#include "graphicsItem/electricSvgItem.h"
#include "graphicsItem/itemControlHandle.h"

#include <QPainter>
#include <QStyleOption>
#include <QSvgRenderer>
#include <QDebug>

ElectricSvgItem::ElectricSvgItem(const QRect &rect, QGraphicsItem *parent)
    : GraphicsBaseItem(parent),m_pRender(nullptr)
{
    m_lastBoudingRect = rect;
    m_boundingRect = rect;
    m_dWidth = rect.width();
    m_dHeight = rect.height();
}

ElectricSvgItem::~ElectricSvgItem()
{

}

QPainterPath ElectricSvgItem::shape()
{
    QPainterPath path;
    double dHandleX = 0.0;
    double dHandleY = 0.0;
    path.addRect(m_boundingRect);
    return path;
}

void ElectricSvgItem::updateCoordinate() //当执行了resie和editShape函数后，boundingRect发生了变换，需要将item的原点(以中心点为原点)校准至boundingRect.center()
{
    if (!parentItem())
    {
        QPointF pt1, pt2, delta;
        pt1 = mapToScene(QPointF(0, 0));
        pt2 = mapToScene(m_boundingRect.center());
        delta = pt1 - pt2;

        prepareGeometryChange();
        //将boundingRect设置成中心点和原点（也是默认变换原点），这样三点重合，有助于简化计算
        m_boundingRect = QRectF(-m_dWidth / 2, -m_dHeight / 2, m_dWidth, m_dHeight);
        //setTransformOriginPoint(m_boundingRect.center()); //变换中心默认为item的(0,0)点，所以不执行这句话也没有问题
        //更新bouondingRect后重回会显示位置会有变化，需要做对应的移动
        moveBy(-delta.x(), -delta.y());
        updateHandles();
    }

    m_lastBoudingRect = m_boundingRect;
}

void ElectricSvgItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
{
    if(m_pRender)
    {
        m_pRender->render(painter,m_boundingRect);
    }

    painter->setPen(m_pen);
    painter->setBrush(m_brush);
    if(m_state == S_lineOut)
    {
        painter->setPen(QPen(QColor(255,51,153,180)));
        painter->drawLine(m_beginConnectPoint,m_endConnectPoint);
    }

    if (option->state & QStyle::State_Selected) //是选中状态,绘制选中框
    {
        int nPenWidth = 1;
        painter->setPen(QPen(QColor(135,206,235,180))); //蓝色的外框

        painter->setBrush(QBrush(QColor(135,206,235,180)));

        double dx = m_boundingRect_selected.x();
        double dy = m_boundingRect_selected.y();
        double dWidth = m_boundingRect_selected.width();
        double dHeight = m_boundingRect_selected.height();


        //画弧线0度是3点钟方向
        if(dWidth > dHeight)
        {
            painter->drawRect(m_boundingRect_selected);
            painter->drawChord(dx-dHeight*0.5,dy,dHeight,dHeight,90*16,180*16);
            painter->drawChord(dx+dWidth-dHeight*0.5,dy,dHeight,dHeight,(-90)*16,180*16);
        }
        else if(dWidth < dHeight)
        {
            painter->drawRect(m_boundingRect_selected);
            painter->drawChord(dx,dy-dWidth*0.5,dWidth,dWidth,0*16,180*16);
            painter->drawChord(dx,dy+dHeight-dWidth*0.5,dWidth,dWidth,180*16,180*16);
            //painter->drawChord(dx+dWidth-dHeight*0.5,dy,dHeight,dHeight,(-90)*16,180*16);
        }
        else
        {
            painter->drawEllipse(QPointF(dx+dWidth*0.5,dy+dHeight*0.5),dHeight*0.5,dHeight*0.5);
        }

        //绘制变换原点
        QPointF originPoint = transformOriginPoint();
        //qDebug() << "originPoint:" << originPoint;
        painter->setBrush(Qt::red);
        painter->drawEllipse(originPoint, 4, 4);
    }
}

void ElectricSvgItem::loadSvg(const QString& str)
{
    m_pRender = new QSvgRenderer(str);
}

void ElectricSvgItem::resize(int nHandle,double dSX, double dSY, const QPointF& basePoint)
{
    switch (nHandle)
    {
    case H_left:
    case H_right:
        dSY = 1; //拖拽的是左点右点，为水平缩放，忽略垂直变化
        break;
    case H_top:
    case H_bottom:
        dSX = 1; //拖拽的是顶点底点，为垂直缩放，忽略水平变化
        break;
    default:
        break;
    }

    QTransform trans;
    //缩放是以图元原点（中心）位置为基准，所以每帧都先移动移动到想要的基准点，缩放之后再移回
    trans.translate(basePoint.x(), basePoint.y());
    trans.scale(dSX, dSY);
    trans.translate(-basePoint.x(), -basePoint.y());

    prepareGeometryChange();
    m_boundingRect = trans.mapRect(m_lastBoudingRect);
    m_dWidth = m_boundingRect.width();
    m_dHeight = m_boundingRect.height();
    updateHandles();
}

void ElectricSvgItem::move(const QPointF& point)
{
    moveBy(point.x(), point.y());
}

void ElectricSvgItem::editShape(int nHandle,const QPointF& ptMouse)
{
    prepareGeometryChange();
    updateHandles();
}