org.jdesktop.swingx.mapviewer.bmng.CylindricalProjectionTileFactory Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jxmapviewer2 Show documentation

This project is based on the JXMapViewer component of SwingX-WS.

The newest version!


package org.jdesktop.swingx.mapviewer.bmng;

import java.awt.Dimension;
import java.awt.geom.Point2D;

import org.jdesktop.swingx.mapviewer.DefaultTileFactory;
import org.jdesktop.swingx.mapviewer.GeoPosition;

/**
 * @author joshy
 */
public class CylindricalProjectionTileFactory extends DefaultTileFactory
{
	/**
     * Uses {@link SLMapServerInfo}
     */
	public CylindricalProjectionTileFactory()
	{
		this(new SLMapServerInfo());
	}

	/**
	 * @param info the tile factory info
	 */
	public CylindricalProjectionTileFactory(SLMapServerInfo info)
	{
		super(info);
	}

	@Override
	public Dimension getMapSize(int zoom)
	{
		int midpoint = ((SLMapServerInfo) getInfo()).getMidpoint();
		if (zoom < midpoint)
		{
			int w = (int) Math.pow(2, midpoint - zoom);
			return new Dimension(w, w / 2);
			// return super.getMapSize(zoom);
		}
		return new Dimension(2, 1);
	}

	@Override
	public Point2D geoToPixel(GeoPosition c, int zoom)
	{
		// calc the pixels per degree
		Dimension mapSizeInTiles = getMapSize(zoom);
		// double size_in_tiles = (double)getInfo().getMapWidthInTilesAtZoom(zoom);
		// double size_in_tiles = Math.pow(2, getInfo().getTotalMapZoom() - zoom);
		double size_in_pixels = mapSizeInTiles.getWidth() * getInfo().getTileSize(zoom);
		double ppd = size_in_pixels / 360;

		// the center of the world
		double centerX = this.getTileSize(zoom) * mapSizeInTiles.getWidth() / 2;
		double centerY = this.getTileSize(zoom) * mapSizeInTiles.getHeight() / 2;

		double x = c.getLongitude() * ppd + centerX;
		double y = -c.getLatitude() * ppd + centerY;

		return new Point2D.Double(x, y);
	}

	@Override
	public GeoPosition pixelToGeo(Point2D pix, int zoom)
	{
		// calc the pixels per degree
		Dimension mapSizeInTiles = getMapSize(zoom);
		double size_in_pixels = mapSizeInTiles.getWidth() * getInfo().getTileSize(zoom);
		double ppd = size_in_pixels / 360;

		// the center of the world
		double centerX = this.getTileSize(zoom) * mapSizeInTiles.getWidth() / 2;
		double centerY = this.getTileSize(zoom) * mapSizeInTiles.getHeight() / 2;

		double lon = (pix.getX() - centerX) / ppd;
		double lat = -(pix.getY() - centerY) / ppd;

		return new GeoPosition(lat, lon);
	}

	/*
	 * x = lat * ppd + fact x - fact = lat * ppd (x - fact)/ppd = lat y = -lat*ppd + fact -(y-fact)/ppd = lat
	 */
}