Scaling allows you to specify two aspects of hierarchy layouts: the relative size of child and parent elements, and the number of child levels viewable at each zoom increment.
The following figure shows the Object Inspector displaying the default properties of the Organization chart layout.
The ChildScaling property specifies the relative size of each child cell to its parent. In the default organization chart, the child cells are scaled at 75% of the size as the parent cells. For an enhanced effect, or to save screen space, you might change the ChildScaling to 50% so that child cells appear much smaller than parent cells.
MinVisibleScaling and MaxVisibleScaling specify the zoom levels at which each child level of the hierarchy is viewable when the scene is run.
If ChildScaling is 100%, all levels of the hierarchy are viewable at a MinVisibleScaling up to 100%, because all levels are the same size and the default zoom level for the scene is 100%.
However, perhaps you want your layout to reveal each child level as the viewer zooms in. You might want the second level of the hierarchy to become viewable only when the end-user zooms in to 200%.
One way to create this effect is to set the ChildScaling to 50% so that each child level becomes viewable when its the zoom level doubles the size of the child element. You must set the MinVisibleScaling to a value greater than the ChildScaling factor of 50% and less than or equal to the default zoom level of 100%.
The default MinVisibleScaling of 75% allows the first and second levels to be viewable between a zoom level of 75% and 100%. Then, the third level becomes viewable when the zoom level is greater than 100%.
By experimenting with these scaling factors, you can achieve a desired affect for viewers zooming in on your data.