git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4477 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
17 years ago
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7f445f34a6
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// ymageOSM.java
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// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 12.02.2008 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.ymage;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import javax.imageio.ImageIO;
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import de.anomic.plasma.plasmaHTCache;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.yacy.yacyURL;
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public class ymageOSM {
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// helper methods to load map images from openstreetmap.org
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public static ymageMatrix getCombinedTiles(tileCoordinates t11) {
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tileCoordinates t00, t10, t20, t01, t21, t02, t12, t22;
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t00 = new tileCoordinates(t11.xtile - 1, t11.ytile - 1, t11.zoom);
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t10 = new tileCoordinates(t11.xtile , t11.ytile - 1, t11.zoom);
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t20 = new tileCoordinates(t11.xtile + 1, t11.ytile - 1, t11.zoom);
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t01 = new tileCoordinates(t11.xtile - 1, t11.ytile , t11.zoom);
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t21 = new tileCoordinates(t11.xtile + 1, t11.ytile , t11.zoom);
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t02 = new tileCoordinates(t11.xtile - 1, t11.ytile + 1, t11.zoom);
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t12 = new tileCoordinates(t11.xtile , t11.ytile + 1, t11.zoom);
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t22 = new tileCoordinates(t11.xtile + 1, t11.ytile + 1, t11.zoom);
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ymageMatrix m = new ymageMatrix(768, 768, ymageMatrix.MODE_REPLACE, "FFFFFF");
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BufferedImage bi;
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bi = getSingleTile(t00); if (bi != null) m.insertBitmap(getSingleTile(t00), 0, 0);
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bi = getSingleTile(t10); if (bi != null) m.insertBitmap(getSingleTile(t10), 256, 0);
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bi = getSingleTile(t20); if (bi != null) m.insertBitmap(getSingleTile(t20), 512, 0);
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bi = getSingleTile(t01); if (bi != null) m.insertBitmap(getSingleTile(t01), 0, 256);
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bi = getSingleTile(t11); if (bi != null) m.insertBitmap(getSingleTile(t11), 256, 256);
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bi = getSingleTile(t21); if (bi != null) m.insertBitmap(getSingleTile(t21), 512, 256);
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bi = getSingleTile(t02); if (bi != null) m.insertBitmap(getSingleTile(t02), 0, 512);
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bi = getSingleTile(t12); if (bi != null) m.insertBitmap(getSingleTile(t12), 256, 512);
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bi = getSingleTile(t22); if (bi != null) m.insertBitmap(getSingleTile(t22), 512, 512);
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return m;
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}
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public static BufferedImage getSingleTile(tileCoordinates tile) {
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yacyURL tileURL;
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try {
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tileURL = new yacyURL(tile.url(), null);
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} catch (MalformedURLException e) {
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return null;
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}
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System.out.println("*** DEBUG: fetching OSM tile: " + tileURL.toNormalform(true, true));
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InputStream tileStream = plasmaHTCache.getResourceContentStream(tileURL);
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if (tileStream == null) {
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// download resource using the crawler and keep resource in memory if possible
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plasmaHTCache.Entry entry = plasmaSwitchboard.getSwitchboard().crawlQueues.loadResourceFromWeb(tileURL, 20000, true, false);
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if ((entry == null) || (entry.cacheArray() == null)) return null;
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tileStream = new ByteArrayInputStream(entry.cacheArray());
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}
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try {
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return ImageIO.read(tileStream);
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} catch (IOException e) {
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return null;
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}
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}
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public static class tileCoordinates {
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int xtile, ytile, zoom;
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public tileCoordinates(final double lat, final double lon, final int zoom) {
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this.zoom = zoom;
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this.xtile = (int) Math.floor((lon + 180) / 360 * (1 << zoom));
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this.ytile = (int) Math.floor((1 - Math.log(Math.tan(lat * Math.PI / 180) + 1 / Math.cos(lat * Math.PI / 180)) / Math.PI) / 2 * (1 << zoom));
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}
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public tileCoordinates(int xtile, int ytile, int zoom) {
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this.zoom = zoom;
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this.xtile = xtile;
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this.ytile = ytile;
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}
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public String url() {
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return("http://tile.openstreetmap.org/" + zoom + "/" + xtile + "/" + ytile + ".png");
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}
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}
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}
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