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distanceUnit.cxx
Go to the documentation of this file.
1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file distanceUnit.cxx
10 * @author drose
11 * @date 2001-04-17
12 */
13
14#include "distanceUnit.h"
15#include "config_pandatoolbase.h"
16#include "string_utils.h"
17#include "pnotify.h"
18
19 using std::istream;
20 using std::ostream;
21 using std::string;
22
23/**
24 * Returns the string representing the common abbreviation for the given unit.
25 */
26 string
27 format_abbrev_unit(DistanceUnit unit) {
28 switch (unit) {
29 case DU_millimeters:
30 return "mm";
31
32 case DU_centimeters:
33 return "cm";
34
35 case DU_meters:
36 return "m";
37
38 case DU_kilometers:
39 return "km";
40
41 case DU_yards:
42 return "yd";
43
44 case DU_feet:
45 return "ft";
46
47 case DU_inches:
48 return "in";
49
50 case DU_nautical_miles:
51 return "nmi";
52
53 case DU_statute_miles:
54 return "mi";
55
56 case DU_invalid:
57 return "invalid";
58 }
59 nout << "**unexpected DistanceUnit value: (" << (int)unit << ")**";
60 return "**";
61}
62
63/**
64 * Returns the string representing the full name (plural) for the given unit.
65 */
66 string
67 format_long_unit(DistanceUnit unit) {
68 switch (unit) {
69 case DU_millimeters:
70 return "millimeters";
71
72 case DU_centimeters:
73 return "centimeters";
74
75 case DU_meters:
76 return "meters";
77
78 case DU_kilometers:
79 return "kilometers";
80
81 case DU_yards:
82 return "yards";
83
84 case DU_feet:
85 return "feet";
86
87 case DU_inches:
88 return "inches";
89
90 case DU_nautical_miles:
91 return "nautical miles";
92
93 case DU_statute_miles:
94 return "miles";
95
96 case DU_invalid:
97 return "invalid";
98 }
99 nout << "**unexpected DistanceUnit value: (" << (int)unit << ")**";
100 return "**";
101}
102
103/**
104 *
105 */
106ostream &
107operator << (ostream &out, DistanceUnit unit) {
108 return out << format_abbrev_unit(unit);
109}
110
111/**
112 *
113 */
114istream &
115operator >> (istream &in, DistanceUnit &unit) {
116 string word;
117 in >> word;
118 unit = string_distance_unit(word);
119 if (unit == DU_invalid) {
120 pandatoolbase_cat->error()
121 << "Invalid distance unit: " << word << "\n";
122 }
123 return in;
124}
125
126/**
127 * Converts from a string, as might be input by the user, to one of the known
128 * DistanceUnit types. Returns DU_invalid if the string is unknown.
129 */
130 DistanceUnit
131 string_distance_unit(const string &str) {
132 if (cmp_nocase(str, "mm") == 0 || cmp_nocase(str, "millimeters") == 0) {
133 return DU_millimeters;
134
135 } else if (cmp_nocase(str, "cm") == 0 || cmp_nocase(str, "centimeters") == 0) {
136 return DU_centimeters;
137
138 } else if (cmp_nocase(str, "m") == 0 || cmp_nocase(str, "meters") == 0) {
139 return DU_meters;
140
141 } else if (cmp_nocase(str, "km") == 0 || cmp_nocase(str, "kilometers") == 0) {
142 return DU_kilometers;
143
144 } else if (cmp_nocase(str, "yd") == 0 || cmp_nocase(str, "yards") == 0) {
145 return DU_yards;
146
147 } else if (cmp_nocase(str, "ft") == 0 || cmp_nocase(str, "feet") == 0) {
148 return DU_feet;
149
150 } else if (cmp_nocase(str, "in") == 0 || cmp_nocase(str, "inches") == 0) {
151 return DU_inches;
152
153 } else if (cmp_nocase(str, "nmi") == 0 ||
154 cmp_nocase(str, "nm") == 0 ||
155 cmp_nocase_uh(str, "nautical_miles") == 0) {
156 return DU_nautical_miles;
157
158 } else if (cmp_nocase(str, "mi") == 0 ||
159 cmp_nocase(str, "miles") == 0 ||
160 cmp_nocase_uh(str, "statute_miles") == 0) {
161 return DU_statute_miles;
162
163 } else {
164 return DU_invalid;
165 }
166}
167
168/**
169 * Returns the number of the indicated unit per each centimeter. This
170 * internal function is used to implement convert_units(), below.
171 */
172 static double unit_scale(DistanceUnit unit) {
173 switch (unit) {
174 case DU_millimeters:
175 return 0.1;
176
177 case DU_centimeters:
178 return 1.0;
179
180 case DU_meters:
181 return 100.0;
182
183 case DU_kilometers:
184 return 100000.0;
185
186 case DU_yards:
187 return 3.0 * 12.0 * 2.54;
188
189 case DU_feet:
190 return 12.0 * 2.54;
191
192 case DU_inches:
193 return 2.54;
194
195 case DU_nautical_miles:
196 // This is the U.S. definition.
197 return 185200.0;
198
199 case DU_statute_miles:
200 return 5280.0 * 12.0 * 2.54;
201
202 case DU_invalid:
203 return 1.0;
204 }
205
206 return 1.0;
207}
208
209/**
210 * Returns the scaling factor that must be applied to convert from units of
211 * "from" to "to".
212 */
213 double convert_units(DistanceUnit from, DistanceUnit to) {
214 return unit_scale(from) / unit_scale(to);
215}
config_pandatoolbase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
format_long_unit
string format_long_unit(DistanceUnit unit)
Returns the string representing the full name (plural) for the given unit.
Definition distanceUnit.cxx:67
format_abbrev_unit
string format_abbrev_unit(DistanceUnit unit)
Returns the string representing the common abbreviation for the given unit.
Definition distanceUnit.cxx:27
convert_units
double convert_units(DistanceUnit from, DistanceUnit to)
Returns the scaling factor that must be applied to convert from units of "from" to "to".
Definition distanceUnit.cxx:213
string_distance_unit
DistanceUnit string_distance_unit(const string &str)
Converts from a string, as might be input by the user, to one of the known DistanceUnit types.
Definition distanceUnit.cxx:131
distanceUnit.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
DistanceUnit
DistanceUnit
This enumerated type lists all the kinds of units we're likely to come across in model conversion pro...
Definition distanceUnit.h:23
pnotify.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
string_utils.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.