I was wondering if the colour of polygon components can be specified in RGBA for Pavlovia experiments?
I keep getting this error:
“The argument should be an array of numbers of length 3”.
This error disappears when I delete the alpha channel.
I am trying to hold the colour of two circle polygon components constant at black, and vary their luminance by varying the alpha value:
ContinuousCirc.setFillColor([-1, -1, -1, alpha])
ContinuousCirc.setLineColor([-1, -1, -1, alpha])
Is there any other way I can manipulate the luminance of a polygon component?