Minute needle on Clock



Speed is kept high to understand the relation.

One rotation of second needle will shift minute needle by 6 degree or 1 minute.

HTML

<canvas id="my_canvas" width="500" height="400"  style="border:1px solid #000000;"></canvas>

JQUERY

<script>
$(document).ready(function() {

var my_canvas=$('#my_canvas').get(0)
var gctx = my_canvas.getContext("2d");
var ang_second=90;
var ang_minute=90;
var angle_jump=6;
var r=160;
var x=my_canvas.width/2;
var y=my_canvas.height/2;
speed=10; // Adjust the speed of rotation here

arc_angle=10;// angle of oppisite end of second niddle

////////////
my_function=function my_function(){

gctx.clearRect(0, 0, my_canvas.width,my_canvas.height);

for(j=0;j<360;j += angle_jump){
j_radian=j*(Math.PI/180);

gctx.beginPath()
gctx.strokeStyle= '#464623';
if((j % (5*angle_jump))==0){
var y1_out=y+ 1.1*r*Math.sin(j_radian);
var x1_out=x+ 1.1*r*Math.cos(j_radian);
}else{
var y1_out=y+ 1.15*r*Math.sin(j_radian);
var x1_out=x+ 1.15*r*Math.cos(j_radian);
}

var y2_out=y+ 1.2*r*Math.sin(j_radian);
var x2_out=x+ 1.2*r*Math.cos(j_radian);

gctx.moveTo(x1_out,y1_out);
gctx.lineTo(x2_out,y2_out);
gctx.stroke();
}
/////////////////////
gctx.beginPath()
gctx.strokeStyle= '#46d2f5'; // border color of the second needle 
var startAngle=(1/180) * (360-ang_second); // In degree 
var a_end_ang=(1/180) * (360-(ang_second + 180 -arc_angle));
var a_start_ang=(1/180) *(360-(ang_second + 180 + arc_angle));

var y1=y+ r*Math.sin(startAngle*Math.PI);
var x1=x+ r*Math.cos(startAngle*Math.PI);

gctx.moveTo(x1,y1); // Coordinate of tip of the needle
gctx.arc(x,y,0.3*r,a_start_ang*Math.PI,a_end_ang*Math.PI);
gctx.lineTo(x1,y1); // Full second needle path
gctx.fillStyle = '#46d2f5'; // fill colour of the second needle
gctx.fill();
gctx.stroke(); // draw the second needle 
//////////////////////////////////

///////////Minute Needle//////////
gctx.beginPath()
gctx.strokeStyle= '#f5d200'; // border color of the minute needle 
var startAngle=(1/180) * (360-ang_minute); // In degree 
var a_end_ang=(1/180) * (360-(ang_minute + 180 -arc_angle));
var a_start_ang=(1/180) *(360-(ang_minute + 180 + arc_angle));

var y1=y+ 0.9*r*Math.sin(startAngle*Math.PI);
var x1=x+ 0.9*r*Math.cos(startAngle*Math.PI);

gctx.moveTo(x1,y1); // Coordinate of tip of the needle
gctx.arc(x,y,0.3*r,a_start_ang*Math.PI,a_end_ang*Math.PI);
gctx.lineTo(x1,y1); // Full minute needle path
gctx.fillStyle = '#f5d200'; // fill colour of the minute needle
gctx.fill();
gctx.stroke(); // draw the minute needle 
//////////////////////////////////
/// small Circle at center of the clock 
gctx.beginPath()
gctx.strokeStyle= '#000000';
gctx.arc(x,y,3,0,2*Math.PI); 
gctx.fillStyle = '#ff00ff';
gctx.fill();
gctx.stroke();
my_function2();
}
////////

my_function2=function my_function2(){
if(ang_second > -270){	
ang_second=ang_second-angle_jump;
my_time=setTimeout('my_function()',speed)
}else{
ang_second=90;
ang_minute=ang_minute - angle_jump;

my_time=setTimeout('my_function()',speed)
}
}
/////////
my_function();
})
</script>