001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.math.geometry.point;
031
032import java.io.DataInput;
033import java.io.DataOutput;
034import java.io.IOException;
035import java.io.PrintWriter;
036import java.util.Scanner;
037
038import Jama.Matrix;
039
040/**
041 * Abstract base for {@link Point2d} implementations that retains the underlying
042 * precision.
043 * 
044 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
045 *
046 */
047public abstract class AbstractPoint2d implements Point2d {
048        @Override
049        public int getDimensions() {
050                return 2;
051        }
052
053        @Override
054        public boolean equals(Object o) {
055                if (!(o instanceof Point2d))
056                        return false;
057                final Point2d p = (Point2d) o;
058                return p.getOrdinate(0).equals(getOrdinate(0)) && p.getOrdinate(1).equals(getOrdinate(1));
059        }
060
061        @Override
062        public int hashCode() {
063                return toString().hashCode();
064        }
065
066        @Override
067        public void readASCII(Scanner in) throws IOException {
068                setOrdinate(0, in.nextDouble());
069                setOrdinate(1, in.nextDouble());
070        }
071
072        @Override
073        public String asciiHeader() {
074                return "Point2d";
075        }
076
077        @Override
078        public void readBinary(DataInput in) throws IOException {
079                setOrdinate(0, in.readDouble());
080                setOrdinate(1, in.readDouble());
081        }
082
083        @Override
084        public byte[] binaryHeader() {
085                return "PT2DD".getBytes();
086        }
087
088        @Override
089        public void writeASCII(PrintWriter out) throws IOException {
090                out.format("%f %f", getOrdinate(0).doubleValue(), getOrdinate(1).doubleValue());
091        }
092
093        @Override
094        public void writeBinary(DataOutput out) throws IOException {
095                out.writeDouble(getOrdinate(0).doubleValue());
096                out.writeDouble(getOrdinate(1).doubleValue());
097        }
098
099        @Override
100        public float getX() {
101                return getOrdinate(0).floatValue();
102        }
103
104        @Override
105        public void setX(float x) {
106                setOrdinate(0, x);
107        }
108
109        @Override
110        public float getY() {
111                return getOrdinate(1).floatValue();
112        }
113
114        @Override
115        public void setY(float y) {
116                setOrdinate(1, y);
117        }
118
119        @Override
120        public void copyFrom(Point2d p) {
121                setOrdinate(0, p.getOrdinate(0));
122                setOrdinate(1, p.getOrdinate(1));
123        }
124
125        @Override
126        public void translate(float x, float y) {
127                setOrdinate(0, getOrdinate(0).doubleValue() + x);
128                setOrdinate(0, getOrdinate(1).doubleValue() + y);
129        }
130
131        @Override
132        public Point2d transform(Matrix transform) {
133                double xt, yt, zt;
134                if (transform.getRowDimension() == 3) {
135                        xt = transform.get(0, 0) * getX() + transform.get(0, 1) * getY()
136                                        + transform.get(0, 2);
137                        yt = transform.get(1, 0) * getX() + transform.get(1, 1) * getY()
138                                        + transform.get(1, 2);
139                        zt = transform.get(2, 0) * getX() + transform.get(2, 1) * getY()
140                                        + transform.get(2, 2);
141
142                        xt /= zt;
143                        yt /= zt;
144                } else if (transform.getRowDimension() == 2 && transform.getColumnDimension() == 2) {
145                        xt = transform.get(0, 0) * getX() + transform.get(0, 1) * getY();
146                        yt = transform.get(1, 0) * getX() + transform.get(1, 1) * getY();
147                } else if (transform.getRowDimension() == 2 && transform.getColumnDimension() == 3) {
148                        xt = transform.get(0, 0) * getX() + transform.get(0, 1) * getY() + transform.get(0, 2);
149                        yt = transform.get(1, 0) * getX() + transform.get(1, 1) * getY() + transform.get(1, 2);
150                } else {
151                        throw new IllegalArgumentException("Transform matrix has unexpected size");
152                }
153
154                final Point2d cpy = copy();
155                cpy.setOrdinate(0, xt);
156                cpy.setOrdinate(1, yt);
157                return cpy;
158        }
159
160        @Override
161        public Point2d minus(Point2d a) {
162                final Point2d cpy = copy();
163                cpy.setOrdinate(0, getOrdinate(0).doubleValue() - a.getOrdinate(0).doubleValue());
164                cpy.setOrdinate(1, getOrdinate(1).doubleValue() - a.getOrdinate(1).doubleValue());
165                return cpy;
166        }
167
168        @Override
169        public void translate(Point2d v) {
170                setOrdinate(0, getOrdinate(0).doubleValue() + v.getOrdinate(0).doubleValue());
171                setOrdinate(1, getOrdinate(1).doubleValue() + v.getOrdinate(1).doubleValue());
172        }
173}