Canvas.h

#ifndef CANVAS_H
#define CANVAS_H

#include <QObject>
#include <QWidget>
#include <QPaintEvent>
#include <QMouseEvent>
#include <QResizeEvent>
#include <QPoint>
#include <QPainterPath>


class Canvas : public QWidget
{
    Q_OBJECT
public:
    explicit Canvas(QWidget *parent = 0);

signals:

public slots:
    void colorBox();
    void backGround();
    void drawRectangle();
    void drawEllipse();
    void drawPoly();
    void drawLine();
    void Save();
private:
    QVector<QPointF> m_points;
    QImage image;
    void UpdateImage();
    QColor color;

//    void drawPolygon();

    QPointF P1;
    QPointF P2;
    QString set="Draw Poly";
    QColor Background=Qt::white;

    QPainterPath path;