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juce_NormalisableRange.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25
26//==============================================================================
38 template <typename ValueType>
39 class NormalisableRange
40{
41 public:
43 NormalisableRange() = default;
44
45 NormalisableRange (const NormalisableRange&) = default;
46 NormalisableRange& operator= (const NormalisableRange&) = default;
47 NormalisableRange (NormalisableRange&&) = default;
48 NormalisableRange& operator= (NormalisableRange&&) = default;
49
51 NormalisableRange (ValueType rangeStart,
52 ValueType rangeEnd,
53 ValueType intervalValue,
54 ValueType skewFactor,
55 bool useSymmetricSkew = false) noexcept
56 : start (rangeStart), end (rangeEnd), interval (intervalValue),
57 skew (skewFactor), symmetricSkew (useSymmetricSkew)
58 {
59 checkInvariants();
60 }
61
63 NormalisableRange (ValueType rangeStart,
64 ValueType rangeEnd) noexcept
65 : start (rangeStart), end (rangeEnd)
66 {
67 checkInvariants();
68 }
69
71 NormalisableRange (ValueType rangeStart,
72 ValueType rangeEnd,
73 ValueType intervalValue) noexcept
74 : start (rangeStart), end (rangeEnd), interval (intervalValue)
75 {
76 checkInvariants();
77 }
78
80 NormalisableRange (Range<ValueType> range) noexcept
81 : NormalisableRange (range.getStart(), range.getEnd())
82 {
83 }
84
86 NormalisableRange (Range<ValueType> range, ValueType intervalValue) noexcept
87 : NormalisableRange (range.getStart(), range.getEnd(), intervalValue)
88 {
89 }
90
92 using ValueRemapFunction = std::function<ValueType(ValueType rangeStart,
93 ValueType rangeEnd,
94 ValueType valueToRemap)>;
95
107 NormalisableRange (ValueType rangeStart,
108 ValueType rangeEnd,
109 ValueRemapFunction convertFrom0To1Func,
110 ValueRemapFunction convertTo0To1Func,
111 ValueRemapFunction snapToLegalValueFunc = {}) noexcept
112 : start (rangeStart),
113 end (rangeEnd),
114 convertFrom0To1Function (std::move (convertFrom0To1Func)),
115 convertTo0To1Function (std::move (convertTo0To1Func)),
116 snapToLegalValueFunction (std::move (snapToLegalValueFunc))
117 {
118 checkInvariants();
119 }
120
124 ValueType convertTo0to1 (ValueType v) const noexcept
125 {
126 if (convertTo0To1Function != nullptr)
127 return clampTo0To1 (convertTo0To1Function (start, end, v));
128
129 auto proportion = clampTo0To1 ((v - start) / (end - start));
130
131 if (skew == static_cast<ValueType> (1))
132 return proportion;
133
134 if (! symmetricSkew)
135 return std::pow (proportion, skew);
136
137 auto distanceFromMiddle = static_cast<ValueType> (2) * proportion - static_cast<ValueType> (1);
138
139 return (static_cast<ValueType> (1) + std::pow (std::abs (distanceFromMiddle), skew)
140 * (distanceFromMiddle < ValueType() ? static_cast<ValueType> (-1)
141 : static_cast<ValueType> (1)))
142 / static_cast<ValueType> (2);
143 }
144
148 ValueType convertFrom0to1 (ValueType proportion) const noexcept
149 {
150 proportion = clampTo0To1 (proportion);
151
152 if (convertFrom0To1Function != nullptr)
153 return convertFrom0To1Function (start, end, proportion);
154
155 if (! symmetricSkew)
156 {
157 if (skew != static_cast<ValueType> (1) && proportion > ValueType())
158 proportion = std::exp (std::log (proportion) / skew);
159
160 return start + (end - start) * proportion;
161 }
162
163 auto distanceFromMiddle = static_cast<ValueType> (2) * proportion - static_cast<ValueType> (1);
164
165 if (skew != static_cast<ValueType> (1) && distanceFromMiddle != static_cast<ValueType> (0))
166 distanceFromMiddle = std::exp (std::log (std::abs (distanceFromMiddle)) / skew)
167 * (distanceFromMiddle < ValueType() ? static_cast<ValueType> (-1)
168 : static_cast<ValueType> (1));
169
170 return start + (end - start) / static_cast<ValueType> (2) * (static_cast<ValueType> (1) + distanceFromMiddle);
171 }
172
176 ValueType snapToLegalValue (ValueType v) const noexcept
177 {
178 if (snapToLegalValueFunction != nullptr)
179 return snapToLegalValueFunction (start, end, v);
180
181 if (interval > ValueType())
182 v = start + interval * std::floor ((v - start) / interval + static_cast<ValueType> (0.5));
183
184 return (v <= start || end <= start) ? start : (v >= end ? end : v);
185 }
186
188 Range<ValueType> getRange() const noexcept { return { start, end }; }
189
198 void setSkewForCentre (ValueType centrePointValue) noexcept
199 {
200 jassert (centrePointValue > start);
201 jassert (centrePointValue < end);
202
203 symmetricSkew = false;
204 skew = std::log (static_cast<ValueType> (0.5)) / std::log ((centrePointValue - start) / (end - start));
205 checkInvariants();
206 }
207
209 ValueType start = 0;
210
212 ValueType end = 1;
213
220 ValueType interval = 0;
221
234 ValueType skew = 1;
235
237 bool symmetricSkew = false;
238
239 private:
240 void checkInvariants() const
241 {
242 jassert (end > start);
243 jassert (interval >= ValueType());
244 jassert (skew > ValueType());
245 }
246
247 static ValueType clampTo0To1 (ValueType value)
248 {
249 auto clampedValue = jlimit (static_cast<ValueType> (0), static_cast<ValueType> (1), value);
250
251 // If you hit this assertion then either your normalisation function is not working
252 // correctly or your input is out of the expected bounds.
