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Allegro CL version 8.1
This page is new in 8.1. Moderate update since 8.1 release.


Arguments: value-axis

Returns the value of the major-tic-increment property of a value-axis. The value may be set at creation time by passing the major-tic-increment initarg, or any time later by calling (setf major-tic-increment).

The value increment between successive major tic positions of a value-axis in a chart-widget. The value should be a positive real number, or else nil for the value to be computed automatically. The default value is nil.

When the value is computed automatically, this is done after the range-bottom and range-top of the value-axis have been determined. Then a major-tic-increment is chosen such that there are a few major increments between the range-bottom and range-top, at relatively "round" values.

As an example of specifying this property explicitly, let's say that you have data values that range from 307 to 384. If you set the range-bottom property to 300 and range-top to 400, then setting major-tic-increment to 20 would produce major tic positions at 300, 320, 340, 360, 380, and 400. Setting minor-tics-per-major-tic to 4 would then produce minor tic positions at 300, 305, 310, 315, 320, and so on.

To make the values increase in the atypical direction, use invert-axis rather than a negative major-tic-increment.

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

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Documentation for Allegro CL version 8.1. This page is new in the 8.1 release.
Created 2007.4.30.

Allegro CL version 8.1
This page is new in 8.1. Moderate update since 8.1 release.