testing parallel traces

README.md

 ## ENGINEERING JOURNAL
 ### Jingyan Ling
 
+### 08/09/2019
+
+- Potential problem:
+  - drawing pre-processing has two goals: 1. put different intensity cuts on different layers for accurate fabrication 2. make line to 4 nodes path for auto-router treating as obstacles.
+  - Two goal may conflict within single process
+  - potential solution: send 4 nodes path to auto-router and draw wiring paths on drawing with signed layers.
+  
+- Solving parallel traces math computation
+
+### 08/08/2019
+
+- `block` class in `ezdxf` generates symbol in `inkscape`. Check if it can be made to path from script
+- ![](journal_media/cross_cut.png)
+- Changed the way of drawing `cross-cut` to path directly instead of using inserting block class (see [paperbot_draw.py](paperbot_ee_autoroute/paperbot_draw.py) for detail)
+  
+- Parallel traces are not computed correctly
+- ![](journal_media/parallel_trace_error.png)
 ### 08/07/2019
 - Working on drawing details regarding fabrication for electrical design
   - A block was created for 'cross cut' to fit pin insertions

paperbot_ee_autoroute/paperbot_draw.py

@@ -24,6 +24,8 @@ class pre_process():
         self.remove_wheels() ##remove wheel drawings for this design, no need to call for other designs
         self.center_arr=self.find_pin()
         
+        self.cross_cut(2,self.center_arr)
+        
         self.dwg.saveas(self.save_name)
     
     def create_layer(self,layer_name,color):
@@ -71,7 +73,22 @@ class pre_process():
         center_arr=np.unique(center_arr,axis=0)
         center_arr=center_arr[1:]
         return center_arr
-    # def cross_cut_block(self)
+
+    def cross_cut(self,cross_size,pin_loc):
+        """
+        cross_size= lenght of bounding box of the cross cut
+        """
+        tipat=cross_size/2
+        for pt in pin_loc:
+            x=pt[0]
+            y=pt[1]
+            cross_s1=(x-tipat,y-tipat)
+            cross_e1=(x+tipat,y+tipat)
+            cross_s2=(x-tipat,y+tipat)
+            cross_e2=(x+tipat,y-tipat)
+            self.msp.add_line(cross_s1,cross_e1,dxfattribs={'linetype':'DASHDOT', 'layer':'Circuit'})       
+            self.msp.add_line(cross_s2,cross_e2,dxfattribs={'linetype':'DASHDOT', 'layer':'Circuit'})  
+    
     # def line_to_path(self)
 
 
@@ -87,8 +104,9 @@ class post_process():
 
         self.convert_unit()
         self.draw_wires()
+        self.parallel_trace(1)
 
-        self.dwg.save()
+        self.dwg.saveas('route_text.dxf')
 
     def convert_unit(self):
         for path in self._wiring:
@@ -101,4 +119,89 @@ class post_process():
                 self.msp.add_line(path[i],path[i+1],dxfattribs={
                     'layer':'Circuit',
                     'linetype':'DASHDOT'})
-    # def parallel_trace_block(self)
+    def find_lind_eq(self,pt1,pt2):
\ No newline at end of file
+        """
+        input: two points on a line
+        pt1:[x1,y1]
+        pt2:[x2,y2]
+        return: a,b,theta in terms of cy=ax+b
+        """
+        x1,y1=pt1[0],pt1[1]
+        x2,y2=pt2[1],pt2[1]
+
+        if x1==x2:
+            theta=np.pi/2
+            #x= number
+            a=1
+            b=-x1
+            c=0
+        else:
+            theta=np.arctan((y2-y1)/(x2-x1))
+            A=np.array([[x1,1],[x2,1]])
+            k=np.array([y1,y2])
+            sol=np.linalg.solve(A,k)
+            a,b=sol[0],sol[1]
+            c=1
+        return a,b,c,theta
+
+
+    def parallel_trace(self,width):
+        halfw=width/2
+        for path in self.wiring:
+            for i in range(len(path)-1):
+                start_x,start_y=path[i][0],path[i][1]
+                end_x,end_y=path[i+1][0],path[i+1][1]
+                
+                theta=self.find_lind_eq(path[i],path[i+1])[3]
+                sinw=np.sin(theta)*halfw
+                cosw=np.cos(theta)*halfw
+                s1i=[start_x-sinw,start_y+cosw]
+                s1o=[start_x+sinw,start_y-cosw]                
+                e1i=[end_x-sinw,end_y+cosw]
+                e1o=[end_x+sinw,end_y-cosw]
+
+                line1i=self.find_lind_eq(s1i,e1i)
+                line1o=self.find_lind_eq(s1o,e1o)
+
+                if i==0:
+                    s1=s1i
+                    s2=s1o
+                else:
+                    s1=e1
+                    s2=e2 
+                
+                if i<len(path)-2:
+                    next_x,next_y=path[i+2][0],path[i+2][1]
+                    theta2=self.find_lind_eq(path[i+1],path[i+2])[3]
+                   
+                    sinw2=np.sin(theta2)*halfw
+                    cosw2=np.cos(theta2)*halfw
+
+                    s2i=[end_x-sinw2,end_y+cosw2]
+                    s2o=[end_x+sinw2,end_y-cosw2]
+                    e2i=[next_x-sinw2,next_y+cosw2]
+                    e2o=[next_x+sinw2,next_y-cosw2]
+
+                    line2i=self.find_lind_eq(s2i,e2i)
+                    line2o=self.find_lind_eq(s2o,e2o)
+
+                    Ainteri=np.array([[line1i[0],-line1i[2]],[line2i[0],-line2i[2]]])
+                    binteri=np.array([-line1i[1],-line2i[1]])
+                    Aintero=np.array([[line1o[0],-line1o[2]],[line2o[0],-line2o[2]]])
+                    bintero=np.array([-line1o[1],-line2o[1]])
+                    
+                    e1=np.linalg.solve(Ainteri,binteri)
+                    e2=np.linalg.solve(Aintero,bintero)
+
+                else:
+                    #from last end point to this end
+                    e1=[end_x-sinw,end_y+cosw]
+                    e2=[end_x+sinw,end_y-cosw]
+                
+
+                self.msp.add_line(s1,e1,dxfattribs={
+                    'layer':'Circuit',
+                    'linetype':'DASHDOT'})
+                self.msp.add_line(s2,e2,dxfattribs={
+                    'layer':'Circuit',
+                    'linetype':'DASHDOT'})

