html5繪製時鐘動畫_html5教學技巧

複製程式碼

程式碼如下:

var clock=document.getElementclock=document" ");
var cxt=clock.getContext("2d");
function drawNow(){
var now=new Date();
var hour=now.getHours();
var min=now.getMinutes();
var sec=now.getSeconds();
hour=hour>12?hour-12:hour;
hour=hour min/60;
//錶盤(藍色)
cxt.lineWidth=10;
cxt.strokeStyle="blue"
cxt.beginPath();
cxt.arc(250,250,200,0,60,false);
cxt.closePath();
cxt.stroke();
//刻度
//時刻度
for(var i=0;i cxt.save();
cxt.lineWidth=7;
cxt.strokeStyle="black";
cxt.translate(250,250);
cxt.rotate(i*30*Math. PI/180);//旋轉角度角度*Math.PI/180=弧度
cxt.beginPath();
cxt.moveTo(0,-170);
cxt.lineTo(0,- 190);
cxt.closePath();
cxt.stroke();
cxt.restore();
}
//分刻度
for(var i=0 ;i cxt.save();
//設定分刻度的粗細
cxt.lineWidth=5;
//重設畫布原點
cxt. translate(250,250);
//設定旋轉角度
cxt.rotate(i*6*Math.PI/180);
//畫分針刻度
cxt.strokeStyle="black";
cxt.beginPath();
cxt.moveTo(0,-180);
cxt.lineTo(0,-190);
cxt.closePath();
cxt.stroke ();
cxt.restore();
}
//時針
cxt.save();
// 設定時針風格
cxt.lineWidth=7;
cxt.strokeStyle="black";
cxt.translate(250,250);
cxt.rotate(hour*30*Math.PI/180);
cxt.beginPath();
cxt .moveTo(0,-140);
cxt.lineTo(0,10);
cxt.closePath();
cxt.stroke();
cxt.restore();
//分針
cxt.save();
cxt.lineWidth=5;
cxt.strokeStyle="black";
//設定異次元空間分針畫布的中心
cxt .translate(250,250);
cxt.rotate(min*6*Math.PI/180);
cxt.beginPath();
cxt.moveTo(0,-160);
cxt .lineTo(0,15);
cxt.closePath();
cxt.stroke()
cxt.restore();
//秒針
cxt.save();
//設定秒針的風格
//顏色:紅色
cxt.strokeStyle="red";
cxt.lineWidth=3;
//重設原點
cxt.translate (250,250);
//設定角度
//cxt.rotate(330*Math.PI/180);
cxt.rotate(sec*6*Math.PI/180);
cxt.beginPath();
cxt.moveTo(0,-170);
cxt.lineTo(0,20);
cxt.closePath();
cxt.stroke();
//畫出時針,分針,秒針的交叉點
cxt.beginPath();
cxt.arc(0,0,5,0,360,false);
cxt.closePath();
//設定填滿
cxt.fillStyle="gray";
cxt.fill();
//cxt.strokeStyle="red";
cxt.stroke();
//畫出秒針的小圓點
cxt.beginPath();
cxt.arc(0,-140,5,0,360,false);
cxt.closePath();
//設定填滿
cxt.fillStyle="gray";
cxt.fill();
//cxt.strokeStyle="red";
cxt.stroke();

cxt.restore();

}
function drawClock(){
cxt.clearRect(0,0,500,500);
drawNow();
}
drawNow();