Changing the layout

The submenu Layout of the main menu offers the following possibilities to change the layout of the graph:

• Layout...
  Changes the layout for an individual graph, i.e. either for an individual subgraph or the top-level graph only. This operation can also be invoked by pressing the 'l' key.
• Pass Layout...
  Changes the layout parameters for the selected graph (subgraph or top-level graph) and then passes the setting of all the layout parameters of the selected graph to all its subgraphs.
• Pass Changes...
  Changes the layout parameters for the selected graph (subgraph or top-level graph) and then passes only the setting of the changed layout parameters of the selected graph to all its subgraphs.

After selecting one of these items a boxed subgraph can be chosen for which the layout is to be changed by left-clicking in the box. Right-clicking causes the layout of the top-level graph to be changed.

After that the Layout dialog box appears, where the layout parameters can be changed. The layout parameters take effect when the dialog box is closed by selecting the OK button. This yields a new layout of the graph. Clicking on Cancel causes the old parameters to remain in effect. (See Table 2 for the keyboard commands in this dialog box.)

The following layout parameters can be changed:

• Layout Attributes
  In this section it can be specified whether edge labels are to be drawn, what they look like, where they are positioned and what the edges are to look like.
• Edge labels
• Dirty labels
• Near edges
• Double edges
  If this option is disabled doubled edges are not drawn, i.e. if multiple edges with the same appearance exist between a source node and a target node, only one edge is drawn between these nodes (see also -summarize).
• Fine-tuning
• Splines
• Manhattan edges
• SManhattan edges
• Priority phase
• Straight phase
• Linear segments
• Orientation
• Crossing Heuristics
  Enables the crossing reduction phases to be controlled.
• The crossing reduction method can be selected (see crossing_weight).
• Optimize phase 2
• Optimize local
• Node Alignment
• Arrow Heads
• Inport sharing
• Outport sharing
• Fixed arrow heads
• Adding Labels
• Layout Factors
  Enables all the layout factors to be changed via scrollbars. For example, if the graph is too dense, X Space and Y Space should be increased; if the splines are too sharp, the spline factor should be reduced and the XL Space increased.
• Down factor
• Up factor
• Near factor
• X Base
• Y Base
• X Space
• Y Space
• XL Space
• Spline factor
• Time limit
  Enables a time limit for layout calculation to be set. If the time limit is exceeded, the fastest possible mode for the current iteration phase is activated.
• Maximum Iteration Factors
• Crossingred.
• Medium Shifts
• Center Shifts
• Spread Level
• Tree Factor
• Straight Line
• Bending Reduction
• Minimum Iteration Factors
• Crossing Reduction
• Medium Shifts
• Center Shifts
• Layout Speed
  Enables the layout calculation speed to be controlled via appropriate iteration factor settings. In fact these buttons are shortcuts for changing the iteration factors Crossing Reduction, Medium Shifts, Center Shifts, Straight Line and Bending Reduction all at once.
• Partitioning Algorithm
• Normal
• Dfs
• Maxdepth, mindepth
• Maxdepthslow, mindepthslow
• Maxindegree, minindegree
• Maxoutdegree, minoutdegree
• Maxdegree, mindegree
• Minbackward
• Tree layout

Last modified on 23 September 2003 by webmaster. © 2000-2003 AbsInt.
URL: http://www.aisee.com/manual/unix/31.htm

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