text (" M104")
      end
      post.Eol()
   end
end


function OnPenDown()
   post.Text(" M100\n")
   post.Text (" G00")
   post.ModalNumber (" Z", pierceHeight * scale, "0.0000")
   post.Eol()
   post.Text(" M03\n")
   if (pierceDelay > 0.001) then
      post.Text (" G04 P")
      post.Number (pierceDelay,"0.###")
      post.Eol()
   end
   post.Text (" G00")
   post.ModalNumber (" Z", cutHeight * scale, "0.0000")
   post.ModalNumber (" F", feedRate * scale, "0.###")
   post.Eol()
   
   post.CancelModalNumbers()
   post.ModalText ("")
end


function OnPenUp()
   -- Move head Up to safety Z
   post.Text (" M05\n")
   post.Text (" G00")
   post.ModalNumber (" Z", safeZ * scale, "0.0000")
   post.Eol()
   
   post.CancelModalNumbers()
   post.ModalText ("")
   
   regState = true
end


function OnNewOperation()
   if (plungeRate <= 0) then
      post.Warning("WARNING: Plunge rate is zero")
   end
   if (feedRate <= 0) then
      post.Warning("WARNING: Feed rate is zero")
   end
   post.CancelModalNumbers()
   post.ModalText ("")
end

function OnComment()
  post.Text(" (",commentText,")\n")
end

function OnNewPart()
end

function OnDrill()
   OnRapid()
  
   post.Text(" M100\n")
   post.Text (" G00")
   post.ModalNumber (" Z", pierceHeight * scale, "0.0000")
   post.Eol()
   post.Text(" M03\n")
   if (pierceDelay > 0.001) then
      post.Text (" G04 P")
      post.Number (pierceDelay,"0.###")
      post.Eol()
   end
   
   post.CancelModalNumbers()
   post.ModalText ("")
   
   -- Move head Up to safety Z
   post.Text (" M05\n")
   post.Text (" G00")
   post.ModalNumber (" Z", safeZ * scale, "0.0000")
   post.Eol()
   
   post.CancelModalNumbers()
   post.ModalText ("")
  
   OnRapid()
end