From 6507b1369a45af7fb77a0bcd77194fbc880683ee Mon Sep 17 00:00:00 2001
From: Hannes Janetzek <hannes.janetzek@gmail.com>
Date: Tue, 18 Feb 2014 21:28:57 +0100
Subject: [PATCH] add AbstractVectorLayer

---
 .../layers/vector/AbstractVectorLayer.java    | 126 ++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 vtm/src/org/oscim/layers/vector/AbstractVectorLayer.java

diff --git a/vtm/src/org/oscim/layers/vector/AbstractVectorLayer.java b/vtm/src/org/oscim/layers/vector/AbstractVectorLayer.java
new file mode 100644
index 00000000..e08adc93
--- /dev/null
+++ b/vtm/src/org/oscim/layers/vector/AbstractVectorLayer.java
@@ -0,0 +1,126 @@
+package org.oscim.layers.vector;
+
+import org.oscim.core.BoundingBox;
+import org.oscim.core.GeometryBuffer;
+import org.oscim.core.MapPosition;
+import org.oscim.core.Tile;
+import org.oscim.event.Event;
+import org.oscim.layers.Layer;
+import org.oscim.map.Map;
+import org.oscim.map.Map.UpdateListener;
+import org.oscim.map.Viewport;
+import org.oscim.renderer.ElementRenderer;
+import org.oscim.renderer.GLViewport;
+import org.oscim.renderer.elements.ElementLayers;
+import org.oscim.utils.async.SimpleWorker;
+import org.oscim.utils.geom.TileClipper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class AbstractVectorLayer<T> extends Layer implements UpdateListener {
+	public static final Logger log = LoggerFactory.getLogger(AbstractVectorLayer.class);
+
+	protected final static double UNSCALE_COORD = 4;
+
+	protected final GeometryBuffer mGeom = new GeometryBuffer(128, 4);
+	protected final TileClipper mClipper = new TileClipper(-1024, -1024, 1024, 1024);
+
+	protected final Worker mWorker;
+	protected long mUpdateDelay = 100;
+
+	protected boolean mUpdate = true;
+
+	protected double mMinX;
+	protected double mMinY;
+
+	public AbstractVectorLayer(Map map) {
+		super(map);
+		mWorker = new Worker(mMap);
+		mRenderer = new Renderer();
+	}
+
+	@Override
+	public void onDetach() {
+		super.onDetach();
+
+		mWorker.cancel(true);
+	}
+
+	@Override
+	public void onMapEvent(Event e, MapPosition pos) {
+		if (mUpdate) {
+			mUpdate = false;
+			mWorker.submit(0);
+		} else if (e == Map.POSITION_EVENT || e == Map.CLEAR_EVENT) {
+			// throttle worker
+			mWorker.submit(mUpdateDelay);
+		}
+	}
+
+	public void update() {
+		mWorker.submit(0);
+	}
+
+	abstract protected void processFeatures(Task t, BoundingBox b);
+
+	protected class Task {
+		public final ElementLayers layers = new ElementLayers();
+		public final MapPosition position = new MapPosition();
+	}
+
+	protected class Worker extends SimpleWorker<Task> {
+
+		public Worker(Map map) {
+			super(map, 50, new Task(), new Task());
+		}
+
+		/** automatically in sync with worker thread */
+		@Override
+		public void cleanup(Task t) {
+			if (t.layers != null)
+				t.layers.clear();
+		}
+
+		/** running on worker thread */
+		@Override
+		public boolean doWork(Task t) {
+			Viewport v = mMap.viewport();
+			BoundingBox bbox;
+			synchronized (v) {
+				bbox = v.getBBox();
+				v.getMapPosition(t.position);
+			}
+
+			double scale = t.position.scale * Tile.SIZE;
+
+			t.position.x = (long) (t.position.x * scale) / scale;
+			t.position.y = (long) (t.position.y * scale) / scale;
+			processFeatures(t, bbox);
+
+			mMap.render();
+			return true;
+		}
+
+	}
+
+	public class Renderer extends ElementRenderer {
+		MapPosition mTmpPos = new MapPosition();
+
+		@Override
+		protected void update(GLViewport v) {
+
+			Task t = mWorker.poll();
+
+			if (t == null)
+				return;
+
+			mMapPosition.copy(t.position);
+			mMapPosition.setScale(mMapPosition.scale / UNSCALE_COORD);
+
+			layers.setFrom(t.layers);
+
+			compile();
+			//log.debug("is ready " + isReady() + " " + layers.getSize());
+		}
+	}
+}