code: public void setCMYKColorStrokeF(float cyan, float magenta, float yellow, float black) {
          HelperCMYK(cyan, magenta, yellow, black);
          content.append(" K").append_i(separator);
      }
docs: Changes the current color for stroking paths (device dependent colors!).
  <P>
  Sets the color space to <B>DeviceCMYK</B> (or the <B>DefaultCMYK</B> color space),
  and sets the color to use for stroking paths.</P>
  <P>
  Following the PDF manual, each operand must be a number between 0 (miniumum intensity) and
  1 (maximum intensity).
  
  @param   cyan    the intensity of cyan. A value between 0 and 1
  @param   magenta the intensity of magenta. A value between 0 and 1
  @param   yellow  the intensity of yellow. A value between 0 and 1
  @param   black   the intensity of black. A value between 0 and 1