Qt_GUI_IM_4_8 - 8BitsCoding/RobotMentor GitHub Wiki

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    Ui::Widget *ui;

    // QWidget interface
protected:
    void paintEvent(QPaintEvent *event) override;
};

#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"
#include <QPainter>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::paintEvent(QPaintEvent *event)
{

    QPainter painter(this);

    QPainterPath path;

    path.addRect(100,100,100,100);

    path.moveTo(150,150);

    path.lineTo(150,50);

    path.arcTo(50,50,200,200,90,90);

    path.lineTo(150,150);


    painter.setBrush(Qt::green);
    painter.drawPath(path);


    QPainterPath path2;

    path2.addEllipse(100,220,100,100);
    path2.addEllipse(400,220,100,100);


    //Draw the upper line
    path2.moveTo(150,220);
    path2.lineTo(450,220);


    //Draw the lower line
    path2.moveTo(150,320);
    path2.lineTo(450,320);


    painter.drawPath(path2);


    path2.translate(150,150);

    painter.drawPath(path2);


}