Hierarchical - Radial Tree layout algorithm properties

When the Hierarchical - Radial Tree schematic layout algorithm is chosen from the Layout Task drop-down list, clicking the Layout Algorithm Properties button Layout Algorithm Properties icon on the Schematic Editor toolbar opens its associated properties dialog box as follows:

Hierarchical - Radial Tree properties dialog box

The parameter values are those either specified by default by ArcGIS Schematics or specifically set as default for the schematic diagram template related to the active diagram using the Schematic Dataset Editor Layout Task tab for this schematic diagram template.

About root schematic node

The Hierarchical - Radial Tree algorithm works from a root schematic node that is used as the circle center to arrange the subtrees starting from this root around concentric circles, each circle corresponding to one hierarchical level.

This root node can be specified using the Set Schematic Root tool Set Schematic Root icon. If no root node is set, the algorithm automatically considers one of the schematic nodes as the root node.

Initial radius parameter

The Initial radius parameter determines the radius of the first concentric circle whose center is the radial tree root node. This will be the radius of the circle around which the schematic nodes belonging to the first hierarchical level are placed. The initial radius unit depends on the Absolute units check box.

The figures below show the Initial radius parameter. The value for the radius factor is set to 1 in the examples:

Radial Tree - Initial Radius

Radius factor parameter

The Radius factor parameter represents the multiplicative factor used to increase or decrease the radius of each concentric circle. By default, the radius factor value is 1 (unless another default factor is specified for the diagram template related to the active diagram). The initial radius also represents the distance that separates each concentric circle related to a hierarchical level. When using a radius factor less than 1, the distance that separates the schematic nodes belonging to the (n) hierarchical level and the (n+1) hierarchical level progressively decreases. With a factor greater than 1, the distance between the hierarchical levels increases progressively.

The figures below show the radius factor impact for a fixed value of the Initial radius parameter (Initial radius = 4) while the Absolute units check box is unchecked:

Radial Tree - Radius factor

Absolute units check box

By default, the Initial radius parameter value is interpreted as absolute units determined by the coordinate system specified on the XY Coordinate System tab of the Schematic Diagram Properties dialog box (Absolute units checked). Uncheck the Absolute units check box if you want this parameter value to be interpreted as relative units to the average of the current symbol sizes used to represent the schematic nodes in the diagram. In this case, when the Initial radius parameter value is 2, the radius of the first concentric circle centered on the root node corresponds to the average size of two symbols placed side by side.

HinweisHinweis:

Specifying parameters in relative units is easier than in absolute units but has real meaning only when there is a reference scale for the diagram.

Restore Defaults button

Click the Restore Defaults button to reset all the Hierarchical - Radial Tree layout algorithm parameters to their default values. The restored values are those either specified by default by Schematics or specifically set as default for the schematic diagram template related to the active diagram using the Schematic Dataset Editor Layout Task tab for this schematic diagram template.

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7/10/2012