#include "myview.h"
#include <QScrollBar>
#include <iostream>
#define VIEW_CENTER viewport()->rect().center()
const double PI = 3.1415926535898;

MyView::MyView(QWidget *parent) :
     QGraphicsView(parent),
    beishu(1.00000)
{
    setDragMode(QGraphicsView::ScrollHandDrag);
}

void MyView::mousePressEvent(QMouseEvent *event)
{
//    qDebug("x is %d",event->pos().x());
    bottonstatus = true;
    QGraphicsView::mousePressEvent(event);
}
void MyView::mouseMoveEvent(QMouseEvent *event)
{
    QGraphicsView::mouseMoveEvent(event);

//    QScrollBar * ps = verticalScrollBar();
//    std::cout<<" size is "<<ps->size().height()<<" v = "<<ps->value()<<std::endl;
//    QScrollBar * ps2= horizontalScrollBar();
//     std::cout<<" size is "<<ps2->size().width()<<" h = "<<ps2->value()<<std::endl;
}
void MyView::mouseReleaseEvent(QMouseEvent *event)
{
    bottonstatus = false;
    QGraphicsView::mouseReleaseEvent(event);
}

// 放大/缩小
void MyView::wheelEvent(QWheelEvent *event)
{
    // 滚轮的滚动量
    QPoint scrollAmount = event->angleDelta();
    // 正值表示滚轮远离使用者（放大），负值表示朝向使用者（缩小）
    scrollAmount.y() > 0 ? zoomIn() : zoomOut();
}


// 放大
void MyView::zoomIn()
{

    int width,hgt;
    width = sceneRect().width();
    hgt = sceneRect().height();
    QScrollBar * psV = verticalScrollBar();
    QScrollBar * psH = horizontalScrollBar();


//    qDebug("%d %d ",width,hgt);


    int centery = (psV->value() + psV->size().height()/2)/beishu;
    int centerx = (psH->value() + psH->size().width()/2)/beishu;

    scale(1.1, 1.1);
    beishu *= 1.1;
 //   centerOn(450, 700 - (200 / beishu));



//    qDebug("beishu is %f",beishu);

    centerOn(centerx,centery);



//    QPoint x = viewport()->rect().center();


//    std::cout<<" x is"<<sceneRect().bottom()<<" y is "<<sceneRect().y()<<std::endl;
//    QScrollBar * ps = verticalScrollBar();
//    std::cout<<" size is "<<ps->size().height()<<" v = "<<ps->value()<<std::endl;

}

// 缩小
void MyView::zoomOut()
{

    int width,hgt;
    width = sceneRect().width();
    hgt = sceneRect().height();
    QScrollBar * psV = verticalScrollBar();
    QScrollBar * psH = horizontalScrollBar();

    int centery = (psV->value() + psV->size().height()/2)/beishu;
    int centerx = (psH->value() + psH->size().width()/2)/beishu;

    scale(1 / 1.1, 1 / 1.1);
    beishu /= 1.1;
//    centerOn(450, 700 - (200 / beishu));


    centerOn(centerx,centery);
}

void MyView::zoomone()
{

    scale(1 /beishu, 1 / beishu);
    beishu  = 1.0;

}

void MyView::mouseDoubleClickEvent(QMouseEvent *event)
{

    QScrollBar * psV = verticalScrollBar();
    QScrollBar * psH = horizontalScrollBar();

    int centery = (psV->value() + psV->size().height()/2)/beishu;
    int centerx = (psH->value() + psH->size().width()/2)/beishu;


//    qDebug("x is %d y is %d view center x is %d  centerx is %d",event->pos().x(),
//           event->pos().y(),
//           viewport()->rect().center().x(),centerx);

    int viewx,viewy;
    if(beishu == 0)return;
    viewx = centerx +(event->pos().x() - viewport()->rect().center().x())/beishu;
    viewy = centery +(event->pos().y() - viewport()->rect().center().y())/beishu;

    QPoint viewpoint;
    viewpoint.setX(viewx);
    viewpoint.setY(viewy);

    emit dbclickxy(viewx,viewy);
    qDebug("view x is %d view y is %d ",viewx,viewy);
}