function OnAbout(event)
   ctrl = event:GetTextCtrl()
   ctrl:AppendText("plasma MP1000-THC post processor\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 - set in mach2\n")
   ctrl:AppendText("The torch is referenced at cut start and every 500mm of movement thereafter\n")
   ctrl:AppendText("Designed for use with Mach3 and CandCNC MP1000-THC and Floating head Touch-n-Go\n")
   ctrl:AppendText("Post variables:\n")
   ctrl:AppendText("refdistance - set the distance between each reference\n")
   ctrl:AppendText("switchoffset - set your net switch offset amount \n")
end


--post.SetOptions(post.ARC_SEGMENTS)


--   created 1/1/06
--   Based on plasma1.post



function OnInit()

   post.SetCommentChars ("()", "[]")  --make sure ( and ) characters do not appear in system text
   post.Text (" (Filename: ", fileName, ")\n")
   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 (" G53 G90 G40\n F1\n")
   minArcSize = 0.2 --arcs smaller than this are converted to moves

   dist = 9999999
   refdistance = 10* scale
--Put your switch offset value here
   switchoffset =.2576
   lastz = 0
end

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


function OnFinish()
   endZ = safeZ
   OnRapid()
   endX = 0
   endY = 0
   OnRapid()
   post.Text (" M05 M30\n")
end

function OnRapid()
   dist = dist + math.hypot(endX-currentX , endY-currentY)
   post.ModalText (" G00")
   post.ModalNumber (" X", endX * scale, "0.0000")
   post.ModalNumber (" Y", endY * scale, "0.0000")
   post.ModalNumber (" Z", endZ * scale, "0.0000")
   post.Eol()
end

function OnMove()
   dist = dist + math.hypot(endX-currentX , endY-currentY)
   post.ModalText (" G01")
   post.ModalNumber (" X", endX * scale, "0.0000")
   post.ModalNumber (" Y", endY * scale, "0.0000")
   post.ModalNumber (" Z", endZ * scale, "0.0000")
   post.ModalNumber (" F", feedRate * scale, "0.0###")
   post.Eol()
end

function OnArc()
   dist = dist + math.hypot(endX-currentX , endY-currentY)
   if(arcAngle <0) then
      post.ModalText (" G03")
   else
      post.ModalText (" G02")
   end
   post.ModalNumber (" X", endX * scale, "0.0000")
   post.ModalNumber (" Y", endY * scale, "0.0000")
   post.ModalNumber (" Z", endZ * 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, "0.0###")
   post.Eol()
end


function OnPenDown()
   if(dist >= (refdistance/scale)) then
      dist = 0
--      modaltext (" G00")
--      text(" Z")
--      number (pierceheight  * scale, "0.0000")
--      eol()
      post.ModalText(" G28.1 Z")
      post.Number(3 * scale, "0.00")
      post.Eol()
      post.ModalText(" G92 Z0.0\n")
      post.ModalText (" G00")
      post.Text(" Z")
      post.Number (switchoffset, "0.0000")
      post.Eol()
      post.ModalText(" G92 Z0.0\n")
      post.ModalText (" G00")
      post.Text(" Z")
      post.Number (pierceHeight  * scale, "0.0000")
      post.Eol()
   else
      post.ModalText (" G00")
      post.Text(" Z")
      post.Number (pierceHeight  * scale, "0.0000")
      post.Eol()
   end
   if (preheat > 0) then
      post.Text ("\n G04 P")
      post.Number (preheat,"0.###")
      post.Eol()
   end
   post.Text ("\n M03\n")
   if (pierceDelay > 0) then
      post.Text (" G04 P")
      post.Number (pierceDelay,"0.###")
      post.Eol()
   end
end


function OnPenUp()
   post.Text (" M05\n")
   if (endDelay > 0) then
      post.Text (" G04 P")
      post.Number (endDelay,"0.###")
      post.Eol()
   end
end


function OnNewOperation()
   post.Text (" (Operation: ", operationName, ")\n")
end

function OnToolChange()
   post.Text (" M06 T")
   post.Number (tool, "0")
   post.ModalNumber(" F",feedRate * scale,"0.#")
   post.Text ("  (", toolName, ")\n")
end

function OnNewPart()
   post.Text(" (Part: ",partName,")\n");
end

function OnDrill()
   OnRapid()
   OnPenDown()
   endZ = drillZ
   OnMove()
   OnPenUp()
   endZ = safeZ
   OnRapid()
end