Source Code Cross Referenced for Matrix2.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 java.io.Serializable;
021:import javax.vecmath.SingularMatrixException;
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:/**
032: * A matrix of fixed {@value #SIZE}×{@value #SIZE} size.
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/Matrix2.java $
036: * @version $Id: Matrix2.java 24493 2007-02-17 17:28:12Z desruisseaux $
037: * @author Martin Desruisseaux
038: */
039:public class Matrix2 implements  XMatrix, Serializable {
040:    /** Serial number for interoperability with different versions. */
041:    private static final long serialVersionUID = 7116561372481474290L;
042:
043:    /** The matrix size, which is {@value}. */
044:    public static final int SIZE = 2;
045:
046:    /** The first matrix element in the first row. */
047:    public double m00;
048:
049:    /** The second matrix element in the first row. */
050:    public double m01;
051:
052:    /** The first matrix element in the second row. */
053:    public double m10;
054:
055:    /** The second matrix element in the second row. */
056:    public double m11;
057:
058:    /**
059:     * Creates a new identity matrix.
060:     */
061:    public Matrix2() {
062:        m00 = m11 = 1;
063:    }
064:
065:    /**
066:     * Creates a new matrix initialized to the specified values.
067:     */
068:    public Matrix2(final double m00, final double m01,
069:                   final double m10, final double m11)
070:    {
071:        this .m00 = m00;
072:        this .m01 = m01;
073:        this .m10 = m10;
074:        this .m11 = m11;
075:    }
076:
077:    /**
078:     * Creates a new matrix initialized to the same value than the specified one.
079:     * The specified matrix size must be {@value #SIZE}×{@value #SIZE}.
080:     */
081:    public Matrix2(final Matrix matrix) {
082:        if (matrix.getNumRow()!=SIZE || matrix.getNumCol()!=SIZE) {
083:            throw new IllegalArgumentException(Errors.format(ErrorKeys.ILLEGAL_MATRIX_SIZE));
084:        }
085:        m00 = matrix.getElement(0,0);
086:        m01 = matrix.getElement(0,1);
087:        m10 = matrix.getElement(1,0);
088:        m11 = matrix.getElement(1,1);
089:    }
090:
091:    /**
092:     * Returns the number of rows in this matrix, which is always {@value #SIZE}
093:     * in this implementation.
094:     */
095:    public final int getNumRow() {
096:        return SIZE;
097:    }
098:
099:    /**
100:     * Returns the number of colmuns in this matrix, which is always {@value #SIZE}
101:     * in this implementation.
102:     */
103:    public final int getNumCol() {
104:        return SIZE;
105:    }
106:
107:    /**
108:     * {@inheritDoc}
109:     */
110:    public final double getElement(final int row, final int col) {
111:        switch (row) {
112:            case 0: {
113:                switch (col) {
114:                    case 0: return m00;
115:                    case 1: return m01;
116:                }
117:                break;
118:            }
119:            case 1: {
120:                switch (col) {
121:                    case 0: return m10;
122:                    case 1: return m11;
123:                }
124:                break;
125:            }
126:        }
127:        throw new IndexOutOfBoundsException();
128:    }
129:
130:    /**
131:     * {@inheritDoc}
132:     */
133:    public final void setElement(final int row, final int col, final double value) {
134:        switch (row) {
135:            case 0: {
136:                switch (col) {
137:                    case 0: m00 = value; return;
138:                    case 1: m01 = value; return;
139:                }
140:                break;
141:            }
142:            case 1: {
143:                switch (col) {
144:                    case 0: m10 = value; return;
145:                    case 1: m11 = value; return;
146:                }
147:                break;
148:            }
149:        }
150:        throw new IndexOutOfBoundsException();
151:    }
152:
153:    /**
154:     * {@inheritDoc}
155:     */
156:    public final void setZero() {
157:        m00 = m01 = m10 = m11 = 0;
158:    }
159:
160:    /**
161:     * {@inheritDoc}
162:     */
163:    public final void setIdentity() {
164:        m01 = m10 = 1;
165:        m00 = m11 = 1;
166:        assert isIdentity();
167:    }
168:
169:    /**
170:     * {@inheritDoc}
171:     */
172:    public final boolean isIdentity() {
173:        return m01==0 && m10==0 && m00==1 && m11==1;
174:    }
175:
176:    /**
177:     * {@inheritDoc}
178:     */
179:    public final boolean isIdentity(double tolerance) {
180:    	return GeneralMatrix.isIdentity(this , tolerance);
181:    }
182:
183:    /**
184:     * {@inheritDoc}
185:     */
186:    public final boolean isAffine() {
187:        return m10==0 && m11==1;
188:    }
189:
190:    /**
191:     * {@inheritDoc}
192:     */
193:    public final void negate() {
194:        m00 = -m00;
195:        m01 = -m01;
196:        m10 = -m10;
197:        m11 = -m11;
198:    }
199:
200:    /**
201:     * {@inheritDoc}
202:     */
203:    public final void transpose() {
204:        final double swap = m10;
205:        m10 = m01;
206:        m01 = swap;
207:    }
208:
209:    /**
210:     * Inverts this matrix in place.
