public class TestMISApplet extends MISApplet {

    public void initFrame(double time) {
	    centerY = 256* (1+Math.cos(time));
	    centerX= ((50*time)%256);
	    factorC=50*(1+Math.cos(2.5*time));
	    

	    

    }
    public void setPixel(int x, int y, int rgb[]) {

       double X = x-W/2;
       double Y = y-H/2;

       rgb[0] = rgb[1] = rgb[2] = (int)(255 * line(X, centerX) * line(Y,centerY));
       double circ = diskVar(X*X+Y*Y, W/8,28);
       double len;
       if (Y!=0){
	       len = Math.atan(X/Y)/(2*Math.PI);
       }
       else{
	       if (X>=0)
		       len = 1/4;
	       else
		       len = -1/4;
       }
       if (Y>0)
	       len += 1/2;
       len+=1/4;
       len = Math.tan(10*2*Math.PI*len);
       double circ2 = diskVar(X*X+Y*Y, W/8,30);
       double circ3 = diskVar2(X*X+Y*Y, W/5,1+len*factorC);
       //double circ = circle(X*X+Y*Y, W/8);

       rgb[0] = (int)(127 * line(x, centerX) );
       rgb[2] = (int)(127 * line(y, centerY) );
       rgb[1] = (int)(127 * line(x, centerX)*line(y,centerY ));
       for (int toto=0;toto<2;toto++){
	       rgb[toto]+= (int)(100*circ);
	       rgb[toto]+= (int)(50*circ3);
       }

       
    }
//---------------------------------------------------------

    private double disk(double rr, double R) {
       double dd = rr - R*R;
       return dd >= 2*R ? 0 : dd <= -2*R ? 1 : (2*R - dd) / (4*R);
    }

    private double diskVar(double rr, double R, double marg) {
       double dd = rr - R*R;
       return dd >= marg*R ? 0 : dd <= -marg*R ? 1 : (marg*R - dd) / (2*marg*R);
    }

    private double diskVar2(double rr, double R, double marg) {
       double dd = rr - R*R;
       return dd >= marg*R ? 0 : dd <= -2*R ? 0 : ((marg+2)/2*R - dd) / ((2+marg)*R);
    }


    private double circle(double rr, double R) {
	    double dd=rr-R*R;
	    return dd>=2*R? 0 : dd <= -2*R? 0 : 1;
    }

    private double line(double x1, double x0) {
	    return x1>=1.5*x0 ? 0: x1<=0.5*x0 ? 1: 1.5-x1/x0; 
    }
	    
    private double centerX=0, centerY=0, factorC=1;
}