QPainter绘制折线，并在折线的两个端点起始位置加上图片

在Qt中，你可以使用`QPainter`和`QPainterPath`来绘制折线，同时通过`setBrush()`设置颜色并在每个端点使用`drawPixmap()`方法添加图片。下面是一个简单的示例：

**头文件（line_image_item.h）:**

#ifndef LINE_IMAGE_ITEM_H
#define LINE_IMAGE_ITEM_H

#include <QObject>
#include <QGraphicsObject>
#include <QPainter>
#include <QPixmap>
#include <QPointF>

class LineImageItem : public QObject, public QGraphicsObject
{
    Q_OBJECT
    Q_PROPERTY(QPointF startPoint READ startPoint WRITE setStartPoint NOTIFY startPointChanged)
    Q_PROPERTY(QPointF endPoint READ endPoint WRITE setEndPoint NOTIFY endPointChanged)

public:
    explicit LineImageItem(QGraphicsScene *parent = nullptr);
    QPointF startPoint() const { return m_startPoint; }
    QPointF endPoint() const { return m_endPoint; }

    void setStartPoint(const QPointF &point) { m_startPoint = point; emit startPointChanged(); }
    void setEndPoint(const QPointF &point) { m_endPoint = point; emit endPointChanged(); }

signals:
    void startPointChanged();
    void endPointChanged();

protected:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override;

private:
    QPointF m_startPoint;
    QPointF m_endPoint;
    QPixmap m_pixmap;  // 图片资源
};

#endif // LINE_IMAGE_ITEM_H

**源文件（line_image_item.cpp）:**

#include "line_image_item.h"

LineImageItem::LineImageItem(QGraphicsScene *parent) : QGraphicsObject(parent), m_pixmap("path_to_your_image.png") {}

//... 其他方法...

void LineImageItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    painter->save();

    // 绘制折线
    QPainterPath path;
    path.moveTo(m_startPoint);
    path.lineTo(m_endPoint);
    painter->drawPath(path);

    // 设置颜色
    painter->setPen(Qt::red);  // 修改这里为所需的线条颜色
    painter->drawPath(path);

    // 在折线两端添加图片
    painter->translate(m_startPoint.x(), m_startPoint.y());
    painter->drawPixmap(0, 0, m_pixmap.scaledToWidth(32));  // 缩放图片并定位
    painter->translate(-m_startPoint.x(), -m_startPoint.y());

    painter->translate(m_endPoint.x(), m_endPoint.y());
    painter->drawPixmap(0, 0, m_pixmap.scaledToWidth(32));
    painter->translate(-m_endPoint.x(), -m_endPoint.y());

    painter->restore();
}

这个`LineImageItem`类包含了折线的起点和终点属性，以及相关的信号通知。在`paint`方法中，我们先创建一个路径，然后绘制折线，再用红色画笔描边。最后在折线的起始和结束位置添加图片。