added drawing api

add GeomBuilder, needs Jts

drawing_api: squashed

drawing_api: use JtsDrawable baseclass

- add makeCircle for testing

drawing_api: cleanups

drawing_api: refactor

drawing_api: use SpatialIndex

drawing_api: optimization + cleanup

drawing_api: VectorLayer

- use VectorLayer for PathLayer

drawing_api: make style builder more consistent with theme api

drawing_api: wip

vtm-jeo/src/org/oscim/layers/JeoVectorLayer.java

@@ -33,6 +33,8 @@ public class JeoVectorLayer extends JtsLayer {
 	private final RuleList mRules;
 
 	protected double mDropPointDistance = 0.01;
+	private double mMinX;
+	private double mMinY;
 
 	public JeoVectorLayer(Map map, VectorDataset data, Style style) {
 		super(map);