From 145a576d570f319e3e17980808124c2c36326df8 Mon Sep 17 00:00:00 2001
From: Grace Copplestone <grace.copplestone@cba.mit.edu>
Date: Wed, 1 Nov 2017 16:02:51 -0400
Subject: [PATCH] Add new file
---
eagle/eagle_png.py | 185 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 185 insertions(+)
create mode 100644 eagle/eagle_png.py
diff --git a/eagle/eagle_png.py b/eagle/eagle_png.py
new file mode 100644
index 0000000..3534fe3
--- /dev/null
+++ b/eagle/eagle_png.py
@@ -0,0 +1,185 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import platform
+import glob
+import subprocess
+import hashlib
+
+def find_eagle():
+ if platform.uname()[0] == 'Darwin':
+ try:
+ eagle_dir = glob.glob('/Applications/EAGLE*')[-1]
+ except IndexError:
+ sys.stderr.write("Error: EAGLE not found.\n")
+ sys.exit(1)
+
+ return eagle_dir + '/EAGLE.app/Contents/MacOS/EAGLE'
+ else:
+ if subprocess.call(['which','eagle'],
+ stdout = open(os.devnull, 'w')):
+ sys.stderr.write("Error: EAGLE not found.\n")
+ sys.exit(1)
+ return 'eagle'
+
+def create_images(name, resolution = 1500):
+ for img in ['top','bottom','cutout','holes','vias']:
+ file = '%s.%s.png' % (name, img)
+ if os.path.isfile(file):
+ os.remove(file)
+
+ script = '''
+ratsnest; write;
+set palette black; window;
+display none top vias pads;
+export image '{name}.top.png' monochrome {resolution};
+display none bottom vias pads;
+export image '{name}.bottom.png' monochrome {resolution};
+display none milling;
+export image '{name}.cutout.png' monochrome {resolution};
+display none holes;
+export image '{name}.holes.png' monochrome {resolution};
+display none vias pads;
+export image '{name}.vias.png' monochrome {resolution};
+quit'''.format(name = name, resolution = resolution)
+ subprocess.call([find_eagle(), '-C', script, name + '.brd'])
+
+def md5(filename):
+ with open(filename,'rb') as f:
+ m = hashlib.md5()
+ for chunk in iter(lambda: f.read(m.block_size*128), ''):
+ m.update(chunk)
+ return m.digest()
+
+def clean_up(name):
+ preserve = ['top','bottom','cutout']
+ for img in ['top','bottom','cutout','holes','vias']:
+ file = '%s.%s.png' % (name, img)
+ file_ = '%s.%s_.png' % (name, img)
+ if os.path.isfile(file) and img not in preserve:
+ os.remove(file)
+ if os.path.isfile(file_):
+ os.remove(file_)
+
+def print_help():
+ print """command line: eagle_png [options] target.brd
+ target.brd = EAGLE brd file to render
+ The board outline should be a solid polygon on the 'milling' layer
+ Internal cutouts should be solid shapes on the 'holes' layer
+
+ Valid options:
+ --resolution NUM : sets output image resolution
+ --doublesided : forces double-sided mode"""
+ sys.exit(1)
+
+if __name__ == '__main__':
+ if len(sys.argv) == 1:
+ print_help()
+ sys.exit(1)
+
+ # Parse arguments
+ sys.argv = sys.argv[1:]
+ resolution = 1500
+ force_doublesided = False
+
+ while sys.argv:
+ if sys.argv[0] == '--resolution':
+ try:
+ resolution = sys.argv[1]
+ sys.argv = sys.argv[2:]
+ except IndexError:
+ sys.stderr.write("Error: No resolution provided.\n")
+ sys.exit(1)
+ try:
+ resolution = int(resolution)
+ except ValueError:
+ sys.stderr.write("Error: Invalid resolution.\n")
+ sys.exit(1)
+
+ elif sys.argv[0] == '--doublesided':
+ force_doublesided = True
+ sys.argv = sys.argv[1:]
+
+ elif len(sys.argv) == 1:
+ break
+ else:
+ sys.stderr.write("Error: No filename provided.\n")
+ sys.exit(1)
+
+ name = sys.argv[0].replace('.brd','')
+ if not os.path.isfile(name+'.brd'):
+ sys.stderr.write("Error: .brd file does not exist.\n")
+ sys.exit(1)
+
+ vias = name + '.vias.png'
+ cutout = name + '.cutout.png'
+ top = name + '.top.png'
+ bottom = name + '.bottom.png'
+ holes = name + '.holes.png'
+
+ print "Rendering images."
+ create_images(name, resolution)
+
+ # Check to make sure that imagemagick is installed.
+ if subprocess.call(['which','convert'], stdout = open(os.devnull, 'w')):
+ sys.stderr.write("""Error: 'convert' not found.
+ImageMagick command-line tools must be installed to use eagle_png.""")
+ sys.exit(1)
+
+ print "Processing images."
+
+ # The following command is a set of ImageMagick instructions that
+ # combine all of the images.
+
+ # The following steps take place:
+ # - Perform a white flood fill on the vias image, starting in the upper
+ # left corner. This makes the via image a set of black holes on
+ # a uniform white background
+ # - Multiply the vias and cutout images, to cut the via holes from
+ # the cutout region.
+ # - Invert the cutout image.
+ # - Lighten the top and bottom traces with the inverted cutout. This
+ # ensures that we don't waste time milling traces in regions that
+ # will be cut out of the PCB.
+ # - Subtract the holes image from the original cutout image
+ # - Save this combined cutout image
+
+ command = [ 'convert',
+ vias, '-fill', 'white', '-draw', 'color 0,0 floodfill',
+ cutout, '-compose', 'Darken', '-composite',
+ '-compose','Lighten',
+ '(',
+ '+clone',
+ '-negate'
+ ]
+
+ # If this is a two-sided board, then process the bottom layer
+ if md5(bottom) != md5(vias) or force_doublesided:
+ command += [
+ '(',
+ '+clone', bottom, '-composite',
+ '-flop', '-write', bottom, '+delete',
+ ')'
+ ]
+ else:
+ os.remove(bottom)
+
+ # Process the top layer
+ command += [
+ top, '-composite', '-write', top,
+ '+delete',
+ ')',
+ holes, '-compose', 'Minus_Src', '-composite', cutout
+ ]
+
+ # Execute this whole mess
+ subprocess.call(command)
+
+ os.remove(vias)
+ os.remove(holes)
+
+ if bottom in command:
+ print "Generated %s, %s, %s." % (top, bottom, cutout)
+ else:
+ print "Generated %s, %s." % (top, cutout)
--
GitLab