SVGGraph options: dataset_axis

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Option name:
Default value:
Added in version:
Data type:
array [?]

The datatypes used in this documentation for specifying SVGGraph options are described below. All options can be a literal value of the data type described, a variable containing the data type, or an expression that will produce the data type when evaluated (and they must always be valid PHP expressions).

An array, the number and data types of its members will depend on the option for which is it used.
A boolean TRUE or FALSE value, or any values that convert easily such as 1, "1", 0 and "".
A callable function, which can be either the name of a function or an anonymous function itself.
Any of the colour values supported by SVG inside a single or double quoted string. These include three and six digit hex codes, RGB and RGBA colours, and colour names. SVG uses "none" for no colour, which generally leaves things transparent.
A colour value or one of the gradients and patterns supported by SVGGraph. See the SVGGraph colours page for details.
A negative or positive whole number or 0.
An integer or float value, or a string containing a number followed by one of these CSS units: px, in, cm, mm, pt, pc.
Any number supported by PHP, for example 1 or -3.2 or 1.63e5 or M_PI.
Single or double quoted strings. Remember to double-quote your strings if you are inserting a line break:
"Line 1\nLine 2".
Supported by:
BarAndLineGraph GroupedBar3DGraph GroupedBarGraph GroupedCylinderGraph MultiLineGraph MultiScatterGraph StackedBarAndLineGraph
axis multi-axis

Enables multiple Y-axes.

This option allows you to enable secondary Y axes on the right of the graph. The value of the option should be an array containing axis number values for each dataset, starting with axis 0 on the left and axes 1, 2, 3, etc. drawn on the right of the graph.


$settings['dataset_axis'] = array(0, 1, 0, 2);

This will plot dataset 0 against the left axis, dataset 1 against the first right axis, dataset 2 against the left axis and dataset 3 against the second right axis. If there are more datasets than this they will be plotted against the left axis. Extra entries in the dataset_axis array are ignored, so if there are only two datasets in the data for the example above there will only be one secondary axis drawn.

The axis on the left of the graph (axis 0) is always the primary axis that the grid lines are drawn from - the axis_right option is ignored where there are multiple axes.

Each axis can be labelled and divided individually - see the relevant axis options for details and the multiple Y-axis graphs page for more examples.

Note: for StackedBarAndLineGraph only line datasets can be plotted against a secondary axis. This is so that the stacked bars will use the same scale.

See also:
axis_min_v axis_max_v axis_colour_v axis_font_v label_v axis_right

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