tempo-plotter Changeset - 821ffb9df66a · protofusion repositories

Changeset - 821ffb9df66a

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Hasan Yavuz ÖZDERYA - 8 years ago 2017-08-13 10:50:36
hy@ozderya.net

implement setRectOfInterest for faster drawing when zoomed in

2 files changed with 28 insertions and 2 deletions:

src/framebufferseries.cpp

src/framebufferseries.h

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src/framebufferseries.cpp

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@@ @@ -4,64 +4,86 @@ @@
   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 "framebufferseries.h"
 FrameBufferSeries::FrameBufferSeries(FrameBuffer* buffer)
+{
     xAsIndex = true;
     _xmin = 0;
     _xmax = 1;
     _buffer = buffer;
     int_index_start = 0;
     int_index_end = 0;
+}
 void FrameBufferSeries::setXAxis(bool asIndex, double xmin, double xmax)
+{
     xAsIndex = asIndex;
     _xmin = xmin;
     _xmax = xmax;
+}
 size_t FrameBufferSeries::size() const
+{
-    return _buffer->size();
+    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) / size() + _xmin, _buffer->sample(i));
+        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 = rect.left();
         int_index_end = rect.right();
+    }
     else
+    {
         double xsize = _xmax - _xmin;
         size_t bsize = _buffer->size();
         int_index_start =  bsize * (rect.left()-_xmin) / xsize;
         int_index_end = bsize * (rect.right()-_xmin) / xsize;
+    }
     int_index_start = std::max(int_index_start, (size_t) 0);
     int_index_end = std::min(_buffer->size(), int_index_end);
+}

src/framebufferseries.h

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@@ @@ -23,33 +23,37 @@ @@
 #include <QPointF>
 #include <QRectF>
 #include <qwt_series_data.h>
 #include "framebuffer.h"
 /**
  * This class provides an interface for actual FrameBuffer
  * object. That way we can keep our data structures relatively
  * isolated from Qwt. Otherwise QwtPlotCurve owns FrameBuffer
  * structures.
  */
 class FrameBufferSeries : public QwtSeriesData<QPointF>
+{
 public:
     FrameBufferSeries(FrameBuffer* buffer);
     /// Behavior of X axis
     void setXAxis(bool asIndex, double xmin, double xmax);
     // QwtSeriesData implementations
     size_t size() const;
     QPointF sample(size_t i) const;
     QRectF boundingRect() const;
     void setRectOfInterest(const QRectF& rect);
 private:
     FrameBuffer* _buffer;
     bool xAsIndex;
     double _xmin;
     double _xmax;
     size_t int_index_start; ///< starting index of "rectangle of interest"
     size_t int_index_end;   ///< ending index of "rectangle of interest"
 };
 #endif // FRAMEBUFFERSERIES_H

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