Source Code Cross Referenced for Matrix.java in  » PDF » PDFBox-0.7.3 » org » pdfbox » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » PDF » PDFBox 0.7.3 » org.pdfbox.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Copyright (c) 2003, www.pdfbox.org
003:         * All rights reserved.
004:         *
005:         * Redistribution and use in source and binary forms, with or without
006:         * modification, are permitted provided that the following conditions are met:
007:         *
008:         * 1. Redistributions of source code must retain the above copyright notice,
009:         *    this list of conditions and the following disclaimer.
010:         * 2. Redistributions in binary form must reproduce the above copyright notice,
011:         *    this list of conditions and the following disclaimer in the documentation
012:         *    and/or other materials provided with the distribution.
013:         * 3. Neither the name of pdfbox; nor the names of its
014:         *    contributors may be used to endorse or promote products derived from this
015:         *    software without specific prior written permission.
016:         *
017:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
018:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
019:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
020:         * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
021:         * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
022:         * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
023:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
024:         * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
025:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
026:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
027:         *
028:         * http://www.pdfbox.org
029:         *
030:         */package org.pdfbox.util;
031:
032:        import java.awt.geom.AffineTransform;
033:
034:        /**
035:         * This class will be used for matrix manipulation.
036:         *
037:         * @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
038:         * @version $Revision: 1.14 $
039:         */
040:        public class Matrix implements  Cloneable {
041:            private float[] single = { 1, 0, 0, 0, 1, 0, 0, 0, 1 };
042:
043:            /**
044:             * Constructor.
045:             */
046:            public Matrix() {
047:                //default constructor
048:            }
049:
050:            /**
051:             * Create an affine transform from this matrix's values.
052:             * 
053:             * @return An affine transform with this matrix's values.
054:             */
055:            public AffineTransform createAffineTransform() {
056:                AffineTransform retval = new AffineTransform(single[0],
057:                        single[1], single[3], single[4], single[6], single[7]);
058:                return retval;
059:            }
060:
061:            /**
062:             * Set the values of the matrix from the AffineTransform.
063:             * 
064:             * @param af The transform to get the values from.
065:             */
066:            public void setFromAffineTransform(AffineTransform af) {
067:                single[0] = (float) af.getScaleX();
068:                single[1] = (float) af.getShearY();
069:                single[3] = (float) af.getShearX();
070:                single[4] = (float) af.getScaleY();
071:                single[6] = (float) af.getTranslateX();
072:                single[7] = (float) af.getTranslateY();
073:            }
074:
075:            /**
076:             * This will get a matrix value at some point.
077:             *
078:             * @param row The row to get the value from.
079:             * @param column The column to get the value from.
080:             *
081:             * @return The value at the row/column position.
082:             */
083:            public float getValue(int row, int column) {
084:                return single[row * 3 + column];
085:            }
086:
087:            /**
088:             * This will set a value at a position.
089:             *
090:             * @param row The row to set the value at.
091:             * @param column the column to set the value at.
092:             * @param value The value to set at the position.
093:             */
094:            public void setValue(int row, int column, float value) {
095:                single[row * 3 + column] = value;
096:            }
097:
098:            /**
099:             * Return a single dimension array of all values in the matrix.
100:             * 
101:             * @return The values ot this matrix.
102:             */
103:            public float[][] getValues() {
104:                float[][] retval = new float[3][3];
105:                retval[0][0] = single[0];
106:                retval[0][1] = single[1];
107:                retval[0][2] = single[2];
108:                retval[1][0] = single[3];
109:                retval[1][1] = single[4];
110:                retval[1][2] = single[5];
111:                retval[2][0] = single[6];
112:                retval[2][1] = single[7];
113:                retval[2][2] = single[8];
114:                return retval;
115:            }
116:
117:            /**
118:             * Return a single dimension array of all values in the matrix.
119:             * 
120:             * @return The values ot this matrix.
121:             */
122:            public double[][] getValuesAsDouble() {
123:                double[][] retval = new double[3][3];
124:                retval[0][0] = single[0];
125:                retval[0][1] = single[1];
126:                retval[0][2] = single[2];
127:                retval[1][0] = single[3];
128:                retval[1][1] = single[4];
129:                retval[1][2] = single[5];
130:                retval[2][0] = single[6];
131:                retval[2][1] = single[7];
132:                retval[2][2] = single[8];
133:                return retval;
134:            }
135:
136:            /**
137:             * This will take the current matrix and multipy it with a matrix that is passed in.
138:             *
139:             * @param b The matrix to multiply by.
140:             *
141:             * @return The result of the two multiplied matrices.
142:             */
143:            public Matrix multiply(Matrix b) {
144:                Matrix result = new Matrix();
145:
146:                float[] bMatrix = b.single;
147:                float[] resultMatrix = result.single;
148:                resultMatrix[0] = single[0] * bMatrix[0] + single[1]
149:                        * bMatrix[3] + single[2] * bMatrix[6];
150:                resultMatrix[1] = single[0] * bMatrix[1] + single[1]
151:                        * bMatrix[4] + single[2] * bMatrix[7];
152:                resultMatrix[2] = single[0] * bMatrix[2] + single[1]
153:                        * bMatrix[5] + single[2] * bMatrix[8];
154:                resultMatrix[3] = single[3] * bMatrix[0] + single[4]
155:                        * bMatrix[3] + single[5] * bMatrix[6];
156:                resultMatrix[4] = single[3] * bMatrix[1] + single[4]
157:                        * bMatrix[4] + single[5] * bMatrix[7];
158:                resultMatrix[5] = single[3] * bMatrix[2] + single[4]
159:                        * bMatrix[5] + single[5] * bMatrix[8];
160:                resultMatrix[6] = single[6] * bMatrix[0] + single[7]
161:                        * bMatrix[3] + single[8] * bMatrix[6];
162:                resultMatrix[7] = single[6] * bMatrix[1] + single[7]
163:                        * bMatrix[4] + single[8] * bMatrix[7];
164:                resultMatrix[8] = single[6] * bMatrix[2] + single[7]
165:                        * bMatrix[5] + single[8] * bMatrix[8];
166:
167:                return result;
168:            }
169:
170:            /**
171:             * Create a new matrix with just the scaling operators.
