'hand drawn' pcb for power connector

experiment/pcb/export/export

@@ -0,0 +1,73 @@
+#!/bin/bash
+
+ifnsvg="../power-conn-pcb_5.svg"
+ifn="../power-conn-pcb_5.ps"
+s=100000
+s_inv=`echo "1.0/$s" | bc -l`
+f_ink=`echo "72/25.4" | bc -l `
+f_ink_inv=`echo "25.4/72" | bc -l `
+
+viewbox=`cat $ifnsvg | xpup '/svg/@viewBox'`
+
+x0=`echo "$viewbox" | cut -f1 -d' '`
+y0=`echo "$viewbox" | cut -f2 -d' '`
+
+x1=`echo "$viewbox" | cut -f3 -d' '`
+y1=`echo "$viewbox" | cut -f4 -d' '`
+
+pstoedit -f gnuplot $ifn raw.gp
+head -n -7 raw.gp > body.gp
+tail -n 7 raw.gp > outline.gp
+
+## A better way?
+## $ xj ../power-conn-pcb_5.svg  | \
+##   jq '.["{http://www.w3.org/2000/svg}svg"]["{http://www.w3.org/2000/svg}g"][] | select( . >= {} ) | select( .["@{http://www.inkscape.org/namespaces/inkscape}label"] == "outline" )'
+
+
+R=0.3
+
+clipcli -t union -S nonzero -O 1 -s body.gp -F -x $s -T -R $R > raw_u.gp
+clipcli -t union -S nonzero -O 1 -s outline.gp -F -x $s -T -R $R >> raw_u.gp
+
+t=`echo "$f_ink_inv / $s" | bc -l` 
+
+cat raw_u.gp | ./gpmat $t 0 0 $t > out.gp
+
+
+###
+
+./xj $ifnsvg | \
+  jq -c '.["{http://www.w3.org/2000/svg}svg"]["{http://www.w3.org/2000/svg}g"]["{http://www.w3.org/2000/svg}circle"][] | [ .["@cx"], .["@cy"] ]' | \
+  tr -d '[]' | sed 's/,/ /g' | \
+  ./gpmat 1 0 0 -1 0 $y1 > drill.txt
+
+###
+
+echo -e "G90\nG21\n\n" > out.ngc
+./gp2ngc out.gp | \
+  grecode -cw >> out.ngc
+
+minx=`./ngc_bounds out.ngc | grep min_x | cut -f2 -d' '`
+miny=`./ngc_bounds out.ngc | grep min_y | cut -f2 -d' '`
+
+echo "# $minx $miny"
+
+#shiftx="-50"
+#shifty="-40"
+
+shiftx="-85"
+shifty="-10"
+
+grecode -shift -$minx -$miny out.ngc | \
+  grecode -shift $shiftx $shifty | \
+  sed 's/^G0\(.*\)/G0 Z1\nG0\1\nG1 Z-1/' | \
+  sed 's/^[gG]1\(.*\)/G1\1 Z-1/' > out_fin.ngc
+
+cat drill.txt | \
+  awk '{ print "G0 Z1\nG0", "X"$1, "Y"$2, "Z1\nG1 Z-1\nG0 Z1\n" }' | \
+  grecode -cw > drill.ngc
+
+grecode -shift -$minx -$miny drill.ngc | \
+  grecode -shift $shiftx $shifty > drill_fin.ngc
+
+cat out_fin.ngc drill_fin.ngc > fin.ngc

experiment/pcb/export/gp2ngc

@@ -0,0 +1,689 @@
+#!/usr/bin/python
+
+from __future__ import print_function
+import os, sys, re, getopt, numpy as np, math, json
+
+from signal import signal, SIGPIPE, SIG_DFL
+signal(SIGPIPE,SIG_DFL)
+
+VERSION = "0.1.0"
+
+ctx = {
+  "units" : "mm", "epsilon" : 1.0/1024.0,
+  "sort": False,
+  "explicit_speed": False,
+  "premul" : 1.0, "premul_x" : 1.0, "premul_y" : 1.0, "premul_z" : 1.0,
+  "header" : "", "footer" : "",
+  "g0speed" : "", "g1speed" : "",
+  "z_active": False,
+  "z_step" : 7.0, "z_height" : 5.0, "z_plunge" : -21.0, "z_0" : 0.0, "z_slow" : "", "z_rapid" : "",
+  "tab_n" : 0, "tab_offset" : 0.0, "tab_length" : 50.0, "tab_height" : 5.0, "tab_slide_factor" : 1/8.0,
+  "tab_default_n" : 4,
+  "close_polygon": True
+}
+
+ctx_laser = {
+  "units" : "mm", "epsilon" : 1.0/1024.0,
+  "sort": False,
+  "explicit_speed": False,
+  "premul" : 1.0, "premul_x" : 1.0, "premul_y" : 1.0, "premul_z" : 1.0,
+  "header" : "", "footer" : "",
+  "g0speed" : "F5000", "g1speed" : "F3000",
+  "z_active": False,
+  "z_step" : 0.0, "z_height" : 0.0, "z_plunge" : 0.0, "z_0" : 0.0, "z_slow" : 0.0, "z_rapid" : 0.0,
+  "tab_n" : 0, "tab_offset" : 0.0, "tab_length" : 2.5, "tab_height" : 0.0, "tab_slide_factor" : 1/8.0,
+  "tab_default_n" : 4,
+  "close_polygon": True
+}
+
+ctx_maslow = {
+  "units" : "mm", "epsilon" : 1.0/(1024.0*1024.0),
+  "sort": False,
+  "explicit_speed": False,
+  "premul" : 1.0, "premul_x" : 1.0, "premul_y" : 1.0, "premul_z" : 1.0,
+  "header" : "", "footer" : "",
+  #"g0speed" : 800.0, "g1speed" : 800.0,
