bdd: move grid generation code into geometry factory

test/bdd/steps/geometry_factory.py

@@ -9,7 +9,7 @@ class GeometryFactory:
         defpath = Path(__file__) / '..' / '..' / '..' / 'scenes' / 'data'
         self.scene_path = os.environ.get('SCENE_PATH', defpath.resolve())
         self.scene_cache = {}
-        self.clear_grid()
+        self.grid = {}
 
     def parse_geometry(self, geom, scene):
         """ Create a WKT SQL term for the given geometry.
@@ -103,11 +103,20 @@ class GeometryFactory:
 
         return scene
 
-    def clear_grid(self):
+    def set_grid(self, lines, grid_step):
+        """ Replace the grid with one from the given lines.
+        """
         self.grid = {}
-
-    def add_grid_node(self, nodeid, x, y):
-        self.grid[nodeid] = (x, y)
+        y = 0
+        for line in lines:
+            x = 0
+            for pt_id in line:
+                if pt_id.isdigit():
+                    self.grid[int(pt_id)] = (x, y)
+                x += grid_step
+            y += grid_step
 
     def grid_node(self, nodeid):
+        """ Get the coordinates for the given grid node.
+        """
         return self.grid.get(nodeid)

test/bdd/steps/osm_data.py

@@ -7,28 +7,16 @@ import os
 def define_node_grid(context, grid_step):
     """
     Define a grid of node positions.
+    Use a table to define the grid. The nodes must be integer ids. Optionally
+    you can give the grid distance. The default is 0.00001 degrees.
     """
     if grid_step is not None:
         grid_step = float(grid_step.strip())
     else:
         grid_step = 0.00001
 
-    context.osm.clear_grid()
-
-    i = 0
-    for h in context.table.headings:
-        if h.isdigit():
-            context.osm.add_grid_node(int(h), 0, i)
-        i += grid_step
-
-    x = grid_step
-    for r in context.table:
-        y = 0
-        for h in r:
-            if h.isdigit():
-                context.osm.add_grid_node(int(h), x, y)
-            y += grid_step
-        x += grid_step
+    context.osm.set_grid([context.table.headings] + [list(h) for h in context.table],
+                          grid_step)
 
 
 @when(u'loading osm data')