phooky · January 25, 2012 01:08 · Jan 25, 2012
diff --git a/dragon.py b/dragon.py
@@ -0,0 +1,54 @@
+#!/usr/bin/python
+
+import sdxf
+from math import sqrt, sin, cos, pi
+
+iterations = 11
+
+def move(pos,angle,distance):
+    nx = pos[0] + sin(angle)*distance
+    ny = pos[1] + cos(angle)*distance
+    return (nx,ny)
+
+def flipElement(c):
+    if (c == 'L'): return 'R'
+    else: return 'L'
+
+def generateTurns(iterations):
+    if (iterations == 0):
+        return ['R']
+    else:
+        i = generateTurns(iterations-1)
+        j = i + ['R']
+        i.reverse()
+        j = j + map(flipElement,i)
+        return j
+
+turns = generateTurns(iterations)
+direction = -pi/4
+distance = 1.0
+cutoff = 0.78
+location = (0,0)
+left = pi/2
+
+def doTurn(direction,whichway,amount):
+    if whichway == 'L':
+        direction = direction + amount
+    else:
+        direction = direction - amount
+    return direction
+
+d=sdxf.Drawing()
+d.layers.append(sdxf.Layer(name='DRAGON'))
+for turn in turns:
+    nl = move(location,direction,distance*cutoff)
+    d.append(sdxf.Line(points=[location,nl],layer='DRAGON'))
+    location = nl
+    direction = doTurn(direction,turn,pi/4)
+
+    nl = move(location,direction,distance*(1.0-cutoff))
+    d.append(sdxf.Line(points=[location,nl],layer='DRAGON'))
+    location = nl
+    direction = doTurn(direction,turn,pi/4)
+
+d.saveas("dragon.dxf")