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/* Copyright (c) 2015-2016, 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 "slider.hpp"
#include <cmath>
namespace options {
slider_value::slider_value(double cur, double min, double max) :
cur_(cur),
min_(min),
max_(max)
{
if (min_ > max_)
min_ = max_;
if (cur_ > max_)
cur_ = max;
if (cur_ < min_)
cur_ = min_;
}
slider_value::slider_value(const slider_value& v) : slider_value(v.cur(), v.min(), v.max())
{
}
slider_value::slider_value() : slider_value(0, 0, 0)
{
}
slider_value& slider_value::operator=(const slider_value& v)
{
cur_ = v.cur_;
min_ = v.min_;
max_ = v.max_;
return *this;
}
bool slider_value::operator==(const slider_value& v) const
{
using std::fabs;
constexpr double eps = 2e-3;
#if 1
return (fabs(v.cur_ - cur_) < eps &&
fabs(v.min_ - min_) < eps &&
fabs(v.max_ - max_) < eps);
#else
return (fabs(v.cur_ - cur_) < eps);
#endif
}
slider_value slider_value::update_from_slider(int pos, int q_min, int q_max) const
{
slider_value v(*this);
const int q_diff = q_max - q_min;
const double sv_pos = q_diff == 0
? 0
: (((pos - q_min) * (v.max() - v.min())) / q_diff + v.min());
if (sv_pos < v.min())
v = slider_value(v.min(), v.min(), v.max());
else if (sv_pos > v.max())
v = slider_value(v.max(), v.min(), v.max());
else
v = slider_value(sv_pos, v.min(), v.max());
return v;
}
int slider_value::to_slider_pos(int q_min, int q_max) const
{
const int q_diff = q_max - q_min;
const double div = max() - min();
if (std::fabs(div) < 1e-4)
return q_min;
else
return int(std::round(((cur() - min()) * q_diff / div) + q_min));
}
} // end ns options
using slider_value = options::slider_value;
QDataStream& operator << (QDataStream& out, const options::slider_value& v)
{
out << v.cur()
<< v.min()
<< v.max();
return out;
}
QDebug operator << (QDebug dbg, const options::slider_value& val)
{
return dbg << val.cur();
}
QDataStream& operator >> (QDataStream& in, options::slider_value& v)
{
double cur = 0, min = 0, max = 0;
in >> cur >> min >> max;
v = slider_value(cur, min, max);
return in;
}
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