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.workbench.ui.plugin.scalebar;
34:
35: import java.text.DecimalFormat;
36:
37: /**
38: * Numbers with one or two significant digits, like 1 x 10^3, or 5 x 10^2.
39: */
40: public class RoundQuantity {
41: private Unit unit;
42: private int mantissa;
43: private int exponent;
44:
45: public RoundQuantity(int mantissa, int exponent, Unit unit) {
46: this .mantissa = mantissa;
47: this .exponent = exponent;
48: this .unit = unit;
49: }
50:
51: public Unit getUnit() {
52: return unit;
53: }
54:
55: public int getMantissa() {
56: return mantissa;
57: }
58:
59: public String toString() {
60: return getAmountString() + " " + getUnit();
61: }
62:
63: public String getAmountString() {
64: if (getMantissa() == 0) {
65: return "0";
66: }
67:
68: if ((0 <= getExponent()) && (getExponent() <= 3)) {
69: return new DecimalFormat("#").format(getAmount());
70: }
71:
72: if ((-4 <= getExponent()) && (getExponent() < 0)) {
73: return new DecimalFormat("#.####").format(getAmount());
74: }
75:
76: return getMantissa() + "E" + getExponent();
77: }
78:
79: public int getExponent() {
80: return exponent;
81: }
82:
83: public double getAmount() {
84: return mantissa * Math.pow(10, exponent);
85: }
86:
87: public double getModelValue() {
88: return getAmount() * unit.getModelValue();
89: }
90: }
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