keyevent/zoom

[bhogasena]

hi,
i have written code in keypressevent like below

void GLWidget::KeyPressEvent(QKeyEvent *event) 
{
	switch(event->key())
	{
	case Qt::Key_Home : 
 
			sBoundingBox.fMinX=-180;
			sBoundingBox.fMinY=-90;
			sBoundingBox.fMaxX=+180;
			sBoundingBox.fMaxY=+90;
 
				 break;
	case Qt::Key_Plus : 
 
			sBoundingBox.fMinX += 1000.0;
			sBoundingBox.fMaxX -= 1000.0;
			sBoundingBox.fMinY += 1000.0;
			sBoundingBox.fMaxY -= 1000.0;
 
				break;
	case Qt::Key_Minus : 
			sBoundingBox.fMinX -= 1000.0;
			sBoundingBox.fMaxX += 1000.0;
			sBoundingBox.fMinY -= 1000.0;
			sBoundingBox.fMaxY += 1000.0;
 
				break;
	}
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity ();
 
	glOrtho(sBoundingBox.fMinX, sBoundingBox.fMaxX,sBoundingBox.fMinY,sBoundingBox.fMaxY,-1,1);
	glMatrixMode(GL_MODELVIEW);
	//glIdleFunc(paintGL);
	paintGL();
}

void GLWidget::KeyPressEvent(QKeyEvent *event) 
{
	switch(event->key())
	{
	case Qt::Key_Home : 
			
			sBoundingBox.fMinX=-180;
			sBoundingBox.fMinY=-90;
			sBoundingBox.fMaxX=+180;
			sBoundingBox.fMaxY=+90;
				 
				 break;
	case Qt::Key_Plus : 
	
			sBoundingBox.fMinX += 1000.0;
			sBoundingBox.fMaxX -= 1000.0;
			sBoundingBox.fMinY += 1000.0;
			sBoundingBox.fMaxY -= 1000.0;
		
				break;
	case Qt::Key_Minus : 
			sBoundingBox.fMinX -= 1000.0;
			sBoundingBox.fMaxX += 1000.0;
			sBoundingBox.fMinY -= 1000.0;
			sBoundingBox.fMaxY += 1000.0;
							 
				break;
	}
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity ();
	
	glOrtho(sBoundingBox.fMinX, sBoundingBox.fMaxX,sBoundingBox.fMinY,sBoundingBox.fMaxY,-1,1);
	glMatrixMode(GL_MODELVIEW);
	//glIdleFunc(paintGL);
	paintGL();
}

To copy to clipboard, switch view to plain text mode 

but program is not enterint at all into this fuction
can anyone help me?
thanks and regards
k. bhogasena reddy