Application: gvSIG desktop

/*******************************************************************************

    GridExtent.java

    Copyright (C) Victor Olaya

    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

*******************************************************************************/

package org.gvsig.raster.grid;

import java.awt.geom.Point2D;

import org.gvsig.raster.datastruct.Extent;

/**

 * This class defines a grid system (coordinates and cellsize)

 * @author Victor Olaya (volaya@ya.com)

 */

public class GridExtent extends Extent{

        double cellSize = 1;

        int m_iNX;

        int m_iNY;

        public GridExtent(){}

        /**

         * Assign the extension value and cell size.

         * @param minX minimun value in X coordinate

         * @param minY minimun value in Y coordinate

         * @param maxX maximun value in X coordinate

         * @param maxY maximun value in Y coordinate

         * @param dCellSize cell size

         */

        public GridExtent(double minX, double minY, double maxX,

                                        double maxY, double dCellSize){

                super(minX, minY, maxX, maxY);

                this.cellSize = dCellSize;

                recalculateNXAndNY();

        }

        /**

         * Assign the extension value and cell size.

         * @param minX minimun value in X coordinate

         * @param minY minimun value in Y coordinate

         * @param maxX maximun value in X coordinate

         * @param maxY maximun value in Y coordinate

         * @param dCellSize cell size

         */

        public GridExtent(Extent extent, double dCellSize){

                super(extent);

                this.cellSize = dCellSize;

                recalculateNXAndNY();

        }

        public void setXRange(double dXMin, double dXMax){

                getMin().setLocation(Math.min(dXMin, dXMax), minY());

                getMax().setLocation(Math.max(dXMin, dXMax), maxY());

                recalculateNXAndNY();

        }

        public void setYRange(double dYMin, double dYMax){

                getMin().setLocation(minX(), Math.min(dYMin, dYMax));

                getMax().setLocation(maxX(), Math.max(dYMin, dYMax));

                recalculateNXAndNY();

        }

        /**

         * Get cell size

         * @return cell size in double value

         */

        public double getCellSize() {

                return cellSize;

        }

        /**

         * Set cell size and recalculate pixel distance in both axis

         * @param cellSize cell size in double value

         */

        public void setCellSize(double cellSize) {

                this.cellSize = cellSize;

                recalculateNXAndNY();

        }

        /**

         * Get pixel width

         * @return A integer with the pixel width value

         */

        public int getNX() {

                return m_iNX;

        }

        /**

         * Get pixel height

         * @return A integer with the pixel height value

         */

        public int getNY() {

                return m_iNY;

        }

        /**

         * Calculates pixel width and pixel height

         */

        private void recalculateNXAndNY(){

                m_iNY = (int) Math.floor((maxY() - minY()) / cellSize);

                m_iNX = (int) Math.floor((maxX() - minX()) / cellSize);

        }

        public boolean contains(double x, double y){

                return (x >= minX() && x <= maxX() && y >= minY() && y <= maxY());

        }

        public boolean fitsIn(GridExtent extent){

                boolean bFitsX, bFitsY;

                double dOffset;

                double dOffsetCols;

                double dOffsetRows;

                if (extent.getCellSize() != this.getCellSize()){

                        return false;

                }

                dOffset = Math.abs(extent.minX() - minX());

                dOffsetCols = dOffset / getCellSize();

                bFitsX = (dOffsetCols == Math.floor(dOffsetCols));

                dOffset = Math.abs(extent.maxY() - maxY());

                dOffsetRows = dOffset / getCellSize();

                bFitsY = (dOffsetRows == Math.floor(dOffsetRows));

                return bFitsX && bFitsY;

        }

        /**

         * Compare a extent with the current GridExtent

         * @param extent extent to compare

         * @return true if two extents are equals and false if not

         */

        public boolean equals(GridExtent extent){

                return         (minX() == extent.minX() &&

                                 maxX() == extent.maxX() &&

                                 minY() == extent.minY() &&

                                 maxY() == extent.maxY() &&

                                 cellSize == extent.getCellSize());

        }

        /**

         * Add the layer extent as current extent

         * @param layer Layer to set the extent

         */

        /*public void addRasterLayerToExtent(FLyrRaster layer){

                getMin().setLocation(Math.min(layer.getMinX(), minX()), Math.min(layer.getMinY(), minY()));

                getMax().setLocation(Math.max(layer.getMaxX(), maxX()), Math.max(layer.getMaxY(), maxY()));

                cellSize = Math.min(layer.getGrid().getXCellSize(), cellSize);

                recalculateNXAndNY();

        }*/

        public GridCell getGridCoordsFromWorldCoords(Point2D pt){

                int x = (int)Math.floor((pt.getX() - minX()) / cellSize);

                int y = (int)Math.ceil((maxY() - pt.getY()) / cellSize);

                GridCell cell = new GridCell(x, y, 0.0);

                return cell;

        }

        public Point2D getWorldCoordsFromGridCoords(GridCell cell){

                double x = minX() + (cell.getX() + 0.5) * cellSize;

                double y = maxY() - (cell.getY() + 0.5) * cellSize;

                Point2D pt = new Point2D.Double(x, y);

                return pt;

        }

}