include rasterizer

pgmlaser.py

@@ -0,0 +1,81 @@
+#!/usr/bin/python
+
+import itertools
+import PIL.Image as Image
+import sys
+
+FEED_LO = 450
+FEED_HI = 1200
+
+def rasterize_col(pixels, x, y0, dy):
+    st = 0
+    print "G0X%.2f" % x
+    for a, b in itertools.groupby(pixels):
+        b = len(list(b))
+        if a != '\xff':
+            print "M67E0Q0G1Y%.2f" % (y0 + st * dy)
+            st += b
+            o = FEED_LO + (FEED_HI - FEED_LO) * (ord(a)/255.)
+            print "M67E0Q100F%fG1Y%.2f" % (o, y0 + st * dy)
+        else:
+            st += b
+    print "M67E0Q0Z0"
+
+STEPSIZE = 3/160.
+TRAVEL = 36
+
+
+i = Image.open(sys.argv[1])
+i = i.convert("L")  # Force to B&W
+w, h = i.size
+dx = 4*STEPSIZE
+dy = -dx
+x0 = (TRAVEL-dx*w)/2
+y0 = TRAVEL + (dy*h-TRAVEL)/2
+x1 = x0 + w * dx
+y1 = y0 - h * dy
+def tobytes(i):
+    if hasattr(i, 'tobytes'): return i.tobytes()
+    return i.tostring()
+data = tobytes(i)
+
+print >>sys.stderr, len(data), w, h, w*h
+print "G21"
+print "M5"
+print "M68 E0 Q0"
+#print "G0 X0 Y0"
+#print "G0 X%f" % TRAVEL
+#print "G0 Y%f" % TRAVEL
+#print "G0 X0"
+#print "G0 Y0"
+#print "F%d" % FEED
+print "M3"
+for col in range(w):
+    coldata = data[col : : w]
+    #print >>sys.stderr, col, len(coldata)
+    print "(%d)" % col
+    x = x0 + dx * col
+    if col % 2: rasterize_col(coldata[::-1], x, y0, -dy)
+    else:       rasterize_col(coldata,       x, y1,  dy)
+    print
+#    if col % 100 == 99:
+#        print "M68 E0 Q0"
+#        print "G4 P60"
+print "M2"
+
+#    Convert greyscale images to gcode for laser engraving
+#    Copyright 2015  Jeff Epler <jepler@unpythonic.net>
+#
+#    This program is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program; if not, write to the Free Software
+#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA