org.jxmapviewer.viewer.bmng.CylindricalProjectionTileFactory Maven / Gradle / Ivy

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A MapViewer based on the JXMapViewer component of SwingX-WS.

There is a newer version: 2.8


package org.jxmapviewer.viewer.bmng;

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

import org.jxmapviewer.viewer.DefaultTileFactory;
import org.jxmapviewer.viewer.GeoPosition;
import org.jxmapviewer.viewer.TileFactoryInfo;

/**
 * @author joshy
 */
public class CylindricalProjectionTileFactory extends DefaultTileFactory
{
    /**
     * @param info the tile factory info
     */
    public CylindricalProjectionTileFactory(TileFactoryInfo info)
    {
        super(info);
    }

    @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
     */
}