1 files changed, 100 insertions, 0 deletions
diff --git a/gerbonara/cad/breakout.py b/gerbonara/cad/breakout.py
new file mode 100644
index 0000000..fae06c9
--- /dev/null
+++ b/gerbonara/cad/breakout.py
@@ -0,0 +1,100 @@
+
+from dataclasses import dataclass
+
+from ..utils import MM
+from .primitives import *
+
+
+@dataclass
+class PadRing(Positioned):
+    w: int
+    h: int
+    pitch: float = 2.54
+    clearance: float = 0.2
+    rows: int = 2
+    trace_width: float = 0.4
+    drill_dia: float = 0.9
+    stagger: bool = False
+
+    def ports(self):
+        x, y, rotation = self.abs_pos
+
+        x += self.pitch/2
+        y += self.pitch/2
+
+        x += self.pitch * self.rows
+        y += self.pitch * self.rows
+
+        pad_dia = self.pitch - 2*self.clearance - self.trace_width
+        offset = pad_dia/2 - self.trace_width/2
+
+        for i in range(1, self.w):
+            yield (x+self.pitch/2 + i*self.pitch, y+offset)
+            yield (x+self.pitch/2 + i*self.pitch, y+(self.h+1)*self.pitch-offset)
+
+        for i in range(1, self.h):
+            yield (x+offset, y+self.pitch/2 + i*self.pitch)
+            yield (x+(self.w+1)*self.pitch-offset, y+self.pitch/2 + i*self.pitch)
+
+
+    def generate(self, bbox, border_text, unit=MM):
+        x, y, rotation = self.abs_pos
+
+        x += self.pitch/2
+        y += self.pitch/2
+
+        x += self.pitch * self.rows
+        y += self.pitch * self.rows
+
+        pad_dia = self.pitch - 2*self.clearance - self.trace_width
+
+        for i in range(self.w + 2 + 2*(self.rows-1)):
+            for j in range(self.rows):
+                yield THTPad.circle(x + (i - (self.rows - 1))*self.pitch, y - j*self.pitch, self.drill_dia, pad_dia, paste=False)
+                yield THTPad.circle(x + (i - (self.rows - 1))*self.pitch, y + (self.h + 1 + j)*self.pitch, self.drill_dia, pad_dia, paste=False)
+
+            if self.rows >= 2 and 1 <= i < self.w:
+                yield Trace(self.trace_width, start=(x+i*self.pitch, y-self.pitch), end=(x+(i + 0.5)*self.pitch, y+pad_dia/2 - self.trace_width/2))
+                yield Trace(self.trace_width, start=(x+i*self.pitch, y+(self.h+2)*self.pitch), end=(x+(i + 0.5)*self.pitch, y+(self.h+1)*self.pitch -pad_dia/2 + self.trace_width/2), orientation=('cw',))
+
+        for i in range(1, self.h+1):
+            for j in range(self.rows):
+                yield THTPad.circle(x - j*self.pitch, y + i*self.pitch, self.drill_dia, pad_dia, paste=False)
+                yield THTPad.circle(x + (self.w + 1 + j)*self.pitch, y + i*self.pitch, self.drill_dia, pad_dia, paste=False)
+
+            if self.rows >= 2 and i < self.h:
+                yield Trace(self.trace_width,
+                            start=(
+                                x-self.pitch,
+                                y+i*self.pitch),
+                            end=(
+                                x+pad_dia/2 - self.trace_width/2,
+                                y+(i + 0.5)*self.pitch),
+                            orientation=('cw',))
+                yield Trace(self.trace_width,
+                            start=(
+                                x+(self.w+2)*self.pitch,
+                                y+i*self.pitch),
+                            end=(
+                                x+(self.w+1)*self.pitch -pad_dia/2 + self.trace_width/2,
+                                y+(i + 0.5)*self.pitch))
+
+
+def _breakout_demo():
+    b = Board(100, 80)
+    
+    ring = PadRing(5, 5, 8, 12)
+    for obj in ring.generate(None, None):
+        b.add(obj)
+
+    for x, y in ring.ports():
+        b.add(Trace(0.1, start=(23, 27), end=(x, y)))
+
+    with open('/tmp/test.svg', 'w') as f:
+        f.write(str(b.pretty_svg()))
+    b.layer_stack().save_to_directory('/tmp/testdir')
+
+
+if __name__ == '__main__':
+    _breakout_demo()
+