function clearArcFun(x,y,r,cxt){ //(x,y)为要清除的圆的圆心,r为半径,cxt为context var stepClear=1;//别忘记这一步 clearArc(x,y,r); function clearArc(x,y,radius){ var calcWidth=radius-stepClear; var calcHeight=Math.sqrt(radius*radius-calcWidth*calcWidth); var posX=x-calcWi
代码: function createSeal(id,company,name){ var canvas = document.getElementById(id); var context = canvas.getContext('2d'); // 绘制印章边框 var width=canvas.width/2; var height=canvas.height/2; context.lineWidth=7; context.strokeStyle="#f00"; context.b
转载:https://developer.mozilla.org/zh-CN/docs/Web/API/Canvas_API/Tutorial/Drawing_shapes#圆弧 function draw() { var canvas = document.getElementById('canvas'); if (canvas.getContext){ var ctx = canvas.getContext('2d'); for(var i=0;i<4;i++){ for(var j=0;j
本文转自:http://www.cnblogs.com/dragondean/p/6013529.html 代码: function createSeal(id,company,name){ var canvas = document.getElementById(id); var context = canvas.getContext('2d'); // 绘制印章边框 var width=canvas.width/2; var height=canvas.height/2; context.l
window.onload=function(){ var loading=document.getElementById('loading'); var context=loading.getContext('2d'); var num=parseInt(Math.random()*100)/100;//模拟获取进度值 var temp=0;//当前进度值 var time=1000;//动画总时长 var step=1000*0.01/num;//动画步长 function loadanim
