initial commit

billinglayer/python/shapely/coords.py

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+"""Coordinate sequence utilities
+"""
+from array import array
+
+
+class CoordinateSequence:
+    """
+    Iterative access to coordinate tuples from the parent geometry's coordinate
+    sequence.
+
+    Example:
+
+      >>> from shapely.wkt import loads
+      >>> g = loads('POINT (0.0 0.0)')
+      >>> list(g.coords)
+      [(0.0, 0.0)]
+
+    """
+
+    def __init__(self, coords):
+        self._coords = coords
+
+    def __len__(self):
+        return self._coords.shape[0]
+
+    def __iter__(self):
+        for i in range(self.__len__()):
+            yield tuple(self._coords[i].tolist())
+
+    def __getitem__(self, key):
+        m = self.__len__()
+        if isinstance(key, int):
+            if key + m < 0 or key >= m:
+                raise IndexError("index out of range")
+            if key < 0:
+                i = m + key
+            else:
+                i = key
+            return tuple(self._coords[i].tolist())
+        elif isinstance(key, slice):
+            res = []
+            start, stop, stride = key.indices(m)
+            for i in range(start, stop, stride):
+                res.append(tuple(self._coords[i].tolist()))
+            return res
+        else:
+            raise TypeError("key must be an index or slice")
+
+    def __array__(self, dtype=None):
+        return self._coords
+
+    @property
+    def xy(self):
+        """X and Y arrays"""
+        m = self.__len__()
+        x = array("d")
+        y = array("d")
+        for i in range(m):
+            xy = self._coords[i].tolist()
+            x.append(xy[0])
+            y.append(xy[1])
+        return x, y