Generic Function | Package: cg | ToC | DocOverview | CGDoc | RelNotes | FAQ | Index | PermutedIndex
| Allegro CL version 9.0 Unrevised from 8.2 to 9.0. 8.2 version

## major-tic-increment

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.

Copyright (c) 1998-2019, Franz Inc. Oakland, CA., USA. All rights reserved.
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