Can't display my graphics in a JPanel

[handro1104]

I have a problem displaying in a JPanel figures that I create with java.awt.Graphics. I want to display a work flow tree that I create in a dialog (the display panel is in a different dialog). I have a button in the dialog that creates the tree to open the display dialog, which contains the display panel in a scroll pane.

private void jDisplayButtonActionPerformed(java.awt.event.ActionEvent evt) {
		workFlowDialog = new WorkFlowDialog(this, steps);
		workFlowDialog.setVisible(true);
	}

I am passing a list of the work flow steps. The constructor of the display dialog is

	public WorkFlowDialog(JDialog parent,
			ArrayList<ProcessingStep> processingSteps) {
		super(parent, true);
		initComponents();
		constructGraph(processingSteps);
		workFlowPanel.setNodesList(nodesList);
	}

The method constructGraph constructs a list of GraphNode, nodesList; this is what I set in the display pane with "javaworkFlowPanel.setNodesList(nodesList);".
The display panel, workFlowPanel, extends JPanel and overrides the method paintComponent.

	public void paintComponent(Graphics graphics) {
		super.paintComponent(graphics);
		graphics.setColor(new Color(153, 255, 255));
		for (GraphNode nextGraphNode : nodesList) {
			int x = nextGraphNode.i * WorkFlowDialog.SEPARATION + WorkFlowDialog.DIAMETER / 2;
			int y = nextGraphNode.j * WorkFlowDialog.SEPARATION + WorkFlowDialog.DIAMETER / 2;
			graphics.drawOval(x, y, WorkFlowDialog.DIAMETER, WorkFlowDialog.DIAMETER);
			graphics.fillOval(x, y, WorkFlowDialog.DIAMETER, WorkFlowDialog.DIAMETER);
			graphics.drawString("X",x, y);
		}
	}

When the constructor of WorkFlowDialog completes the dialog is displayed and it is using my paintComponent method (I can single step through it). However nothing is displayed.
I am perplexed; I have used code like this in the past and it worked. If the repaint method is executing "graphics.drawOval(x, y, WorkFlowDialog.DIAMETER, WorkFlowDialog.DIAMETER);" why the window doesn't show anything?

Your help will be greatly appreciated,

Alejandro barrero

[doWhile]

Add some println's to the paint component (or use a debugger) to make sure the values used in your painting method are values which paint where you would expect.

[handro1104]

Thank you doWhile. You are absolutely correct; I was painting at negative positions. How do I set a thread to SOLVED in this forum?