TreePlot lays out the vertices of a graph in a tree of successive layers, or a collection of trees. If the graph g is not a tree, TreePlot lays out its vertices on the basis of a spanning tree of each component of the graph.

By default, TreePlot places each tree root at the top. TreePlot[g,pos] places the roots at position pos. Possible positions are: Top, Bottom, Left, Right, and Center.

In addition to options for Graphics, the following options are accepted for LayeredGraphPlot.

The option DirectedEdges specifies whether to draw edges as directed arrows. Possible values for this option are True or False. The default value for this option is False.

The option EdgeLabels specifies whether and how to display labels given for the edges. Possible values for this option are All, None, or Automatic. The default value for this option is Automatic, which displays the supplied edge labels on the graph.

The option EdgeShapeFunction specifies graphical representation of the graph edges. Possible values for this option are Automatic, None, or a function that gives a proper combination of graphics primitives and directives. With the default setting of Automatic, a line is drawn for each edge. With EdgeShapeFunction->None, edges are not drawn.

With EdgeShapeFunction->g, each edge is rendered with the graphics primitives and directives given by the function g that can take three or more arguments, in the form g[{r_i,…,r_j},{v_i,v_j},lbl_ij,…], where r_i,r_j are the coordinates of the beginning and ending points of the edge, v_i,v_j are the beginning and ending vertices, and lbl_ij is any label specified for the edge or None. Explicit settings for EdgeShapeFunction->g override settings for EdgeLabels and DirectedEdges.

The LayerSizeFunction option specifies the relative height to allow for each layer. By default the height is 1. Possible values include a function that gives real machine numbers.

The option MultiedgeStyle specifies whether to draw multiple edges between two vertices. Possible values for MultiedgeStyle are Automatic (the default), True, False, or a positive real number. With the default setting MultiedgeStyle->Automatic, multiple edges are shown for a graph specified by a list of rules, but not shown if specified by an adjacency matrix. With MultiedgeStyle->δ, the multiedges are spread out to a scaled distance of δ.

The option "PackingLayout" specifies the method used for packing disconnected components. Possible values for the option are Automatic (the default), "ClosestPacking", "ClosestPackingCenter", "Layered", "LayeredLeft", "LayeredTop", and "NestedGrid". With "PackingLayout"->"ClosestPacking", components are packed as close together as possible using a polyomino method, starting from the top left. With "PackingLayout"->"ClosestPackingCenter", components are packed starting from the center. With "PackingLayout"->"Layered", components are packed in layers starting from the top left. With "PackingLayout"->"LayeredLeft" or "PackingLayout"->"LayeredTop", components are packed in layers starting from the top or left respectively. With "PackingLayout"->"NestedGrid", components are arranged in a nested grid. The typical effective default setting is "PackingLayout"->"Layered", and the packing starts with components of the largest bounding box area.

PlotRangePadding is a common option for graphics functions inherited by TreePlot.

PlotStyle is a common option for graphics functions inherited by TreePlot. The option PlotStyle specifies the style in which objects are drawn.

The option SelfLoopStyle specifies whether and how to draw loops for vertices that are linked to themselves. Possible values for the option are Automatic (the default), True, False, or a positive real number. With SelfLoopStyle->Automatic, self-loops are shown if the graph is specified by a list of rules, but not if it is specified by an adjacency matrix. With SelfLoopStyle->δ, the self-loops are drawn with a diameter of δ (relative to the average edge length).

The option VertexCoordinates specifies the coordinates of the vertices. Possible values are None or a list of coordinates. Coordinates specified by a list of rules are not supported by TreePlot currently.

The option VertexLabels specifies whether to show vertex names as labels. Possible values for this option are All, None and Automatic (the default). VertexLabels->All shows the labels. For graphs specified by an adjacency matrix, vertex labels are taken to be successive integers , where is the size of the matrix. For graphs specified by a list of rules, labels are the expressions used in the rules. VertexLabels->None displays each vertex as a point. You can also use Tooltip[v_k,v_lbl] anywhere in the list of rules to specify an alternative tooltip for a vertex v_k.

The option VertexShapeFunction specifies graphical representation of the graph edges. Possible values for this option are Automatic, None, or a function that gives a proper combination of graphics primitives and directives. With the default setting of Automatic, vertices are displayed as points.

With VertexShapeFunction->g, each vertex is rendered with the graphics primitives given by g[r_i,v_i,…], where r_i is the coordinate of the vertex and v_i is the label of the vertex. Explicit settings for VertexShapeFunction->g override settings for VertexLabels.