253 jassert (clampedValue == value);
254
255 return clampedValue;
256 }
257
258 ValueRemapFunction convertFrom0To1Function, convertTo0To1Function, snapToLegalValueFunction;
259};
260
261} // namespace juce
juce::NormalisableRange
Definition: juce_NormalisableRange.h:40
juce::NormalisableRange::skew
ValueType skew
Definition: juce_NormalisableRange.h:234
juce::NormalisableRange::end
ValueType end
Definition: juce_NormalisableRange.h:212
juce::NormalisableRange::symmetricSkew
bool symmetricSkew
Definition: juce_NormalisableRange.h:237
juce::NormalisableRange::snapToLegalValue
ValueType snapToLegalValue(ValueType v) const noexcept
Definition: juce_NormalisableRange.h:176
juce::NormalisableRange::ValueRemapFunction
std::function< ValueType(ValueType rangeStart, ValueType rangeEnd, ValueType valueToRemap)> ValueRemapFunction
Definition: juce_NormalisableRange.h:94
juce::NormalisableRange::NormalisableRange
NormalisableRange()=default
juce::NormalisableRange::start
ValueType start
Definition: juce_NormalisableRange.h:209
juce::NormalisableRange::convertFrom0to1
ValueType convertFrom0to1(ValueType proportion) const noexcept
Definition: juce_NormalisableRange.h:148
juce::NormalisableRange::NormalisableRange
NormalisableRange(ValueType rangeStart, ValueType rangeEnd) noexcept
Definition: juce_NormalisableRange.h:63
juce::NormalisableRange::setSkewForCentre
void setSkewForCentre(ValueType centrePointValue) noexcept
Definition: juce_NormalisableRange.h:198
juce::NormalisableRange::NormalisableRange
NormalisableRange(ValueType rangeStart, ValueType rangeEnd, ValueRemapFunction convertFrom0To1Func, ValueRemapFunction convertTo0To1Func, ValueRemapFunction snapToLegalValueFunc={}) noexcept
Definition: juce_NormalisableRange.h:107
juce::NormalisableRange::NormalisableRange
NormalisableRange(ValueType rangeStart, ValueType rangeEnd, ValueType intervalValue) noexcept
Definition: juce_NormalisableRange.h:71
juce::NormalisableRange::getRange
Range< ValueType > getRange() const noexcept
Definition: juce_NormalisableRange.h:188
juce::NormalisableRange::interval
ValueType interval
Definition: juce_NormalisableRange.h:220
juce::NormalisableRange::NormalisableRange
NormalisableRange(Range< ValueType > range, ValueType intervalValue) noexcept
Definition: juce_NormalisableRange.h:86
juce::NormalisableRange::NormalisableRange
NormalisableRange(ValueType rangeStart, ValueType rangeEnd, ValueType intervalValue, ValueType skewFactor, bool useSymmetricSkew=false) noexcept
Definition: juce_NormalisableRange.h:51
juce::NormalisableRange::convertTo0to1
ValueType convertTo0to1(ValueType v) const noexcept
Definition: juce_NormalisableRange.h:124
juce::NormalisableRange::NormalisableRange
NormalisableRange(Range< ValueType > range) noexcept
Definition: juce_NormalisableRange.h:80
juce::Range
Definition: juce_Range.h:40