+  "g0speed" : "", "g1speed" : "",
+  "z_active": True,
+  "z_step" : 7.0, "z_height" : 5.0, "z_plunge" : -21.0, "z_0" : 0.0, "z_slow" : "", "z_rapid" : "",
+  #"tab_n" : 3, "tab_offset" : 0.0, "tab_length" : 50.0, "tab_height" : 3.0, "tab_slide_factor" : 1/8.0,
+  "tab_n" : 3, "tab_offset" : 0.0, "tab_length" : 50.0, "tab_height" : 10.0, "tab_slide_factor" : 1/8.0,
+  "tab_default_n" : 3,
+  "close_polygon": True
+}
+
+def usage():
+  print("version:", VERSION)
+  print("usage:")
+  print("")
+  print("    gp2ngc [options] <in-gnuplot> <out-ngc>")
+  print("")
+  print("  [--preset preset]      use preset tool context (options are 'maslow', 'laser')")
+  print("  [-i infile]            input file ('-' for stdin, default)")
+  print("  [-o outfile]           output file ('-' for stdout, default)")
+  print("  [--header str]         string to print before any processing")
+  print("  [--footer str]         string to print after any processing")
+  print("  [--rapid str]          string to append at end of rapid motion (G0)")
+  print("  [--slow str]           string to append at end of slow motion (G1)")
+  print("  [--z-rapid str]        z rapid (default to rapid)")
+  print("  [--z-slow str]         z rapid (default to rapid)")
+  print("  [--z-step dz]          z step down per pass")
+  print("  [--z-raise Z]          z height to raise z to for rapid motion")
+  print("  [--z-plunge z]         z final plunge depth")
+  print("  [--tab-n n]            insert n tabs per contour")
+  print("  [--tab-length s]       tab length")
+  print("  [--tab-height h]       tab height")
+  print("  [--show-context]       show context information")
+  print("  [--close-polygon]      connect first and last point in polygon point list (default)")
+  print("  [--open-polygon]       do not connect first and last point in polygon point list")
+  print("")
+
+def print_polygon_debug(pgn, ofp=sys.stdout):
+  print("", file=ofp)
+  for idx in range(len(pgn)):
+    print("#", idx, pgn[idx]["t"], ":", pgn[idx]["x"], pgn[idx]["y"], pgn[idx]["s"], "n:", pgn[idx]["n"], file=ofp)
+
+def print_polygon_debug2(pgn, ofp=sys.stdout):
+  print("", file=ofp)
+  for idx in range(len(pgn)):
+    z = 0.0
+    if pgn[idx]["t"] == "t": z = 1
+    print(pgn[idx]["x"], pgn[idx]["y"], z, file=ofp)
+
+    #if idx>0 and ((pgn[idx-1]["t"] == "." and pgn[idx]["t"] == "t") or (pgn[idx-1]["t"] == "t" and pgn[idx]["t"] == ".")):
+    #  print( "\n", file=ofp)
+
+
+def cmp_pgn_ele(a,b):
+  if (len(a) == 0): return -1
+  if (len(b) == 0): return 1
+
+  s0 = math.sqrt(a[0][0]*a[0][0] + a[0][1]*a[0][1])
+  s1 = math.sqrt(b[0][0]*b[0][0] + b[0][1]*b[0][1])
+
+  if s0 < s1: return -1
+  if s1 > s0: return  1
+  return 0
+
+def polygons_sort(pgns):
+  pgns.sort(cmp_pgn_ele)
+
+
+def print_polygon(pgn, ofp=sys.stdout):
+  print("", file=ofp)
+  for idx in range(len(pgn)):
+    print(pgn[idx]["x"], pgn[idx]["y"], file=ofp)
+
+
+def crossprodmag(u,v, eps=1.0/1024.0):
+  ux = u["x"]
+  uy = u["y"]
+  us = math.sqrt(ux*ux + uy*uy)
+
+  vx = v["x"]
+  vy = v["y"]
+  vs = math.sqrt(vx*vx + vy*vy)
+
+  if (abs(us) < eps) or (abs(vs) < eps): return 0.0
+
+  return ((ux*vy) - (uy*vx))/(us*vs)
+
+
+def ingest_egest_orig(ctx, ifp = sys.stdin, ofp = sys.stdout):
+  polygons = []
+  polygon = []
+
+  print(ctx["header"], file=ofp)
+
+  line_no=0
+  #for line in sys.stdin:
+  for line in ifp:
+    line = line.strip()
+    line_no += 1
+
+    if (len(line)==0) or (line == ""):
+      if len(polygon)>0:
+        polygons.append(polygon)
+      polygon = []
+      continue
+
+    if line[0]=='#': continue
+
+    r = re.split(r'\s+', line)
+
