DiagramDesigner/diagramCavas/source/graphicsItem/electricSvgGroup.cpp

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

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

ElectricSvgGroup::ElectricSvgGroup(const QRect &rect,QGraphicsItem *parent)
    : GraphicsProjectModelGroup(parent)
{
    m_lastBoudingRect = rect;
    m_boundingRect = rect;
    m_dWidth = rect.width();
    m_dHeight = rect.height();
}

ElectricSvgGroup::ElectricSvgGroup(const ElectricSvgGroup& obj)
    : GraphicsProjectModelGroup(obj)
{
    m_lastBoudingRect = obj.m_lastBoudingRect;
    m_boundingRect = obj.m_boundingRect;
    m_dWidth = obj.m_dWidth;
    m_dHeight = obj.m_dHeight;
    m_mapSvg = obj.m_mapSvg;
}

ElectricSvgGroup::~ElectricSvgGroup()
{

}

ElectricSvgGroup* ElectricSvgGroup::clone() const
{
    return new ElectricSvgGroup(*this);
}

QPainterPath ElectricSvgGroup::shape()
{
    QPainterPath path;
    path.addRect(m_boundingRect);
    return path;
}

void ElectricSvgGroup::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 ElectricSvgGroup::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
{
    painter->setPen(m_pen);
    painter->setBrush(m_brush);
    if(m_state == S_prepareConnect)
    {
        painter->setPen(QPen(QColor(255,51,153,180)));
        painter->drawLine(m_beginConnectPoint,m_endConnectPoint);
    }
    if(m_touched)
    {
        painter->setPen(QPen(QColor(238,58,140,220)));
        painter->drawRect(m_boundingRect);
    }

    if (option->state & QStyle::State_Selected) //是选中状态,绘制选中框
    {
        renderSelectBackground(painter);
    }
}

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

void ElectricSvgGroup::updateMapSvg(QMap<QString,QByteArray> map)
{
    m_mapSvg = map;
}

void ElectricSvgGroup::addSvgItem(ElectricSvgItem* item)
{
    item->setParentItem(this); // 关键：设置父项
    m_childItems.append(item);
    updateLayout();
}

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