Setting colours in code
In Python colours are simply defined by a list of three numbers, representing red, green and blue on a scale of -1 to +1.
Online you have to define a colour object using these three numbers. Builder components create these colour objects automatically, as do text.setColor(newColor) or polygon.setFillColor(newColor) in code components (where newColor can be either a colour name or a list of three numbers).
Polygon border colours can also be set via the component. On the other hand, if you want to set a polygon border colour in code then you need to change the JavaScript side from polygon.setLineColor(newColor) to polygon.setLineColor(new util.Color(newColor))
To avoid this manual translation, I create colour objects in a Both code component in my setup routine.
For example:
Python
white = "white"
grey = [0, 0, 0]
transparent = None;
JavaScript
white = new util.Color("white");
grey = new util.Color([0, 0, 0]);
transparent = null;
Then polygon.setLineColor(white) or text.LineColor(transparent) will work in an Auto translated code component. Do not use polygon.setBorderColor(newColor) since this will fail online.