PlotterHMI/datafile/view/mygraphicsitem.cpp

#include "mygraphicsitem.h"

MyGraphicsItem::MyGraphicsItem()
{
    m_point.setX(0);
    m_point.setY(0);
    m_fileType = TYPE_FILE;

    //使item可以被选择
    //this->setFlag(QGraphicsItem::ItemIsSelectable);
    //使item可以移动
    //this->setFlag(QGraphicsItem::ItemIsMovable);
    //item可以响应鼠标事件
    //this->setAcceptHoverEvents(true);
}

MyGraphicsItem::~MyGraphicsItem()
{
}

void MyGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    return QGraphicsItem::mousePressEvent(event);
}

void MyGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    return QGraphicsItem::mouseMoveEvent(event);
}

void MyGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    return QGraphicsItem::mouseReleaseEvent(event);
}

QPicture MyGraphicsItem::getPictureByDat(Marker marker,int penWidth)
{
    m_fileType = TYPE_FILE;
    if(penWidth != 1)
    {
        QPicture pic;
        pic = creatPictureByData(marker,m_drawPath,penWidth);
        m_boundingRect = pic.boundingRect();
        return pic;
    }
    return m_picture;
}

QPicture MyGraphicsItem::getPictureByBmp(QPixmap pixmap,int penWidth)
{
    m_fileType = TYPE_IMAGE;
    m_picture = creatPictureByBmp(pixmap,penWidth);
    m_boundingRect = m_picture.boundingRect();
    return m_picture;
}

QPainterPath MyGraphicsItem::getDrawPath()
{
    return m_drawPath;
}

void MyGraphicsItem::setPicture(QPicture pic)
{
    m_fileType = TYPE_IMAGE;
    m_picture = pic;
    // 外矩形
    m_boundingRect = m_picture.boundingRect();
    update();
}

void MyGraphicsItem::setPaintPath(QPainterPath path)
{
    m_fileType = TYPE_FILE;
    m_drawPath = path;
    m_boundingRect = m_drawPath.boundingRect();
    update();
}

void MyGraphicsItem::setPaintPathAndPic(QPainterPath path, QPicture pic)
{
    m_fileType = TYPE_FILE;
    m_drawPath = path;
    m_picture = pic;
    m_boundingRect = m_drawPath.boundingRect();
    update();
}

void MyGraphicsItem::reflushBlockPos(QPoint p)
{
    m_point = p;

    m_blockPixmap = QPixmap(PIXMAPWIDTH,m_picture.height());
    m_blockPixmap.fill(Qt::transparent);//透明色
    if(m_point.x() >= 0 && m_point.y() >= 0)
    {
        QPainter painter(&m_blockPixmap);
        painter.setCompositionMode(QPainter::CompositionMode_Source);
        painter.fillRect(m_blockPixmap.rect(), QColor(0, 0, 0, 80));
        painter.end();
    }
    update();
}

QRectF MyGraphicsItem::boundingRect() const
{
    return m_boundingRect;
}

void MyGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_UNUSED(option);
    Q_UNUSED(widget);

    QPen pen;
    QBrush brush;
    brush.setStyle(Qt::SolidPattern);
    pen.setWidth(1);

    // 获取当前的变换矩阵
    QTransform transform = painter->worldTransform();
    double scaleFactor = std::sqrt(transform.m11() * transform.m11() +
                                   transform.m22() * transform.m22());

    double width = pen.width()/scaleFactor;
    pen.setWidthF(width);      // 线段保持原来的线宽
    pen.setColor(QColor(Qt::black));
    brush.setColor(QColor(255,255,255));

    painter->setPen(pen);
    painter->setBrush(brush);

    //防锯齿，效果不好，所以注释掉
//    painter->setRenderHint(QPainter::Antialiasing, true);
//    painter->setRenderHint(QPainter::SmoothPixmapTransform, true);

    //用MyGraphicsItem画图缩放时如果笔宽不为1，直接画QPicture时线条会很轻，所以用m_drawPath绘制，pic就为原笔宽pic
    //文件类型用m_drawPath，图片类型为m_picture
    if(m_fileType == TYPE_FILE)
    {
        painter->drawPath(m_drawPath);
    }
    else if(m_fileType == TYPE_IMAGE)
    {
        painter->drawPicture(0,0,m_picture);
    }
    painter->drawPixmap(m_point.x(),m_point.y(),m_blockPixmap);
}