QGraphics view problem

[kiranraj]

1.GraphicsLine is derived from QGraphicsItem class and ItemColor (Stores the color of the line)
2. GraphicsRect is derived from QGraphicsRectItem.

Bounding rectangle of GraphicsLine is shown below.

QRectF GraphicsLine:: boundingRect () const
{   
     QPolygon p(4);
     //Q3PointArray p(poly);
     int xi = int(x());
     int yi = int(y());
     int pw = 1;//pen().width();
     int dx = (x1-x2);
     if( dx<0)
       dx= -dx;  
\\     int dy = y1-y2;
     if(dy<0)
       dy=-dy;  
     pw = pw*4/3+2; // approx pw*sqrt(2)
     int px = x1<x2 ? -pw : pw ;
     int py = y1<y2 ? -pw : pw ;
     if ( dx && dy && (dx > dy ? (dx*2/dy <= 2) : (dy*2/dx <= 2)) ) {
     // steep
    if ( px == py ) {
         p[0] = QPoint(x1+xi   ,y1+yi+py);
         p[1] = QPoint(x2+xi-px,y2+yi   );
         p[2] = QPoint(x2+xi   ,y2+yi-py);
         p[3] = QPoint(x1+xi+px,y1+yi   );
     } else {
         p[0] = QPoint(x1+xi+px,y1+yi   );
         p[1] = QPoint(x2+xi   ,y2+yi-py);
         p[2] = QPoint(x2+xi-px,y2+yi   );
         p[3] = QPoint(x1+xi   ,y1+yi+py);
     }
     } else if ( dx > dy ) {
     // horizontal
     p[0] = QPoint(x1+xi+px,y1+yi+py);
     p[1] = QPoint(x2+xi-px,y2+yi+py);
     p[2] = QPoint(x2+xi-px,y2+yi-py);
     p[3] = QPoint(x1+xi+px,y1+yi-py);
     } else {
     // vertical
     p[0] = QPoint(x1+xi+px,y1+yi+py);
     p[1] = QPoint(x2+xi+px,y2+yi-py);
     p[2] = QPoint(x2+xi-px,y2+yi-py);
     p[3] = QPoint(x1+xi-px,y1+yi+py);
     }
     return p.boundingRect();

QRectF GraphicsLine:: boundingRect () const
{   
     QPolygon p(4);
     //Q3PointArray p(poly);
     int xi = int(x());
     int yi = int(y());
     int pw = 1;//pen().width();
     int dx = (x1-x2);
     if( dx<0)
       dx= -dx;  
\\     int dy = y1-y2;
     if(dy<0)
       dy=-dy;  
     pw = pw*4/3+2; // approx pw*sqrt(2)
     int px = x1<x2 ? -pw : pw ;
     int py = y1<y2 ? -pw : pw ;
     if ( dx && dy && (dx > dy ? (dx*2/dy <= 2) : (dy*2/dx <= 2)) ) {
     // steep
    if ( px == py ) {
         p[0] = QPoint(x1+xi   ,y1+yi+py);
         p[1] = QPoint(x2+xi-px,y2+yi   );
         p[2] = QPoint(x2+xi   ,y2+yi-py);
         p[3] = QPoint(x1+xi+px,y1+yi   );
     } else {
         p[0] = QPoint(x1+xi+px,y1+yi   );
         p[1] = QPoint(x2+xi   ,y2+yi-py);
         p[2] = QPoint(x2+xi-px,y2+yi   );
         p[3] = QPoint(x1+xi   ,y1+yi+py);
     }
     } else if ( dx > dy ) {
     // horizontal
     p[0] = QPoint(x1+xi+px,y1+yi+py);
     p[1] = QPoint(x2+xi-px,y2+yi+py);
     p[2] = QPoint(x2+xi-px,y2+yi-py);
     p[3] = QPoint(x1+xi+px,y1+yi-py);
     } else {
     // vertical
     p[0] = QPoint(x1+xi+px,y1+yi+py);
     p[1] = QPoint(x2+xi+px,y2+yi-py);
     p[2] = QPoint(x2+xi-px,y2+yi-py);
     p[3] = QPoint(x1+xi-px,y1+yi+py);
     }
     return p.boundingRect();

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Thanks.