Graphics without qwt

I want do a graphic that plot some bars or rects into two axys, x and y.

I can not use qwt due to I have to do everything step by step.

Does anyone can help me?

Have a look at QGraphicsView and QGraphicsScene. Using QGraphicsRectItem you should be able to draw a bar plot with a few lines of code...

...or if the drawings are simple, just use a QWidget and do custom painting in QWidget::paintEvent()

I have get the lines, but how can I do the axes?i have tryed doing with drawLine() but they don't see.The code of the lines is the following one:

Code:

---

Brush::Brush(QWidget *parent)
    : QWidget(parent)
{
 
}
 
void Brush::paintEvent(QPaintEvent *event)
{
  QPainter painter(this);
  painter.setPen(Qt::NoPen);
 
  QPen pen(Qt::black,2);
  painter.drawLine(100, 100, 75, 225);
  painter.setBrush(Qt::VerPattern);
  painter.drawRect(100, 100, 600,200);
 
 
}

---

You have NoPen setting.. change to:

Code:

---

void Brush::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
 
QPen pen = painter.pen();
pen.setColor( Qt::black );
 
painter.setPen( pen );
 
painter.drawLine(100, 100, 75, 225);
painter.setBrush(Qt::VerPattern);
painter.drawRect(100, 100, 600,200);
 
 
}

---

I have done as you tell me but the shape that it is drawn is not what I need.
I need to paint the "axe t" and the "axe y" that I have added to the picture.
how can I do the axes?

what I am doing wrong?

I'm trying with QGraphicsLineItem but i don't get it!:confused:

My new code is:

Brush::Brush(QWidget *parent)
: QWidget(parent)
{

}

void Brush::paintEvent(QPaintEvent *event)
{
QGraphicsScene *scene1 = new QGraphicsScene(this);
int x1, y1, x2, y2, t;
x1 = 0; y1=0; x2=100; y2=2, t=0;

QPainter painter(this);
painter.setPen(Qt::NoPen);

QPen pen(Qt::black,2);
painter.drawLine(100, 100, 75, 225);
painter.setBrush(Qt::VerPattern);
painter.drawRect(100, 100, 600,200);


QGraphicsLineItem *line = new QGraphicsLineItem( QLineF( x1,y1, x2, y2 ) );
scene1->addItem(line);