line.h

#ifndef LINE_H
#define LINE_H

#include <QWidget>
#include <QPainter>

class Line : public QWidget
{
    Q_OBJECT
public:

    explicit Line(QWidget *parent = 0);

    Line(int fromX, int fromY, int toX, int toY, int w, QColor c, QWidget *parent = 0);

    Line(int fromX, int fromY, int length, double angle, int w, QColor c, QWidget *parent = 0);

    void setCoords(int fromX, int fromY, int toX, int toY);

    void setpenColor(QColor c);

    void setPenWidth(int w);

    int getX0();

    int getY0();

    int getX1();

    int getY1();

signals:

public slots:

protected:
    void paintEvent(QPaintEvent *);

private:
    int x0, 
    y0,     
    x1,     
    y1;     
    int penWidth; 
    QColor penColor; 
};

#endif // LINE_H