upload dxf processing code

.gitignore

+**test
\ No newline at end of file

README.md

@@ -28,10 +28,11 @@
     - Cut and etching from same `Inkscape` file
 
 ###  06/28/2019 (Fri)
-
+##### Connection and fabrication approach confirmed !
 - Confirm that copper tape has better conductivity than aluminum sheet when attaching microcontroller pins through `H-shape` cut
   - Copper tape is harder to be scratched, which provides less risk of disconnection during assessmbly.
-
+- Etching on copper type isolates connections
+  
 - Research on PCB editor
   - EAGLE
     - EAGLE cannot import `.pcb` file
@@ -51,13 +52,13 @@
 
 
 - Approaches:
-  - `A`. convert SVG/DXF file to schematic/board design of PCB.  Use KiCAD or EAGLE to do autorouting.
+  - `A`. convert SVG/DXF file to schematic/board design of PCB.  Use KiCAD or EAGLE to do auto routing.
   - `B`. develop algorithm on auto routing for single layer svg/dxf file. (path finding problem)
  
  
 ##### Approach `A`
--  Use regular shape board for PCB in KiCAD
-   - image processing: divide alternative shape of `paperbot` to multiple rectangles (openCv)
+-  Use regular shape board for PCB in EAGLE/KiCAD
+   - image processing: divide alternative shape of `paperbot` to multiple rectangles (openCV)
    
    - Pull required connections and place additional header pins around edges of each rectangle
 
@@ -68,15 +69,39 @@
   - Schematic design helps with router to know desired connection
   - Additional header pins at each side of kink mark
 
-### 06/28/2019 (Sat)
+### 06/29 & 06/30/2019 (Sat & Sun)
 ##### Approach `B`
 - Potential needed functions of packages
   
-  - A package enable drawing through scripts on SVG/DXF file
+  - A package draws on DXF file through script
   - A script that pulls out pins' coordinate on paper chassis
-  - Or a image process package (OpenCV) that reads pins' coordinate on paper chassis
-  - A package solves multi-node path finding problem
-  
+    - Or a image process package (OpenCV) that reads pins' coordinate on paper chassis
+  - A package solves multi-node path finding problem*
+
+##### Record of Research  
 - Python Pathfinding package:
   - [pathfinding](https://pypi.org/project/pathfinding/#description)
-  
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+- Python DXF editor:
+  - [ezdxf](https://pypi.org/project/ezdxf/)
+  - [dxfgrabber](https://pypi.org/project/dxfgrabber/)
+    - `Note`: able to grab simple geometry from file 
+  - [sdxf](http://www.kellbot.com/sdxf-python-library-for-dxf/)
+- Going through tutorials of `ezdxf`
+  - All lines on paper space`layer0`
+
+### 07/01/2019 (Mon)
+- Continue dxf processing with `'graph-silhouette.dxf'`
+##### Record of tips:
+  -  Put circuit design on a new layer of dxf drawing
+     -  [check doc about layers here](https://ezdxf.readthedocs.io/en/latest/tutorials/layers.html)
+  - Use block feature to draw similar pattern
+    - [check doc about block here](https://ezdxf.readthedocs.io/en/latest/tutorials/blocks.html)
+  - Blocks are `symbol` in Inkscape. Convert `symbol` to `path`
+    -  Edit > Clone > Unlink Clone (Shift+Alt+D), and you have a group, ungroup (Object > Ungroup, or Shift+Ctrl+G) and edit
+  - Convert `text` to `path`
+    - Path combine (Ctrl+K)
+
+- Test fabrication with different drawing settings
+  - Layers can be cut separately but toggling visibility
+  - Set cuts with same `intensity` and `feedrate` on same layer
+  - Entities' layer can be changed through `Entity.dxf.layer`
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analyze_dxf.py

+#!/usr/bin/env python
+
+import numpy as np
+import ezdxf 
+import random
+
+# class dxf_editor:
+#     def __init__(self,path,dxf_file):
+#         self.dwg=ezdxf.readfile(path+dxf_file)
+
+
+# def main():
+#     path='/home/jingyan/Documents/summer_intern_lemur/roco_electrical/'
+#     dxf_file='graph-silhouette.dxf'
+#     edit=dxf_editor(path,dxf_file)
+    
+
+# if __name__ == '__main__':
+#     main()
+
+path='/home/jingyan/Documents/summer_intern_lemur/roco_electrical/'
+dxf_file='graph-silhouette.dxf'
+dwg=ezdxf.readfile(path+dxf_file)
+# iterate over all entities in model space
+def print_entity(e):
+    print("LINE on layer: %s\n" % e.dxf.layer)
+    print("start point:",e.dxf.start)
+    print("end point:" , e.dxf.end)
+    print("color:", e.dxf.color)
+msp = dwg.modelspace()
+# for e in msp:
+#     if e.dxftype() == 'LINE':
+#         print_entity(e)
+i=0
+# entity query for all LINE entities in model space
+for e in msp.query('LINE[color==1]'):
+    i+=1
+    print_entity(e)
+
+print(i)
+# for z in msp.query('CIRCLE'):
+#     print(z)
+if not 'Isolation' in dwg.layers:
+    dwg.layers.new(name='Isolation',dxfattribs={'linetype':'DASHED','color':2})
+
+msp.add_line((0,0),(50,50),dxfattribs={'layer':'Isolation'})
+
+
+def get_random_point():
+    """Creates random x, y coordinates."""
+    x = random.randint(-100, 100)
+    y = random.randint(-100, 100)
+    return x, y
+
+# Create a block with the name 'FLAG'
+flag = dwg.blocks.new(name='FLAG')
+
+# Add DXF entities to the block 'FLAG'.
+# The default base point (= insertion point) of the block is (0, 0).
+# flag.add_polyline2d([(0, 0), (0, 5), (4, 3), (0, 3)])  # the flag as 2D polyline
+flag.add_circle((0, 0), .4, dxfattribs={'color': 5})  # mark the base point with a circle
+
+msp.add_blockref('FLAG',(40,40))
+
+
+
+dwg.save()
\ No newline at end of file

