The baloon tree layout tries to compact the drawing area of the tree by placing the vertices in balloons around the tree root. It produces straight line tree drawings.

Following is a brief description of its properties:

• ParentChildSpacing - the preferred spacing between a parent and a child vertex in the layout direction. The real spacing may be different for some nodes, because the layout does not allow overlappings.
• VertexSpacing - the minimal spacing between 2 nodes in the layout. If set to 0, the nodes will touch each other.
• ChildWedge - the sector angle (measured in degrees) for the children of each vertex.
• RootWedge - the sector angle (measured in degrees) for the children of the root vertex.
• StartAngle - the start angle for the children of the root vertex, measured in degrees anticlockwise from the x-axis.