211:     */
212:    public final void invert() {
213:        final double det = m00*m11 - m01*m10;
214:        if (det == 0) {
215:            throw new SingularMatrixException();
216:        }
217:        final double swap = m00;
218:        m00 =  m11 / det;
219:        m11 = swap / det;
220:        m10 = -m10 / det;
221:        m01 = -m01 / det;
222:    }
223:
224:    /**
225:     * {@inheritDoc}
226:     */
227:    public final void multiply(final Matrix matrix) {
228:        final Matrix2 k;
229:        if (matrix instanceof  Matrix2) {
230:            k = (Matrix2) matrix;
231:        } else {
232:            k = new Matrix2(matrix);
233:        }
234:        double m0, m1;
235:        m0=m00; m1=m01;
236:        m00 = m0*k.m00 + m1*k.m10;
237:        m01 = m0*k.m01 + m1*k.m11;
238:        m0=m10; m1=m11;
239:        m10 = m0*k.m00 + m1*k.m10;
240:        m11 = m0*k.m01 + m1*k.m11;
241:    }
242:
243:    /**
244:     * Returns {@code true} if the specified object is of type {@code Matrix2} and
245:     * all of the data members are equal to the corresponding data members in this matrix.
246:     */
247:    public boolean equals(final Object object) {
248:        if (object!=null && object.getClass().equals(getClass())) {
249:            final Matrix2 that = (Matrix2) object;
250:            return Double.doubleToLongBits(this .m00) == Double.doubleToLongBits(that.m00) &&
251:                   Double.doubleToLongBits(this .m01) == Double.doubleToLongBits(that.m01) &&
252:                   Double.doubleToLongBits(this .m10) == Double.doubleToLongBits(that.m10) &&
253:                   Double.doubleToLongBits(this .m11) == Double.doubleToLongBits(that.m11);
254:        }
255:        return false;
256:    }
257:
258:    /**
259:     * Returns a hash code value based on the data values in this object.
260:     */
261:    public int hashCode() {
262:        return (int)((((Double.doubleToLongBits(m00)  +
263:                     37*Double.doubleToLongBits(m01)) +
264:                     37*Double.doubleToLongBits(m10)) +
265:                     37*Double.doubleToLongBits(m11)) ^
266:                        serialVersionUID);
267:    }
268:    
269:    /**
270:     * Returns a string representation of this matrix. The returned string is implementation
271:     * dependent. It is usually provided for debugging purposes only.
272:     */
273:    public String toString() {
274:        return GeneralMatrix.toString(this );
275:    }
276:
277:    /**
278:     * Returns a clone of this matrix.
279:     */
280:    public Object clone() {
281:        try {
282:            return super .clone();
283:        } catch (CloneNotSupportedException e) {
284:            // Should not happen, since we are cloneable.
285:            throw new AssertionError(e);
286:        }
287:    }
288:}
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