95 lines
2.9 KiB
Java
95 lines
2.9 KiB
Java
/*
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Reversound is used to get the music sheet of a piece from a music file.
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Copyright (C) 2014 Gabriel AUGENDRE
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Copyright (C) 2014 Gabriel DIENY
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Copyright (C) 2014 Arthur GAUCHER
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Copyright (C) 2014 Gabriel LEPETIT-AIMON
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package conteneurs;
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import java.util.ArrayList;
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/**
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* Created by Gabriel on 26/03/2014.
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* Crée une gamme avec des fréquences régulièrement réparties (intervalle constant entre 2 fréquences
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*/
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public class RegularGamme extends Gamme{
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private final float startFreq;
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private final float step;
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private final int lengthGamme;
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public RegularGamme(float startFreq, int lengthGamme, float step) {
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this.startFreq = startFreq;
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this.lengthGamme = lengthGamme;
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this.step = step;
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}
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public RegularGamme(float startFreq, float endFreq, int nbrPoint){
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this(startFreq, nbrPoint, (endFreq-startFreq)/(float)nbrPoint);
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}
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/** Renvoie l'indice de la fréquence la plus proche si on tombe dessus,
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* sinon renvoie une ArrayList contenant l'indice précedent, l'indice suivant et un coefficient pour situer la note entre les 2. */
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public ArrayList<Number> getIndex(float freq) {
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if(freq > this.getEndFreq()){
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ArrayList<Number> res = new ArrayList<>();
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res.add(-1);
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return res;
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} else if( (freq-this.startFreq)%this.step == 0 ){
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ArrayList<Number> res = new ArrayList<>();
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res.add(Math.round(freq-this.startFreq)/step);
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return res;
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} else {
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int indexPrec = (int)Math.floor((freq-this.startFreq)/this.step);
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float coeff = (freq - this.getFreq(indexPrec))/ this.step;
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ArrayList<Number> res = new ArrayList<>();
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res.add(indexPrec);
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res.add(indexPrec+1);
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res.add(coeff);
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return res;
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}
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}
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/** Renvoie la fréquence associée à un indice donne en paramètre */
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public float getFreq(int index) {
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if(index < this.lengthGamme) {
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return this.startFreq + index * this.step;
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}
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return -1;
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}
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/** Renvoie le nombre de fréquences contenues dans la gamme */
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public int gammeSize() {
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return this.lengthGamme;
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}
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/** Renvoie la fréquence de début: par défaut c'est 0 */
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public float getStartFreq() {
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return this.startFreq;
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}
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/** Renvoie la fréquence maximale de la gamme */
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float getEndFreq() {
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return (this.lengthGamme-1)*this.step + this.startFreq;
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}
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public float getStep() {
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return this.step;
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}
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}
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