QArrow.h

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#pragma once
 
#include <QGraphicsItem>
#include <QPen>
 
const double PI = 3.14159265;
 
class QArrow : public QGraphicsItem
{
public:
    QArrow(qreal l, qreal a, qreal hl, qreal hw, QPen& pen,
           QGraphicsItem* parent = nullptr);
    QArrow(qreal l, qreal a, QPen& pen, QGraphicsItem* parent = nullptr);
    ~QArrow() override;
 
    double getLength();
    double getAngle();
    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option,
               QWidget* widget) override;
    QRectF boundingRect() const override;
    void setAngle(qreal a);
    void setLength(qreal l);
 
private:
    double calcCos(double angle);
    double calcSin(double angle);
 
    qreal _arrowLength;
    qreal _arrowAngle;
    qreal _headLength;
    qreal _headWidth;
    QPen _arrowPen;
};