Layers are now arranged as a tree data structure.

1 files changed, 77 insertions, 0 deletions

diff --git a/ep_directionconstraint_vector.py b/ep_directionconstraint_vector.py
new file mode 100644
index 0000000..2627d1c
--- /dev/null
+++ b/ep_directionconstraint_vector.py
@@ -0,0 +1,77 @@
+# coding: UTF8
+# Copyright 2009 Thomas Jourdan
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+"""Extension point for directional constraints.
+This module handles vectors constrained by angle and length."""
+
+import math
+import model_random
+import model_constraintpool
+import model_locus
+
+DISTANCE_CONSTRAINT = 'distance'
+RADIAN_CONSTRAINT = 'radian'
+
+class VectorDirectionConstraint(model_locus.Locus):
+    """Constraint for direction vectors."""
+
+    cdef = [{'bind'  : DISTANCE_CONSTRAINT,
+             'name'  : 'Distance per hop',
+             'domain': model_constraintpool.FLOAT_RANGE,
+             'min'   : 0.0, 'max': 0.5,
+            },
+            {'bind'  : RADIAN_CONSTRAINT,
+             'name'  : 'Rotation in radians',
+             'domain': model_constraintpool.FLOAT_RANGE,
+             'min'   : -1.0*math.pi, 'max': math.pi,
+            },
+           ]
+
+    def __init__(self, trunk):
+        """Direction constraint constructor."""
+        super(VectorDirectionConstraint, self).__init__(trunk)
+        
+    def filter(self, radian, distance):
+        """No constraints for radian and distance.
+        post: (-1.0*math.pi) <= __return__[0] <= math.pi
+        post: __return__[1] >= 0.0
+        """
+        return model_random.radian_limit(radian), math.fabs(distance)
+
+    def randomize(self):
+        """Set radian and distance to random values.
+        post: (-1.0*math.pi) <= __return__[0] <= math.pi
+        post: __return__[1] >= 0.0
+        """
+        cpool = model_constraintpool.ConstraintPool.get_pool()
+        radian_constraint = cpool.get(self, RADIAN_CONSTRAINT)
+        distance_constraint = cpool.get(self, DISTANCE_CONSTRAINT)
+        radian = model_random.uniform_constrained(radian_constraint)
+        distance = model_random.uniform_constrained(distance_constraint)
+        return model_random.radian_limit(radian), math.fabs(distance)
+
+    def mutate(self, radian, distance):
+        """Make small random changes in radian and distance.
+        post: (-1.0*math.pi) <= __return__[0] <= math.pi
+        post: __return__[1] >= 0.0
+        """
+        cpool = model_constraintpool.ConstraintPool.get_pool()
+        radian_constraint = cpool.get(self, RADIAN_CONSTRAINT)
+        distance_constraint = cpool.get(self, DISTANCE_CONSTRAINT)
+        radian = model_random.jitter_constrained(radian, radian_constraint)
+        distance = model_random.jitter_constrained(distance, distance_constraint)
+        return model_random.radian_limit(radian), math.fabs(distance)