draw-major-grid-lines

Arguments: chart-axis

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

A value indicating whether (and how) grid lines are drawn for the major tic positions of a chart-axis in a chart-widget.

When drawn, a grid line extends across the body of the chart, perpendicular to the axis with which it is associated.

Here are the possible values:

• nil - Major grid lines are not drawn. This is the default value.
• t - Major grid lines are drawn, and are drawn at the major tic positions.
• :after - Each major grid line is drawn midway between its major tic position and the next major tic position. This may be especially useful for delimiting groups of non-stacked bars by drawing lines between the groups, for example, rather than drawing a line through the middle of each group of bars. This choice is probably not aesthetic when draw-minor-grid-lines is true.
• :before - Like :after, except that each grid line is drawn between its official position and that of the previous grid line.
• :between - Like :after and :before except that no grid line is drawn before the first major tic position or after the last one.

See also major-grid-line-color, major-grid-line-dashing, major-grid-line-width, and draw-minor-grid-lines.

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

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This page was not revised from the 8.1 page.
Created 2010.1.21.