/*
 Copyright © 2017 Hasan Yavuz Özderya

 This file is part of serialplot.

 serialplot 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 3 of the License, or
 (at your option) any later version.

 serialplot 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 serialplot. If not, see <http://www.gnu.org/licenses/>.
*/

#include <math.h>
#include "framebufferseries.h"

FrameBufferSeries::FrameBufferSeries(FrameBuffer* buffer)
{
 xAsIndex = true;
 _xmin = 0;
 _xmax = 1;
 _buffer = buffer;
 int_index_start = 0;
 int_index_end = _buffer->size();
}

void FrameBufferSeries::setXAxis(bool asIndex, double xmin, double xmax)
{
 xAsIndex = asIndex;
 _xmin = xmin;
 _xmax = xmax;
}

size_t FrameBufferSeries::size() const
{
 return int_index_end - int_index_start;
}

QPointF FrameBufferSeries::sample(size_t i) const
{
 i += int_index_start;
 if (xAsIndex)
 {
 return QPointF(i, _buffer->sample(i));
 }
 else
 {
 return QPointF(i * (_xmax - _xmin) / _buffer->size() + _xmin, _buffer->sample(i));
 }
}

QRectF FrameBufferSeries::boundingRect() const
{
 if (xAsIndex)
 {
 return _buffer->boundingRect();
 }
 else
 {
 auto rect = _buffer->boundingRect();
 rect.setLeft(_xmin);
 rect.setRight(_xmax);
 return rect;
 }
}

void FrameBufferSeries::setRectOfInterest(const QRectF& rect)
{
 if (xAsIndex)
 {
 int_index_start = floor(rect.left())-1;
 int_index_end = ceil(rect.right())+1;
 }
 else
 {
 double xsize = _xmax - _xmin;
 size_t bsize = _buffer->size();
 int_index_start = floor(bsize * (rect.left()-_xmin) / xsize)-1;
 int_index_end = ceil(bsize * (rect.right()-_xmin) / xsize)+1;
 }

 int_index_start = std::max(int_index_start, 0);
 int_index_end = std::min((int) _buffer->size(), int_index_end);
}