172:             * 
173:             * @return A new matrix with just the scaling operators.
174:             */
175:            public Matrix extractScaling() {
176:                Matrix retval = new Matrix();
177:
178:                retval.single[0] = this .single[0];
179:                retval.single[4] = this .single[4];
180:
181:                return retval;
182:            }
183:
184:            /**
185:             * Convenience method to create a scaled instance. 
186:             * 
187:             * @param x The xscale operator.
188:             * @param y The yscale operator.
189:             * @return A new matrix with just the x/y scaling
190:             */
191:            public static Matrix getScaleInstance(float x, float y) {
192:                Matrix retval = new Matrix();
193:
194:                retval.single[0] = x;
195:                retval.single[4] = y;
196:
197:                return retval;
198:            }
199:
200:            /**
201:             * Create a new matrix with just the translating operators.
202:             * 
203:             * @return A new matrix with just the translating operators.
204:             */
205:            public Matrix extractTranslating() {
206:                Matrix retval = new Matrix();
207:
208:                retval.single[6] = this .single[6];
209:                retval.single[7] = this .single[7];
210:
211:                return retval;
212:            }
213:
214:            /**
215:             * Convenience method to create a translating instance. 
216:             * 
217:             * @param x The x translating operator.
218:             * @param y The y translating operator.
219:             * @return A new matrix with just the x/y translating.
220:             */
221:            public static Matrix getTranslatingInstance(float x, float y) {
222:                Matrix retval = new Matrix();
223:
224:                retval.single[6] = x;
225:                retval.single[7] = y;
226:
227:                return retval;
228:            }
229:
230:            /**
231:             * Clones this object.
232:             * @return cloned matrix as an object.
233:             */
234:            public Object clone() {
235:                Matrix clone = new Matrix();
236:                System.arraycopy(single, 0, clone.single, 0, 9);
237:                return clone;
238:            }
239:
240:            /**
241:             * This will copy the text matrix data.
242:             *
243:             * @return a matrix that matches this one.
244:             */
245:            public Matrix copy() {
246:                return (Matrix) clone();
247:            }
248:
249:            /**
250:             * This will return a string representation of the matrix.
251:             *
252:             * @return The matrix as a string.
253:             */
254:            public String toString() {
255:                StringBuffer result = new StringBuffer("");
256:                result.append("[[");
257:                result.append(single[0] + ",");
258:                result.append(single[1] + ",");
259:                result.append(single[2] + "][");
260:                result.append(single[3] + ",");
261:                result.append(single[4] + ",");
262:                result.append(single[5] + "][");
263:                result.append(single[6] + ",");
264:                result.append(single[7] + ",");
265:                result.append(single[8] + "]]");
266:
267:                return result.toString();
268:            }
269:
270:            /**
271:             * Get the xscaling factor of this matrix.
272:             * @return The x-scale.
273:             */
274:            public float getXScale() {
275:                float xScale = single[0];
276:
277:                /**
278:                 * BM: if the trm is rotated, the calculation is a little more complicated 
279:                 * 
280:                 * The rotation matrix multiplied with the scaling matrix is:
281:                 * (   x   0   0)    ( cos  sin  0)    ( x*cos x*sin   0)
282:                 * (   0   y   0) *  (-sin  cos  0)  = (-y*sin y*cos   0)
283:                 * (   0   0   1)    (   0    0  1)    (     0     0   1)
284:                 *
285:                 * So, if you want to deduce x from the matrix you take
286:                 * M(0,0) = x*cos and M(0,1) = x*sin and use the theorem of Pythagoras
287:                 * 
288:                 * sqrt(M(0,0)^2+M(0,1)^2) =
289:                 * sqrt(x2*cos2+x2*sin2) =
290:                 * sqrt(x2*(cos2+sin2)) = <- here is the trick cos2+sin2 is one
291:                 * sqrt(x2) =
292:                 * abs(x) 
293:                 */
294:                if (!(single[1] == 0.0f && single[3] == 0.0f)) {
295:                    xScale = (float) Math.sqrt(Math.pow(single[0], 2)
296:                            + Math.pow(single[1], 2));
297:                }
298:                return xScale;
299:            }
300:
301:            /**
302:             * Get the y scaling factor of this matrix.
303:             * @return The y-scale factor.
304:             */
305:            public float getYScale() {
306:                float yScale = single[4];
307:                if (!(single[1] == 0.0f && single[3] == 0.0f)) {
308:                    yScale = (float) Math.sqrt(Math.pow(single[3], 2)
309:                            + Math.pow(single[4], 2));
310:                }
311:                return yScale;
312:            }
313:
314:            /**
315:             * Get the x position in the matrix.
316:             * @return The x-position.
317:             */
318:            public float getXPosition() {
319:                return single[6];
320:            }
321:
322:            /**
323:             * Get the y position.
324:             * @return The y position.
325:             */
326:            public float getYPosition() {
327:                return single[7];
328:            }
329:        }
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