1 /*
2 * Copyright (c) 2003-2008 by Cosylab d. d.
3 *
4 * This file is part of CosyBeans-Common.
5 *
6 * CosyBeans-Common is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * CosyBeans-Common is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with CosyBeans-Common. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 package com.cosylab.gui.components.range2;
21
22 /**
23 * Implementation of linear range.
24 *
25 * @author <a href="mailto:ales.pucelj@cosylab.com">Ales Pucelj</a>
26 * @version $id$
27 */
28 public class LinearRange implements Range
29 {
30
31 private TickCalculator defaultTickCalculator;
32
33 /**
34 * Returns the parameters.
35 *
36 * @see com.cosylab.gui.components.range.Range#checkValue(double)
37 */
38 public double validate(double value)
39 {
40 return value;
41 }
42
43 /**
44 * Converts relative value in this range to absolute. If span of range is
45 * infinite, return value is 0. Conversion is implemented for all values
46 * even outside the 0.0 - 1.0 range.
47 *
48 * @param relative value in range 0.0 to 1.0 inclusively.
49 *
50 * @return absolute value.
51 *
52 * @see com.cosylab.gui.components.range.Range#toAbsolute(double)
53 */
54 public double toAbsolute(double relative, RangedValue ranged)
55 {
56 final double min = ranged.getMinimum();
57 final double max = ranged.getMaximum();
58
59 if (Double.isInfinite(max) || (Double.isInfinite(min))) {
60 return 0.0;
61 }
62
63 return min + relative * (max - min);
64 }
65
66 /**
67 * Converts absolute value into relative (defined in 0.0 to 1.0 range). If
68 * span of the range is infinite, return value is 0.5. Conversion is
69 * defined for all values of even outside the range.
70 *
71 * @param absolute value.
72 *
73 * @return relative value.
74 *
75 * @see com.cosylab.gui.components.range.Range#toRelative(double)
76 */
77 public double toRelative(double absolute, RangedValue ranged)
78 {
79 double range = ranged.getMaximum() - ranged.getMinimum();
80
81 if (range == 0.0) {
82 return 0.5;
83 }
84
85 if (Double.isInfinite(range)) {
86 return 0.5;
87 }
88
89 return (absolute - ranged.getMinimum()) / range;
90 }
91
92 /*
93 * (non-Javadoc)
94 * @see com.cosylab.gui.components.range2.Range#getDefaultTickCalculator()
95 */
96 public TickCalculator getDefaultTickCalculator() {
97 if (defaultTickCalculator == null) {
98 defaultTickCalculator = new LinearTickCalculator(3, false);
99 }
100 return defaultTickCalculator;
101 }
102 }
103
104 /* __oOo__ */