Error while redrawing using QPainter Class

[sosanjay]

Hi All,

I am using QPainter class to draw line on the button event.
I am using three push button on which every button different layouts of the line will draw.

First time it works well but when I press rapidly few times then overwriting will occur.
I am using painter.eraseRect(0,0,281,191); but it not works

Can anyone help me to clear the label everytime when I draw.
In Qt there is no painter.clear() properties.

How can I clear the screen every time before I draw.

In 1st Push button I write 
 
               QPixmap pix(281,191);
                QPen Pen((QColor::QColor (255,255,255,255)),2);
 
                QLineF line1(0,50,281,50);          
                painter.eraseRect(0,0,281,191);
                painter.begin(&pix);
                painter.setPen(Pen);             
                painter.drawLine(line1);
                painter.end();
 
In 2nd button I write
 
               QPixmap pix(281,191);
               QPen Pen((QColor::QColor (255,255,255,255)),2);                
                QLineF line1(60,50,281,50);
                QLineF line2(60,141,281,141);
                QLineF line3(60,0,60,191);
                painter.eraseRect(0,0,281,191);
                painter.begin(&pix);
                painter.setPen(Pen);              
                 painter.drawLine(line1);
                painter.drawLine(line2);
                 painter.drawLine(line3);
                painter.end();
 
so on..

In 1st Push button I write 

               QPixmap pix(281,191);
                QPen Pen((QColor::QColor (255,255,255,255)),2);

                QLineF line1(0,50,281,50);          
                painter.eraseRect(0,0,281,191);
                painter.begin(&pix);
                painter.setPen(Pen);             
                painter.drawLine(line1);
                painter.end();

In 2nd button I write

               QPixmap pix(281,191);
               QPen Pen((QColor::QColor (255,255,255,255)),2);                
                QLineF line1(60,50,281,50);
                QLineF line2(60,141,281,141);
                QLineF line3(60,0,60,191);
                painter.eraseRect(0,0,281,191);
                painter.begin(&pix);
                painter.setPen(Pen);              
                 painter.drawLine(line1);
                painter.drawLine(line2);
                 painter.drawLine(line3);
                painter.end();

so on..

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