+    if len(r)!=2:
+      print("Error on line " + str(line_no) + ": number of arguments is not 2 (" + line + ")", file=sys.stderr)
+      sys.exit(1)
+
+    try:
+      x = float(r[0]) * ctx["premul"]
+      y = float(r[1]) * ctx["premul"]
+    except Exception, e:
+      print(e, file=sys.stderr)
+      sys.exit(1)
+
+    polygon.append([x,y])
+
+  for p in polygons:
+    if len(p)==0: continue
+
+    x0 = p[0][0]
+    y0 = p[0][1]
+
+    print("G0", "X" + "{:.10f}".format(x0), "Y" + "{:.10f}".format(y0), sfx_rapid, file=ofp)
+    for xy in p:
+      x = xy[0]
+      y = xy[1]
+      print("G1", "X" + "{:.10f}".format(x), "Y" + "{:.10f}".format(y), ctx["g1speed"], file=ofp)
+
+    if ctx["close_polygon"]:
+      print("G1", "X" + "{:.10f}".format(x0), "Y" + "{:.10f}".format(y0), ctx["g1speed"], file=ofp)
+
+    print(file=ofp)
+
+  print(sfx, file=ofp)
+
+def ingest_egest(ctx, ifp = sys.stdin, ofp = sys.stdout):
+  polygons = []
+  polygon = []
+
+  print(ctx["header"], file=ofp)
+
+  line_no=0
+  #for line in sys.stdin:
+  for line in ifp:
+    line = line.strip()
+    line_no += 1
+
+    if (len(line)==0) or (line == ""):
+      if len(polygon)>0:
+        polygons.append(polygon)
+      polygon = []
+      continue
+
+    if line[0]=='#': continue
+
+    r = re.split(r'\s+', line)
+
+    if len(r)!=2:
+      print("Error on line " + str(line_no) + ": number of arguments is not 2 (" + line + ")", file=sys.stderr)
+      sys.exit(1)
+
+    try:
+      x = float(r[0]) * ctx["premul"]
+      y = float(r[1]) * ctx["premul"]
+    except Exception, e:
+      print(e, file=sys.stderr)
+      sys.exit(1)
+
+    polygon.append([x,y])
+
+  if len(polygon)>0:
+    polygons.append(polygon)
+
+  if ctx["sort"]:
+    polygons_sort(polygons)
+
+  for p in polygons:
+    if len(p)==0: continue
+
+    x0 = p[0][0]
+    y0 = p[0][1]
+
+    print("G0", "X" + "{:.10f}".format(x0), "Y" + "{:.10f}".format(y0), ctx["g0speed"], file=ofp)
+
+    nstep=1
+    if ctx["z_active"]:
+      print("G0", "Z" + "{:.10f}".format(ctx["z_height"]), ctx["z_rapid"], file=ofp)
+      nstep = int(math.ceil(( abs(ctx["z_plunge"] - ctx["z_0"]) )/ctx["z_step"]))
+
+    for s in range(nstep):
+
+      if ctx["z_active"]:
+        zh = ((ctx["z_plunge"] - ctx["z_0"]) * float(s+1)/float(nstep)) + ctx["z_0"]
+        if zh < ctx["z_plunge"]:
+          print(";#(CLAMPING)", file=ofp)
+          zh = ctx["z_plunge"]
+
+        print("G1", "Z" + "{:.10f}".format(zh), ctx["z_slow"], file=ofp)
+
+      for xy in p:
+        x = xy[0]
+        y = xy[1]
+        print("G1", "X" + "{:.10f}".format(x), "Y" + "{:.10f}".format(y), ctx["g1speed"], file=ofp)
+
+      if ctx["close_polygon"]:
+        print("G1", "X" + "{:.10f}".format(x0), "Y" + "{:.10f}".format(y0), ctx["g1speed"], file=ofp)
+
+      print(file=ofp)
+
+    if ctx["z_active"]:
+      print("G0", "Z" + "{:.10f}".format(ctx["z_height"]), ctx["z_rapid"], file=ofp)
+
+  print(ctx["footer"], file=ofp)
+
+## decorate the pgn array of objects with the cross product normal
+## magnitude value 'n'
+##
+def polygon_decorate_n(pgn):
+  if len(pgn) < 3:
+    for idx in range(len(pgn)):
+      pgn[idx]["n"] = 0.0
+    return
+
+  for idx in range(len(pgn)):
+    prv_idx = (idx + len(pgn) - 1) % len(pgn)
+    nxt_idx = (idx + 1) % len(pgn)
+    v0 = { "x": pgn[prv_idx]["x"] - pgn[idx]["x"], "y" : pgn[prv_idx]["y"] - pgn[idx]["y"] }
+    v1 = { "x": pgn[nxt_idx]["x"] - pgn[idx]["x"], "y" : pgn[nxt_idx]["y"] - pgn[idx]["y"] }
+    pgn[idx]["n"] = crossprodmag(v0,v1)
+
+## calculate the 'score' of the tab placed at path s-position 'tab_beg' with
+## tab length 'tab_len'.
