#include "CameraItemView.h"
#include "MfcLabel.h"
#include <qgraphicsitem.h>

CameraItemView::CameraItemView(QWidget* parent)
{
	//set the flags
	m_bMousePressed = false;
	//set the scale
	m_fViewScaleX = 1.0f;
	m_fViewScaleY = 1.0f;


	//set the parent pointer
	this->setParent(parent);

    //get the view port center
    m_ViewCenterPoint = this->viewport()->rect().center();

    this->scale(m_fViewScaleX, m_fViewScaleY);
}

CameraItemView::~CameraItemView()
{

}

void CameraItemView::mousePressEvent(QMouseEvent* event)
{
    
    m_bMousePressed = true;
    QPoint Pt = event->pos();
    //MfcLabel::fRect CurrentViewRect = this->geometry();
    if (m_bMousePressed && (event->buttons() & Qt::LeftButton))//&& CurrentViewRect.JudgePtInRectBoxOrNot(MfcLabel::fPoint(Pt.x(),Pt.y())))
    {
        m_ViewCenterPoint = mapToScene(event->pos()) - event->pos() + QPointF(width() / 2, height() / 2);
        m_MousePressPoint = Pt;
    }

    if (event->buttons() & Qt::RightButton) {
        // 鼠标右键被点击，执行相应的操作
        
        QGraphicsItem* Item = nullptr;

        foreach(QGraphicsItem * item, scene()->items())
        {
            if (item->isSelected())
            {
				Item = item;
				break;
			}
		}

        if (Item == nullptr)
            Item = scene()->items().front();
        
        centerOn(Item);
        m_fViewScaleX = 2 / m_fViewScaleX;
        m_fViewScaleY = 2 / m_fViewScaleY;
       
        scale(m_fViewScaleX, m_fViewScaleY);

        m_fViewScaleX = 2;
        m_fViewScaleY = 2;

    }

    QGraphicsView::mousePressEvent(event);
}

void CameraItemView::mouseReleaseEvent(QMouseEvent* event)
{
	m_bMousePressed = false;
	m_MousePressPoint = QPoint(0, 0);
}

void CameraItemView::mouseMoveEvent(QMouseEvent* event)
{
    QPoint Pt = event->pos();
    MfcLabel::fRect CurrentViewRect = this->geometry();
    if (m_bMousePressed)//&& CurrentViewRect.JudgePtInRectBoxOrNot(MfcLabel::fPoint(Pt.x(), Pt.y())))
    {
        QPoint CurrentPoint = Pt;
        CurrentPoint = CurrentPoint - m_MousePressPoint.toPoint();
        m_MouseMoveCurrentPoint = CurrentPoint;
        //m_ViewCenterPoint = m_ViewCenterPoint - m_MouseMoveCurrentPoint;
        //QPoint CurrentTopLeftPt = this->viewport()->rect().topLeft();
        this->centerOn(m_ViewCenterPoint);

        setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
        centerOn(m_ViewCenterPoint - m_MouseMoveCurrentPoint);
    }
    
}

void CameraItemView::wheelEvent(QWheelEvent* event)
{
    QPoint Pt = event->pos();
    MfcLabel::fRect ViewPortRect;// GraphicsRect, GraphicsRect2;
    ViewPortRect = this->geometry();

    if (event->delta() < 0)
    {
        if (m_fViewScaleX < 0.2 || m_fViewScaleY <0.2)
            return;
        m_fViewScaleX /= 2;
        m_fViewScaleY /= 2;
        this->scale(0.5, 0.5);
    }
    else if(event->delta() > 0)
    {
        if (m_fViewScaleX > 2 || m_fViewScaleY > 2)
            return;
        m_fViewScaleX *= 2;
        m_fViewScaleY *= 2;
        this->scale(2, 2);
    }
    

}