testline.py

+import ezdxf
+import random  # needed for random placing points
+
+
+def get_random_point():
+    """Creates random x, y coordinates."""
+    x = random.randint(-100, 100)
+    y = random.randint(-100, 100)
+    return x, y
+
+# Create a new drawing in the DXF format of AutoCAD 2010
+dwg = ezdxf.new('ac1024')
+if not 'Isolation' in dwg.layers:
+    dwg.layers.new(name='Isolation',dxfattribs={'color':4})
+# Create a block with the name 'FLAG'
+flag = dwg.blocks.new(name='FLAG')
+
+# Add DXF entities to the block 'FLAG'.
+# The default base point (= insertion point) of the block is (0, 0).
+# flag.add_polyline2d([(0, 0), (0, 5)])  # the flag as 2D polyline
+flag.add_circle((0, 0), 5, dxfattribs={'color': 5})  # mark the base point with a circle
+# flag.add_text("TEST").set_pos((25,280),align="MIDDLE_RIGHT")
+# Get the modelspace of the drawing.
+modelspace = dwg.modelspace()
+
+# Get 50 random placing points.
+placing_points = [get_random_point() for _ in range(50)]
+
+random_scale = 0.5 + random.random() * 2.0
+# Add a block reference to the block named 'FLAG' at the coordinates 'point'.
+modelspace.add_blockref('FLAG', (15,290), dxfattribs={
+    'layer':'Isolation',
+})
+
+modelspace.add_blockref('FLAG',(8,290))
+modelspace.add_text("TEST").set_pos((10,285),align="MIDDLE_RIGHT")
+
+
+for e in modelspace.query('*[layer=="Isolation"]'):
+    pass
+# Save the drawing.
+dwg.saveas("testline.dxf")
\ No newline at end of file

testline.svg

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+<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:xlink="http://www.w3.org/1999/xlink"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="793.700787402"
+   height="1122.51968504"
+   version="1.1"
+   id="svg43"
+   sodipodi:docname="testline.svg"
+   inkscape:version="0.92.4 (unknown)">
+  <metadata
+     id="metadata47">
+    <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>
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="640"
+     inkscape:window-height="480"
+     id="namedview45"
+     showgrid="false"
+     inkscape:zoom="1.6819305"
+     inkscape:cx="68.223504"
+     inkscape:cy="1106.5586"
+     inkscape:window-x="0"
+     inkscape:window-y="27"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="g33" />
+  <desc
+     id="desc2">/home/jingyan/Documents/summer_intern_lemur/roco_electrical/testline.dxf - scale = 1.000000, origin = (0.000000, 0.000000), method = manual</desc>
+  <defs
+     id="defs29">
+    <marker
+       id="DistanceX"
+       orient="auto"
+       refX="0.0"
+       refY="0.0"
+       style="overflow:visible">
+      <path
+         d="M 3,-3 L -3,3 M 0,-5 L  0,5"
+         style="stroke:#000000; stroke-width:0.5"
+         id="path4" />
+    </marker>
+    <pattern
+       height="8"
+       id="Hatch"
+       patternUnits="userSpaceOnUse"
+       width="8"
+       x="0"
+       y="0">
+      <path
+         d="M8 4 l-4,4"
+         linecap="square"
+         stroke="#000000"
+         stroke-width="0.25"
+         id="path7" />
+      <path
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+         linecap="square"
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+         stroke-width="0.25"
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+      <path
+         d="M4 0 l-4,4"
+         linecap="square"
+         stroke="#000000"
+         stroke-width="0.25"
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+    <symbol
+       id="_ArchTick">
+      <path
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+         style="stroke:#000000;fill:none;stroke-linecap: round"
+         id="path14" />
+    </symbol>
+    <symbol
+       id="*Model_Space" />
+    <symbol
+       id="*Paper_Space" />
+    <symbol
+       id="FLAG">
+      <path
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+         style="stroke:#0000FF;fill:none"
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+    </symbol>
+    <symbol
+       id="_Open30">
+      <path
+         d="M -3.779528,1121.506964 0.000000,1122.519685"
+         style="stroke:#000000;fill:none;stroke-linecap: round"
+         id="path22" />
+      <path
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+         style="stroke:#000000;fill:none;stroke-linecap: round"
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+    </symbol>
+  </defs>
+  <g
+     inkscape:groupmode="layer"
+     inkscape:label="0"
+     id="g33">
+    <use
+       transform="translate(26.074335,-1096.6576)"
+       xlink:href="#FLAG"
+       id="use31"
+       style="stroke:#800000"
+       x="0"
+       y="0"
+       width="100%"
+       height="100%" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     inkscape:label="View Port"
+     id="g35" />
+  <g
+     inkscape:groupmode="layer"
+     inkscape:label="Defpoints"
+     id="g37" />
+  <g
+     inkscape:groupmode="layer"
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