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When you plot several data series, or use a pie chart, RainPro will work through a standard sequence of colours, shading patterns, markers and so on. These series have been intentionally chosen to be of varying lengths to reduce the chance of any two data-series being plotted in the same combination.
To over-ride the colour series:
ch.Set 'colour' 'red,blue,#FFC0C0'
Note that you can use the standard internet colour names or the hex-style 24-bit specification here. You may also use the colour numbers directly the values from 0-15 are the 16 basic colours (0=black ... 15=white) and higher numbers are an integer encoding of the RGB value in the form ((256×256×Red)+(256×Blue)+Green). This may be more convenient if you are computing the colours with an algorithm, or you simply have very many lines to set.
ch.Set 'colour' (12 12 0 0 2)
The cycle will persist from the point where you set it, until you set this property again this allows you to set it once only for a series of several plotting calls.
See also ...
Lines line-style cycle
Markers marker cycle
Nibs nib weight cycle
Patterns pattern cycle