web前端|H5教程
HTML5 ，canvas，可拖拽时钟
web前端-H5教程
下面介绍一个自己搞的小时钟，方便拖拽。
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那么如何插入到自己的界面中呢？
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只需要加上如下代码就好了：
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clcok.js的完整代码如下：
var extra=document.createElement(p); extra.style.position=absolute; var extra_canvas=document.createElement(canvas); extra_canvas.id="extra_canvas"; extra.appendChild(extra_canvas); document.body.appendChild(extra); var flag; var currentRectX; var currentRectY; function init(){flag=true;currentRectX=0;currentRectY=0; } function clock(size,x,y){ /* if(!flag){document.body.removeChild(extra_canvas);console.log( emove); } */ if (!size){size=200;} if (!x)x=0; if (!y)y=0; extra_canvas.width=size; extra_canvas.height=size; var context=extra_canvas.getContext(2d); extra.style.left=currentRectX+px; extra.style.top=currentRectY+px; //console.log(currentRectX,currentRectY); //context.fillStyle=#FF0000; //context.fillRect(0,0,100,100); //绘制表盘var centerX=x+size/2;var centerY=y+size/2; //console.log(centerX,centerY);var radius=(size-40)/2; context.clearRect(x,y,x+size,y+size); context.beginPath(); context.arc(centerX, centerY, radius, 0, 2 * Math.PI, false); context.lineWidth = 5; context.strokeStyle = "grey"; context.stroke(); var grd = context.createLinearGradient(centerX-radius, centerY-radius,centerX+radius, centerY+radius); grd.addColorStop(0, "#FFFFFF"); // light blue grd.addColorStop(1, "#DDDDFF"); // dark blue context.fillStyle = grd; context.fill(); context.closePath(); //绘制数字时刻 context.beginPath(); //context.font="9pt"; // context.fontsize=9px; //context.fontFamily="Square721 BT"; context.fillStyle = "#0000f0"; // text color context.fillText("12",centerX-7,centerY-radius+18); context.fillText("3",centerX+radius-18,centerY+4); context.fillText("6",centerX-3,centerY+radius-12); context.fillText("9",centerX-radius+12,centerY+4); context.closePath();/* //显示日期context.beginPath();context.TextOut(100,100,"星期");context.closePath();*/ //绘制刻度 for (var i=0;i<12;i++){context.beginPath(); if(i%3){ context.lineWidth = 3; context.strokeStyle = "grey"; len=5; }else{ context.lineWidth = 6; context.strokeStyle = "#ff0"; len=10; } arc=i/6*Math.PI; kx=centerX+radius*Math.cos(arc); ky=centerY-radius*Math.sin(arc); context.moveTo(kx,ky); kx=centerX+(radius-len)*Math.cos(arc); ky=centerY-(radius-len)*Math.sin(arc); context.lineTo(kx,ky); context.stroke(); context.closePath();} //绘制表中心context.beginPath();context.arc(centerX, centerY, 4, 0, 2 * Math.PI, false);context.lineWidth = 2;context.strokeStyle = "grey";context.stroke();context.closePath(); //绘制时针分针 var now=new Date(); var hour=now.getHours()%12; var minute=now.getMinutes(); var second=now.getSeconds(); hour=hour+minute/60;//update the time!! minute=minute+second/60; var arc_hour=hour/6*Math.PI; context.beginPath(); kx=centerX+(radius-40)*Math.sin(arc_hour); ky=centerY-(radius-40)*Math.cos(arc_hour); context.moveTo(kx,ky); kx=centerX+10*Math.sin(arc_hour+Math.PI); ky=centerY-10*Math.cos(arc_hour+Math.PI); context.lineTo(kx,ky); context.lineWidth = 6; context.strokeStyle = "black"; context.stroke(); context.closePath(); context.beginPath(); var arc_minute=minute/30*Math.PI; context.beginPath(); kx=centerX+(radius-20)*Math.sin(arc_minute); ky=centerY-(radius-20)*Math.cos(arc_minute); context.moveTo(kx,ky); kx=centerX+20*Math.sin(arc_minute+Math.PI); ky=centerY-20*Math.cos(arc_minute+Math.PI); context.lineTo(kx,ky); context.lineWidth = 4; context.strokeStyle = "red"; context.stroke(); context.closePath();// flag=false; context.beginPath(); var arc_second=second/30*Math.PI; context.beginPath(); kx=centerX+(radius-20)*Math.sin(arc_second); ky=centerY-(radius-20)*Math.cos(arc_second); context.moveTo(kx,ky); kx=centerX+20*Math.sin(arc_second+Math.PI); ky=centerY-20*Math.cos(arc_second+Math.PI); context.lineTo(kx,ky); context.lineWidth = 2; context.strokeStyle = "gray"; context.stroke(); context.closePath();}/*extra.onmousedown=null;extra.onmouseup=null; extra.onmousemove=null;*/extra_canvas.onmousedown=canvasMouseDownHandler;extra_canvas.onmouseup=canvasMouseUpHandler; function canvasMouseDownHandler(event){ var canvasMouseX=event.screenX; var canvasMouseY=event.screenY; extra_canvas.onmousemove=canvasMouseMoveHandler; // console.log(down); startDragMouseX=canvasMouseX; startDragMouseY=canvasMouseY; startDragRectX=currentRectX; startDragRectY=currentRectY; } function canvasMouseMoveHandler(event){event.preventDefault();var canvasMouseX=event.screenX; var canvasMouseY=event.screenY; // console.log(move); currentRectX=startDragRectX+canvasMouseX-startDragMouseX; currentRectY=startDragRectY+canvasMouseY-startDragMouseY; //console.log(currentRectX,currentRectY); clock(); } function canvasMouseUpHandler(event){ extra_canvas.onmousemove=null; //console.log(up); }/* function cc(){ clock(null,0,0);}*///window.setInterval(cc, 200);init();window.setInterval(clock, 200);
