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


Arguments: line-graph-view

Returns the value of the span-missing-items property of a line-graph-view. The value may be set at creation time by passing the span-missing-items initarg, or any time later by calling (setf span-missing-items).

A boolean value indicating whether line segments will be drawn across chart items that have no values in a line-graph-view of a chart-widget. The default value is nil.

The chart-widget allows any combination of a chart item and chart object to either have a value or not. When there is no value, nothing is drawn on the chart for that chart item and object.

A special case is that a chart object may have no value for a sequence of one or more chart items, but have values for items on both sides of that sequence of items. This raises the question as to whether a line should be drawn between the groups of items that do have values.

If span-missing-items is true, then a single straight line is drawn between the last chart item before the sequence of non-value items and the first item after the no-value items. If span-missing-items is nil, then no such line is drawn, and lines will connect only contiguous items that all have values.

This property is used only when the draw-lines property is true.

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