Added MapCSS-like styling engine.

TODO: integrate it with converter and renderer

src/kothic.py

@@ -76,7 +76,7 @@ class Navigator:
     self.drag_y = 0
     self.drag = False
     self.tilecache = {}
-    self.border = 500
+    self.border = 200
     self.rastertile = None
     self.f = True
     undef = None

src/style.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#    This file is part of kothic, the realtime map renderer.
+
+#   kothic 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.
+
+#   kothic 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 kothic.  If not, see <http://www.gnu.org/licenses/>.
+
+### TODO: MapCSS loading and parsing
+
+
+from debug import debug
+
+class Styling():
+  """
+  Class used to choose the right way of rendering an object.
+  """
+  def __init__(self, stylefile = None):
+    self.Selectors = {}
+    self.Selectors["way"] = []
+    self.Selectors["node"] = []
+    self.Selectors["relation"] = []
+    if not stylefile:
+      ### using "builtin" styling
+      self.Selectors["way"].append(StyleSelector( ( [ ( ("highway",),("residential", "tertiary", "living_street")) ]  ),{"width": 5, "color":"#ffffff"} ))
+      self.Selectors["way"].append(StyleSelector( ( [ ( ("building",),(None) ) ] ),{"width": 1, "fill-color":"#ff0000"} ))
+    self.stylefile = stylefile
+
+  def get_style(self, objtype, tags):
+    """
+    objtype is "node", "way" or "relation"
+    tags - object tags
+    """
+    resp = {}
+    for selector in self.Selectors[objtype]:
+      resp.update(selector.get_style(tags))
+    return resp
+    
+class StyleSelector():
+  def __init__(self, tags, style):
+    """
+    Selector that decides if that style is right for the object
+    tags - list of tags [(("key","key"..), ("value", "value"...)), (("key","key"..), ("value", "value"...))]
+    style - MapCSS rules to apply
+    """
+    self.tags = tags
+    self.style = style
+  def get_style(self, tags):
+    """
+    Get actual styling for object.
+    """
+    styled = False
+    #debug(self.tags)
+    for k,v in self.tags:
+      for j in k:
+        if j in tags:
+          if v:
+            if tags[j] in v:
+              styled = True
+          styled = True
+        if styled:
+          return self.style
+    return {}
+  
+if __name__ == "__main__":
+  c = Styling()
+  print c.get_style("way", {"building":"yes"})
+  print c.get_style("way", {"highway":"residential"})
+  print c.get_style("way", {"highway":"residential", "building": "yes"})