HTML5canvas基本绘图之文字渲染

var canvas = document.getElementById("canvas"); 

 var context = canvas.getContext("2d"); 

 

 context.font="bold 30px Arial"; //设置样式 

 context.strokeStyle = "#1712F4"; 

 context.strokeText("欢迎来到我的博客！",30,100); 

 

 context.font="bold 50px Arial"; 

 var grd = context.createLinearGradient( 30 , 200, 400 , 300 );//设置渐变填充样式 

 grd.addColorStop(0,"#1EF9F7"); 

 grd.addColorStop(0.25,"#FC0F31"); 

 grd.addColorStop(0.5,"#ECF811"); 

 grd.addColorStop(0.75,"#2F0AF1"); 

 grd.addColorStop(1,"#160303"); 

 context.fillStyle = grd; 

 context.fillText("欢迎来到我的博客！",30,200); 

 

 context.save(); 

 context.moveTo(200,280); 

 context.lineTo(200,420); 

 context.stroke(); 

 context.font="bold 20px Arial"; 

 context.fillStyle = "#F80707"; 

 context.textAlign="left"; 

 context.fillText("文本在指定的位置开始",200,300); 

 context.textAlign="center"; 

 context.fillText("文本的中心被放置在指定的位置",200,350); 

 context.textAlign="right"; 

 context.fillText("文本在指定的位置结束",200,400); 

 context.restore(); 

 

 context.save(); 

 context.moveTo(10,500); 

 context.lineTo(500,500); 

 context.stroke(); 

 context.fillStyle="#F60D0D"; 

 context.font="bold 20px Arial"; 

 context.textBaseline="top"; 

 context.fillText("指定位置在上面",10,500); 

 context.textBaseline="bottom"; 

 context.fillText("指定位置在下面",150,500); 

 context.textBaseline="middle"; 

 context.fillText("指定位置居中",300,500); 

 context.restore(); 

 

 

 context.font="bold 40px Arial"; 

 context.strokeStyle = "#16F643"; 

 var text = "欢迎来到我的博客！"; 

 context.strokeText("欢迎来到我的博客！",10,600); 

 context.strokeText("上面字符串的宽度为："+context.measureText(text).width,10,650);