Is Update() the right way?

[td]

Hi all,

I have a program in which two widgets are connected together. One widget displays an image and upon a mouse event (press) it passes the co-ordinates (in the form of a QPoint) to the other widget. My hope is that this Widget then displays a cropped version of the other image.

I have so far been unsuccessful in this. My main problem is updating the cropped-image display widget. Currently it shows nothing (the signals and slots are working by the way).

Here is the code

MyWidgetOne::MyWidgetOne(QWidget* parent): QWidget(parent)
{
  int x, y;
 
  coordOne = new QPoint;
 
  drawLabel = new QLabel;
  QPixmap dl;
  dl.load("resources/image_ori.bmp");
  dl = dl.copy(x-25, y-25, 50, 50);
  dl.save("resources/image.bmp");
  drawLabel->setPixmap(dl);
 
 
  QVBoxLayout* mainLayout = new QVBoxLayout;
  mainLayout->addWidget(drawLabel);
 
  setLayout(mainLayout);
  setWindowTitle(tr("Receiver"));
}
 
void MyWidgetOne::showCoords(QPoint xy)
{
	int i, j;
	coordOne = &xy;
	i = (coordOne->x());
	j = coordOne->y();
	x = i;
	y = j;
	update();
	//repaint();
}

MyWidgetOne::MyWidgetOne(QWidget* parent): QWidget(parent)
{
  int x, y;

  coordOne = new QPoint;

  drawLabel = new QLabel;
  QPixmap dl;
  dl.load("resources/image_ori.bmp");
  dl = dl.copy(x-25, y-25, 50, 50);
  dl.save("resources/image.bmp");
  drawLabel->setPixmap(dl);


  QVBoxLayout* mainLayout = new QVBoxLayout;
  mainLayout->addWidget(drawLabel);
  
  setLayout(mainLayout);
  setWindowTitle(tr("Receiver"));
}

void MyWidgetOne::showCoords(QPoint xy)
{
	int i, j;
	coordOne = &xy;
	i = (coordOne->x());
	j = coordOne->y();
	x = i;
	y = j;
	update();
	//repaint();
}

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So as you can see I use x and y to define the corner of the area to be displayed (with a 50 height and width). When I receive the QPoint, I update this values via i and j).

I thought putting update() or repaint() would work but they have so far been of no use. Any help would be appreciated.

[td]

Hey,

Managed to get it working.

void MyWidgetOne::paintEvent(QPaintEvent *event)
{
	QPixmap dm;
  dm.load("resources/image_ori.bmp");
  dm = dm.copy(x-25, y-25, 50, 50);
  dm.save("resources/image.bmp");
  drawLabel->setPixmap(dm);
 
}

void MyWidgetOne::paintEvent(QPaintEvent *event)
{
	QPixmap dm;
  dm.load("resources/image_ori.bmp");
  dm = dm.copy(x-25, y-25, 50, 50);
  dm.save("resources/image.bmp");
  drawLabel->setPixmap(dm);

}

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Forgot to include the above I suppose just writing down the problem reminded me of what was missing!