#ifndef __MOUSELINE_H__
#define __MOUSELINE_H__
#include <QWidget>
#include <QVector>
#include <QPoint>
#include <QPainter>
#include <QBrush>
#include <QPen>
#include <QPaintEvent>

class MouseLine: public QWidget {
    public:
        MouseLine(QWidget* p = 0): QWidget(p)
        {

        }
    private:
        QVector<QPoint>        m_points;

    protected:
        void paintEvent(QPaintEvent* ev)
        {
            if(m_points.isEmpty()) QWidget::paintEvent(ev);
            else if(m_points.size() > 1){
                QPainter painter(this);
                painter.setPen(Qt::red);
                QVectorIterator<QPoint> iter(m_points);
                QPoint begin,end;
                end  = iter.next();
                while(iter.hasNext()){
                    begin = end;
                    end = iter.next();
                    painter.drawLine(begin,end);
                }
//                painter.drawLines(m_points);
//                painter.drawLines(m_points.data() + 1, m_points.size()/2 - 1);
            }
        }
        void mousePressEvent(QMouseEvent* ev)
        {
            Qt::MouseButton button = ev->button();
            const QPoint& point = ev->pos();
            if(button == Qt::LeftButton) m_points.append(point);
            else if(button == Qt::RightButton) m_points.clear();
            update();
        }
        void mouseMoveEvent(QMouseEvent* ev)
        {
            m_points.last() = ev->pos();
            update();
        }

};


#endif