为圆环添加背景色

Question

我有这个代码，创建倒计时与戒指感谢开发者codepen

https://codepen.io/l422y/pen/cdwhm

如何在标签后面的环的内侧添加背景色?我试图将此代码添加到每个部分r.ctx美元。backgroundColor = "#d0d0d0"但是什么也没发生我可以看到一些样式属性，但是没有影响到背景颜色标签后面

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
var ringer = {
countdown_to: new Date("25/11/2021") ,
rings: {
'DAYS': {
s: 86400000, // mseconds in a day,
max: 365
},
'HOURS': {
s: 3600000, // mseconds per hour,
max: 24
},
'MINUTES': {
s: 60000, // mseconds per minute
max: 60
},
'SECONDS': {
s: 1000,
max: 60
},
},
r_count: 4,
r_spacing: 40, // px
r_size: 120, // px
r_thickness: 2, // px
update_interval: 11, // ms

init: function(){
$r = ringer;
$r.cvs = document.createElement('canvas');
$r.size = {
w: ($r.r_size + $r.r_thickness) * $r.r_count + ($r.r_spacing*($r.r_count-1)),
h: ($r.r_size + $r.r_thickness)
};

$r.cvs.setAttribute('width',$r.size.w);
$r.cvs.setAttribute('height',$r.size.h);
$r.ctx = $r.cvs.getContext('2d');
$(".countdownwrap").append($r.cvs);
$r.cvs = $($r.cvs);
$r.ctx.textAlign = 'center';
$r.actual_size = $r.r_size + $r.r_thickness;
$r.countdown_to_time = new Date($r.countdown_to).getTime();
$r.cvs.css({ width: $r.size.w+"px", height: $r.size.h+"px" });
$r.go();
},
ctx: null,
go: function(){
var idx=0;
$r.time = (new Date().getTime()) - $r.countdown_to_time;

for(var r_key in $r.rings) $r.unit(idx++,r_key,$r.rings[r_key]);
setTimeout($r.go,$r.update_interval);
},
unit: function(idx,label,ring) {
var x,y, value, ring_secs = ring.s;
value = parseFloat($r.time/ring_secs);
$r.time-=Math.round(parseInt(value)) * ring_secs;
value = Math.abs(value);
x = ($r.r_size*.5 + $r.r_thickness*.5);
x +=+(idx*($r.r_size+$r.r_spacing+$r.r_thickness));
y = $r.r_size*.5;
y += $r.r_thickness*.5;

// calculate arc end angle
var degrees = 360-(value / ring.max) * 360.0;
var endAngle = degrees * (Math.PI / 180);
$r.ctx.save();
$r.ctx.translate(x,y);
$r.ctx.clearRect($r.actual_size*-0.5,$r.actual_size*-0.5,$r.actual_size,$r.actual_size);
// first circle
$r.ctx.strokeStyle = "#d0d0d0";
$r.ctx.beginPath();
$r.ctx.arc(0,0,$r.r_size/2,0,2 * Math.PI, 2);
$r.ctx.lineWidth =$r.r_thickness;
$r.ctx.stroke();
// second circle
$r.ctx.strokeStyle = "#D34168";
$r.ctx.beginPath();
$r.ctx.arc(0,0,$r.r_size/2,0,endAngle, 1);
$r.ctx.lineWidth =$r.r_thickness;
$r.ctx.stroke();
// label
$r.ctx.fillStyle = "#000000";
$r.ctx.font = '16px Roboto';
$r.ctx.fillText(label, 0, 30);
$r.ctx.fillText(label, 0, 30);
$r.ctx.font = '54px Roboto';
$r.ctx.fillText(Math.floor(value), 0, 0);
$r.ctx.restore();
}
}
ringer.init();
</script>

Answer 1

你需要第三个圆弧来保持背景色。

将以下代码添加到第88行左右:

// background color circle
$r.ctx.beginPath();
$r.ctx.arc(0,0,$r.r_size/2,0,2 * Math.PI, 2);
$r.ctx.fillStyle = "rgba(200,50,50,0.5)";
$r.ctx.fill();