[Chris64]

OK...I've put together the basics of what should work for the arc. It's ugly as this isn't my language of choice and I'm simply not familiar with it.

But, I am having a weird problem. The modalnumber function in particular. I'm not sure if this is a custom function within Sheetcam but it seems to be selectively not displaying anything (no real reason that I can see).

but here's the arc portion of the post file:

function arc()
   --Here is where we need to break an arc into quadrants
   --arccenterx & y is it's physical location
   --I'm not allowing Z arcs since my machine can't do it
   --
   --Quadrants 1(X+Y+),2(X+Y-),3(X-Y-),4(X-Y+)

   arc_currentx = arccentrex - currentx
   arc_currenty = arccentrey - currenty
   arc_endx = arccentrex - endx
   arc_endy = arccentrey - endy
   arc_distancetocenter = math.sqrt((arc_currentx * arc_currentx) + (arc_currenty * arc_currenty))
--   text (arc_distancetocenter )
   current_quadrant = ""
   finish_quadrant = ""

   if (arc_currentx >= 0 and arc_currenty >= 0) then
	current_quadrant = "1"; end
   if (arc_currentx >= 0 and arc_currenty <= 0) then
	current_quadrant = "2"; end
   if (arc_currentx <= 0 and arc_currenty <= 0) then
	current_quadrant = "3"; end
   if (arc_currentx <= 0 and arc_currenty >= 0) then
	current_quadrant = "4"; end
   if (arc_endx >= 0 and arc_endy >= 0) then
	finish_quadrant = "1"; end
   if (arc_endx >= 0 and arc_endy <= 0) then
	finish_quadrant = "2"; end
   if (arc_endx <= 0 and arc_endy <= 0) then
	finish_quadrant = "3"; end
   if (arc_endx <= 0 and arc_endy >= 0) then
	finish_quadrant = "4"; end

   text("quad1: ")
   text(current_quadrant)
   text("   quad2: ")
   text(finish_quadrant)
   text("\n")
   
   if (current_quadrant == finish_quadrant) then
   --if the move starts and ends in the same quadrant
      text("**same quadrant ")
      modalnumber (" X", endx * scale, "0.0000")
      modalnumber (" y", endy * scale, "0.0000")
      modalnumber (" /X", (arccentrex - currentx) * scale, "0.0000")
      modalnumber (" /y", (arccentrey - currenty) * scale, "0.0000")
      text("\n")
   else
      while (current_quadrant ~= finish_quadrant) do
      --finish point is not in the current quadrant
         currentx = 0
         currenty = 0
         if(arcangle <0) then
            if (current_quadrant == "1") then
               new_current_quadrant = "4"
               currentx = -arc_distancetocenter
               currenty = arc_distancetocenter
            end
            if (current_quadrant == "2") then
               new_current_quadrant = "1"
               currentx = arc_distancetocenter
               currenty = arc_distancetocenter
            end
            if (current_quadrant == "3") then
               new_current_quadrant = "2"
               currentx = arc_distancetocenter
               currenty = -arc_distancetocenter
            end
            if (current_quadrant == "4") then
               new_current_quadrant = "3"
               currentx = -arc_distancetocenter
               currenty = -arc_distancetocenter
            end
            current_quadrant = new_current_quadrant 
            text (" CCW ")
         else
            if (current_quadrant == "4") then
               new_current_quadrant = "1"
               currentx = arc_distancetocenter
               currenty = arc_distancetocenter
            end
            if (current_quadrant == "3") then
               new_current_quadrant = "4"
               currentx = -arc_distancetocenter
               currenty = arc_distancetocenter
            end
            if (current_quadrant == "2") then
               new_current_quadrant = "3"
               currentx = -arc_distancetocenter
               currenty = -arc_distancetocenter
            end
            if (current_quadrant == "1") then
               new_current_quadrant = "2"
               currentx = arc_distancetocenter
               currenty = -arc_distancetocenter
            end
            current_quadrant = new_current_quadrant 
            text "cw"
         end   
         text ("Step Arc: ")
         text (current_quadrant)
         modalnumber ("# X", currentx * scale, "0.0000")
         modalnumber ("# y", currenty * scale, "0.0000")
         modalnumber ("# /X", (arccentrex - currentx) * scale, "0.0000")
         modalnumber ("# /y", (arccentrey - currenty) * scale, "0.0000")
         text ("\n")
      end
      --we have moved into the finish quadrant
      text("**exit quadrant ")
      modalnumber ("$ X", endx * scale, "0.000")
      modalnumber ("$ y", endy * scale, "0.000")
      modalnumber ("$ /X", (arccentrex - currentx) * scale, "0.000")
      modalnumber ("$ /y", (arccentrey - currenty) * scale, "0.000")
      text("\n")
   end
   eol()
end

Note - the values are still a messed up hybrid of relative and absolute...ignore that for now. Also I have some random characters infront of arcs...this is just to verify the results I'm getting are firing the right lines.

The problem I'm having with the output is this:

**same quadrant  X2.3966 y-0.0675 /X-0.0675 /y0.0000
 X0.0000 Y-0.0675
quad1: 4   quad2: 2
cwStep Arc: 1# X0.0675# y0.0675# /X-0.0675# /y-0.0675
cwStep Arc: 2# y-0.0675# /y0.0675
**exit quadrant $ X-0.067$ y0.000$ /X-0.068$ /y0.068
 X-0.0675 Y1.8474

the bolded line is an example of the data simply not showing the results. No X value or /X although there does appear to be data there.