library_books<canvas id="canvas" width="220" height="220"></canvas>

<script type="text/javascript">
var canvas = document.getElementById("canvas");
var angle=0,centerw=canvas.width/2,centerh=canvas.height/2;

function pattern(){
  var ctx = canvas.getContext("2d");
  ctx.lineWidth=.5;
  ctx.globalCompositeOperation="lighter";
  while(angle<360){
    ctx.save();
    ctx.translate(centerw,centerh);
    ctx.rotate(angle*Math.PI/180);
    ctx.translate(-centerw,-centerh)
    ctx.beginPath();
    ctx.strokeStyle="teal";
    ctx.moveTo(centerw-10,centerh);ctx.lineTo(centerw,20);ctx.stroke();
    ctx.beginPath();
    ctx.strokeStyle="red";
    ctx.moveTo(centerw-20,centerh);ctx.lineTo(centerw,20);ctx.stroke();
    ctx.restore();
  
    angle%=362;
    angle+=20;
  }
}
pattern();
</script>