preview: draw stock outlines from (WORKPIECE,...) comments

[alex-pres]

Followup for #4429

A (WORKPIECE,BOX|CYLINDER|TUBE,...) comment declares the stock the program is cut from; the preview draws it as a translucent wireframe, and get_workpieces() hands a GUI the declared params and the outline in machine coordinates. Extents unchanged.

Supported formats:

(WORKPIECE,BOX,XMIN=0,YMIN=0,ZMIN=-40,XMAX=100,YMAX=100,ZMAX=0)
(WORKPIECE,CYLINDER,AXIS=Z,X=0,Y=0,ZMIN=-40,ZMAX=0,DIAMETER=80)
(WORKPIECE,TUBE,AXIS=Z,X=0,Y=0,ZMIN=-40,ZMAX=0,DIAMETER=80,INNER_DIAMETER=40)

If more than 1 specified, it is added to previous. As additional bonus, get_workpieces() function is available for display GUI to create useful shortcuts (like travel to workpiece left side) and especially for probing of workpiece location on the table. Workpieces are rendered in current g-code coordinate system (G54, etc.) and auto-switch inch/mm like rest of gremlin code.

What does it look like

[alex-pres]

Instruction for Autodesk Fusion post-processor:

edit .cps file

add function

function writeLinuxcncStockInfo() {
  var wp = getWorkpiece();                     // BoundingBox, in the setup's WCS
  // var d  = Vector.diff(wp.upper, wp.lower);    // size - if you ever need it

  writeComment("WORKPIECE,BOX" +
               ",XMIN=" + xyzFormat.format(wp.lower.x) +
               ",XMAX=" + xyzFormat.format(wp.upper.x) +
               ",YMIN=" + xyzFormat.format(wp.lower.y) +
               ",YMAX=" + xyzFormat.format(wp.upper.y) +
               ",ZMIN=" + xyzFormat.format(wp.lower.z) +
               ",ZMAX=" + xyzFormat.format(wp.upper.z) );

}

Call it from onOpen(), after the format objects are created.

[c-morley]

Can you add the code from gemlin into qt5_grsphics too please.

[alex-pres]

Actually it worked already in QT too, the commit message was misleading.

I only added setShowWorkpiece(self, state); getShowWorkpiece(self); and related QT designer property into this force-pushed commit. The rest of code is unchanged.

[c-morley]

Thank you. This looks useful.