| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 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) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.
| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |