01: /*
02: * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
03: * for visualizing and manipulating spatial features with geometry and attributes.
04: *
05: * Copyright (C) 2003 Vivid Solutions
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * as published by the Free Software Foundation; either version 2
10: * of the License, or (at your option) any later version.
11: *
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with this program; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20: *
21: * For more information, contact:
22: *
23: * Vivid Solutions
24: * Suite #1A
25: * 2328 Government Street
26: * Victoria BC V8T 5G5
27: * Canada
28: *
29: * (250)385-6040
30: * www.vividsolutions.com
31: */
32:
33: package com.vividsolutions.jump.util;
34:
35: /**
36: * Additional math utilities.
37: * @see Math
38: */
39: public class MathUtil {
40: public MathUtil() {
41: }
42:
43: public static double orderOfMagnitude(double x) {
44: return base10Log(x);
45: }
46:
47: public static double base10Log(double x) {
48: return Math.log(x) / Math.log(10);
49: }
50:
51: public static int mostSignificantDigit(double x) {
52: return (int) (x / Math.pow(10, Math.floor(MathUtil
53: .orderOfMagnitude(x))));
54: }
55:
56: /**
57: * Returns the average of two doubles
58: * @param a one of the doubles to average
59: * @param b the other double to average
60: * @return the average of two doubles
61: */
62: public static double avg(double a, double b) {
63: return (a + b) / 2d;
64: }
65: }
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