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/* Copyright (c) 2012-2016, 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 "spline.hpp"
#include <QMutexLocker>
#include <QCoreApplication>
#include <QPointF>
#include <QList>
#include <QtAlgorithms>
#include <QtAlgorithms>
#include <QSettings>
#include <QPixmap>
#include <QString>
#include <algorithm>
#include <cmath>
#include <QDebug>
void spline::setTrackingActive(bool blnActive)
{
activep = blnActive;
}
spline::spline() : spline(0, 0)
{
}
void spline::removeAllPoints()
{
QMutexLocker foo(&_mutex);
cur.input.clear();
reload();
}
void spline::setMaxInput(qreal max_input)
{
QMutexLocker l(&_mutex);
max_x = max_input;
}
void spline::setMaxOutput(qreal max_output)
{
QMutexLocker l(&_mutex);
max_y = max_output;
}
qreal spline::maxInput() const
{
QMutexLocker l(&_mutex);
return max_x;
}
qreal spline::maxOutput() const
{
QMutexLocker l(&_mutex);
return max_y;
}
spline::spline(qreal maxx, qreal maxy) :
_mutex(QMutex::Recursive),
max_x(0),
max_y(0),
activep(false)
{
setMaxInput(maxx);
setMaxOutput(maxy);
if (cur.input.size() == 0)
cur.input.push_back(QPointF(maxx, maxy));
reload();
}
float spline::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 spline::getLastPoint(QPointF& point )
{
QMutexLocker foo(&_mutex);
point = last_input_value;
return activep;
}
float spline::getValueInternal(int x)
{
float sign = x < 0 ? -1 : 1;
x = abs(x);
float ret;
unsigned sz = cur.data.size();
if (sz == 0)
ret = 0;
else
ret = cur.data[std::min(unsigned(x), sz-1u)];
return ret * sign;
}
static QPointF ensureInBounds(const 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 spline::reload()
{
if (cur.input.size())
{
std::stable_sort(cur.input.begin(), cur.input.end(), sortFn);
QList<QPointF> input = cur.input;
auto& data = cur.data;
data = std::vector<float>(value_count);
const float mult = precision();
const unsigned mult_ = unsigned(mult * 30);
const unsigned sz = data.size();
for (unsigned i = 0; i < sz; i++)
data[i] = -1;
if (input.size() == 1 && input[0].x() > 1e-2)
{
const float x = float(input[0].x());
const float y = float(input[0].y());
const unsigned max = unsigned(x * mult);
for (unsigned k = 0; k < max; k++) {
if (k < sz)
data[k] = y * k / max;
}
}
else if (input[0].x() > 1e-2)
input.prepend(QPointF(0, 0));
for (int i = 0; i < int(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 unsigned end = std::min(sz, unsigned(p2_x * mult_));
const unsigned start = unsigned(p1_x * mult);
for (unsigned 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 = .5f * ((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 = .5f * ((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 < (int)sz)
data[x] = y;
}
}
float last = 0;
for (unsigned i = 0; i < sz; i++)
{
if (data[i] < 0)
data[i] = last;
last = data[i];
}
}
else
cur.data.clear();
}
void spline::removePoint(int i)
{
QMutexLocker foo(&_mutex);
if (i >= 0 && i < cur.input.size())
{
cur.input.removeAt(i);
reload();
}
}
void spline::addPoint(QPointF pt)
{
QMutexLocker foo(&_mutex);
cur.input.append(pt);
reload();
std::stable_sort(cur.input.begin(), cur.input.end(), sortFn);
}
void spline::movePoint(int idx, QPointF pt)
{
QMutexLocker foo(&_mutex);
if (idx >= 0 && idx < cur.input.size())
{
cur.input[idx] = pt;
// we don't allow points to be reordered, but sort due to possible caller logic error
std::stable_sort(cur.input.begin(), cur.input.end(), sortFn);
reload();
}
}
const QList<QPointF> spline::getPoints()
{
QMutexLocker foo(&_mutex);
return cur.input;
}
void spline::invalidate_unsaved_settings()
{
QMutexLocker foo(&_mutex);
cur = saved;
reload();
}
void spline::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;
}
bool spline::State::operator==(const State& other) const
{
if (input.size() != other.input.size())
return false;
const int sz = input.size();
using std::fabs;
for (int i = 0; i < sz; i++)
{
const qreal eps = 1e-3;
if (fabs(input[i].x() - other.input[i].x()) > eps ||
fabs(input[i].y() - other.input[i].y()) > eps)
{
return false;
}
}
return true;
}
void spline::saveSettings(QSettings& settings, const QString& title)
{
QMutexLocker foo(&_mutex);
if (cur == saved)
return;
qDebug() << "spline-widget: saving" << title;
settings.beginGroup(QStringLiteral("Curves-%1").arg(title));
if (cur.input.size() == 0)
cur.input.push_back(QPointF(max_x, max_y));
const 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 spline::precision() const
{
if (cur.input.size())
return (value_count-1) / std::max<float>(1.f, (cur.input[cur.input.size() - 1].x()));
return 1;
}
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