Edge Label Placement Demo
This demo shows how to place edge labels at the preferred location with a labeling
algorithm and the PreferredPlacementDescriptor type.
Usage
- To add a new label to a selected edge, press Shift + F2.
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Changes of the label properties are immediately applied to the selected labels, or to
all labels if no label is selected, and a new layout is calculated to visualize the
result of these settings.
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The selected layout is calculated immediately after changing any of the label properties
or if the Refresh Layout button is pressed.
Edge Label Properties
Distance to Edge
The distance between the edge and the closest label corner.
Placement Along Edge
Whether the label should be placed near the source or target node, centered between source
and target or anywhere. Placement at source port or at target port is only supported by
hierarchic layout. In all other cases, it is replaced by at source/at target respectively.
Side of Edge
Whether the label should be placed centered on the edge or on the left or right side.
Side Reference
Determines if 'left' and 'right' of the edge are interpreted relative to the edge
direction or using the absolute position. In the latter case, the side is ambiguous for
horizontal segments, and either the left or the right side can be 'North' of the edge.
Angle (In Degrees)
The rotation angle (in degrees) of the label.
Angle Reference
Whether the rotation angle is relative to the edge slope or absolute.
Angle Rotation on Right Side
While the angle for labels on the edge and left of the edge is always interpreted
clockwise, the rotation for labels on the right side can either be interpreted clockwise
or counter-clockwise.
Add 180° on Right Side
Whether labels on the right side should be rotated by additional 180 degrees.