+## This is length of each portion the tab falls on the line segment times the
+## magnitude of the normal.
+## Since the left and right segment use the same normal, and the normal is thus
+## multiplied by itself, this score is strictly positive.
+##
+def polygon_curve_score(pgn, tab_beg, tab_len):
+  score = 0.0
+  if len(pgn) < 3: return score
+  for idx in range(len(pgn)):
+
+    prv_idx = (idx + len(pgn) - 1) % len(pgn)
+    nxt_idx = (idx + 1) % len(pgn)
+
+    if (tab_beg + tab_len) < pgn[idx]["s"]: return score
+    if tab_beg > pgn[idx]["s"]: continue
+
+    s0 = abs(max(pgn[prv_idx]["s"], tab_beg) - pgn[idx]["s"])
+    s1 = abs(pgn[idx]["s"] - min(tab_beg + tab_len, pgn[nxt_idx]["s"]))
+
+    score += s0*s1*pgn[idx]["n"]*pgn[idx]["n"]
+
+  return score
+
+
+## insert the tab into the 'pgn' array at s-position 'tab_beg' with
+## 'tab_len'.
+## This does not wrap around from the end to the beginning (though this
+## might be upadted in the future).
+## This constructs a new array and returns it.
+##
+def polygon_insert_tab_at(pgn, tab_beg, tab_len):
+  ret_p = []
+
+  prv_x = 0.0
+  prv_y = 0.0
+  prv_s = 0.0
+
+  for pnt_idx in range(len(pgn)):
+    p = pgn[pnt_idx]
+
+    if pnt_idx==0:
+      prv_x = p["x"]
+      prv_y = p["y"]
+      prv_s = p["s"]
+
+    # take care of pathological case when line segment is 0 length
+    #
+    r = math.sqrt((prv_x - p["x"])*(prv_x - p["x"]) + (prv_y - p["y"])*(prv_y - p["y"]))
+    if abs(r) < ctx["epsilon"]:
+      prv_x = p["x"]
+      prv_y = p["y"]
+      prv_s = p["s"]
+      r = 1.0
+
+    # If the tab is completel to the 'left' of the current vertex, we can insert it
+    # completely without needing to split the tab into segements.
+    # Do so, making sure \to insert an extra 'down' entry so that if we are right
+    # next to another tab in the list, we'll properly render the outline.
+    #
+    if (tab_beg <= p["s"]) and ((tab_beg + tab_len) < p["s"]):
+      ds = tab_beg - prv_s
+      x = (ds * (p["x"] - prv_x) / r) + prv_x
+      y = (ds * (p["y"] - prv_y) / r) + prv_y
+      ret_p.append( {"x": x, "y": y, "s": tab_beg, "t": "t", "n":0.0 } )
+
+      ds = tab_beg + tab_len - prv_s
+      x = (ds * (p["x"] - prv_x) / r) + prv_x
+      y = (ds * (p["y"] - prv_y) / r) + prv_y
+      ret_p.append( {"x": x, "y": y, "s": tab_beg + tab_len, "t": "t", "n":0.0 } )
+
+      ret_p.append( {"x": x, "y": y, "s": tab_beg + tab_len, "t": ".", "n":0.0 } )
+
+      ret_p += pgn[pnt_idx:]
+      return ret_p
+
+    pnt_type = p["t"]
+
+    # The tab is split across the current vertex and entries to the right.
+    # Shave off the head of the tab, add/modify the entries to create a 'tab'
+    # entry in the 'pgn' list.
+    #
+    if (tab_beg <= p["s"]) and ((tab_beg + tab_len) > p["s"]):
+      ds = tab_beg - prv_s
+      x = (ds * (p["x"] - prv_x) / r) + prv_x
+      y = (ds * (p["y"] - prv_y) / r) + prv_y
+      ret_p.append( {"x": x, "y": y, "s": tab_beg, "t": "t", "n": 0.0 } )
+
+      pnt_type = "t"
+
+      tab_len -= (p["s"] - tab_beg)
+      tab_beg = p["s"]
+
+    ret_p.append( { "x" : p["x"], "y": p["y"], "s": p["s"], "t": pnt_type, "n": 0.0 })
+
+    prv_x = p["x"]
+    prv_y = p["y"]
+    prv_s = p["s"]
+
+  return ret_p
+
+
+## Process polygon and insert tabs.
