Java tutorial
/* * Java Terrain and Stellar System Ports * * Copyright (C) 2006 Martin H. Smith based on work by original * authors. * * Released under the terms of the GNU General Public License * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. * * Linking TerraJ statically or dynamically with other modules is making a * combined work based on TerraJ. Thus, the terms and conditions of the * GNU General Public License cover the whole combination. * * In addition, as a special exception, the copyright holders of TerraJ * give you permission to combine this program with free software programs * or libraries that are released under the GNU LGPL and with code included * in the standard release of JOGL, Java Getopt and FreeMarker under the BSD * license (or modified versions of such code, with unchanged license) and with * Apache Commons and Log4J libraries under the Apache license (or modified versions * of such code. You may copy and distribute such a system following the terms * of the GNU GPL for TerraJ and the licenses of the other code concerned, * provided that you include the source code of that other code when and as the * GNU GPL requires distribution of source code. * * Note that people who make modified versions of TerraJ are not obligated to grant * this special exception for their modified versions; it is their choice whether * to do so. The GNU General Public License gives permission to release a modified * version without this exception; this exception also makes it possible to release * a modified version which carries forward this exception. */ /* * MercatorProjection.java * * Created on December 23, 2005, 3:02 PM * */ package com.alvermont.terraj.planet.project; import com.alvermont.terraj.planet.AllPlanetParameters; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * Does a mercator projection based on the generated planet * * @author martin * @version $Id: MercatorProjection.java,v 1.8 2006/07/06 06:58:34 martin Exp $ */ public class MercatorProjection extends AbstractProjector implements Projector { /** Our logging object */ private static Log log = LogFactory.getLog(MercatorProjection.class); /** Creates a new instance of MercatorProjection */ public MercatorProjection() { } /** * Creates a new instance of MercatorProjection * * @param params The parameters to be used */ public MercatorProjection(AllPlanetParameters params) { super(params); } /** * Carry out the projection */ public void project() { setcolours(); final int width = getParameters().getProjectionParameters().getWidth(); final int height = getParameters().getProjectionParameters().getHeight(); final double lat = getParameters().getProjectionParameters().getLatitudeRadians(); final double lon = getParameters().getProjectionParameters().getLongitudeRadians(); final double scale = getParameters().getProjectionParameters().getScale(); final double hgrid = getParameters().getProjectionParameters().getHgrid(); final double vgrid = getParameters().getProjectionParameters().getVgrid(); final boolean doShade = getParameters().getProjectionParameters().isDoShade(); cacheParameters(); colours = new short[width][height]; shades = new short[width][height]; double y; double scale1; double cos2; double theta1; int i; int j; int k; y = Math.sin(lat); y = (1.0 + y) / (1.0 - y); y = 0.5 * Math.log(y); k = (int) ((0.5 * y * width * scale) / Math.PI); progress.progressStart(height, "Generating Terrain"); for (j = 0; j < height; ++j) { // if (debug && ((j % (Height/25)) == 0)) // {fprintf(stderr, "%c", view); fflush(stderr);} progress.progressStep(j); y = (Math.PI * ((2.0 * (j - k)) - height)) / width / scale; y = Math.exp(2. * y); y = (y - 1.) / (y + 1.); scale1 = (scale * width) / height / Math.sqrt(1.0 - (y * y)) / Math.PI; cos2 = Math.sqrt(1.0 - (y * y)); depth = (3 * ((int) (log2(scale1 * height)))) + 3; for (i = 0; i < width; ++i) { theta1 = lon - (0.5 * Math.PI) + ((Math.PI * ((2.0 * i) - width)) / width / scale); colours[i][j] = (short) planet0(Math.cos(theta1) * cos2, y, -Math.sin(theta1) * cos2); if (doShade) { shades[i][j] = shade; } } } progress.progressComplete("Terrain Generated"); if (hgrid != 0.0) { /* draw horizontal gridlines */ for (theta1 = 0.0; theta1 > -90.0; theta1 -= hgrid) ; for (theta1 = theta1; theta1 < 90.0; theta1 += hgrid) { y = Math.sin(Math.toRadians(theta1)); y = (1.0 + y) / (1.0 - y); y = 0.5 * Math.log(y); j = (height / 2) + (int) ((0.5 * y * width * scale) / Math.PI) + k; if ((j >= 0) && (j < height)) { for (i = 0; i < width; ++i) colours[i][j] = BLACK; } } } if (vgrid != 0.0) { /* draw vertical gridlines */ for (theta1 = 0.0; theta1 > -360.0; theta1 -= vgrid) ; for (theta1 = theta1; theta1 < 360.0; theta1 += vgrid) { i = (int) (0.5 * width * (1.0 + ((scale * (Math.toRadians(theta1) - lon)) / Math.PI))); if ((i >= 0) && (i < width)) { for (j = 0; j < height; ++j) colours[i][j] = BLACK; } } } if (doShade) { smoothshades(); } } /** * Returns a string representation of the object. In general, the * <code>toString</code> method returns a string that * "textually represents" this object. The result should * be a concise but informative representation that is easy for a * person to read. * It is recommended that all subclasses override this method. * <p> * The <code>toString</code> method for class <code>Object</code> * returns a string consisting of the name of the class of which the * object is an instance, the at-sign character `<code>@</code>', and * the unsigned hexadecimal representation of the hash code of the * object. In other words, this method returns a string equal to the * value of: * <blockquote> * <pre> * getClass().getName() + '@' + Integer.toHexString(hashCode()) * </pre></blockquote> * * * @return a string representation of the object. */ public String toString() { return "Mercator Projection"; } /** * Get the name of the thumbnail image to use for this projection * * @return The name of the thumbmail image */ public String getThumbnailName() { return "t_mercator"; } }