Layout Options
KIML defines a whole set of standard layout options that many layout algorithms support. Whether an algorithm supports a layout option depends on the option and on the algorithm. Algorithms may provide more specialized documentation for a given layout option.
Contents
Overview
Beside a human-readable name, layout options are defined by the following properties:
- An ID to identify them.
- A type. One of Boolean, String, Int, Float, Enum, EnumSet (a Set over a given enumeration), or Object. The types Enum and EnumSet have to be further defined by an enumeration class. The Object type can be constricted to a certain class.
- An optional definition of what kinds of graph objects the option applies to. At least one of Parents (nodes that have children, including the diagram root node), Nodes, Edges, Ports, and Labels. If this definition is omitted, a layout option will not be shown to the user in the UI, but can still be set programmatically.
- An optional default value. If an option is not set on an object and if the option does not have a default value, null is returned when it is accessed.
KIML defines the following set of layout options:
Option | ID | Type | Applies to | Default |
|---|---|---|---|---|
Alignment | de.cau.cs.kieler.alignment | Enum | Nodes | AUTOMATIC |
Aspect Ratio | de.cau.cs.kieler.aspectRatio | Float | Parents | 0.0 |
Bend Points | de.cau.cs.kieler.bendPoints | Object | Edges |
|
Border Spacing | de.cau.cs.kieler.borderSpacing | Float | Parents | -1.0 |
Comment Box | de.cau.cs.kieler.commentBox | Boolean |
| false |
Debug Mode | de.cau.cs.kieler.debugMode | Boolean | Parents | false |
Diagram Type | de.cau.cs.kieler.diagramType | String |
|
|
Direction | de.cau.cs.kieler.direction | Enum | Parents | UNDEFINED |
Edge Label Placement | de.cau.cs.kieler.edgeLabelPlacement | Enum |
| UNDEFINED |
Edge Routing | de.cau.cs.kieler.edgeRouting | Enum | Parents | UNDEFINED |
Edge Type | de.cau.cs.kieler.edgeType | Enum |
| NONE |
Expand Nodes | de.cau.cs.kieler.expandNodes | Boolean | Parents | false |
Font Name | de.cau.cs.kieler.fontName | String |
|
|
Font Size | de.cau.cs.kieler.fontSize | Int |
|
|
Hypernode | de.cau.cs.kieler.hypernode | Boolean |
| false |
Interactive | de.cau.cs.kieler.interactive | Boolean | Parents | false |
Label Spacing | de.cau.cs.kieler.labelSpacing | Float | Edges | -1.0 |
Layout Hierarchy | de.cau.cs.kieler.layoutHierarchy | Boolean | Parents | false |
Layout Algorithm | de.cau.cs.kieler.algorithm | String | Parents |
|
Minimal Height | de.cau.cs.kieler.minHeight | Float |
| 0.0 |
Minimal Width | de.cau.cs.kieler.minWidth | Float |
| 0.0 |
No Layout | de.cau.cs.kieler.noLayout | Boolean |
| false |
Node Label Placement | de.cau.cs.kieler.nodeLabelPlacement | EnumSet | Nodes |
|
Port Constraints | de.cau.cs.kieler.portConstraints | Enum | Nodes | UNDEFINED |
Port Label Placement | de.cau.cs.kieler.portLabelPlacement | Enum | Nodes | OUTSIDE |
Port Offset | de.cau.cs.kieler.offset | Float |
|
|
Port Side | de.cau.cs.kieler.portSide | Enum |
| UNDEFINED |
Position | de.cau.cs.kieler.position | Object | Labels |
|
Priority | de.cau.cs.kieler.priority | Int | Edges |
|
Randomization Seed | de.cau.cs.kieler.randomSeed | Int | Parents |
|
Separate Connected Components | de.cau.cs.kieler.separateConnComp | Boolean | Parents |
|
Size Constraint | de.cau.cs.kieler.sizeConstraint | EnumSet | Nodes |
|
Size Options | de.cau.cs.kieler.sizeOptions | EnumSet | Nodes | DEFAULT_MINIMUM_SIZE |
Spacing | de.cau.cs.kieler.spacing | Float | Parents | -1.0 |
The Most Important Options
TODO: Write a bit of documentation about the most important layout options and how to use them, possibly with a simple example or something.
Detailed Documentation
This section explains every layout option in more detail.
Port Offset
The port offset is used to specify how much space a layout algorithm should leave between a port and the border of its node. This is usually zero, but doesn't have to be. If the offset is not defined for a given port, a layout algorithm can try to infer the offset from the port's coordinates and its node's size in the input graph. This of course requires both properties to be set to sensible values.