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maider
17th June 2009, 15:37
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?

shentian
17th June 2009, 16:11
Have a look at QGraphicsView and QGraphicsScene. Using QGraphicsRectItem you should be able to draw a bar plot with a few lines of code...

Lykurg
17th June 2009, 16:27
...or if the drawings are simple, just use a QWidget and do custom painting in QWidget::paintEvent()

maider
19th June 2009, 15:44
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:

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);


}

lni
19th June 2009, 17:57
You have NoPen setting.. change to:



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);


}

maider
22nd June 2009, 08:22
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?

maider
22nd June 2009, 11:22
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);