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                            ## Canvas畫圓和矩形

### 圓
~~~
ctx.beginPath();
ctx.arc(200, 200, 50, 0, 2*Math.PI, true);
ctx.stroke();
~~~

> arc(圓心x坐標，圓形y坐標，半徑，起止弧度，終止弧度，順時針false/逆時針true)


### 矩形
畫矩形=畫四條直線

`ctx.strokeRect(300,100,200,100);`

> strokeRect(矩形左上角x坐標，矩形左上角y坐標，矩形寬，矩形高),是一個封裝函數，不需要先執行beginPath()，再執行stroke()


### closePath()
閉合線段

~~~
ctx.moveTo(0,0);
ctx.lineTo(100,100);
ctx.lineTo(100,200);
ctx.closePath();
ctx.strokeStyle = "red";
ctx.stroke();
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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