How to manually set the zoom on a Jung visualisation?

Question

I have a jung tree displayed in a JPanel. The constructor of my tree looks like this:

  Forest graph = new DelegateForest

        

Answer 1

ScalingControl is not good method if you use Mouse Transformer.

Try to:

// for zoom:
vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT).setScale(scale_x1, scale_y1, vv.getCenter());
// for out:
vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW).setScale(scale_x2, scale_y2, vv.getCenter());