The Tree Layout can be adjusted in the Side Panel (figure 20.13).
Figure 20.13: The tree layout can be adjusted in the Side Panel. The top part of the figure shows a tree with increasing node order. In the bottom part of the figure the tree has been reverted to the original tree topology.
- Layout Selects one of the five layout types: Phylogram, Cladogram, Circular Phylogram, Circular Cladogram or Radial. Note that only the Cladogram layouts are available if all branches in the tree have zero length.
- Phylogram is a rooted tree where the edges have "lengths", usually proportional to the inferred amount of evolutionary change to have occurred along each branch.
- Cladogram is a rooted tree without branch lengths which is useful for visualizing the topology of trees.
- Circular Phylogram is also a phylogram but with the leaves in a circular layout.
- Circular Cladogram is also a cladogram but with the leaves in a circular layout.
- Radial is an unrooted tree that has the same topology and branch lengths as the rooted styles, but lacks any indication of evolutionary direction.
- Ordering The nodes can be ordered after the branch length; either Increasing (shown in figure 20.13) or Decreasing.
- Reset Tree Topology Resets to the default tree topology and node order (see figure 20.13).
- Fixed width on zoom Locks the horizontal size of the tree to the size of the main window. Zoom is therefore only performed on the vertical axis when this option is enabled.
- Show as unrooted tree The tree can be shown with or without a root.