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

 *

 * Copyright (C) 2004 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

 */

package org.gvsig.app.project.documents.view.toolListeners.snapping.snappers;

import java.awt.Color;

import java.awt.geom.Point2D;

import java.awt.image.BufferedImage;

import java.awt.image.ColorModel;

import org.gvsig.fmap.mapcontext.ViewPort;

import org.gvsig.fmap.mapcontrol.PrimitivesDrawer;

import org.gvsig.fmap.mapcontrol.MapControl;

import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapperRaster;

import org.gvsig.fmap.mapcontrol.tools.snapping.snappers.impl.AbstractSnapper;

import com.vividsolutions.jts.geom.Coordinate;

public class PixelSnapper extends AbstractSnapper implements ISnapperRaster {

        private Color refColor = Color.BLACK;

        private int tolColorR = 100;

        private int tolColorG = 100;

        private int tolColorB = 100;

        /* (non-Javadoc)

         * @see com.iver.cit.gvsig.gui.cad.snapping.ISnapperRaster#getSnapPoint(java.awt.image.BufferedImage, java.awt.geom.Point2D, double, java.awt.geom.Point2D)

         */

        public Point2D getSnapPoint(MapControl mapControl, Point2D point,

                        double mapTolerance, Point2D lastPoint) {

                // Miramos dentro del rect?ngulo que define la tolerancia

                // y nos quedamos con el pixel que m?s se acerca al que buscamos

                BufferedImage img = mapControl.getImage();

                ViewPort vp = mapControl.getViewPort();

                Point2D pPixel = vp.fromMapPoint(point);

                int xPixel = (int) pPixel.getX();

                int yPixel = (int) pPixel.getY();

//                int centerRGB = img.getRGB(xPixel, yPixel);

                int centerRGB = refColor.getRGB();

                double x1 = ColorModel.getRGBdefault().getRed(centerRGB);

                double y1 = ColorModel.getRGBdefault().getGreen(centerRGB);

                double z1 = ColorModel.getRGBdefault().getBlue(centerRGB);

                Coordinate c = new Coordinate(x1, y1, z1);

                int half = vp.fromMapDistance(mapTolerance) / 2;

                double minDistColor = Double.MAX_VALUE;

                int xSnapped = -1;

                int ySnapped = -1;

                int fromX =xPixel -half;

                if (fromX <0) fromX = 0;

                int fromY =yPixel -half;

                if (fromY <0) fromY = 0;

                int toX =xPixel + half;

                if (toX > vp.getImageWidth()) toX = vp.getImageWidth();

                int toY =yPixel + half;

                if (toY > vp.getImageHeight()) toY = vp.getImageHeight();

                for (int testX= fromX; testX< toX; testX++)

                {

                        for (int testY= fromY; testY< toY; testY++)

                        {

                                // System.out.println("Testing: " + testX + ", " + testY);

                                int testRGB = img.getRGB(testX, testY);

                                // TODO: Aqu? deber?amos trabajar con un ColorSpace y usar toCIEXYZ. Por ahora lo calculo con RGB.

                                int r = ColorModel.getRGBdefault().getRed(testRGB);

                                int g = ColorModel.getRGBdefault().getGreen(testRGB);

                                int b = ColorModel.getRGBdefault().getBlue(testRGB);

                                Coordinate cAux = new Coordinate(r, g, b);

                                if (Math.abs(r-x1) < tolColorR)

                                        if (Math.abs(g-y1) < tolColorG)

                                                if (Math.abs(b-z1) < tolColorB)

                                                {

                                                        double dist = c.distance(cAux);

                                                        if (dist < minDistColor)

                                                        {

                                                                minDistColor = dist;

                                                                xSnapped = testX;

                                                                ySnapped = testY;

                                                        }

                                                }

                        }

                }

                Point2D pResul = null;

                if (xSnapped != -1)

                {

                        pResul = vp.toMapPoint(xSnapped, ySnapped);

                }

                return pResul;

        }

        /*

         * (non-Javadoc)

         * @see org.gvsig.fmap.mapcontrol.tools.snapping.snappers.ISnapper#draw(org.gvsig.fmap.mapcontrol.PrimitivesDrawer, java.awt.geom.Point2D)

         */

        public void draw(PrimitivesDrawer primitivesDrawer, Point2D pPixels) {

                primitivesDrawer.setColor(getColor());

                int half = getSizePixels() / 2;

                primitivesDrawer.drawOval((int) (pPixels.getX() - half),

                                (int) (pPixels.getY() - half),

                                getSizePixels(), getSizePixels());

        }

        public String getToolTipText() {

                return "pixel_point";

        }

}