+##
+def ingest_egest_with_tabs(ctx, ifp = sys.stdin, ofp = sys.stdout):
+  polygons = []
+  polygon = []
+
+  print(ctx["header"], file=ofp)
+
+  firstPoint = True
+  prev_x = 0.0
+  prev_y = 0.0
+
+  line_no=0
+  for line in ifp:
+    line = line.strip()
+    line_no += 1
+
+    if (len(line)==0) or (line == ""):
+      if len(polygon)>0:
+        polygons.append(polygon)
+      polygon = []
+      firstPoint = True
+      continue
+
+    if line[0]=='#': continue
+
+    r = re.split(r'\s+', line)
+
+    if len(r)!=2:
+      print("Error on line " + str(line_no) + ": number of arguments is not 2 (" + line + ")", file=sys.stderr)
+      sys.exit(1)
+
+    try:
+      x = float(r[0]) * ctx["premul"]
+      y = float(r[1]) * ctx["premul"]
+    except Exception, e:
+      print(e, file=sys.stderr)
+      sys.exit(1)
+
+    # record lenght of outline as we go
+    #
+    s = 0.0
+    if not firstPoint:
+      ds = math.sqrt( (prev_x - x)*(prev_x - x) + (prev_y - y)*(prev_y - y) )
+      s = polygon[ len(polygon) - 1 ]["s"] + ds
+
+    prev_x = x
+    prev_y = y
+
+    # '.' type ("T" field) represent simple contour whereas 't' type
+    # represents tabs. Though space iniefficient, it's easier
+    # to decorate entries with modifiers like this than do it a more
+    # complicated but efficietn way.
+    #
+    polygon.append({ "x":x, "y":y, "s": s, "t": ".", "n":0.0 })
+    firstPoint = False
+
+  if len(polygon)!=0:
+    polygons.append(polygon)
+
+  if ctx["sort"]:
+    polygons_sort(polygons)
+
+
+
+  # decorate with 'n' cross product magnitude value for
+  # score tab positioning heuristic.
+  #
+  for pgn_idx in range(len(polygons)):
+    pgn = polygons[pgn_idx]
+    if len(pgn)<3:
+      for idx in range(len(pgn)):
+        pgn[idx]["n"] = 0.0
+      continue
+
+    for idx in range(len(pgn)):
+      prv_idx = (idx + len(pgn) - 1) % len(pgn)
+      nxt_idx = (idx + 1) % len(pgn)
+      v0 = { "x": pgn[prv_idx]["x"] - pgn[idx]["x"], "y" : pgn[prv_idx]["y"] - pgn[idx]["y"] }
+      v1 = { "x": pgn[nxt_idx]["x"] - pgn[idx]["x"], "y" : pgn[nxt_idx]["y"] - pgn[idx]["y"] }
+      pgn[idx]["n"] = crossprodmag( v0, v1 )
+
+  _zheight = ctx["z_height"]
+  _zplunge = ctx["z_plunge"]
+  _zzero = ctx["z_0"]
+  _zstep = ctx["z_step"]
+  _g0speed = ctx["g0speed"]
+  _g1speed = ctx["g1speed"]
+
+  _tabheight = ctx["tab_height"]
+  _ztabstart = _zplunge + _tabheight
+
+  _tablen = ctx["tab_length"]
+  _ntab = ctx["tab_n"]
+
+  # a bit inefficient but construct tabs
+  #
+  for pidx in range(len(polygons)):
+    p = polygons[pidx]
+    if len(p)==0: continue
+
+    polygon_decorate_n(polygons[pidx])
+
+    clen = p[ len(p) - 1 ]["s"]
+
+    s_window_len = (clen / (float(_ntab))) - _tablen
+
+    if _tablen <= 0.0: continue
+    if clen < (float(_ntab) * _tablen): continue
+    for tabidx in range(_ntab):
+
+      tab_s_offset = float(tabidx) * clen / float(_ntab)
+
+      # this heuristic, for simplicity, only uses two scores, one at the original
+      # offset and another at some distance away that doesn't overlap with the
+      # other tab, to determine where the tab should be positioned.
