function OnAbout(event)
   ctrl = event:GetTextCtrl()
   ctrl:AppendText("plasma THC300 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\n")
   ctrl:AppendText("The torch is referenced at cut start and every 500mm of movement thereafter\n")
   ctrl:AppendText("Designed for use with Mach2 and Campbell Designs THC300\n")
   ctrl:AppendText("Post variables:\n")
   ctrl:AppendText("refdistance - set the distance between each reference\n")
end



--  revision 3/2/07
--  Removed final safety move. This is now done in SheetCam

--   revision 7/10/05
--   Added new arc handling

--   created 27/10/04
--   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 S500\n")

   dist = 9999999
   refdistance = 500 * scale
   switchoffset = -0.08
   bigarcs = 1 --stitch arc segments together
   minArcSize = 0.05 --arcs smaller than this are converted to moves
end

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


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

function OnRapid()
   if(math.hypot(endX-currentX , endY-currentY) < 0.001 and endZ < currentZ) then return end
   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.###")
   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.NonModalNumber (" X", endX * scale, "0.0000")
   post.NonModalNumber (" 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
      post.ModalText(" G31 Z -100")
      post.ModalNumber (" F", 500 * scale, "0.0###")
      post.Eol()
      post.ModalText(" G92")
      post.NonModalNumber(" Z", switchoffset, "0.0000")
      post.Eol()
      post.CancelModalNumbers()
   end
--[[   post.ModalText (" G00")
   post.ModalNumber (" X", endX * scale, "0.0000")
   post.ModalNumber (" Y", endY * scale, "0.0000")
   post.Eol()]]
   if (preheat > 0) then
      post.ModalText (" G00")
      post.ModalNumber (" Z", cutHeight * scale, "0.0000")
      post.Eol()
      post.Text(" M801\n G04 P 0.5\n M802\n G04 P0.1\n M902")
      post.Text ("\n G04 P")
      post.Number (preheat,"0.###")
      post.Eol()
   end
   post.ModalText (" G00")
   post.ModalNumber (" Z", pierceHeight * scale, "0.0000")
   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")
   if (plungeRate <= 0) then
      post.Warning("WARNING: Plunge rate is zero")
   end
   if (feedRate <= 0) then
      post.Warning("WARNING: Feed rate is zero")
   end
end

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

function OnToolChange()
   post.Text (" M06 T")
   post.Number (tool, "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
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