summaryrefslogtreecommitdiffhomepage
path: root/spline-widget/functionconfig.cpp
blob: 27f3bf4007f7743a61e0c9b6eb44f4adba571545 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/* Copyright (c) 2012-2015, Stanislaw Halik <sthalik@misaki.pl>

 * Permission to use, copy, modify, and/or distribute this
 * software for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice and this permission
 * notice appear in all copies.
 */

#include <QMutexLocker>
#include <QCoreApplication>
#include <QPointF>
#include <QList>
#include "functionconfig.h"
#include <QtAlgorithms>
#include <QtAlgorithms>
#include <QSettings>
#include <QPixmap>
#include <algorithm>
#include <cmath>

void Map::setTrackingActive(bool blnActive)
{
    activep = blnActive;
}

Map::Map() :
    _mutex(QMutex::Recursive),
    activep(false),
    max_x(0),
    max_y(0)
{
}

float Map::getValue(float x) {
    QMutexLocker foo(&_mutex);
    float q  = x * precision();
    int    xi = (int)q;
    float  yi = getValueInternal(xi);
    float  yiplus1 = getValueInternal(xi+1);
    float  f = (q-xi);
    float  ret = yiplus1 * f + yi * (1.0f - f); // at least do a linear interpolation.
    last_input_value.setX(std::fabs(x));
    last_input_value.setY(std::fabs(ret));
    return ret;
}

bool Map::getLastPoint(QPointF& point ) {
    QMutexLocker foo(&_mutex);
    point = last_input_value;
    return activep;
}

float Map::getValueInternal(int x) {
    float sign = x < 0 ? -1 : 1;
    x = abs(x);
    float ret;
    int sz = cur.data.size();
    if (sz == 0)
        ret = 0;
    else
        ret = cur.data[std::min<unsigned>(x, sz-1)];
    return ret * sign;
}

static QPointF ensureInBounds(QList<QPointF> points, int i) {
    int siz = points.size();
    if (siz == 0 || i < 0)
        return QPointF(0, 0);
    if (siz > i)
        return points[i];
    return points[siz - 1];
}

static bool sortFn(const QPointF& one, const QPointF& two) {
    return one.x() < two.x();
}

void Map::reload() {
    if (cur.input.size())
    {
        qStableSort(cur.input.begin(), cur.input.end(), sortFn);

        QList<QPointF> input = cur.input;
        auto& data = cur.data;

        data = std::vector<float>(value_count);
        const int mult = precision();
        const int mult_ = mult * 30;
        
        const int sz = data.size();
        
        for (int i = 0; i < sz; i++)
            data[i] = -1;
        
        if (input.size() == 1 && input[0].x() > 1e-2)
        {
            for (int k = 0; k < input[0].x() * mult; k++) {
                if (k < sz)
                    data[k] = input[0].y() * k / (input[0].x() * mult);
            }
        }
        else if (input[0].x() > 1e-2)
            input.prepend(QPointF(0, 0));
        
        for (int i = 0; i < sz; i++) {
            const QPointF p0 = ensureInBounds(input, i - 1);
            const QPointF p1 = ensureInBounds(input, i);
            const QPointF p2 = ensureInBounds(input, i + 1);
            const QPointF p3 = ensureInBounds(input, i + 2);

            const float p0_x = p0.x(), p1_x = p1.x(), p2_x = p2.x(), p3_x = p3.x();
            const float p0_y = p0.y(), p1_y = p1.y(), p2_y = p2.y(), p3_y = p3.y();
            
            // multiplier helps fill in all the x's needed
            const int end = std::min<int>(sz, p2.x() * mult_);
            const int start = p1.x() * mult;
            
            for (int j = start; j < end; j++) {
                const float t = (j - start) / (float) (end - start);
                const float t2 = t*t;
                const float t3 = t*t*t;

                const int x = .5 * ((2. * p1_x) +
                                    (-p0_x + p2_x) * t +
                                    (2. * p0_x - 5. * p1_x + 4. * p2_x - p3_x) * t2 +
                                    (-p0_x + 3. * p1_x - 3. * p2_x + p3_x) * t3)
                        * mult;
                
                const float y = .5 * ((2. * p1_y) +
                                      (-p0_y + p2_y) * t +
                                      (2. * p0_y - 5. * p1_y + 4. * p2_y - p3_y) * t2 +
                                      (-p0_y + 3. * p1_y - 3. * p2_y + p3_y) * t3);
                
                if (x >= 0 && x < sz)
                    data[x] = y;
            }
        }
        
        float last = 0;
        for (int i = 0; i < sz; i++)
        {
            if (data[i] < 0)
                data[i] = last;
            last = data[i];
        }
    }
    else
        cur.data.clear();
}

void Map::removePoint(int i) {
    QMutexLocker foo(&_mutex);
    if (i >= 0 && i < cur.input.size())
    {
        cur.input.removeAt(i);
        reload();
    }
}

void Map::addPoint(QPointF pt) {
    QMutexLocker foo(&_mutex);
    cur.input.append(pt);
    reload();
    qStableSort(cur.input.begin(), cur.input.end(), sortFn);
}

void Map::movePoint(int idx, QPointF pt) {
    QMutexLocker foo(&_mutex);
    if (idx >= 0 && idx < cur.input.size())
    {
        cur.input[idx] = pt;
        reload();
        // we don't allow points to be reordered, so no sort here
    }
}

const QList<QPointF> Map::getPoints() {
    QMutexLocker foo(&_mutex);
    return cur.input;
}

void Map::invalidate_unsaved_settings()
{
    QMutexLocker foo(&_mutex);
    cur = saved;
    reload();
}

void Map::loadSettings(QSettings& settings, const QString& title) {
    QMutexLocker foo(&_mutex);
    QPointF newPoint;
    QList<QPointF> points;
    settings.beginGroup(QString("Curves-%1").arg(title));

    int max = settings.value("point-count", 0).toInt();

    for (int i = 0; i < max; i++) {
        newPoint = QPointF(settings.value(QString("point-%1-x").arg(i), 0).toDouble(),
                           settings.value(QString("point-%1-y").arg(i), 0).toDouble());
        if (newPoint.x() > max_x) {
            newPoint.setX(max_x);
        }
        if (newPoint.y() > max_y) {
            newPoint.setY(max_y);
        }
        points.append(newPoint);
    }

    settings.endGroup();
    
    if (max == 0)
        points.append(QPointF(maxInput(), maxOutput()));
    
    cur.input = points;
    reload();
    saved = cur;
}

void Map::saveSettings(QSettings& settings, const QString& title) {
    QMutexLocker foo(&_mutex);
    settings.beginGroup(QString("Curves-%1").arg(title));
    int max = cur.input.size();
    settings.setValue("point-count", max);

    for (int i = 0; i < max; i++) {
        settings.setValue(QString("point-%1-x").arg(i), cur.input[i].x());
        settings.setValue(QString("point-%1-y").arg(i), cur.input[i].y());
    }

    for (int i = max; true; i++)
    {
        QString x = QString("point-%1-x").arg(i);
        if (!settings.contains(x))
            break;
        settings.remove(x);
        settings.remove(QString("point-%1-y").arg(i));
    }
    
    saved = cur;
        
    settings.endGroup();
}


int Map::precision() const {
    if (cur.input.size())
        return value_count / std::max<float>(1.f, (cur.input[cur.input.size() - 1].x()));
    return 1;
}