paperbot_ee_autoroute/paperbot_dsn.py

@@ -35,10 +35,10 @@ class brd_design():
     def brd_general(self):
         self.brd=dsnwritier.Dsn()
         self.layers=[
-            dsnwritier.Layer('F.Cu'),
-            dsnwritier.Layer('B.Cu'),
-            dsnwritier.Layer('F.Mask'),
-            dsnwritier.Layer('B.Mask')
+            dsnwritier.Layer('F.Cu')
+            # dsnwritier.Layer('B.Cu'),
+            # dsnwritier.Layer('F.Mask'),
+            # dsnwritier.Layer('B.Mask')
         ]
         
         self.parsers= dsnwritier.Parser()

paperbot_ee_autoroute/paperbot_ee.dsn

@@ -12,28 +12,18 @@
     (type signal) 
     (property 
         (index 0))) 
-(layer B.Cu 
-    (type signal) 
-    (property 
-        (index 1))) 
-(layer F.Mask 
-    (type signal) 
-    (property 
-        (index 2))) 
-(layer B.Mask 
-    (type signal) 
-    (property 
-        (index 3))) 
 (boundary 
-    (path pcb 0 -26696.2760000000 -280310.9110000000 216684.7830000000 -280310.9110000000 216684.7830000000 19577.2840000000 -26696.2760000000 19577.2840000000)) 
+    (path pcb 0 -12458.2620000000 -280310.9110000000 222913.9010000000 -280310.9110000000 222913.9010000000 31145.6610000000 -12458.2620000000 31145.6610000000)) 
 (keepout "" 
     (  polygon signal 0 106000.2480000000 -113732.1160000000 106000.2480000000 -113467.5320000000 118999.9710000000 -113467.5320000000 118999.9710000000 -113732.1160000000)) 
 (keepout "" 
     (  polygon signal 0 106000.2480000000 -151732.3810000000 106000.2480000000 -151467.7980000000 118999.9710000000 -151467.7980000000 118999.9710000000 -151732.3810000000)) 
+(keepout "" 
+    (  polygon signal 0 59999.9540000000 -31732.4810000000 59999.9540000000 -31467.8970000000)) 
 (keepout "" 
     (  polygon signal 0 35999.8700000000 -31732.4810000000 35999.8700000000 -31467.8970000000 59999.9540000000 -31467.8970000000 59999.9540000000 -31732.4810000000)) 
 (keepout "" 
-    (  polygon signal 0 0.0000000000 -31732.4810000000 0.0000000000 -31467.8970000000 24000.0850000000 -31467.8970000000 24000.0850000000 -31732.4810000000)) 
+    (  polygon signal 0 0.0000000000 -31732.4810000000 0.0000000000 -31467.8970000000 24000.0850000000 -31467.8970000000 24000.0850000000 -31732.4810000000 0.0000000000 -31732.4810000000 0.0000000000 -31467.8970000000)) 
 (keepout "" 
     (  polygon signal 0 106000.2480000000 -18132.2620000000 106000.2480000000 -17867.6790000000 110000.0050000000 -17867.6790000000 110000.0050000000 -18132.2620000000)) 
 (keepout "" 
@@ -181,9 +171,13 @@
 (keepout "" 
     (  polygon signal 0 36999.8100000000 -151732.3810000000 36999.8100000000 -151467.7980000000 81000.2240000000 -151467.7980000000 81000.2240000000 -151732.3810000000)) 
 (keepout "" 
-    (  polygon signal 0 153593.7260000000 -171693.4370000000 153406.6580000000 -171506.3680000000 158632.1780000000 -166280.8470000000 158632.1780000000 -171599.9040000000 158367.5950000000 -171599.9040000000 158367.5950000000 -166919.5670000000)) 
+    (  polygon signal 0 153593.7260000000 -171693.4370000000 153406.6580000000 -171506.3680000000 158406.3510000000 -166506.6750000000 158593.4200000000 -166693.7430000000)) 
 (keepout "" 
-    (  polygon signal 0 158406.3510000000 -196693.4610000000 153367.8990000000 -191655.0080000000 153367.8990000000 -171599.9040000000 153632.4820000000 -171599.9040000000 153632.4820000000 -191545.4550000000 158593.4200000000 -196506.3920000000)) 
+    (  polygon signal 0 158367.5950000000 -171599.9040000000 158367.5950000000 -166600.2070000000 158632.1780000000 -166600.2070000000 158632.1780000000 -171599.9040000000)) 
+(keepout "" 
+    (  polygon signal 0 158406.3510000000 -196693.4610000000 153406.6580000000 -191693.7670000000 153593.7260000000 -191506.6990000000 158593.4200000000 -196506.3920000000)) 
+(keepout "" 
+    (  polygon signal 0 153367.8990000000 -191600.2310000000 153367.8990000000 -171599.9040000000 153632.4820000000 -171599.9040000000 153632.4820000000 -191600.2310000000)) 
 (keepout "" 
     (  polygon signal 0 158367.5950000000 -196599.9280000000 158367.5950000000 -191600.2310000000 158632.1780000000 -191600.2310000000 158632.1780000000 -196599.9280000000)) 
