y-axis

Arguments: plot-widget

Returns the value of the y-axis property of a plot-widget. The value may be set at creation time by passing the y-axis initarg to make-instance when creating a plot-widget, or any time later by calling (setf y-axis).

The y-axis of a plot-widget is the primary vertical axis of the widget, and always lies along the left side of the plot. If a secondary vertical axis is desired along the right side of a plot, then use the y-axis-2 property for that.

The value of the y-axis property should be an instance of the plot-value-axis class, and holds properties that determine how the axis is drawn and the range of values that it displays. The properties are inherited from the value-axis and chart-axis classes.

The value of this property will always be a plot-value-axis instance. If you do not pass a plot-value-axis instance as the value of the y-axis initarg when creating a plot-widget, then a default instance is created automatically.

If there are multiple chart objects (see chart-objects), then some of the objects may use this axis for their y coordinates while others use the y-axis-2 axis.

See also x-axis, x-axis-2, y-axis-2, and plot-widget.

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Created 2010.1.21.