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116 lines
2.5 KiB
116 lines
2.5 KiB
#include "include/graphwidget.h"
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#include <QDebug>
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#include "include/node.h"
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#include "include/edge.h"
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#include "include/mainwindow.h"
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#include <math.h>
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const QColor GraphWidget::m_paperColor(255,255,153);
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GraphWidget::GraphWidget(MainWindow *parent)
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: QGraphicsView(parent)
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, m_parent(parent)
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{
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m_scene = new QGraphicsScene(this);
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m_scene->setItemIndexMethod(QGraphicsScene::NoIndex);
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m_scene->setSceneRect(-400, -400, 800, 800);
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setScene(m_scene);
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setCacheMode(CacheBackground);
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setViewportUpdateMode(BoundingRectViewportUpdate);
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setRenderHint(QPainter::Antialiasing);
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setTransformationAnchor(AnchorUnderMouse);
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setMinimumSize(400, 400);
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m_graphlogic = new GraphLogic(this);
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}
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void GraphWidget::newScene()
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{
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m_graphlogic->removeAllNodes();
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m_graphlogic->addFirstNode();
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this->show();
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}
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void GraphWidget::closeScene()
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{
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m_graphlogic->removeAllNodes();
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this->hide();
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}
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GraphLogic *GraphWidget::graphLogic() const
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{
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return m_graphlogic;
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}
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void GraphWidget::zoomIn()
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{
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scaleView(qreal(1.2));
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}
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void GraphWidget::zoomOut()
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{
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scaleView(qreal(1 / 1.2));
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}
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// MainWindow::keyPressEvent passes all keyevent to here, except
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// Ctrl + m (show/hide mainToolBar) and Ctrl + i (show/hide statusIconsToolbar)
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void GraphWidget::keyPressEvent(QKeyEvent *event)
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{
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// if GraphLogic handles the event then stop.
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if (m_graphlogic->processKeyEvent(event))
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return;
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if (event->key() == Qt::Key_Plus)
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{
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zoomIn();
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return;
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}
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if (event->key() == Qt::Key_Minus)
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{
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zoomOut();
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return;
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}
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QGraphicsView::keyPressEvent(event);
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}
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void GraphWidget::wheelEvent(QWheelEvent *event)
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{
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event->modifiers() & Qt::ControlModifier ?
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(event->delta() > 0 ?
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m_graphlogic->scaleUp() :
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m_graphlogic->scaleDown()) :
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(event->delta() > 0 ?
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zoomIn() :
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zoomOut());
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}
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void GraphWidget::drawBackground(QPainter *painter, const QRectF &rect)
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{
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Q_UNUSED(rect);
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painter->fillRect(m_scene->sceneRect(), GraphWidget::m_paperColor);
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painter->setBrush(Qt::NoBrush);
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painter->drawRect(m_scene->sceneRect());
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}
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void GraphWidget::scaleView(qreal scaleFactor)
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{
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qreal factor = transform().scale(scaleFactor, scaleFactor).
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mapRect(QRectF(0, 0, 1, 1)).width();
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// don't allow to scale up/down too much
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if (factor < 0.2 || factor > 10)
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return;
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scale(scaleFactor, scaleFactor);
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}
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