+      #
+      n_tab_sample = 4
+      score, min_score, min_idx = [], 0, 0
+      for idx in range(n_tab_sample):
+        tab_shift = float(idx) * s_window_len / float(n_tab_sample)
+        score.append( polygon_curve_score(polygons[pidx], tab_s_offset + tab_shift , _tablen) )
+        #print("#", tab_s_offset + tab_shift, score[idx])
+        if idx==0:
+          min_score = score[0]
+          min_idx = 0
+        elif min_score > score[idx]:
+          min_score = score[idx]
+          min_idx = idx
+      #print("## min_score", min_score, ", min_idx", min_idx)
+
+      tab_shift = float(min_idx) * s_window_len / float(n_tab_sample)
+      polygons[pidx] = polygon_insert_tab_at(polygons[pidx], tab_s_offset + tab_shift, _tablen)
+
+      #if score0 == min(score0, score1, score2):
+      #  polygons[pidx] = polygon_insert_tab_at(polygons[pidx], tab_s_offset, _tablen)
+      #elif score1 == min(score0, score1, score2):
+      #  polygons[pidx] = polygon_insert_tab_at(polygons[pidx], tab_s_offset + s_window_len/2, _tablen)
+      #else:
+      #  polygons[pidx] = polygon_insert_tab_at(polygons[pidx], tab_s_offset + s_window_len, _tablen)
+
+    #print_polygon_debug(polygons[pidx])
+
+  for p in polygons:
+    if len(p)==0: continue
+
+    x0 = p[0]["x"]
+    y0 = p[0]["y"]
+
+    print("G0", "X" + "{:.10f}".format(x0), "Y" + "{:.10f}".format(y0), _g0speed, file=ofp)
+
+    nstep=1
+    if ctx["z_active"]:
+      print("G0", "Z" + "{:.10f}".format(_zheight), _g0speed, file=ofp)
+      nstep = int(abs(math.ceil((_zplunge - _zzero)/_zstep)))
+
+    prev_entry_type = "."
+
+    for s in range(nstep):
+
+      if ctx["z_active"]:
+        zh = ((_zplunge - _zzero) * float(s+1)/float(nstep)) + _zzero
+        if zh < _zplunge:
+          zh = _zplunge
+
+        #if (zh < _ztabstart) and (prev_entry_type == ".") and (xy["t"] == "t"):
+        #    #print(";# up!", file=ofp)
+        #    print("G1", "Z" + "{:.10f}".format(_ztabstart), _g1speed, file=ofp)
+        #else:
+        #  print("G1", "Z" + "{:.10f}".format(zh), _g1speed, file=ofp)
+
+      firstIter = True
+
+      for xy in p:
+
+        if firstIter:
+          if (zh < _ztabstart) and (prev_entry_type == ".") and (xy["t"] == "t"):
+              #print(";# up!", file=ofp)
+              print("G1", "Z" + "{:.10f}".format(_ztabstart), _g1speed, file=ofp)
+          else:
+            print("G1", "Z" + "{:.10f}".format(zh), _g1speed, file=ofp)
+        firstIter = False
+
+
+
+        if ctx["z_active"] and (zh < _ztabstart):
+          if (prev_entry_type == "t") and (xy["t"] == "."):
+
+            #print(";# down!", file=ofp)
+            print("G1", "Z" + "{:.10f}".format(zh), _g1speed, file=ofp)
+
+        x = xy["x"]
+        y = xy["y"]
+        print("G1", "X" + "{:.10f}".format(x), "Y" + "{:.10f}".format(y), _g1speed, file=ofp)
+
+        if ctx["z_active"]:
+          if zh < _ztabstart:
+            if (prev_entry_type == ".") and (xy["t"] == "t"):
+              #print(";# up!", file=ofp)
+              print("G1", "Z" + "{:.10f}".format(_ztabstart), _g1speed, file=ofp)
+
+        prev_entry_type = xy["t"]
+
+      #if ctx["z_active"]:
+      if ctx["close_polygon"]:
+        print("G1", "X" + "{:.10f}".format(x0), "Y" + "{:.10f}".format(y0), _g1speed, file=ofp)
+
+      print(file=ofp)
+
+    print("G0", "Z" + "{:.10f}".format(_zheight), _g0speed, file=ofp)
+
+  print(ctx["footer"], file=ofp)
+
+
+def main(argv):
+  global ctx
+  ifn, ofn = "-", "-"
+  ifp, ofp = sys.stdin, sys.stdout
+
+  long_opt_list = [ "help", "preset=", "show-context", "z", "explicit-speed", "premul=", "epsilon=", "header=", "footer=", "rapid=", "slow=",
+                    "z-rapid=", "z-slow=", "z-step=", "z-raise=", "z-plunge=",
+                    "tab", "tab-n=", "tab-length=", "tab-height=", "notab",
+                    "close-polygon", "open-polygon",