 (keepout "" 
@@ -199,7 +193,9 @@
 (keepout "" 
     (  polygon signal 0 103367.8510000000 -236933.3820000000 103367.8510000000 -224266.4540000000 103632.4340000000 -224266.4540000000 103632.4340000000 -236933.3820000000)) 
 (keepout "" 
-    (  polygon signal 0 103406.6070000000 -224359.9900000000 98632.2220000000 -219586.1210000000 98632.2220000000 -224266.4540000000 98367.6380000000 -224266.4540000000 98367.6380000000 -218947.4010000000 103593.6780000000 -224172.9220000000)) 
+    (  polygon signal 0 98367.6380000000 -224266.4540000000 98367.6380000000 -219266.7610000000 98632.2220000000 -219266.7610000000 98632.2220000000 -224266.4540000000)) 
+(keepout "" 
+    (  polygon signal 0 103406.6070000000 -224359.9900000000 98406.3970000000 -219360.2940000000 98593.4650000000 -219173.2250000000 103593.6780000000 -224172.9220000000)) 
 (keepout "" 
     (  polygon signal 0 31750.0000000000 -35982.3400000000 31750.0000000000 -35717.7570000000 32250.2270000000 -35717.7570000000 32250.2270000000 -35982.3400000000)) 
 (keepout "" 
@@ -223,9 +219,13 @@
 (keepout "" 
     (  polygon signal 0 101999.9760000000 -31632.2300000000 101999.9760000000 -31367.6470000000 113999.7590000000 -31367.6470000000 113999.7590000000 -31632.2300000000)) 
 (keepout "" 
-    (  polygon signal 0 129117.7010000000 -208982.1160000000 129117.7010000000 -181717.6310000000 137382.3110000000 -181717.6310000000 137382.3110000000 -181849.9230000000 137382.3110000000 -208982.1160000000)) 
+    (  polygon signal 0 137117.7280000000 -208849.8240000000 137117.7280000000 -181849.9230000000 137382.3110000000 -181849.9230000000 137382.3110000000 -208849.8240000000)) 
+(keepout "" 
+    (  polygon signal 0 129249.9930000000 -208982.1160000000 129249.9930000000 -208717.5320000000 137250.0190000000 -208717.5320000000 137250.0190000000 -208982.1160000000)) 
 (keepout "" 
-    (  polygon signal 0 129382.2850000000 -208717.5320000000 137117.7280000000 -208717.5320000000 137117.7280000000 -181982.2150000000 129382.2850000000 -181982.2150000000)) 
+    (  polygon signal 0 129117.7010000000 -208849.8240000000 129117.7010000000 -181849.9230000000 129382.2850000000 -181849.9230000000 129382.2850000000 -208849.8240000000)) 
+(keepout "" 
+    (  polygon signal 0 129249.9930000000 -181982.2150000000 129249.9930000000 -181717.6310000000 137250.0190000000 -181717.6310000000 137250.0190000000 -181982.2150000000)) 
 (keepout "" 
     (  polygon signal 0 98000.2190000000 -132.3410000000 98000.2190000000 132.2430000000 118000.0340000000 132.2430000000 118000.0340000000 -132.3410000000)) 
 (keepout "" 
@@ -283,9 +283,13 @@
 (keepout "" 
     (  polygon signal 0 158593.4200000000 -83875.5400000000 158406.3510000000 -83688.4720000000 163406.5630000000 -78688.2620000000 163593.6320000000 -78875.3300000000)) 
 (keepout "" 
-    (  polygon signal 0 98367.6380000000 -242252.9540000000 98367.6380000000 -236933.3820000000 98632.2220000000 -236933.3820000000 98632.2220000000 -241613.7180000000 103406.6070000000 -236839.8490000000 103593.6780000000 -237026.9170000000)) 
+    (  polygon signal 0 98593.4660000000 -242027.1290000000 98406.3970000000 -241839.5420000000 103406.6070000000 -236839.8490000000 103593.6780000000 -237026.9170000000)) 
+(keepout "" 
+    (  polygon signal 0 98367.6380000000 -241933.0780000000 98367.6380000000 -236933.3820000000 98632.2220000000 -236933.3820000000 98632.2220000000 -241933.0780000000)) 
+(keepout "" 
+    (  polygon signal 0 137999.8460000000 -113732.1160000000 137999.8460000000 -113467.5320000000 151000.0840000000 -113467.5320000000 151000.0840000000 -113732.1160000000 137999.8460000000 -113732.1160000000 137999.8460000000 -113467.5320000000)) 
 (keepout "" 
-    (  polygon signal 0 137999.8460000000 -113732.1160000000 137999.8460000000 -113467.5320000000 151000.0840000000 -113467.5320000000 151000.0840000000 -113732.1160000000)) 
+    (  polygon signal 0 77999.8890000000 -113732.1160000000 77999.8890000000 -113467.5320000000)) 
 (keepout "" 
     (  polygon signal 0 96999.7640000000 -113732.1160000000 96999.7640000000 -113467.5320000000 118999.9710000000 -113467.5320000000 118999.9710000000 -113732.1160000000)) 
 (keepout "" 

