8096.index.js · part 18

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Node Size Options

Options modifying the behavior of the size constraints set on a node. Each member of the set specifies something that should be taken into account when calculating node sizes. The empty set corresponds to no further modifications.

Node Size Minimum

The minimal size to which a node can be reduced.

Fixed Graph Size

By default, the fixed layout provider will enlarge a graph until it is large enough to contain its children. If this option is set, it won't do so.

Edge Label Placement

Gives a hint on where to put edge labels.

Inline Edge Labels

If true, an edge label is placed directly on its edge. May only apply to center edge labels. This kind of label placement is only advisable if the label's rendering is such that it is not crossed by its edge and thus stays legible.

Font Name

Font name used for a label.

Font Size

Font size used for a label.

Port Anchor Offset

The offset to the port position where connections shall be attached.

Port Index

The index of a port in the fixed order around a node. The order is assumed as clockwise, starting with the leftmost port on the top side. This option must be set if 'Port Constraints' is set to FIXED_ORDER and no specific positions are given for the ports. Additionally, the option 'Port Side' must be defined in this case.

Port Side

The side of a node on which a port is situated. This option must be set if 'Port Constraints' is set to FIXED_SIDE or FIXED_ORDER and no specific positions are given for the ports.

Port Border Offset

The offset of ports on the node border. With a positive offset the port is moved outside of the node, while with a negative offset the port is moved towards the inside. An offset of 0 means that the port is placed directly on the node border, i.e. if the port side is north, the port's south border touches the nodes's north border; if the port side is east, the port's west border touches the nodes's east border; if the port side is south, the port's north border touches the node's south border; if the port side is west, the port's east border touches the node's west border.

Port Label Placement

Decides on a placement method for port labels; if empty, the node label's position is not modified.

Port Labels Next to Port

Use 'portLabels.placement': NEXT_TO_PORT_OF_POSSIBLE.

Treat Port Labels as Group

If this option is true (default), the labels of a port will be treated as a group when it comes to centering them next to their port. If this option is false, only the first label will be centered next to the port, with the others being placed below. This only applies to labels of eastern and western ports and will have no effect if labels are not placed next to their port.

Number of size categories

Defines the number of categories to use for the FIXED_INTEGER_RATIO_BOXES size approximator.

Weight of a node containing children for determining the graph size

When determining the graph size for the size categorisation, this value determines how many times a node containing children is weighted more than a simple node. For example setting this value to four would result in a graph containing a simple node and a hierarchical node to be counted as having a size of five.

Topdown Scale Factor

The scaling factor to be applied to the nodes laid out within the node in recursive topdown layout. The difference to 'Scale Factor' is that the node itself is not scaled. This value has to be set on hierarchical nodes.

Topdown Size Approximator

The size approximator to be used to set sizes of hierarchical nodes during topdown layout. The default value is null, which results in nodes keeping whatever size is defined for them e.g. through parent parallel node or by manually setting the size.

Topdown Hierarchical Node Width

The fixed size of a hierarchical node when using topdown layout. If this value is set on a parallel node it applies to its children, when set on a hierarchical node it applies to the node itself.

Topdown Hierarchical Node Aspect Ratio

The fixed aspect ratio of a hierarchical node when using topdown layout. Default is 1/sqrt(2). If this value is set on a parallel node it applies to its children, when set on a hierarchical node it applies to the node itself.

Topdown Node Type

The different node types used for topdown layout. If the node type is set to {@link TopdownNodeTypes.PARALLEL_NODE} the algorithm must be set to a {@link TopdownLayoutProvider} such as {@link TopdownPacking}. The {@link nodeSize.fixedGraphSize} option is technically only required for hierarchical nodes.

Topdown Scale Cap

Determines the upper limit for the topdown scale factor. The default value is 1.0 which ensures that nested children never end up appearing larger than their parents in terms of unit sizes such as the font size. If the limit is larger, nodes will fully utilize the available space, but it is counteriniuitive for inner nodes to have a larger scale than outer nodes.

Activate Inside Self Loops

Whether this node allows to route self loops inside of it instead of around it. If set to true, this will make the node a compound node if it isn't already, and will require the layout algorithm to support compound nodes with hierarchical ports.

Inside Self Loop

Whether a self loop should be routed inside a node instead of around that node.

Edge Thickness

The thickness of an edge. This is a hint on the line width used to draw an edge, possibly requiring more space to be reserved for it.

Edge Type

The type of an edge. This is usually used for UML class diagrams, where associations must be handled differently from generalizations.

The layer-based method was introduced by Sugiyama, Tagawa and Toda in 1981. It emphasizes the direction of edges by pointing as many edges as possible into the same direction. The nodes are arranged in layers, which are sometimes called "hierarchies", and then reordered such that the number of edge crossings is minimized. Afterwards, concrete coordinates are computed for the nodes and edge bend points.

Orthogonal methods that follow the "topology-shape-metrics" approach by Batini, Nardelli and Tamassia '86. The first phase determines the topology of the drawing by applying a planarization technique, which results in a planar representation of the graph. The orthogonal shape is computed in the second phase, which aims at minimizing the number of edge bends, and is called orthogonalization. The third phase leads to concrete coordinates for nodes and edge bend points by applying a compaction method, thus defining the metrics.

Layout algorithms that follow physical analogies by simulating a system of attractive and repulsive forces. The first successful method of this kind was proposed by Eades in 1984.

Circular layout algorithms emphasize cycles or biconnected components of a graph by arranging them in circles. This is useful if a drawing is desired where such components are clearly grouped, or where cycles are shown as prominent OPTIONS of the graph.

Specialized layout methods for trees, i.e. acyclic graphs. The regular structure of graphs that have no undirected cycles can be emphasized using an algorithm of this type.

Algorithms that require a planar or upward planar graph. Most of these algorithms are theoretically interesting, but not practically usable.

Radial layout algorithms usually position the nodes of the graph on concentric circles.

Fixed Layout