ui: Save graph as image via context menu

bug id = 180

src/lib_gui/qt/graphics/QtGraphicsView.cpp

@@ -1,5 +1,6 @@
 #include "qt/graphics/QtGraphicsView.h"
 
+#include <QFileDialog>
 #include <QMouseEvent>
 #include <QScrollBar>
 #include <QTimer>
@@ -7,6 +8,8 @@
 #include <QPropertyAnimation>
 #include <QParallelAnimationGroup>
 
+#include "qt/utility/QtContextMenu.h"
+
 QtGraphicsView::QtGraphicsView(QWidget* parent)
 	: QGraphicsView(parent)
 	, m_zoomFactor(1.0f)
@@ -25,6 +28,11 @@ QtGraphicsView::QtGraphicsView(QWidget* parent)
 	m_timerStopper = std::make_shared<QTimer>(this);
 	m_timerStopper->setSingleShot(true);
 	connect(m_timerStopper.get(), SIGNAL(timeout()), this, SLOT(stopTimer()));
+
+	m_exportGraphAction = new QAction(tr("Save as Image"), this);
+	m_exportGraphAction->setStatusTip(tr("Save this graph as image file"));
+	m_exportGraphAction->setToolTip(tr("Save this graph as image file"));
+	connect(m_exportGraphAction, SIGNAL(triggered()), this, SLOT(exportGraph()));
 }
 
 float QtGraphicsView::getZoomFactor() const
@@ -169,6 +177,11 @@ void QtGraphicsView::wheelEvent(QWheelEvent* event)
 	QGraphicsView::wheelEvent(event);
 }
 
+void QtGraphicsView::contextMenuEvent(QContextMenuEvent* event)
+{
+	QtContextMenu::getInstance()->showExtended(event, this, std::vector<QAction*>(1, m_exportGraphAction));
+}
+
 void QtGraphicsView::updateTimer()
 {
 	float ds = 30.0f;
@@ -231,6 +244,27 @@ void QtGraphicsView::stopTimer()
 	m_timer->stop();
 }
 
+void QtGraphicsView::exportGraph()
+{
+	QString fileName = QFileDialog::getSaveFileName(
+		this, "Save image", QDir::homePath(), "PNG (*.png);;JPEG (*.JPEG);;BMP Files (*.bmp)");
+
+	if (!fileName.isNull())
+	{
+		QImage image(scene()->sceneRect().size().toSize(), QImage::Format_ARGB32);
+		image.fill(Qt::transparent);
+
+		QPainter painter(&image);
+		painter.setRenderHint(QPainter::Antialiasing);
+		scene()->render(&painter);
+		image.save(fileName);
+
+		// different approach
+		// QPixmap pixMap = grab();
+		// pixMap.save(fileName);
+	}
+}
+
 bool QtGraphicsView::moves() const
 {
 	return m_up || m_down || m_left || m_right;

src/lib_gui/qt/graphics/QtGraphicsView.h

@@ -31,6 +31,8 @@ protected:
 
 	void wheelEvent(QWheelEvent* event);
 
+	void contextMenuEvent(QContextMenuEvent* event);
+
 signals:
 	void emptySpaceClicked();
 
@@ -38,6 +40,8 @@ private slots:
 	void updateTimer();
 	void stopTimer();
 
+	void exportGraph();
+
 private:
 	bool moves() const;
 
@@ -57,6 +61,8 @@ private:
 
 	std::shared_ptr<QTimer> m_timer;
 	std::shared_ptr<QTimer> m_timerStopper;
+
+	QAction* m_exportGraphAction;
 };
 
 #endif // QT_GRAPHICS_VIEW_H