X-Git-Url: https://git.ctpug.org.za/?a=blobdiff_plain;f=tabakrolletjie%2Frays.py;h=b4142a3e6694f8ecaeb4f67264a4bb270ca7a025;hb=a2c09130986d18095773c96b9dc797f3b3eb542d;hp=6e98d83337d646f39f1d4c5d27f06e1c42f906d5;hpb=1cdc29cb8d944e3a25bb8518e00842201e6b9285;p=tabakrolletjie.git

diff --git a/tabakrolletjie/rays.py b/tabakrolletjie/rays.py
index 6e98d83..b4142a3 100644
--- a/tabakrolletjie/rays.py
+++ b/tabakrolletjie/rays.py
@@ -78,14 +78,16 @@ def to_pymunk_radians(deg):
 
 class RayPolyManager(object):
     def __init__(
-            self, body, position, ray_filter, radius_limits, angle_limits):
+            self, body, position, ray_filter, radius_limits, direction,
+            spread):
         self._body = body  # light's body
         self._position = pymunk.Vec2d(position)  # light's position
         self._ray_filter = ray_filter  # light filter
         self._rays = []  # list of RayPolys
+        self._direction = None  # normal vector for direction
         self._start = None  # normal vector in direction of start angle limit
         self._end = None  # normal vector in direction of end angle limit
-        self._set_angle_limits(angle_limits)
+        self._set_angle_limits(direction, spread)
         self._max_radius = None  # maximum radius in pixels
         self._min_radius = None  # minimum radius in pixels
         self._set_radius_limits(radius_limits)
@@ -139,20 +141,36 @@ class RayPolyManager(object):
         else:
             self._max_radius = radius_limits[1]
 
-    def rotate_degrees(self, degrees):
-        self._start.rotate_degrees(degrees)
-        self._end.rotate_degrees(degrees)
+    def rotatable(self):
+        return self._direction is not None
+
+    @property
+    def direction(self):
+        return self._direction.angle_degrees
+
+    @direction.setter
+    def direction(self, degrees):
+        spread = self._direction.get_angle_between(self._start)
+        self._direction.angle_degrees = degrees
+        self._start = self._direction.rotated(spread)
+        self._end = self._direction.rotated(-spread)
         self._poly_cache = None
 
-    def _set_angle_limits(self, angle_limits):
-        if angle_limits is None:
+    @property
+    def spread(self):
+        if not self._direction:
+            return 2 * math.pi
+        return math.fabs(self._start.get_angle_between(self._end))
+
+    def _set_angle_limits(self, direction, spread):
+        if direction is None or spread is None:
+            self._direction = None
             self._start = None
             self._end = None
         else:
-            self._start = pymunk.Vec2d(1, 0).rotated(
-                to_pymunk_radians(angle_limits[0]))
-            self._end = pymunk.Vec2d(1, 0).rotated(
-                to_pymunk_radians(angle_limits[1]))
+            self._direction = pymunk.Vec2d(1, 0)
+            self._start = self._direction.rotated_degrees(-spread/2.)
+            self._end = self._direction.rotated_degrees(spread/2.)
         self._poly_cache = None
 
     def polys(self):