BezierTest.java

package org.oscim.test.renderer;

import java.util.List;

import org.oscim.backend.canvas.Color;
import org.oscim.core.GeometryBuffer;
import org.oscim.core.Point;
import org.oscim.gdx.GdxMap;
import org.oscim.gdx.GdxMapApp;
import org.oscim.layers.GenericLayer;
import org.oscim.renderer.BucketRenderer;
import org.oscim.renderer.GLViewport;
import org.oscim.renderer.bucket.LineBucket;
import org.oscim.theme.styles.LineStyle;
import org.oscim.utils.geom.BezierPath;

public class BezierTest extends GdxMap {

	@Override
	protected void createLayers() {
		mMap.layers().add(new GenericLayer(mMap, new BezierPathLayer()));
	}

	public static void main(String[] args) {
		GdxMapApp.init();
		GdxMapApp.run(new BezierTest(), null, 400);
	}

	static class BezierPathLayer extends BucketRenderer {

		public BezierPathLayer() {
			mMapPosition.scale = 0;

			GeometryBuffer g = new GeometryBuffer(100, 1);
			g.startLine();

			Point[] pts = new Point[10];
			for (int i = 0; i < 10; i++) {
				pts[i] = new Point(i * 3, (i * i) % 3 * 4);
				pts[i].x *= 10;
				pts[i].y *= 10;
				// System.out.println(pts[i]);
				g.addPoint(pts[i]);
			}
			LineBucket ll = buckets.addLineBucket(0, new LineStyle(Color.BLUE, 2f));
			ll.addLine(g);

			List<Point> ctrl = BezierPath.cubicSplineControlPoints(pts, 0.1f);

			g.clear();
			g.startLine();
			Point p0 = pts[0];

			for (int j = 1, k = 0; j < pts.length; j++) {
				Point p1 = ctrl.get(k++);
				Point p2 = ctrl.get(k++);
				Point p3 = pts[j];
				System.out.println(">>> " + p1 + " " + p2);
				for (int i = 0; i < 10; i++) {
					double mu = (i / 10f);
					Point p = BezierPath.cubicBezier(p0, p1, p2, p3, mu);
					g.addPoint(p);
					System.out.println(mu + " " + p);
				}
				p0 = p3;
			}
			ll = buckets.addLineBucket(1, new LineStyle(Color.CYAN, 2f));
			ll.addLine(g);

		}

		public synchronized void clear() {
			buckets.clear();
			setReady(false);
		}

		@Override
		public synchronized void update(GLViewport v) {

			if (mMapPosition.scale == 0)
				mMapPosition.copy(v.pos);

			if (!isReady()) {
				compile();
			}
		}
	}
}