SVGGraph options: best_fit_type

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Option name:

best_fit_type

Default value:

NULL

Added in version:

3.20

Data type:

string [?]

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).

array: An array, the number and data types of its members will depend on the option for which is it used.
boolean: A boolean TRUE or FALSE value, or any values that convert easily such as 1, "1", 0 and "".
callback: A callable function, which can be either the name of a function or an anonymous function itself.
colour: 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.
fill: A colour value or one of the gradients and patterns supported by SVGGraph. See the SVGGraph colours page for details.
integer: A negative or positive whole number or 0.
measurement: An integer or float value, or a string containing a number followed by one of these CSS units: px, in, cm, mm, pt, pc.
number: Any number supported by PHP, for example 1 or -3.2 or 1.63e5 or M_PI.
string: Single or double quoted strings. Remember to double-quote your strings if you are inserting a line break:
"Line 1\nLine 2".

Per-dataset:

yes [?]

Per-dataset options allow specifying one option for all datasets or an array of options to be used for each dataset in turn. If there are more datasets than entries in the option array, the sequence will be repeated.

Example:

$settings['widget_taste'] = 'banana';
$settings['widget_colour'] = array(
  'red', 'green', 'blue'
);

For this example, the widgets for all datasets will taste of banana. The graph will use red widgets for dataset 0, green widgets for dataset 1 and blue widgets for dataset 2. Dataset 3 repeats the sequence so its widgets will be red, dataset 4 will have green widgets and dataset 5 will have blue widgets.

Supported by:

BarAndLineGraph LineGraph MultiLineGraph MultiScatterGraph MultiSteppedLineGraph ScatterGraph StackedBarAndLineGraph StackedLineGraph SteppedLineGraph

Tags:

best-fit trend line

Limits type of function used for curved best-fit lines.

This option specifies which types of curve will be used to calculate the best-fit line when the best_fit option is set to "curve".

At the moment the available curve types are quintic, quartic, cubic, quadratic and straight. The default type is quintic.

Example:

$settings['best_fit'] = 'curve';
$settings['best_fit_type'] = ['cubic', 'quadratic', null];

This will draw a cubic best-fit line for dataset 0, a quadratic line for dataset 1 and the default quintic line for dataset 2.

The best_fit_type option actually supports supplying an array of types to be used for each dataset, with the function that fits closest to the values being used to draw the line. This will be more useful when I add support for more curve types.

See also:: best_fit

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