HTML5canvas基本绘图之填充样式实现

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

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

 

 //线性渐变 

 var grd = context.createLinearGradient( 10 , 10, 100 , 350 ); 

 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.fillRect(10,10,100,350); 

 

 //径向渐变 

 var grd = context.createRadialGradient(325 , 200, 0 , 325 , 200 , 200 ); 

 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.fillRect(150,10,350,350); 

 

 //位图填充 

 var bgimg = new Image(); 

 bgimg.src = "background.jpg"; 

 bgimg.onload=function(){ 

 var pattern = context.createPattern(bgimg, "repeat"); 

 context.fillStyle = pattern; 

 context.strokeStyle="#F20B0B"; 

 context.fillRect(600, 100, 200,200); 

 context.strokeRect(600, 100, 200,200); 

 };