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w3-canvas_clock.html
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w3-canvas_clock.html
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<html>
<body>
<script>
const canvas=document.createElement("canvas");
canvas.setAttribute("id","canvas");
canvas.style.border="1px solid red";
document.body.appendChild(canvas);
function canvasResize(e){
console.log(e);
canvas.setAttribute("width",1024);
canvas.setAttribute("height",640);
}
canvasResize();
const _2d = canvas.getContext("2d");
const _3d = canvas.getContext("3d");
const clockRadius=(Math.min(canvas.height,canvas.width) / 2);
class Clock{
constructor(height){
this.height=height;
this.radius=height* 0.9;
//console.log(`new Clock(${this.radius}) `);
}
draw(){
this.drawHourLines();
this.drawMinLines();
this.drawNumbers();
this.drawOuterRim();
let time=this.getTime();
this.drawHand(time.hr, this.radius * 0.5,this.radius * 0.05 );
this.drawHand(time.min, this.radius * 0.7,this.radius * 0.03 );
this.drawHand(time.sec, this.radius * 0.7,this.radius * 0.01 );
this.drawCenterRim();
}
start(){
setInterval(() => {
_2d.resetTransform();
_2d.clearRect(0,0,canvas.width, canvas.height);
_2d.translate( clockRadius, clockRadius);
this.draw();
}, 500);
}
stop(){
clearInterval(this.clockThick);
}
getTime(){
const now = new Date();
let hour = now.getHours();
let minute = now.getMinutes();
let second = now.getSeconds();
console.log(now);
hour = hour % 12;
hour = (hour*Math.PI/6)
+(minute*Math.PI/(6*60))
+(second*Math.PI/(360*60));
minute = (minute*Math.PI/30)+(second*Math.PI/(30*60));
second = (second*Math.PI/30);
const t={hr: hour, min: minute, sec: second};
console.log(t);
return t ;
}
drawHourLines(){
//drawing point is at the center of circle
for(let hr = 1; hr <=12; hr++ ){
const ang = hr * Math.PI / 6;
//move in an angle to the hr position
_2d.rotate( ang );
_2d.translate( 0, - this.radius );
//rotate drawing coordinate for hr vertical placements
//_2d.rotate( - ang );
_2d.beginPath();
_2d.rect(0,0,1,20);
_2d.fill();
_2d.closePath();
//rotate to original hr placements
//_2d.rotate( ang );
//back to center of clock;
_2d.translate( 0, this.radius);
//rotate back to original angle
_2d.rotate( - ang );
}
}
drawMinLines(){
const mins=Math.PI / 60;
for(let min = 1; min <=360; min++ ){
const ang = min * mins ;
//move in an angle to the hr position
_2d.rotate( ang );
_2d.translate( 0, - this.radius );
//rotate drawing coordinate for hr vertical placements
//_2d.rotate( - ang );
_2d.beginPath();
_2d.rect(0,0,1,20);
_2d.fill();
_2d.closePath();
//rotate to original hr placements
//_2d.rotate( ang );
//back to center of clock;
_2d.translate( 0, this.radius);
//rotate back to original angle
_2d.rotate( - ang );
}
}
drawOuterRim(){
_2d.beginPath();
_2d.arc( 0, 0, this.radius, 0, 2 * Math.PI);
_2d.lineWidth = this.radius * 0.05;
_2d.stroke();
_2d.closePath();
}
drawCenterRim(){
_2d.beginPath();
_2d.arc(0, 0, this.radius * 0.05, 0, 2 * Math.PI);
_2d.fillStyle = "#777";
_2d.fill();
_2d.closePath();
}
drawNumbers(){
_2d.font = `${this.radius * 0.2}px Arial`;
_2d.textBaseline = "middle";
_2d.textAlign = "center";
//drawing point is at the center of circle
for(let hr = 1; hr <=12; hr++ ){
const ang = hr * Math.PI / 6;
//move in an angle to the hr position
_2d.rotate( ang );
_2d.translate( 0, - this.radius * 0.8 );
//this.drawNumberDot();
//rotate drawing coordinate for hr vertical placements
_2d.rotate( - ang );
_2d.fillText( hr.toString() , 0,0 );
//rotate to original hr placements
_2d.rotate( ang );
//back to center of clock;
_2d.translate( 0, this.radius * 0.8 );
//rotate back to original angle
_2d.rotate( - ang );
}
}
drawHand( pos, length, width) {
_2d.beginPath();
_2d.lineWidth = width;
_2d.lineCap = "round";
_2d.moveTo(0,0);
_2d.rotate(pos);
_2d.lineTo(0, -length);
_2d.stroke();
_2d.rotate(-pos);
_2d.closePath();
}
}
var c=new Clock( clockRadius );
c.start();
setTimeout(()=>{
c.stop();
},10000);
</script>
</body>
</html>