code: public ComplexPixel mult(double r, double i){
  		double thisr = real(), thisi = imag();
  		return setComplex(thisr*r-thisi*i, thisr*i+thisi*r);
  	}
docs: Multiplies a complex number to this pixel. This performs a complex multiplication
  and stores the result in this pixel.
  @param r real part to multiply
  @param i imaginary part to multiply
  @return this