var canvas=document.getElementById('jindu');
context=canvas.getContext('2d');
var rad=Math.PI*2/100;
//將360度分成100份,那麼每一份就是rad度
//繪製外圈
function whiteCircle(x,y,color){
context.save();
context.beginPath();
context.arc(x,y,40,0,2*Math.PI,false);
//畫筆中心,半徑,起始角度,結束角度,false(逆時針)
context.strokeStyle=color;
context.lineWidth=15;
context.stroke();
context.closePath();
context.restore();
}
//根據速度繪製進度圈
function progress(x,y,color,n){
context.save();
context.beginPath();
context.arc(x,y,40,1.5*Math.PI,1.5*Math.PI+n*rad,false);
context.strokeStyle=color;
context.lineWidth=15;
context.stroke();
context.closePath();
context.restore();
}
//繪製百分比文字
function text(x,y,n){
context.save();
context.strokeStyle='#fff';
context.font='12px Arial';
context.strokeText(n.toFixed(0)+'%',x-8,y);
//context.stroke();
context.restore();
}
//定義速度
var speed=0.1;
var speed1=0;
var back=window.setInterval(function(){
context.clearRect(0,0,canvas.width,canvas.height);//清理之前的畫筆
whiteCircle(canvas.width/8,canvas.height/3,"#24294f");//繪製外圈
progress(canvas.width/8,canvas.height/3,"#ae81e6",speed);//根據速度繪製進度圈
text(canvas.width/8,canvas.height/3,speed);//繪製百分比文字
speed+=0.1;
speed1+=0.008;
if(speed>100) {speed=0;
// window.clearInterval(back);
}
},10);
var canvas=document.getElementById('jindu');
context=canvas.getContext('2d');
var rad=Math.PI*2/100;
//將360度分成100份,那麼每一份就是rad度
/繪製外圈
function whiteCircle(x,y,color){
context.save();
context.beginPath();
context.arc(x,y,40,0,2*Math.PI,false);
//畫筆中心,半徑,起始角度,結束角度,false(逆時針)
context.strokeStyle=color;
context.lineWidth=15;
context.stroke();
context.closePath();
context.restore();
}
//繪製百分比文字
function text(x,y,n){
context.save();
context.strokeStyle='#fff';
context.font='12px Arial';
context.strokeText(n.toFixed(0)+'%',x-8,y);
//context.stroke();
context.restore();
}
//繪製紅色進度
function redCircle(x,y,color){
context.save();
context.beginPath();
context.arc(x,y,40,(1.5+speed1)*Math.PI,(0+speed1)*Math.PI,false);//畫筆中心,半徑,起始角度,結束角度,false(逆時針)
context.strokeStyle=color;
context.lineWidth=15;
context.stroke();
context.closePath();
context.restore();
}
//速度
var speed=0.1;
var speed1=0;
var back=window.setInterval(function(){
context.clearRect(0,0,canvas.width,canvas.height);//清理之前的畫筆
whiteCircle(canvas.width/2.79,canvas.height/3,"#30203b");
//根據速度繪製進度圈
redCircle(canvas.width/2.79,canvas.height/3,"#d4315e");
text(canvas.width/2.79,canvas.height/3,speed);
speed+=0.1;
speed1+=0.008;
if(speed>25) {speed=0;
//window.clearInterval(back);
}
},10);