svn-gvsig-desktop / trunk / libraries / libRaster / src / org / gvsig / raster / util / MathUtils.java @ 12522
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| 1 | 11250 | nacho | /* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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| 2 | *
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| 3 | * Copyright (C) 2007 IVER T.I. and Generalitat Valenciana.
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| 4 | *
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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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| 9 | *
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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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| 14 | *
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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| 18 | */
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| 19 | package org.gvsig.raster.util; |
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| 20 | |||
| 21 | /**
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| 22 | * Utilidades para calculos matem?ticos
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| 23 | *
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| 24 | * @version 18/04/2007
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| 25 | * @author Nacho Brodin (nachobrodin@gmail.com)
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| 26 | *
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| 27 | */
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| 28 | public class MathUtils { |
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| 29 | public static double INCHESMTR = 39.73007874D; |
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| 30 | public static double INCHESCM = 0.3973007874D; |
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| 31 | public static double INCHESMM = 0.03973007874D; |
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| 32 | public static double MTRSINCH = 0.0254D; |
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| 33 | public static double MMSINCH = 25.4D; |
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| 34 | public static double CMSINCH = 2.54D; |
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| 35 | |||
| 36 | |||
| 37 | /**
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| 38 | * Recorta el n?mero de decimales a n del n?mero pasado por par?metro
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| 39 | * @return N?mero recortado
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| 40 | */
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| 41 | public static double tailDecimals(double num, int n){ |
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| 42 | int m = (int)Math.pow(10, n); |
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| 43 | num *= m; |
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| 44 | int aux = ((int)num); |
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| 45 | num = (double)((double)aux / (double)m); |
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| 46 | return num;
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| 47 | } |
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| 48 | |||
| 49 | /**
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| 50 | * Convierte pixels en milimetros dependiendo del los puntos por pulgada
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| 51 | * @param pixels N?mero de pixels
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| 52 | * @param ppp Puntos por pulgada
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| 53 | * @return N?mero de milimetros
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| 54 | */
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| 55 | public static double convertPixelsToMms(int pixels, int ppp){ |
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| 56 | return convertPixelsToInches(pixels, ppp) * MMSINCH;
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| 57 | } |
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| 58 | |||
| 59 | /**
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| 60 | * Convierte pixels en centimetros dependiendo del los metros por pixel
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| 61 | * @param pixels N?mero de pixels
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| 62 | * @param mtsPixel Metros por pixel
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| 63 | * @return N?mero de centimetros
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| 64 | */
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| 65 | public static double convertPixelsToCms(int pixels, int ppp){ |
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| 66 | return convertPixelsToInches(pixels, ppp) * CMSINCH;
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| 67 | } |
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| 68 | |||
| 69 | /**
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| 70 | * Convierte pixels en metros dependiendo del los metros por pixel
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| 71 | * @param pixels N?mero de pixels
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| 72 | * @param mtsPixel Metros por pixel
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| 73 | * @return N?mero de metros
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| 74 | */
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| 75 | public static double convertPixelsToMts(int pixels, int ppp){ |
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| 76 | return convertPixelsToInches(pixels, ppp) * MTRSINCH;
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| 77 | } |
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| 78 | |||
| 79 | /**
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| 80 | * Convierte pixels en pulgadas dependiendo del los metros por pixel
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| 81 | * @param pixels N?mero de pixels
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| 82 | * @param mtsPixel Metros por pixel
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| 83 | * @return N?mero de pulgadas
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| 84 | */
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| 85 | public static double convertPixelsToInches(int pixels, int ppp){ |
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| 86 | return (double)((double)pixels / (double)ppp); |
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| 87 | } |
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| 88 | |||
| 89 | /**
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| 90 | * Convierte metros en pixels dependiendo de los puntos por pulgada
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| 91 | * @param mts N?mero de metros
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| 92 | * @param ppp Puntos por pulgada
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| 93 | * @return N?mero de pixeles
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| 94 | */
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| 95 | public static int convertMtsToPixels(double mts, int ppp){ |
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| 96 | return (int)(mts * MathUtils.INCHESMTR * ppp); |
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| 97 | } |
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| 98 | |||
| 99 | /**
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| 100 | * Convierte pulgadas en pixels dependiendo de los puntos por pulgada
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| 101 | * @param mts N?mero de pulgadas
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| 102 | * @param ppp Puntos por pulgada
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| 103 | * @return N?mero de pixeles
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| 104 | */
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| 105 | public static int convertInchesToPixels(double inches, int ppp){ |
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| 106 | return (int)(inches * ppp); |
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| 107 | } |
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| 108 | |||
| 109 | /**
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| 110 | * Convierte centimetros en pixels dependiendo de los puntos por pulgada
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| 111 | * @param mts N?mero de centmetros
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| 112 | * @param ppp Puntos por pulgada
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| 113 | * @return N?mero de pixeles
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| 114 | */
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| 115 | public static int convertCmsToPixels(double cms, int ppp){ |
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| 116 | return (int)(cms * MathUtils.INCHESCM * ppp); |
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| 117 | } |
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| 118 | |||
| 119 | /**
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| 120 | * Convierte milimetros en pixels dependiendo de los puntos por pulgada
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| 121 | * @param mts N?mero de milimetros
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| 122 | * @param ppp Puntos por pulgada
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| 123 | * @return N?mero de pixeles
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| 124 | */
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| 125 | public static int convertMmsToPixels(double mms, int ppp){ |
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| 126 | return (int)(mms * MathUtils.INCHESMM * ppp); |
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| 127 | } |
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| 128 | } |