protected void strokeFromCalc() {
    stroke = true;
    strokeR = calcR;
    strokeG = calcG;
    strokeB = calcB;
    strokeA = calcA;
    strokeRi = calcRi;
    strokeGi = calcGi;
    strokeBi = calcBi;
    strokeAi = calcAi;
    strokeColor = calcColor;
    strokeAlpha = calcAlpha;
  }