Tree

JGo
1

Hi,

I am trying to implement a left to right tree (single root node) with JGoTextNode and JGoLabeledLinks. I want the graph view to have a fixed width and height. The tree needs to dynamically shrink the size of the nodes to fit the fixed size of the view. It works fine with a certain node size. However, when I reduce the node size, the tree graph is not rendered properly. Do you have any suggestions?
Thanks!
2

The easiest thing is to create the diagram and then rescale the view so that it fits. Call GoView.RescaleToFit.

3

Hi Walter,

I did not see rescaleToFit API in JGoView. Where is this rescaleToFit API?
thanks!
4
Sorry, I didn't recognize you were talking about JGo. I have moved this topic from the GoDiagram forum to this forum.
You're right -- that method isn't defined on JGoView. Here's one definition:
public void rescaleToFit() {
Dimension dispSize = getCanvas().getSize();
Rectangle docbounds = getDocument().computeBounds();
double newscale = 1;
if (docbounds.width > 0 && docbounds.height > 0)
newscale = Math.min((dispSize.width / (double)docbounds.width), (dispSize.height / (double)docbounds.height));
if (newscale > 1)
newscale = 1;
setScale(newscale);
setViewPosition(docbounds.x, docbounds.y);
}
This need not be a method on JGoView of course. You can easily parameterize it to take a JGoView as an argument.
5

I have a JPanel panelA which contains a JGoView. I have another JPanel

panelB which will contain panelA. I am trying to have the JGoView
canvas color the same as the background color of panelB. I made panelA
and JGoView opaque but I still see the white color on the JGoView canvas.
Any suggestions?
Thanks!
6

If you called JGoView.setBackground and that didn’t have any effect, is that because you had set JGoDocument.setPaperColor to be non-null?

7

Actually, what I want is JGoView to be opaque. This way, the canvas/view color will be the same as the background of its container. How do I do this? I tried setting setOpaque(true) on the JGoView but I still see a white

color on the canvas. Any suggestions?
8

JGoView is always opaque. Did you try calling JGoView.setBackground or JGoDocument.setPaperColor?