Графика

#include <QtWidgets/QApplication>
#include <QtWidgets/QWidget>
#include <QtGui/QPainter>
#include <QtCore/QDebug>
 
class Widget : public QWidget {
public:
    Widget(QWidget *parent = nullptr) : QWidget(parent) {
        setWindowTitle("QPainter, Qt C++");
        resize(268, 268);
    }
    void paintEvent(QPaintEvent *event) {
        Q_UNUSED(event);
        QPainter qp(this);
        qp.setFont(QFont("serif", 14));
        QRect br = qp.boundingRect(0, 0, 50, 50, 0, "0");
        int hcw = br.width() / 2; // half char width
        int hch = br.height() / 2; // half char height
        // Bars
        qp.setBrush(QBrush(QColor("#6f4fc9"))); // x=1
        qp.drawRect(70, 180, 20, 50);
        qp.setBrush(QBrush(QColor("#d46e16"))); // x=2
        qp.drawRect(120, 80, 20, 150);
        qp.setBrush(QBrush(QColor("#1642d4"))); // x=3
        qp.drawRect(170, 130, 20, 100);
        qp.setBrush(QBrush(QColor("#d41624"))); // x=4
        qp.drawRect(220, 30, 20, 200);
         // X
        qp.drawLine(QPoint(20, 230), QPoint(238, 230));
        qp.drawText(QRect(30 - hcw, 240, 50, 30), 0, "0");
        qp.drawText(QRect(80 - hcw, 240, 50, 30), 0, "1");
        qp.drawLine(QPoint(80, 225), QPoint(80, 235));
        qp.drawText(QRect(130 - hcw, 240, 50, 30), 0, "2");
        qp.drawLine(QPoint(130, 225), QPoint(130, 235));
        qp.drawText(QRect(180 - hcw, 240, 50, 30), 0, "3");
        qp.drawLine(QPoint(180, 225), QPoint(180, 235));
        qp.drawText(QRect(230 - hcw, 240, 50, 30), 0, "4");
        qp.drawLine(QPoint(230, 225), QPoint(230, 235));
        // Y
        qp.drawLine(QPoint(30, 20), QPoint(30, 235));
        qp.drawText(QRect(10, 180 - hch, 50, 30), 0, "1");
        qp.drawLine(QPoint(25, 180), QPoint(35, 180));
        qp.drawText(QRect(10, 130 - hch, 50, 30), 0, "2");
        qp.drawLine(QPoint(25, 130), QPoint(35, 130));
        qp.drawText(QRect(10, 80 - hch, 50, 30), 0, "3");
        qp.drawLine(QPoint(25, 80), QPoint(35, 80));
        qp.drawText(QRect(10, 30 - hch, 50, 30), 0, "4");
        qp.drawLine(QPoint(25, 30), QPoint(35, 30));
    }
};
 
int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}