1 files changed, 67 insertions, 0 deletions
diff --git a/src/3rdparty/2geom/tests/test_pwsb.py b/src/3rdparty/2geom/tests/test_pwsb.py
new file mode 100644
index 0000000..6182d40
--- /dev/null
+++ b/src/3rdparty/2geom/tests/test_pwsb.py
@@ -0,0 +1,67 @@
+#!/usr/bin/python
+
+import sys
+sys.path.append(os.path.join(os.path.dirname(__file__), "..", "py2geom"))
+
+from  py2geom import *
+import py2geom
+import numpy
+import random
+from py2geom_glue import *
+
+def poly_to_sbasis(p):
+    sb = SBasis()
+    s = numpy.poly1d([-1, 1, 0])
+    while True:
+        q,r = p / s
+        x = Linear(r[0],r[1]+r[0])
+        sb.append(x)
+        p = q
+        if len(list(p)) <= 1 and p[0] == 0:
+            return sb
+
+def sbasis_to_poly(sb):
+    p = numpy.poly1d([0])
+    s = numpy.poly1d([-1, 1, 0])
+    sp = numpy.poly1d([1])
+    for sbt in sb:
+        p += sp*(sbt[0]*(numpy.poly1d([-1,1])) + sbt[1]*(numpy.poly1d([1,0])))
+        sp *= s
+    return p
+
+random.seed(1)
+trial = numpy.poly1d([random.randrange(0,10) for x in range(6)])
+
+sb = poly_to_sbasis(trial)
+
+pwsb = PiecewiseSBasis()
+pwsb.push_seg(sb)
+pwsb.push_cut(0)
+pwsb.push_cut(1)
+print pwsb.size()
+print "invariants:", pwsb.invariants()
+print pwsb(0)
+
+def l2s(l):
+    sb = py2geom.SBasis()
+    sb.append(l)
+    return sb
+
+X = l2s(py2geom.Linear(0, 1))
+OmX = l2s(py2geom.Linear(1, 0))
+def bezier_to_sbasis(handles, order):
+    print "b2s:", handles, order
+    if(order == 0):
+        return l2s(py2geom.Linear(handles[0]))
+    elif(order == 1):
+        return l2s(py2geom.Linear(handles[0], handles[1]))
+    else:
+        return (py2geom.multiply(OmX, bezier_to_sbasis(handles[:-1], order-1)) +
+                py2geom.multiply(X, bezier_to_sbasis(handles[1:], order-1)))
+
+
+for bz in [[0,1,0], [0,1,2,3]]:
+    sb = bezier_to_sbasis(bz, len(bz)-1)
+    print bz
+    print sb
+    print sbasis_to_bezier(sb,0)