function x2 (t) return 2^t * cos (PI/2-2*PI*t);  // blue
function y2 (t) return 2^t * sin (PI/2-2*PI*t);

svg_open (200,200,100,100,'einheit=0.5');
  //svg_kreuz (10);
  svg_kurve (x2,y2,  2, 3 
             ,'zoom=10', 'sf=blue' );
  for(i=0;i<12;i++) {
    t=i/12;
    svg_strecke(0,0, x2(t)*10*4,y2(t)*10*4 ,'sd=0.1');
  }
w= 0/12;svg_punkt ( x2(0)*40 ,y2(0)*40,"sf=red","sd=1"); svg_text(x2(0)*40,y2(0)*40,'C');
w= 1/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'Cis');
w= 2/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'D');
w= 3/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'Dis');
w= 4/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'E');
w= 5/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'F');
w= 6/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'Fis');
w= 7/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'G');
w= 8/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'Gis');
w= 9/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'A');
w=10/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'Ais');
w=11/12;svg_punkt ( x2(w)*40, y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,'B');
w=12/12;svg_punkt ( x2(w)*40 ,y2(w)*40,"sf=red","sd=1"); svg_text(x2(w)*40,y2(w)*40,"C'");
svg_close 'ets.svg';