[1] How can I change the fillOpacity for the leafnodes that has the same parent based on the scale of their values? e.g. for the node "heap", it has two children "heapNode" and "FibonacciHeap". set the fillOpacify based on the two heap nodes's value. [2] How can I assign a specific color to a selected node and all its childrens? e.g. I want to assign red to the node "heap" and its all children. Thanks!