I cannot draw a simple line in qt

Question

I'm trying to drawing a simple line using a dialog but when I compile my code nothing happens, I have the dialog without nothing, please any body could explain me what is happening? Below my code:

#include "dialog.h"
#include "ui_dialog.h"
#include <QPainter>

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

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

void Dialog::paintEvent(QPainter *)
{
    QPainter painter(this);
    painter.drawLine(10,10,100,100);
}

I don't know what is wrong

If you are using C++11 you should use an `override` keyword to prevent such errors. — Dmitry Sazonov, Nov 12 '15 at 08:28

score 3 · Answer 1 · answered Nov 12 '15 at 03:16

3

This line is wrong:

void Dialog::paintEvent(QPainter *)

It has the wrong arguments-signature, so it is not getting called. It should instead be:

void Dialog::paintEvent(QPaintEvent *)

answered Nov 12 '15 at 03:16

Jeremy Friesner

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I cannot draw a simple line in qt

1 Answers1