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                            ## Cavans剪輯區域

~~~
//保存環境
cts.save();
ctx.arc(300,100,200,0,Math.PI *2,true);
//進行區域剪輯
ctx.clip();
ctx.fillStyle = "#F00";
ctx.fillRect(100,100,200,200);

//恢復環境，釋放了剪輯區域的作用
ctx.restore();

ctx.beginPath();
ctx.arc(400,300,100,0,Math.PI * 2,true);
ctx.fillStyle = "#00F";
ctx.fill();
~~~

> 使用clip()之后，后面繪制的所有東西都只能在設置的區域之內。
> 解決辦法：在上述代碼開頭處調用save()，剪輯結束處調用restore()
> save()保存環境
> restore()恢復環境


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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