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                            ## 平移

~~~
ctx.translate(0,100);
ctx.moveTo(0,0);
ctx.lineTo(100,100);
ctx.stroke();
~~~

> translate(x，y)平移的是坐標系的原點。beiginPath不會清空坐標系原點的變換


## 旋轉
~~~
ctx.rotate(Math.PI/ 4);
ctx.moveTo(0,0);
ctx.lineTo(100,100);
ctx.strokeStyle = "#F00";
ctx.lineWidth = 5;
ctx.stroke();
~~~

![旋轉之前](images/15279068891.png)              
![旋轉之后](images/15279069321.jpg)

> rotate(旋轉角度)坐標系旋轉角度

## 縮放
~~~
ctx.translate(0, 100);
ctx.rotate(Math.PI / 4);
ctx.scale(1, 0.5);
ctx.fillRect(0,-100,100,100);
~~~

> scale(x軸縮放比例，y軸縮放比例)
> 圖形變換效果是會疊加的**************************************
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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