+                    "sort"]
+
+  try:
+    #opts,args = getopt.getopt(argv,"hi:o:",["sfx-final=", "pfx=", "sfx-rapid=","sfx-slow=", "premul=", "z-step", "z-raise", "z-plunge"])
+    opts,args = getopt.getopt(argv,"hi:o:",long_opt_list)
+  except getopt.GetoptError:
+    usage()
+    sys.exit(2)
+
+  if len(args) >= 1:
+    ifn = args[0]
+    if len(args) >= 2:
+      ofn = args[1]
+
+  for opt, arg in opts:
+    if opt == "--preset":
+      if arg.lower() in ("maslow", "maslowcnc"):
+        ctx = ctx_maslow
+      elif arg.lower() in ("laser"):
+        ctx = ctx_laser
+      else:
+        print("WARNING: no preset found, using default", file=sys.stderr)
+
+  show_context = False
+
+  for opt, arg in opts:
+
+    if opt in ("-h", "--help"):
+      usage()
+      sys.exit()
+    elif opt in ("--show-context"): show_context = True
+
+    elif opt in ("-i", "--ifile"): ifn = arg
+    elif opt in ("-o", "--ofile"): ofn = arg
+
+    elif opt in ("--premul"): ctx["premul"] = float(arg)
+
+    elif opt in ("--rapid"):
+      ctx["g0speed"] = arg
+      ctx["explicit_speed"] = True
+    elif opt in ("--slow"):
+      ctx["g1speed"] = arg
+      ctx["explicit_speed"] = True
+    elif opt in ("--explicit-speed"): ctx["explicit_speed"] = True
+
+    elif opt in ("--header"):     ctx["header"] = arg.decode('unicode_escape')
+    elif opt in ("--footer"):  ctx["footer"] = arg.decode('unicode_escape')
+
+    elif opt in ("--close-polygon"): ctx["close_polygon"] = True
+    elif opt in ("--open-polygon"): ctx["close_polygon"] = False
+
+    elif opt in ("--z"):        ctx["z_active"] = True
+    elif opt in ("--z-slow"):   ctx["z_slow"] = float(arg)
+    elif opt in ("--z-rapid"):  ctx["z_rapid"] = float(arg)
+    elif opt in ("--z-step"):   ctx["z_step"] = float(arg)
+    elif opt in ("--z-raise"):  ctx["z_height"] = float(arg)
+    elif opt in ("--z-plunge"):
+      ctx["z_active"] = True
+      ctx["z_plunge"] = float(arg)
+
+    elif opt in ("--notab"):  ctx["tab_n"] = 0
+    elif opt in ("--tab"):    ctx["tab_n"] = ctx["tab_default_n"]
+    elif opt in ("--tab-n"):  ctx["tab_n"] = int(arg)
+    elif opt in ("--tab-length"): ctx["tab_length"] = float(arg)
+    elif opt in ("--tab-height"): ctx["tab_height"] = float(arg)
+
+    elif opt in ("--sort"): ctx["sort"] = True
+
+  if show_context:
+    print(json.dumps(ctx, indent=2))
+    sys.exit(0)
+
+  if ifn != "-": ifp = open(ifn,"r")
+  if ofn != "-": ofp = open(ofn, "w")
+
+  if ctx["tab_n"] > 0 : ingest_egest_with_tabs(ctx, ifp, ofp)
+  else:                 ingest_egest(ctx, ifp, ofp)
+
+  if ifp!=sys.stdin:  ifp.close()
+  if ofp!=sys.stdout: ofp.close()
+
+if __name__ == "__main__":
+  main(sys.argv[1:])

experiment/pcb/export/gpmat

@@ -0,0 +1,60 @@
+#!/usr/bin/python
+
+import math
+import sys
+import os
+
+
+u0 = 1.0
+u1 = 0.0
+u2 = 0.0
+u3 = 1.0
+u4 = 0.0
+u5 = 0.0
+
+if len(sys.argv)>1:
+  if (sys.argv[1] == "-h"):
+    print "\nusage:\n\n  gpmat u0 u1 u2 u3 [u4] [u5]\n\n"
+    print "  | u0 u2 u4 |"
+    print "  | u1 u3 u5 |"
+    print "  | 0  0  1  |"
+    print "\n"
+    sys.exit(0)
+  u0 = float(sys.argv[1])
+  if len(sys.argv)>2:
+    u1 = float(sys.argv[2])
+    if len(sys.argv)>3:
+      u2 = float(sys.argv[3])
+      if len(sys.argv)>4:
+        u3 = float(sys.argv[4])
+        if len(sys.argv)>5:
+          u4 = float(sys.argv[5])
+          if len(sys.argv)>6:
+            u5 = float(sys.argv[6])
+
+mat = [ [ u0, u2, u4], [ u1, u3, u5 ], [0.0, 0.0, 1.0]  ]
+
+for line in sys.stdin:
+  line = line.strip()
+  if len(line)==0:
+    print ""
+    continue
+  if line[0] == '#':
+    print line
+    continue
+
+  xy = line.split(" ")
+  x = float(xy[0])
+  y = float(xy[1])
+  z = 1.0
+
+  #print xy, x, y, z, u0, u1, u2, u3, u4, u5
+
+  tx = x*u0 + y*u2 + z*u4
+  ty = x*u1 + y*u3 + z*u5
+
+  print tx, ty
+
+
+
+

experiment/pcb/export/ngc_bounds

