Here you have the reference for the properties available for all charting libraries. Any library that doesn't implements some of this properties should document it so in it's specific page.

Properties list

Properties

colour

The colour property sets the graph background colour. It should contain the hex value of the colour.

Example:
<?php
$canvas->colour = '#123456' // This way you get a dark blue background.

height

The height property sets the graph height in pixels.

Example:
<?php
$canvas->height = 300;

series

The series property sets the data to be plotted on the graph.

It's an associative array of arrays. The keys are the data series names (which will appear on the legend of the graph). Each inside array holds the values for that data serie.

In a pie chart there should be only one data series and the key for this data serie is ignored as the values are named after the x labels.

Example:
<?php
$canvas->series = array(
  array(1000, 1200, 1300, 1150),
  array(345, 1300, 120, 937),
);

series_colours

The series_colours property sets the series colours. It should contain an array of hex value of the desired colours.

Example:
<?php
$canvas->series_colours = array('#123456', '#654321); // This way you get a dark blue and a medium brown.

title

The title property sets the graph title.

Example:
<?php
$canvas->title = 'Graph title';

type

The type property sets the graph type. All charting libraries support at least the following types:

bar
Bar graph
line
Line graph
pie
Pie graph
Example:
<?php
$canvas->type = 'line';
Others standardized graph types

Here is a complete list of standardized chart types (see each charting library Advanced Help page for a specific list of supported chart types):

area
Area graph. It's similar to a line graph with line/axis area painted.
donut
Similar to a pie graph but with a hole in the middle.
side_bar
Side bar graph, also known as sidebar.
stacked_area
Similar to an area graph where each new data series is presented above the other.
stacked_bar
Similar to a bar graph where the bars for the same x reference are stacke one over the other instead of being side by side.
stacked_side_bar
Similar to a side bar graph where each bar for the same y reference is put to the right of each other instead of one below the other.
Other graph types

Each charting library might support other graph types. Please see the accompanying Advanced Help page or the charting library documentation page.

width

The width property sets the graph width in pixels.

Example:
<?php
$canvas->width = 500;

x_labels

The x_labels property sets the labels for each point in the x axis of the graph.

In a pie chart these are the names used to identify each value in the data series.

Example:
<?php
$canvas->x_labels = array('2007', '2008', '2009', '2010');

y_legend

The y_legend property sets the text presented next to the y axis of the graph.

Example:
<?php
$canvas->y_legend = 'population';

y_min

The y_min property sets the minimum value to be presented in the y axis of the graph.

Example:
<?php
$canvas->y_min = -18;

y_max

The y_max property sets the maximum value to be presented in the y axis of the graph.

Example:
<?php
$canvas->y_max = 164;

y_step

The y_step property sets the step used to define intermediate values to be presented in the y axis of the graph.

Example:
<?php
$canvas->y_step = 4;