From d4f10f9fe446da2aff65088e5236d6ffcdd034b5 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Fri, 24 Feb 2017 12:33:55 +0100
Subject: initial commit

---
 src/graphwidget.cpp | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 src/graphwidget.cpp

(limited to 'src/graphwidget.cpp')

diff --git a/src/graphwidget.cpp b/src/graphwidget.cpp
new file mode 100644
index 0000000..ec15026
--- /dev/null
+++ b/src/graphwidget.cpp
@@ -0,0 +1,95 @@
+#include "graphwidget.h"
+#include "datasource/idatasource.h"
+#include <QDebug>
+#include <QResizeEvent>
+#include <QPaintEvent>
+#include <QPainter>
+
+const QColor GraphWidget::LINE_COLOR = QColor::fromRgb(20, 255, 80);
+const QColor GraphWidget::BACK_COLOR = QColor::fromRgb(10, 0, 20);
+const QColor GraphWidget::BAR_COLOR = QColor::fromRgb(200, 200, 200);
+
+GraphWidget::GraphWidget(QWidget* parent)
+	: QWidget(parent),
+	  _source(NULL),
+	  _histPos(0),
+	  _vScale(0),
+	  _doubleSpace(false)
+{
+	memset(_history, 0, sizeof(*_history) * HISTSIZE);
+}
+
+GraphWidget::~GraphWidget()
+{
+	delete _source;
+}
+
+void GraphWidget::setDataSource(IDataSource* source)
+{
+	delete _source;
+	_source = source;
+	memset(_history, 0, sizeof(*_history) * HISTSIZE);
+	_vScale = (float)height() / (float)_source->getMaximum();
+	qDebug() << "sDS " << _vScale;
+	update();
+}
+
+void GraphWidget::readNextValue()
+{
+	if (_source == NULL)
+		return;
+	//
+	_history[_histPos] = _source->read();
+	_histPos = (_histPos + 1) % HISTSIZE;
+	if (_doubleSpace && _histPos % 2 == 1) {
+		_history[_histPos] = _history[(_histPos + HISTSIZE - 1) % HISTSIZE];
+		update(_updateRectSmall);
+	} else {
+		update();
+	}
+}
+
+void GraphWidget::resizeEvent(QResizeEvent * event)
+{
+	const QSize &size = event->size();
+	_updateRectSmall = QRect(size.width() - 1, 0, 1, size.height());
+	if (_source != NULL) {
+		_vScale = (float)size.height() / (float)_source->getMaximum();
+	}
+	_doubleSpace = (width() < 400);
+	update();
+}
+
+void GraphWidget::paintEvent(QPaintEvent * event)
+{
+	qint64 value;
+	int x, y;
+	const QRect &rect = event->rect();
+	QPainter painter;
+	painter.begin(this);
+	painter.fillRect(rect, BACK_COLOR);
+	if (_source == NULL)
+		return;
+	painter.setPen(LINE_COLOR);
+	const int offset = HISTSIZE + HISTSIZE + _histPos - (this->width() - rect.x()) * (_doubleSpace ? 2 : 1);
+	// TODO: double space
+	for (int index = 0; index < rect.width(); ++index) {
+		x = rect.x() + index;
+		if (_doubleSpace) {
+			value = (_history[(offset + index * 2) % HISTSIZE] + _history[(offset + index * 2 + 1) % HISTSIZE]) / 2;
+		} else {
+			value = _history[(offset + index) % HISTSIZE];
+		}
+		y = height() - int(value * _vScale);
+		painter.drawLine(x, y, x, height());
+	}
+	const QList<qint64> &bars = _source->getBars();
+	if (!bars.empty()) {
+		painter.setPen(BAR_COLOR);
+		for (QList<qint64>::const_iterator it = bars.begin(); it != bars.end(); ++it) {
+			y = height() - int(*it * _vScale);
+			painter.drawLine(rect.left(), y, rect.right() + 1, y);
+		}
+	}
+	painter.end();
+}
-- 
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