svn-gvsig-desktop / trunk / extensions / extGeoreferencing / src / org / gvsig / georeferencing / utils / MathUtils.java @ 5550
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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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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*
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*/
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package org.gvsig.georeferencing.utils; |
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import java.awt.geom.Rectangle2D; |
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import org.cresques.cts.IProjection; |
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import org.cresques.io.GeoRasterFile; |
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import org.cresques.px.Extent; |
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import com.iver.cit.gvsig.fmap.ViewPort; |
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public class MathUtils { |
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public static double INCHESMTR = 39.73007874D; |
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public static double INCHESCM = 0.3973007874D; |
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public static double INCHESMM = 0.03973007874D; |
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public static double MTRSINCH = 0.0254D; |
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public static double MMSINCH = 25.4D; |
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public static double CMSINCH = 2.54D; |
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/**
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* Recorta el n?mero de decimales a n del n?mero pasado por par?metro
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* @param num Valor a recortar el n?mero de decimales
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* @param n N?mero de decimales a recortar
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* @return N?mero recortado
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*/
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public static double tailDecimals(double num, int n){ |
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long m = (long)Math.pow(10, n); |
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num *= m; |
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long aux = ((long)num); |
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num = (double)((double)aux / (double)m); |
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return num;
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} |
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/**
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* Recorta el n?mero de decimales a n del n?mero pasado por par?metro
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* @param num Valor a recortar el n?mero de decimales
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* @param n N?mero de decimales a recortar
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* @return N?mero recortado
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*/
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public static String tailDecimals(String num, int n){ |
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int index = num.indexOf("."); |
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if(index != -1){ |
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try{
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num = num.substring(0, index + n);
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}catch(IndexOutOfBoundsException e){ |
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//No hacemos nada pq retornar? num
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} |
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} |
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return num;
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} |
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/**
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* Convierte pixels en milimetros dependiendo del los puntos por pulgada
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* @param pixels N?mero de pixels
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* @param ppp Puntos por pulgada
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* @return N?mero de milimetros
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*/
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public static double convertPixelsToMms(int pixels, int ppp){ |
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return convertPixelsToInches(pixels, ppp) * MMSINCH;
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} |
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/**
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* Convierte pixels en centimetros dependiendo del los metros por pixel
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* @param pixels N?mero de pixels
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* @param mtsPixel Metros por pixel
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* @return N?mero de centimetros
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*/
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public static double convertPixelsToCms(int pixels, int ppp){ |
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return convertPixelsToInches(pixels, ppp) * CMSINCH;
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} |
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/**
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* Convierte pixels en metros dependiendo del los metros por pixel
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* @param pixels N?mero de pixels
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* @param mtsPixel Metros por pixel
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* @return N?mero de metros
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*/
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public static double convertPixelsToMts(int pixels, int ppp){ |
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return convertPixelsToInches(pixels, ppp) * MTRSINCH;
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} |
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/**
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* Convierte pixels en pulgadas dependiendo del los metros por pixel
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* @param pixels N?mero de pixels
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* @param mtsPixel Metros por pixel
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* @return N?mero de pulgadas
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*/
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public static double convertPixelsToInches(int pixels, int ppp){ |
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return (double)((double)pixels / (double)ppp); |
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} |
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/**
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* Convierte metros en pixels dependiendo de los puntos por pulgada
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* @param mts N?mero de metros
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* @param ppp Puntos por pulgada
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* @return N?mero de pixeles
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*/
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public static int convertMtsToPixels(double mts, int ppp){ |
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return (int)(mts * MathUtils.INCHESMTR * ppp); |
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} |
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/**
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* Convierte pulgadas en pixels dependiendo de los puntos por pulgada
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* @param mts N?mero de pulgadas
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* @param ppp Puntos por pulgada
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* @return N?mero de pixeles
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*/
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public static int convertInchesToPixels(double inches, int ppp){ |
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return (int)(inches * ppp); |
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} |
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/**
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* Convierte centimetros en pixels dependiendo de los puntos por pulgada
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* @param mts N?mero de centmetros
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* @param ppp Puntos por pulgada
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* @return N?mero de pixeles
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*/
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public static int convertCmsToPixels(double cms, int ppp){ |
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return (int)(cms * MathUtils.INCHESCM * ppp); |
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} |
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/**
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* Convierte milimetros en pixels dependiendo de los puntos por pulgada
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* @param mts N?mero de milimetros
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* @param ppp Puntos por pulgada
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* @return N?mero de pixeles
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*/
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public static int convertMmsToPixels(double mms, int ppp){ |
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return (int)(mms * MathUtils.INCHESMM * ppp); |
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} |
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/**
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* Devuelve la traspuesta de una matriz
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* @param M Matriz
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* @param m N?mero de filas
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* @param n N?mero de columnas
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* @return Matriz traspuesta
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*/
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public static double[][] transpose(double[][] M, int m, int n){ |
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double[][] a = new double[n][m]; |
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int i, j;
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for (i = 0; i < n; i++) |
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for (j = 0; j < m; j++) |
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a[i][j] = M[j][i]; |
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return a;
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} |
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/**
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* Producto de matrices (AxB)
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* @param a Matriz A
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* @param b Matriz B
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* @param M
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* @param N
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* @param O
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* @return
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*/
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public static double[][] multmatrix(double[][] a, double[][] b, int M, int N, int O){ |
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double[][] c = new double[M][O]; |
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double sum;
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int i, j, k;
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for (i = 0; i < M; i++) { |
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for (j = 0; j < O; j++) { |
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sum = 0;
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for (k = 0; k < N; k++) |
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sum += b[k][j] * a[i][k]; |
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c[i][j] = sum; |
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} |
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} |
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return (c);
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} |
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/**
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* Calcula el zoom dependiendo del factor de escala pasado por
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* par?metro.
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*/
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public static ViewPort calcZoom(ViewPort vp, double factor){ |
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ViewPort viewPortBlock = new ViewPort(vp.getProjection());
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viewPortBlock.setExtent(vp.getExtent()); |
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viewPortBlock.setImageSize(vp.getImageSize()); |
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viewPortBlock.setScale(); |
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Rectangle2D.Double r = new Rectangle2D.Double(); |
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double nuevoX = (vp.getExtent().getCenterX()) - ((vp.getExtent().getWidth() * factor) / 2.0); |
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double nuevoY = (vp.getExtent().getCenterY()) - ((vp.getExtent().getHeight() * factor) / 2.0); |
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r.x = nuevoX; |
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r.y = nuevoY; |
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r.width = viewPortBlock.getExtent().getWidth() * factor; |
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r.height = viewPortBlock.getExtent().getHeight() * factor; |
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viewPortBlock.setExtent(r); |
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viewPortBlock.setScale(); |
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return viewPortBlock;
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} |
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} |