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Legend

Draw a chart legend

A legend on a graph is a key that identifies the different data series or categories represented in the plot. It explains what each color on the chart corresponds to, allowing you to correctly interpret the data.


Parameters

Elements / attributes of the <legend> element:

Coordinate parameters (required) that define the print area of ​​the legend
<x1> Starting X coordinate (upper/left corner)
<y1> Starting Y coordinate (upper/left corner)
<x2> Ending X coordinate (bottom/right corner)
<y2> Ending Y coordinate (bottom/right corner)

Parameters that define the appearance of the graph:
<border> Show or hide border. Possibile values:
0 Disable (hide) border
1 Enabled (show) border
1111 Enabled (shows) the border for each side of the frame area (left, top, right, bottom). You can show/hide each side of the border individually.
<radius> Radius of the corners of the legend background (if set to zero the background is a rectangle)
<visibile> Set legend visibility. Possible values:
1, true, yes, on : legend is visible
0, false, no, off : legend is hidden
<opacity> A numeric value (float) between 0 (completely transparent) and 1 (completely opaque). For example, setting a value of 0.5 results in 50% transparency

If the legend is printed in the internal area of ​​the graph, set a transparency factor (e.g. opacity = 0.5) so that you can see the graph below the legend.