131 lines
3.3 KiB
C++
131 lines
3.3 KiB
C++
#include "stdafx.h"
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#include "imagerSimulatioin.h"
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imagerSimulatioin::imagerSimulatioin(QGraphicsItem *parent) :QGraphicsItem(parent)
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{
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/*this->setFlag(QGraphicsItem::ItemIsSelectable);
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this->setFlag(QGraphicsItem::ItemIsMovable);*/
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setFlags(ItemIsSelectable | ItemIsMovable);
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//itemChange需要：ItemSendsGeometryChanges flag is needed to capture the change in position of QGraphicsItem
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this->setFlag(QGraphicsItem::ItemSendsScenePositionChanges);
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m_height = 50;
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m_width = 50;
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}
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imagerSimulatioin::~imagerSimulatioin()
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{
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}
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QRectF imagerSimulatioin::boundingRect() const
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{
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qreal penWidth = 1;
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return QRectF(-10 - penWidth / 2, -10 - penWidth / 2,
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20 + penWidth, 20 + penWidth);
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}
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void imagerSimulatioin::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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QBrush blueBrush(Qt::green);
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QColor blue(32, 159, 223);
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blueBrush.setColor(blue);
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QPen outlinePen(Qt::black);
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painter->setPen(outlinePen);
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painter->setBrush(blueBrush);
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painter->drawRect(-m_width / 2, -m_height / 2, m_width, m_height);//可以改变item坐标原点，和setSceneRect(qreal x, qreal y, qreal w, qreal h)一样
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//QPen outlinePen(Qt::red);
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painter->drawPoint(0, 0);
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painter->drawEllipse(QPoint(0, 0), 10, 10);
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//painter->drawRoundedRect(-10, -10, 100, 100, 5, 5);
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}
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void imagerSimulatioin::setPos(qreal x, qreal y)
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{
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if (x>0)
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{
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x = -x;
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}
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if (y>0)
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{
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y = -y;
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}
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x = floor(x);
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y = floor(y);
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QGraphicsItem::setPos(x, y);//调用父类被覆盖的函数执行相应操作
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scene()->update();
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}
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QVariant imagerSimulatioin::itemChange(GraphicsItemChange change, const QVariant &value)
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{
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if (change == ItemPositionChange && scene())
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{
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// value is the new position.
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QPointF newPos = value.toPointF();
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QRectF rect = scene()->sceneRect();
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if (!rect.contains(newPos))
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{
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// Keep the item inside the scene rect.
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newPos.setX(qMin(rect.right(), qMax(newPos.x(), rect.left())));
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newPos.setY(qMin(rect.bottom(), qMax(newPos.y(), rect.top())));
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//qDebug() << "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
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return newPos;
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}
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}
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//qDebug() << "---------------";
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return QGraphicsItem::itemChange(change, value);
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}
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void imagerSimulatioin::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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scene()->update();
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QPointF originOfItem = this->scenePos();//这是item左上角在scene中的坐标
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//qDebug() << originOfItem;
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QGraphicsItem::mouseMoveEvent(event);
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}
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void imagerSimulatioin::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
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{
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QPointF x = pos();//这是item原点（0，0）在scene中的坐标
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QPointF originOfItem = this->scenePos();//这是item原点（0，0）在scene中的坐标
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QPointF viewPos = event->pos();
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//qDebug() << "---------------event coordinate: " << x;
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//qDebug() << "---------------event coordinate: " << viewPos;
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//qDebug() << "---------------event scene coordinate: " << this->mapToScene(viewPos);
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//qDebug() << "---------------imagerSimulatioin origin coordinate: " << originOfItem;
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//qDebug() << "---------------imagerSimulatioin center coordinate: " << centerOfItem;
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qDebug() << "---------------imagerSimulatioin origin coordinate: " << originOfItem;
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emit leftMouseButtonPressed(originOfItem.x(), originOfItem.y());
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//update();//不会实时绘制
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scene()->update();
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QGraphicsItem::mouseReleaseEvent(event);
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}
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