@@ -0,0 +1,113 @@
+#!/usr/bin/perl
+#
+
+use strict;
+
+my $fn = ($ARGV[0] || die "provide gcode file");
+die "invalid file: $fn" if (!-e $fn);
+
+# default to mm
+my $is_mm = 1;
+
+my $have_x = 0;
+my $have_y = 0;
+my $have_z = 1;
+
+my $x_min_mm;
+my $x_max_mm;
+
+my $y_min_mm;
+my $y_max_mm;
+
+my $z_min_mm = 0;
+my $z_max_mm = 0;
+
+
+open FIL, $fn;
+while (<FIL>)
+{
+  my $l = $_;
+
+  $l =~ s/;.*//;
+  $l =~ s/\([^)]*\)//g;
+
+  my $g_line = $l;
+  while ($g_line =~ /[gG]\s*2([01])/)
+  {
+    my $zo = $1;
+    $is_mm = 0 if ($zo eq "0");
+    $is_mm = 1 if ($zo eq "1");
+    $g_line = substr $g_line, (@+[0]);
+  }
+
+  while ($g_line =~ /[xX]\s*(-?\d+(\.\d+)?|-?\.\d+)/)
+  {
+    my $x = $1;
+    my $x_mm = ( $is_mm ? $x : ($x * 25.4) );
+    if (!$have_x)
+    {
+      $x_min_mm = $x_mm;
+      $x_max_mm = $x_min_mm;
+      $have_x = 1;
+    }
+    else
+    {
+      $x_min_mm = $x_mm if ($x_min_mm > $x_mm);
+      $x_max_mm = $x_mm if ($x_max_mm < $x_mm);
+    }
+    $g_line = substr $g_line, (@+[0]);
+  }
+
+  $g_line = $l;
+  while ($g_line =~ /[yY]\s*(-?\d+(\.\d+)?|-?\.\d+)/)
+  {
+    my $y = $1;
+    my $y_mm = ( $is_mm ? $y : ($y * 25.4) );
+    if (!$have_y)
+    {
+      $y_min_mm = $y_mm;
+      $y_max_mm = $y_min_mm;
+      $have_y = 1;
+    }
+    else
+    {
+      $y_min_mm = $y_mm if ($y_min_mm > $y_mm);
+      $y_max_mm = $y_mm if ($y_max_mm < $y_mm);
+    }
+    $g_line = substr $g_line, (@+[0]);
+  }
+
+  my $g_line = $l;
+  while ($g_line =~ /[zZ]\s*(-?\d+(\.\d+)?|-?\.\d+)/)
+  {
+    my $z = $1;
+    my $z_mm = ( $is_mm ? $z : ($z * 25.4) );
+    if (!$have_z)
+    {
+      $z_min_mm = $z_mm;
+      $z_max_mm = $z_min_mm;
+      $have_z = 1;
+    }
+    else
+    {
+      $z_min_mm = $z_mm if ($z_min_mm > $z_mm);
+      $z_max_mm = $z_mm if ($z_max_mm < $z_mm);
+    }
+    $g_line = substr $g_line, (@+[0]);
+  }
+
+}
+close FIL;
+
+die "don't have all of x, y, z co-ords" if ( not $have_x or not $have_y or not $have_z );
+
+print "min_x: ", $x_min_mm, " mm, ", ($x_min_mm/25.4), " inch\n";
+print "max_x: ", $x_max_mm, " mm, ", ($x_max_mm/25.4), " inch\n";
+
+print "min_y: ", $y_min_mm, " mm, ", ($y_min_mm/25.4), " inch\n";
+print "max_y: ", $y_max_mm, " mm, ", ($y_max_mm/25.4), " inch\n";
+
+print "min_z: ", $z_min_mm, " mm, ", ($z_min_mm/25.4), " inch\n";
+print "max_z: ", $z_max_mm, " mm, ", ($z_max_mm/25.4), " inch\n";
+
+

experiment/pcb/export/xj

@@ -0,0 +1,20 @@
+#!/usr/bin/python
+
+import xmljson
+from xmljson import badgerfish as bf
+from xml.etree.ElementTree import fromstring
+import json
+import sys
+import os
+
+if (len(sys.argv) < 2):
+  print "provide file"
+  sys.exit(-1)
+
+with open(sys.argv[1]) as fp:
+  dat = fp.read()
+
+
+  print json.dumps( bf.data(fromstring(dat)) )
+
+

experiment/pcb/power-conn-pcb.svg

@@ -0,0 +1,303 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="210mm"
+   height="297mm"
+   viewBox="0 0 210 297"
+   version="1.1"
+   id="svg1478"
+   inkscape:version="0.92.4 (unknown)"
+   sodipodi:docname="power-conn-pcb.svg">
+  <defs
+     id="defs1472" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="2.8"
+     inkscape:cx="91.130716"
+     inkscape:cy="1027.6722"
+     inkscape:document-units="mm"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:window-width="1278"
+     inkscape:window-height="742"
+     inkscape:window-x="2150"
+     inkscape:window-y="84"
+     inkscape:window-maximized="0" />
+  <metadata
+     id="metadata1475">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1">
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+       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.30000001;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
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+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="caac" />
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