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## 3.4.4 Row Adjustment Panel

The concealable right panel in the Timeline window contains the row adjustment panel, which is used to determine the row adjustment scheme. There are two different modes in the row adjustment panel: row count mode and row height mode. These two modes can be selected by the pulldown menu at the top of the panel. The row count mode attempts to keep the number of timelines constant, as indicated in the row count text field when the Timeline window resizes. On the other hand, the row height mode fixes the height of each timeline as indicated by the row height text field. Currently, the height of the timeline can be adjusted up to the height of the timeline canvas; in that case the row count text field shows the number 1.3.7 The maximum number of timelines that can be displayed is set to the total number of rows represented by the whole y-axis label tree3.8. For a multiple-viewmaps slog2 file, the y-axis label tree can be expanded or collapsed. This could change the maximum number of rows in the row count slider after the user hits the CanvasReDraw button. Together with window resize, the row adjustment panel allows the user to magnify or shrink the height of the timeline as desired.

Figure 3.22: Row Adjustment Panel determines the Timeline window's resize scheme. When one of the mode sliders or text fields is adjusted, the other three components will be adjusted simultaneously.
[Row Count mode] [Row Height mode]

#### Footnotes

...3.7
  If the slog2 file contains numerous timelines, increasing the row height will increase the size of the images managed by Jumpshot-4. This action may cause the Java Virtual Machine to exhaust all its memory if the virtual machine is not set to have enough memory when Jumpshot-4 is started or if there isn't enough physical memory in the machine that Jumpshot-4 runs on.
... tree3.8
  Hence the row height cannot be adjusted all the way to zero.

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