paperbot_ee_autoroute/paperbot_ee.rules

@@ -11,30 +11,12 @@
     (via_costs 50)
     (plane_via_costs 5)
     (start_ripup_costs 100)
-    (start_pass_no 80)
+    (start_pass_no 81)
     (layer_rule F.Cu
-      (active on)
-      (preferred_direction vertical)
-      (preferred_direction_trace_costs 1.8)
-      (against_preferred_direction_trace_costs 3.0)
-    )
-    (layer_rule B.Cu
-      (active on)
-      (preferred_direction horizontal)
-      (preferred_direction_trace_costs 1.0)
-      (against_preferred_direction_trace_costs 1.8)
-    )
-    (layer_rule F.Mask
       (active on)
       (preferred_direction vertical)
       (preferred_direction_trace_costs 1.0)
-      (against_preferred_direction_trace_costs 2.2)
-    )
-    (layer_rule B.Mask
-      (active on)
-      (preferred_direction horizontal)
-      (preferred_direction_trace_costs 1.8)
-      (against_preferred_direction_trace_costs 2.6)
+      (against_preferred_direction_trace_costs 2.3)
     )
   )
   (rule
@@ -55,7 +37,7 @@
       (width 1000.0)
     )
     (circuit 
-      (use_layer F.Cu B.Cu F.Mask B.Mask)
+      (use_layer F.Cu)
     )
   )
 )
\ No newline at end of file

paperbot_ee_autoroute/paperbot_ee.ses

@@ -23,23 +23,23 @@
     (network_out 
       (net 3v3
         (wire
-          (path F.Mask 10000
-            890300 -600650
-            918654 -629004
-            1049358 -629004
-            1131600 -711246
+          (path F.Cu 10000
             1131600 -816500
+            1131600 -694273
+            1066334 -629007
+            918657 -629007
+            890300 -600650
           )
         )
       )
       (net NET1
         (wire
-          (path B.Cu 10000
+          (path F.Cu 10000
             864900 -600650
-            916308 -652058
-            1072390 -652058
-            1086143 -665811
-            1086143 -760357
+            914245 -649995
+            1070350 -649995
+            1086128 -665773
+            1086128 -760372
             1030000 -816500
           )
         )