If the first OutputParameterInfo has no color assigned through setColor(color), ALL subsequent OutputParameterInfo objects will get random colors assigned, even if they have colors assigned.

Example: first param DrawingStyle.NONE, no color assigned...

        outputParameterInfos = new OutputParameterInfo[] {
            new OutputParameterInfo("Idx", OutputParameterInfo.Type.DOUBLE, OutputParameterInfo.DrawingStyle.NONE)
                {{
                }},
           new OutputParameterInfo("Max", OutputParameterInfo.Type.DOUBLE, OutputParameterInfo.DrawingStyle.HISTOGRAM)
                {{
                     setColor(Color.GREEN);                    // <=== will get a random color assigned instead of green
                }},
          ...

workaround:
assigning ALL OutputParameterInfo objects a color regardless even the ones with DrawingStyle.NONE will lead to the engine using the set colors.

        outputParameterInfos = new OutputParameterInfo[] {
            new OutputParameterInfo("Idx", OutputParameterInfo.Type.DOUBLE, OutputParameterInfo.DrawingStyle.NONE)
                {{
                      setColor(Color.BLACK);                    // <=== dummy assignment as workaround
               }},
           new OutputParameterInfo("Max", OutputParameterInfo.Type.DOUBLE, OutputParameterInfo.DrawingStyle.HISTOGRAM)
                {{
                     setColor(Color.GREEN);                    // <=== ... will lead to correctly processing this setColor-statement
                }},
          ...

Best, RR.