Coding new link

JGo
1

in the Demo1View.java,instead of insertPointIntoLink(),I want to insert a JGOBasicNode at the point and relink them.the code is below but it dosn’t work,and the new inserted JGOBasicNode can’t be moved.

void insertBasicNodeintoLink()
{
if (getSelection().getPrimarySelection() instanceof JGoLink) {
JGoLink s = (JGoLink)getSelection().getPrimarySelection();
int i = s.getSegmentNearPoint(myMouseUpDocPoint);
if (s.getNumPoints() > 3) {
if (i < 1)
i = 1; // don't add to first segment
else if (i >= s.getNumPoints()-2)
i = s.getNumPoints()-3; // don't add to last segment
}
Point a = s.getPoint(i);
Point b = s.getPoint(i+1);
Point closest = new Point((a.x+b.x)/2, (a.y+b.y)/2);
getDocument().startTransaction();
JGoBasicNode bnode = new JGoBasicNode("3");

JGoRectangle rect = new JGoRectangle();
rect.setSize(20, 20);
bnode.setDrawable(rect);
bnode.setLocation(closest);
bnode.setBrush(JGoBrush.makeStockBrush(JGoBrush.ColorOrange));
bnode.setLabelSpot(JGoObject.Center);
bnode.setDraggable(true);
getDocument().getFirstLayer().addObjectAtTail(bnode);
JGoLabeledLink newlink=new JGoLabeledLink(bnode.getPort(),s.getToPort());
s.setToPort(bnode.getPort());
getDocument().getLinksLayer().addObjectAtTail(newlink);
s.insertPoint(i+1, closest);
//if (s.isOrthogonal()) // when orthogonal, gotta insert two points
//s.insertPoint(i+1, closest);
//getSelection().toggleSelection(s);
//selectObject(s);
getDocument().endTransaction("inserted node into link stroke");
}
}
2

The only problem with your code is that you are adding the new node into the first layer in the document (the background layer) and the constructor for the Demo1 class calls myBackgroundLayer.setModifiable(false), so nothing in that layer can be moved.
So if you change your line from:

getDocument().getFirstLayer().addObjectAtTail(bnode);
to
getDocument().addObjectAtTail(bnode);
Everything should work.