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CircleItem.cpp
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CircleItem.cpp
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#include "CircleItem.h"
#include <QCursor>
#include <QStyleOptionGraphicsItem>
#include <QGraphicsSceneMouseEvent>
#include <Qpainter>
#include <QDebug>
#include <QGraphicsScene>
#include <QGraphicsView>
qreal CircleItem::vecLenSqu(const CircleItem::vec_t & vec)
{
return vec.x()*vec.x() + vec.y()*vec.y();
}
void CircleItem::limitVec(CircleItem::vec_t & vec, qreal len)
{
auto x = vec.x(),y = vec.y();
auto vecLenSqu = x*x + y*y;
if (vecLenSqu > len*len)
{
qreal ratio = len / sqrt(vecLenSqu);
vec.setX(x*ratio);
vec.setY(y*ratio);
}
}
CircleItem::CircleItem(qreal rad, QColor c, QGraphicsItem * parent) :QGraphicsEllipseItem(0, 0, rad, rad, parent)
{
setPen(QPen(Qt::transparent,0));
setBrush(c);
setAcceptHoverEvents(true);
setFlags(ItemIsMovable | ItemSendsGeometryChanges);
mParent = nullptr;
}
void CircleItem::paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget)
{
painter->setCompositionMode(QPainter::CompositionMode_Plus);
painter->setBrush(QColor(255, 255, 255, 86));
painter->drawRect(QRect(diameter() / 2, diameter() / 2, 2, 2));
QGraphicsEllipseItem::paint(painter, option, widget);
}
QColor CircleItem::color() const
{
return brush().color();
}
QPointF CircleItem::centerPos() const
{
return pos() + QPointF(diameter() / 2, diameter() / 2);
}
void CircleItem::mousePressEvent(QGraphicsSceneMouseEvent * event)
{
setCursor(Qt::SizeAllCursor);
mOldMousePoint = mCurrentMousePoint = event->scenePos();
mOffset = event->scenePos() - pos();
QGraphicsEllipseItem::mousePressEvent(event);
}
void CircleItem::mouseReleaseEvent(QGraphicsSceneMouseEvent * event)
{
setCursor(Qt::PointingHandCursor);
QGraphicsEllipseItem::mouseReleaseEvent(event);
}
void CircleItem::mouseMoveEvent(QGraphicsSceneMouseEvent * event)
{
auto mousePos = event->scenePos();
auto myPos = this->scenePos();
mAcc = mousePos - myPos - mOffset;
limitVec(mAcc, 1);
mVel += mAcc;
limitVec(mVel,3);
QGraphicsItem::mouseMoveEvent(event);
}
void CircleItem::hoverEnterEvent(QGraphicsSceneHoverEvent * event)
{
setCursor(Qt::PointingHandCursor);
qDebug() << "mouse hover";
QGraphicsEllipseItem::hoverEnterEvent(event);
}
void CircleItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * event)
{
setCursor(Qt::ArrowCursor);
qDebug() << "mouse leave";
QGraphicsEllipseItem::hoverLeaveEvent(event);
}
QVariant CircleItem::itemChange(GraphicsItemChange change, const QVariant & value)
{
//from Qt Doc
if (change == ItemPositionChange && scene()) {
// value is the new position.
auto newPos = value.toPointF();
auto allViews = this->scene()->views();
if (!allViews.empty())
{
auto firstView = allViews[0];
QRectF rect = firstView->rect();
if ( newPos.x() > rect.width())
newPos.setX(-diameter());
if ( newPos.x()< -diameter())
newPos.setX(rect.width());
if ( newPos.y() > rect.height())
newPos.setY(-diameter());
if (newPos.y()< -diameter())
newPos.setY(rect.height());
return newPos;
}
}
return QGraphicsItem::itemChange(change, value);
}
qreal CircleItem::diameter() const
{
return rect().width();
}