The legend is a side section of the chart that gives a small text description of each series. You can specify the text associated with each series in this legend, and specify where on the chart it should appear.
A Note on String Values
Only URL-safe characters are permitted in label strings. To be safe, you should URL-encode any strings containing characters not in the character set
chdl=<data_series_1_label>|...|<data_series_n_label> chdlp=<opt_position>|<opt_label_order> chdls=<color>,<size>
chdl - The text for each series, to display in the legend.
<data_series_label>The text for the legend entries. Each label applies to the corresponding series in the chd array. Use a + mark for a space. If you do not specify this parameter, the chart will not get a legend. There is no way to specify a line break in a label. The legend will typically expand to hold your legend text, and the chart area will shrink to accommodate the legend.
chdlp [Optional] The position of the legend, and order of the legend entries. You can specify
<label_order>. If you specify both, separate them with a bar character. You can add an 's' to any value if you want empty legend entries in
chdl to be skipped in the legend. Examples:
<opt_position>[Optional] Specifies the position of the legend on the chart ( partially supported). To specify additional padding between the legend and the chart area or the image border, use the chma parameter. Choose one of the following values:
b- Legend at the bottom of the chart, legend entries in a horizontal row.
t- Legend at the top of the chart, legend entries in a horizontal row.
r- [Default] Legend to the right of the chart, legend entries in a vertical column.
l- Legend to the left of the chart, legend entries in a vertical column.
<opt_label_order>[Optional] The order in which the labels are shown in the legend. Choose one of the following value:
l- [Default for vertical legends] Display labels in the order given to chdl.
r- Display labels in the reverse order as given to chdl. This is useful in stacked bar charts to show the legend in the same order as the bars appear.
0,1,2... - Custom label order. This is a list of zero-based label indexes from chdl, separated by commas.
chdls - [Optional] Specifies the color and font size of the legend text.
<color>The legend text color, in RRGGBB[AA] hexadecimal format.
<size>The point size of the legend text.
How to specify legend text in the same order as your data series:
How to change legend font color and size:
Here is how to specify a chart with a right legend position:
Here is how to specify a chart with a left legend position:
Here is how to specify a chart with a bottom legend position:
Here is how to specify a chart with a top legend position: