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

## span-missing-items

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.

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This page was not revised from the 8.2 page.
Created 2012.5.30.

|  | ToC | DocOverview | CGDoc | RelNotes | FAQ | Index | PermutedIndex
| Allegro CL version 9.0 Unrevised from 8.2 to 9.0. 8.2 version