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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#pragma once
#include "BLI_utildefines.h"
namespace blender::sim {
/**
* The start time is exclusive and the end time is inclusive. If the duration is zero, the interval
* describes a single point in time.
*/
class TimeInterval {
private:
float start_;
float duration_;
public:
TimeInterval(float start, float duration) : start_(start), duration_(duration)
{
BLI_assert(duration_ >= 0.0f);
}
float start() const
{
return start_;
}
float stop() const
{
return start_ + duration_;
}
float duration() const
{
return duration_;
}
float time_at_factor(float factor) const
{
return start_ + factor * duration_;
}
float factor_at_time(float time) const
{
BLI_assert(duration_ > 0.0f);
return (time - start_) / duration_;
}
float safe_factor_at_time(float time) const
{
if (duration_ > 0.0f) {
return this->factor_at_time(time);
}
return 0.0f;
}
void compute_uniform_samples(MutableSpan<float> r_samples) const
{
int64_t amount = r_samples.size();
if (amount == 0) {
return;
}
if (amount == 1) {
r_samples[0] = this->time_at_factor(0.5f);
return;
}
const float step = duration_ / (float)(amount - 1);
for (int64_t i : r_samples.index_range()) {
r_samples[i] = start_ + i * step;
}
}
};
} // namespace blender::sim
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