| gvSIG desktop 1

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2005 IVER T.I. and Generalitat Valenciana.

 *

 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

*

* $Id: LinePlacementConstraints.java 11170 2007-04-12 16:01:32Z jaume $

* $Log$

* Revision 1.6  2007-04-12 16:01:11  jaume

* *** empty log message ***

*

* Revision 1.5  2007/04/12 14:28:43  jaume

* basic labeling support for lines

*

* Revision 1.4  2007/04/11 16:01:08  jaume

* maybe a label placer refactor

*

* Revision 1.3  2007/04/02 16:34:56  jaume

* Styled labeling (start commiting)

*

* Revision 1.2  2007/03/09 08:33:43  jaume

* *** empty log message ***

*

* Revision 1.1.2.1  2007/02/09 07:47:05  jaume

* Isymbol moved

*

*

*/

package com.iver.cit.gvsig.fmap.rendering.styling;

import java.awt.Graphics2D;

import java.awt.geom.AffineTransform;

import java.awt.geom.Point2D;

import java.awt.image.AffineTransformOp;

import org.apache.batik.ext.awt.geom.PathLength;

import org.cresques.px.gml.MultiPolygon;

import com.iver.cit.gvsig.fmap.core.FShape;

import com.iver.cit.gvsig.fmap.core.IGeometry;

/**

 *

 * @author jaume dominguez faus - jaume.dominguez@iver.es

 *

 */

public class LinePlacementConstraints extends AbstractPlacementConstraints {

        private static final double HALF_PI = Math.PI * 0.5;

        public FShape[] getLocationsFor(IGeometry geom, FShape labelShape, MultiPolygon exclusionZone) {

                return new FShape[] { (FShape) geom.getInternalShape() };

        }

        public void placeLabel(Graphics2D g, IGeometry geom, LabelClass lc, MultiPolygon exclusionZone, AffineTransform at, String[] labelTexts) {

                Point2D startingPoint = null;

                double rot = 0;

                if (isFollowingLine()) {

                        throw new Error("following line option not yet implemented");

                        // 1. create text path

                        // 2. convert text symbol to SmartTextSymbol if need

                } else {

                        PathLength pathLen = new PathLength(geom.getInternalShape());

                        float distance;

                        if (isAtTheBeginingOfLine()) {

                                distance = 0;

                        } else if (isAtTheEndOfLine()) {

                                distance = pathLen.lengthOfPath();

                        } else {

                                // will use in the middle of the line

                                distance = pathLen.lengthOfPath() * 0.5F;

                        }

                        startingPoint = pathLen.pointAtLength(distance);

                        if (isParallel()) {

                                // get the line theta and apply it

                                rot = pathLen.angleAtLength(distance);

                        } else if (isPerpendicular()) {

                                // get the line theta with 90 degrees

                                rot = pathLen.angleAtLength(distance) + HALF_PI;

                        }

                }

                /*

                 * Now we have the starting point for the text and the angle of

                 * the line in such point , we will apply the offset to place the

                 * text either over, under or above the line

                 */

                if (exclusionZone == null) {

                        // no check for overlapping is needed

                        if (isBellowTheLine()) {

                                // Offset to be on bellow of the line.

                        } else if (isAboveTheLine()) {

                                // Offset to be above the line (inverse offset to under the line)

                        } else {

                                // No offset.

                        }

                        /*

                         * Now, we'll need to see who is defining the orientation

                         * either the line or the page.

                         */

                        if (isPageOriented()) {

                        } else {

                                // The line defines the orientation.

                        }

                } else {

                        // the case of the process for look for a non-overlapping place

                        // will be better handled by a SmartLinePlacement

                        throw new Error("overlapping detection option not yet implemented");

                }

                AffineTransform old = g.getTransform();

                // g.transform(despla?ament, rotaci?, orientaci?)

                lc.drawInsideRectangle(g, lc.getShape(g, at, geom).getBounds());

                // g.transform(old)

        }

}