Source Code Cross Referenced for Matrix3.java in  » GIS » GeoTools-2.4.1 » org » geotools » referencing » operation » matrix » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.referencing.operation.matrix 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2005-2006, GeoTools Project Managment Committee (PMC)
005:         *    (C) 2005, Institut de Recherche pour le Développement
006:         *   
007:         *    This library is free software; you can redistribute it and/or
008:         *    modify it under the terms of the GNU Lesser General Public
009:         *    License as published by the Free Software Foundation;
010:         *    version 2.1 of the License.
011:         *
012:         *    This library is distributed in the hope that it will be useful,
013:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015:         *    Lesser General Public License for more details.
016:         */
017:        package org.geotools.referencing.operation.matrix;
018:
019:        // J2SE dependencies and extensions
020:        import javax.vecmath.Matrix3d;
021:        import java.awt.geom.AffineTransform;
022:
023:        // OpenGIS dependencies
024:        import org.opengis.referencing.operation.Matrix;
025:
026:        // Geotools dependencies
027:        import org.geotools.resources.i18n.Errors;
028:        import org.geotools.resources.i18n.ErrorKeys;
029:
030:        /**
031:         * A matrix of fixed {@value #SIZE}×{@value #SIZE} size. This specialized matrix provides
032:         * better accuracy than {@link GeneralMatrix} for matrix inversion and multiplication.
033:         *
034:         * @since 2.2
035:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/referencing/src/main/java/org/geotools/referencing/operation/matrix/Matrix3.java $
036:         * @version $Id: Matrix3.java 24493 2007-02-17 17:28:12Z desruisseaux $
037:         * @author Martin Desruisseaux
038:         */
039:        public class Matrix3 extends Matrix3d implements  XMatrix {
040:            /**
041:             * Serial number for interoperability with different versions.
042:             */
043:            private static final long serialVersionUID = 8902061778871586611L;
044:
045:            /**
046:             * The matrix size, which is {@value}.
047:             */
048:            public static final int SIZE = 3;
049:
050:            /**
051:             * Creates a new identity matrix.
052:             */
053:            public Matrix3() {
054:                setIdentity();
055:            }
056:
057:            /**
058:             * Creates a new matrix initialized to the specified values.
059:             */
060:            public Matrix3(double m00, double m01, double m02, double m10,
061:                    double m11, double m12, double m20, double m21, double m22) {
062:                super (m00, m01, m02, m10, m11, m12, m20, m21, m22);
063:            }
064:
065:            /**
066:             * Constructs a 3×3 matrix from the specified affine transform.
067:             */
068:            public Matrix3(final AffineTransform transform) {
069:                setMatrix(transform);
070:            }
071:
072:            /**
073:             * Creates a new matrix initialized to the same value than the specified one.
074:             * The specified matrix size must be {@value #SIZE}×{@value #SIZE}.
075:             */
076:            public Matrix3(final Matrix matrix) {
077:                if (matrix.getNumRow() != SIZE || matrix.getNumCol() != SIZE) {
078:                    throw new IllegalArgumentException(Errors
079:                            .format(ErrorKeys.ILLEGAL_MATRIX_SIZE));
080:                }
081:                for (int j = 0; j < SIZE; j++) {
082:                    for (int i = 0; i < SIZE; i++) {
083:                        setElement(j, i, matrix.getElement(j, i));
084:                    }
085:                }
086:            }
087:
088:            /**
089:             * Returns the number of rows in this matrix, which is always {@value #SIZE}
090:             * in this implementation.
091:             */
092:            public final int getNumRow() {
093:                return SIZE;
094:            }
095:
096:            /**
097:             * Returns the number of colmuns in this matrix, which is always {@value #SIZE}
098:             * in this implementation.
099:             */
100:            public final int getNumCol() {
101:                return SIZE;
102:            }
103:
104:            /**
105:             * {@inheritDoc}
106:             */
107:            public final boolean isIdentity() {
108:                for (int j = 0; j < SIZE; j++) {
109:                    for (int i = 0; i < SIZE; i++) {
110:                        if (getElement(j, i) != ((i == j) ? 1 : 0)) {
111:                            return false;
112:                        }
113:                    }
114:                }
115:                return true;
116:            }
117:
118:            /**
119:             * {@inheritDoc}
120:             */
121:            public final boolean isIdentity(double tolerance) {
122:                return GeneralMatrix.isIdentity(this , tolerance);
123:            }
124:
125:            /**
126:             * {@inheritDoc}
127:             */
128:            public final boolean isAffine() {
129:                return m20 == 0 && m21 == 0 && m22 == 1;
130:            }
131:
132:            /**
133:             * Returns {@code true} if at least one value is {@code NaN}.
134:             *
135:             * @since 2.3
136:             */
137:            public final boolean isNaN() {
138:                return Double.isNaN(m00) || Double.isNaN(m01)
139:                        || Double.isNaN(m02) || Double.isNaN(m10)
140:                        || Double.isNaN(m11) || Double.isNaN(m12)
141:                        || Double.isNaN(m20) || Double.isNaN(m21)
142:                        || Double.isNaN(m22);
143:            }
144:
145:            /**
146:             * {@inheritDoc}
147:             */
148:            public final void multiply(final Matrix matrix) {
149:                final Matrix3d m;
150:                if (matrix instanceof  Matrix3d) {
151:                    m = (Matrix3d) matrix;
152:                } else {
153:                    m = new Matrix3(matrix);
154:                }
155:                mul(m);
156:            }
157:
158:            /**
159:             * Sets this matrix to the specified affine transform.
160:             *
161:             * @since 2.3
162:             */
163:            public void setMatrix(final AffineTransform transform) {
164:                m00 = transform.getScaleX();
165:                m01 = transform.getShearX();
166:                m02 = transform.getTranslateX();
167:                m10 = transform.getShearY();
168:                m11 = transform.getScaleY();
169:                m12 = transform.getTranslateY();
170:                m20 = 0;
171:                m21 = 0;
172:                m22 = 1;
173:            }
174:
175:            /**
176:             * Returns {@code true} if this matrix is equals to the specified affine transform.
177:             *
178:             * @since 2.3
179:             */
180:            public boolean equalsAffine(final AffineTransform transform) {
181:                return m00 == transform.getScaleX()
182:                        && m01 == transform.getShearX()
183:                        && m02 == transform.getTranslateX()
184:                        && m10 == transform.getShearY()
185:                        && m11 == transform.getScaleY()
186:                        && m12 == transform.getTranslateY() && m20 == 0
187:                        && m21 == 0 && m22 == 1;
188:            }
189:
190:            /**
191:             * Returns a string representation of this matrix. The returned string is implementation
192:             * dependent. It is usually provided for debugging purposes only.
193:             */
194:            public String toString() {
195:                return GeneralMatrix.toString(this);
196:            }
197:        }
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