diff --git a/src/barchart.cpp b/src/barchart.cpp
new file mode 100644
--- /dev/null
+++ b/src/barchart.cpp
@@ -0,0 +1,96 @@
+/*
+  Copyright © 2018 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 <QPalette>
+#include <qwt_scale_map.h>
+
+#include "barchart.h"
+
+BarChart::BarChart(const Stream* stream)
+{
+    _stream = stream;
+    setSpacing(0);
+}
+
+void BarChart::resample()
+{
+    setSamples(chartData());
+}
+
+QVector<double> BarChart::chartData() const
+{
+    unsigned numChannels = _stream->numChannels();
+    unsigned numSamples = _stream->numSamples();
+    QVector<double> data(numChannels);
+    for (unsigned i = 0; i < numChannels; i++)
+    {
+        data[i] = _stream->channel(i)->yData()->sample(numSamples-1);
+    }
+    return data;
+}
+
+QwtColumnSymbol* BarChart::specialSymbol(int sampleIndex, const QPointF& sample) const
+{
+    unsigned numChannels = _stream->numChannels();
+    if (sampleIndex < 0 || sampleIndex > (int) numChannels)
+    {
+        return NULL;
+    }
+
+    auto color = _stream->channel(sampleIndex)->color();
+
+    QwtColumnSymbol* symbol = new QwtColumnSymbol(QwtColumnSymbol::Box);
+    symbol->setLineWidth(1);
+    symbol->setFrameStyle(QwtColumnSymbol::Plain);
+    symbol->setPalette(QPalette(color));
+
+    return symbol;
+}
+
+void BarChart::drawSample(
+        QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect, const QwtInterval &boundingInterval,
+        int index, const QPointF &sample ) const
+{
+    QwtPlotBarChart::drawSample(painter, xMap, yMap, canvasRect, boundingInterval, index, sample);
+
+    // calculate bar size
+    const double barWidth = sampleWidth(xMap, canvasRect.width(),
+                                        boundingInterval.width(), sample.y());
+    const double x = xMap.transform( sample.x() );
+    const double x1 = x - 0.5 * barWidth;
+    // const double x2 = x + 0.5 * barWidth;
+
+    const double y1 = yMap.transform(baseline());
+    const double y2 = yMap.transform(sample.y());
+    const double barHeight = fabs(y2 - y1);
+
+    // create and calculate text size
+    const auto valueStr = QString::number(sample.y());
+    auto valueText = QwtText(valueStr, QwtText::PlainText);
+    const auto textSize = valueText.textSize();
+    auto r = QRectF(x1, y2, barWidth, textSize.height());
+    if (y2 > y1) r.moveBottom(y2);
+
+    // display text if there is enough space
+    if (barHeight >= textSize.height() && barWidth >= textSize.width())
+    {
+        valueText.draw(painter, r);
+    }
+}