2 * Jalview - A Sequence Alignment Editor and Viewer
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3 * Copyright (C) 2005 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle
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5 * This program is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU General Public License
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7 * as published by the Free Software Foundation; either version 2
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8 * of the License, or (at your option) any later version.
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program; if not, write to the Free Software
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17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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19 package jalview.math;
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21 public class RotatableMatrix {
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26 public RotatableMatrix(int rows, int cols) {
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27 matrix = new float[rows][cols];
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29 temp = new float[3];
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31 rot = new float[3][3];
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34 public void addElement(int i, int j, float value) {
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35 matrix[i][j] = value;
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38 public void print() {
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39 System.out.println(matrix[0][0] + " " + matrix[0][1] + " " +
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42 System.out.println(matrix[1][0] + " " + matrix[1][1] + " " +
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45 System.out.println(matrix[2][0] + " " + matrix[2][1] + " " +
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49 public void rotate(float degrees, char axis) {
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50 float costheta = (float) Math.cos((degrees * Math.PI) / (float) 180.0);
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52 float sintheta = (float) Math.sin((degrees * Math.PI) / (float) 180.0);
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55 rot[0][0] = (float) costheta;
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57 rot[0][1] = (float) -sintheta;
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59 rot[0][2] = (float) 0.0;
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61 rot[1][0] = (float) sintheta;
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63 rot[1][1] = (float) costheta;
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65 rot[1][2] = (float) 0.0;
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67 rot[2][0] = (float) 0.0;
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69 rot[2][1] = (float) 0.0;
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71 rot[2][2] = (float) 1.0;
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77 rot[0][0] = (float) 1.0;
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79 rot[0][1] = (float) 0.0;
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81 rot[0][2] = (float) 0.0;
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83 rot[1][0] = (float) 0.0;
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85 rot[1][1] = (float) costheta;
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87 rot[1][2] = (float) sintheta;
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89 rot[2][0] = (float) 0.0;
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91 rot[2][1] = (float) -sintheta;
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93 rot[2][2] = (float) costheta;
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99 rot[0][0] = (float) costheta;
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101 rot[0][1] = (float) 0.0;
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103 rot[0][2] = (float) -sintheta;
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105 rot[1][0] = (float) 0.0;
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107 rot[1][1] = (float) 1.0;
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109 rot[1][2] = (float) 0.0;
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111 rot[2][0] = (float) sintheta;
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113 rot[2][1] = (float) 0.0;
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115 rot[2][2] = (float) costheta;
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121 public float[] vectorMultiply(float[] vect) {
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128 for (int i = 0; i < 3; i++) {
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129 temp[i] = (matrix[i][0] * vect[0]) + (matrix[i][1] * vect[1]) +
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130 (matrix[i][2] * vect[2]);
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142 public void preMultiply(float[][] mat) {
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143 float[][] tmp = new float[3][3];
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145 for (int i = 0; i < 3; i++) {
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146 for (int j = 0; j < 3; j++) {
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147 tmp[i][j] = (mat[i][0] * matrix[0][j]) +
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148 (mat[i][1] * matrix[1][j]) + (mat[i][2] * matrix[2][j]);
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152 for (int i = 0; i < 3; i++) {
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153 for (int j = 0; j < 3; j++) {
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154 matrix[i][j] = tmp[i][j];
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159 public void postMultiply(float[][] mat) {
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160 float[][] tmp = new float[3][3];
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162 for (int i = 0; i < 3; i++) {
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163 for (int j = 0; j < 3; j++) {
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164 tmp[i][j] = (matrix[i][0] * mat[0][j]) +
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165 (matrix[i][1] * mat[1][j]) + (matrix[i][2] * mat[2][j]);
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169 for (int i = 0; i < 3; i++) {
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170 for (int j = 0; j < 3; j++) {
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171 matrix[i][j] = tmp[i][j];
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176 public static void main(String[] args) {
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177 RotatableMatrix m = new RotatableMatrix(3, 3);
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179 m.addElement(0, 0, 1);
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181 m.addElement(0, 1, 0);
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183 m.addElement(0, 2, 0);
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185 m.addElement(1, 0, 0);
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187 m.addElement(1, 1, 2);
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189 m.addElement(1, 2, 0);
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191 m.addElement(2, 0, 0);
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193 m.addElement(2, 1, 0);
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195 m.addElement(2, 2, 1);
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199 RotatableMatrix n = new RotatableMatrix(3, 3);
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201 n.addElement(0, 0, 2);
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203 n.addElement(0, 1, 1);
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205 n.addElement(0, 2, 1);
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207 n.addElement(1, 0, 2);
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209 n.addElement(1, 1, 1);
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211 n.addElement(1, 2, 1);
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213 n.addElement(2, 0, 2);
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215 n.addElement(2, 1, 1);
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217 n.addElement(2, 2, 1);
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221 //m.postMultiply(n.matrix);
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223 // m.rotate(45,'z',new RotatableMatrix(3,3));
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224 float[] vect = new float[3];
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232 vect = m.vectorMultiply(vect);
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234 System.out.println(vect[0] + " " + vect[1] + " " + vect[2]);
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237 public void setIdentity() {
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238 matrix[0][0] = (float) 1.0;
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240 matrix[1][1] = (float) 1.0;
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242 matrix[2][2] = (float) 1.0;
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244 matrix[0][1] = (float) 0.0;
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246 matrix[0][2] = (float) 0.0;
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248 matrix[1][0] = (float) 0.0;
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250 matrix[1][2] = (float) 0.0;
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252 matrix[2][0] = (float) 0.0;
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254 matrix[2][1] = (float) 0.0;
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