Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * 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 3

 * 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.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.labeling.placements;

import java.awt.geom.Point2D;

import java.awt.geom.Rectangle2D;

import java.util.ArrayList;

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

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.mapcontext.ViewPort;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.ILabelClass;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.IPlacementConstraints;

import org.gvsig.symbology.fmap.mapcontext.rendering.legend.styling.LabelLocationMetrics;

import org.gvsig.tools.task.Cancellable;

public abstract class AbstractLinePlacement implements ILabelPlacement {

        public static final double PI = Math.PI;

        public static final double HALF_PI = PI * 0.5;

        private final ArrayList<LabelLocationMetrics> guessed =

                        new ArrayList<>();

        private static final double TOLERANCE = 1E-2;

    @Override

        public ArrayList<LabelLocationMetrics> guess(ILabelClass lc, Geometry geom,

                        IPlacementConstraints pc, double cartographicSymbolSize,

                        Cancellable cancel, ViewPort vp) {

                guessed.clear();

                Geometry shp = geom.cloneGeometry();

                shp.transform(vp.getAffineTransform());

                PathLength pathLen = new PathLength(shp);

                LabelLocationMetrics initial = initialLocation(lc, pc, pathLen, cancel);

                if (cancel.isCanceled()) {

            return CannotPlaceLabel.NO_PLACES;

        }

                double theta = initial.getRotation();

                double xOffset = 0;

                double yOffset = 0;

                Rectangle2D bounds = lc.getBounds();

                if (pc.isPageOriented()) {

                        if(theta >  HALF_PI) { // from origin to left-down

                                theta = (theta - Math.PI);

                                Point2D anchor = initial.getAnchor();

                                double cosTheta = Math.cos(theta);

                                double sinTheta = Math.sin(theta);

                                double width = bounds.getWidth();

                                double height = bounds.getHeight()*1.1;

                initial.getAnchor().setLocation(

                    anchor.getX() - cosTheta*width + sinTheta*height,

                    anchor.getY() - sinTheta*width - cosTheta*height);

                        } else if (theta < -HALF_PI ) { // from origin to left-up

                            /*

                                if (Math.abs(Math.abs(theta) - HALF_PI) -TOLERANCE > 0)

                                        // the condition avoids errors when segment is almost up-down vertical

                                {

                                */

                                        theta = (theta + Math.PI);

                                        Point2D anchor = initial.getAnchor();

                                        double cosTheta = Math.cos(theta);

                                        double sinTheta = Math.sin(theta);

                                        double width = bounds.getWidth();

                                        double height = bounds.getHeight()*1.1;

                                        initial.getAnchor().setLocation(

                                                        anchor.getX() - cosTheta*width + sinTheta*height,

                                                        anchor.getY() - sinTheta*width - cosTheta*height);

                                // }

                        }

                }

                if (pc.isBelowTheLine() ||

                                pc.isOnTheLine() ||

                                pc.isAboveTheLine()) {

                        double h = bounds.getHeight()*0.5;

                        xOffset += h * Math.sin(theta);

                        yOffset += h * Math.cos(theta);

                        Point2D initialAnchor = initial.getAnchor();

                        // calculate the possibles in the inverse

                        // order to the preferred order and add it

                        // always in the first position

                        if (pc.isBelowTheLine()) {

                                Point2D anchor = new Point2D.Double(

                                                initialAnchor.getX() +        -xOffset,

                                                initialAnchor.getY() +        +yOffset);

                                guessed.add(0, new LabelLocationMetrics(anchor, theta, false));

                        }

                        if (pc.isOnTheLine()) {

                                guessed.add(0, new LabelLocationMetrics(initial.getAnchor(), theta, false));

                        }

                        if (pc.isAboveTheLine()) {

                                Point2D anchor = new Point2D.Double(

                                                initialAnchor.getX() +        +xOffset,

                                                initialAnchor.getY() +  -yOffset);

                                guessed.add(0, new LabelLocationMetrics(anchor, theta, false));

                        }

                } else {

                        // will say that on the line is legal

                        guessed.add(0, initial);

                }

                return guessed;

        }

        abstract LabelLocationMetrics initialLocation(

                        ILabelClass lc, IPlacementConstraints pc,

                        PathLength pathLen, Cancellable cancel);

}