| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |
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) 1998-2016, 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 |