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Allegro CL version 9.0
Unrevised from 8.2 to 9.0.
8.2 version


Arguments: chart-widget

Returns the value of the chart-items-min-index property of a chart-widget. The value may be set at creation time by passing the :chart-items-min-index initarg, or any time later by calling (setf chart-items-min-index).

chart-items-min-index is the index of the first chart item of a chart-widget that should be displayed at the current time. The value should be a non-negative integer, or else nil to effectively default to zero. The default value is nil.

If set-chart-value has been used to add items to the chart, then any item whose index is less than this property value (if it is a number) will not appear in the chart. When the property value is nil or zero, then no items are excluded. This property can be used to display only a subset of collected values that are of interest at the moment.

If instead a chart-value-returner function is used for looking up chart data, then this property could be used if your function handles a range of item indeces that does not begin at zero.

To permanently remove older items rather than temporarily excluding them from view, use chart-items-limit.

See also chart-items-max-index.

See chart-widget and also cg-chart-widget.htm.

Copyright (c) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 9.0. This page was not revised from the 8.2 page.
Created 2012.5.30.

Allegro CL version 9.0
Unrevised from 8.2 to 9.0.
8.2 version