148 lines
3.7 KiB
C++
148 lines
3.7 KiB
C++
#include "mygraphicsitem.h"
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MyGraphicsItem::MyGraphicsItem()
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{
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m_point.setX(0);
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m_point.setY(0);
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m_fileType = TYPE_FILE;
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//使item可以被选择
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//this->setFlag(QGraphicsItem::ItemIsSelectable);
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//使item可以移动
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//this->setFlag(QGraphicsItem::ItemIsMovable);
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//item可以响应鼠标事件
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//this->setAcceptHoverEvents(true);
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}
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MyGraphicsItem::~MyGraphicsItem()
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{
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}
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void MyGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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return QGraphicsItem::mousePressEvent(event);
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}
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void MyGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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return QGraphicsItem::mouseMoveEvent(event);
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}
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void MyGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
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{
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return QGraphicsItem::mouseReleaseEvent(event);
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}
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QPicture MyGraphicsItem::getPictureByDat(Marker marker,int penWidth)
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{
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m_fileType = TYPE_FILE;
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if(penWidth != 1)
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{
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QPicture pic;
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pic = creatPictureByData(marker,m_drawPath,penWidth);
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m_boundingRect = pic.boundingRect();
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return pic;
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}
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return m_picture;
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}
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QPicture MyGraphicsItem::getPictureByBmp(QPixmap pixmap,int penWidth)
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{
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m_fileType = TYPE_IMAGE;
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m_picture = creatPictureByBmp(pixmap,penWidth);
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m_boundingRect = m_picture.boundingRect();
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return m_picture;
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}
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QPainterPath MyGraphicsItem::getDrawPath()
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{
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return m_drawPath;
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}
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void MyGraphicsItem::setPicture(QPicture pic)
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{
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m_fileType = TYPE_IMAGE;
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m_picture = pic;
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// 外矩形
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m_boundingRect = m_picture.boundingRect();
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update();
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}
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void MyGraphicsItem::setPaintPath(QPainterPath path)
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{
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m_fileType = TYPE_FILE;
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m_drawPath = path;
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m_boundingRect = m_drawPath.boundingRect();
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update();
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}
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void MyGraphicsItem::setPaintPathAndPic(QPainterPath path, QPicture pic)
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{
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m_fileType = TYPE_FILE;
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m_drawPath = path;
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m_picture = pic;
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m_boundingRect = m_drawPath.boundingRect();
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update();
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}
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void MyGraphicsItem::reflushBlockPos(QPoint p)
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{
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m_point = p;
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m_blockPixmap = QPixmap(PIXMAPWIDTH,m_picture.height());
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m_blockPixmap.fill(Qt::transparent);//透明色
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if(m_point.x() >= 0 && m_point.y() >= 0)
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{
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QPainter painter(&m_blockPixmap);
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painter.setCompositionMode(QPainter::CompositionMode_Source);
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painter.fillRect(m_blockPixmap.rect(), QColor(0, 0, 0, 80));
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painter.end();
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}
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update();
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}
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QRectF MyGraphicsItem::boundingRect() const
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{
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return m_boundingRect;
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}
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void MyGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(option);
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Q_UNUSED(widget);
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QPen pen;
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QBrush brush;
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brush.setStyle(Qt::SolidPattern);
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pen.setWidth(1);
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// 获取当前的变换矩阵
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QTransform transform = painter->worldTransform();
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double scaleFactor = std::sqrt(transform.m11() * transform.m11() +
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transform.m22() * transform.m22());
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double width = pen.width()/scaleFactor;
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pen.setWidthF(width); // 线段保持原来的线宽
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pen.setColor(QColor(Qt::black));
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brush.setColor(QColor(255,255,255));
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painter->setPen(pen);
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painter->setBrush(brush);
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//防锯齿，效果不好，所以注释掉
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// painter->setRenderHint(QPainter::Antialiasing, true);
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// painter->setRenderHint(QPainter::SmoothPixmapTransform, true);
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//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
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//文件类型用m_drawPath，图片类型为m_picture
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if(m_fileType == TYPE_FILE)
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{
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painter->drawPath(m_drawPath);
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}
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else if(m_fileType == TYPE_IMAGE)
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{
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painter->drawPicture(0,0,m_picture);
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}
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painter->drawPixmap(m_point.x(),m_point.y(),m_blockPixmap);
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}
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