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# 1. CanvasItem之draw和update # 1. CanvasItem之draw和update
![Image text](image/canvas1.png) - Canvas是画布的意思，所以CanvasItem代表了就是可以被绘制节点，可以设置可视化界面和材质的颜色
![Image text](image/canvas2.png) ![Image text](image/canvas1.png)
![Image text](image/canvas3.png)
![Image text](image/canvas4.png)
![Image text](image/canvas5.png) - 所有的2D节点和GUI节点都继承于CanvasItem节点
![Image text](image/canvas6.png) ![Image text](image/canvas2.png)
![Image text](image/canvas7.png)
- CanvasItem是按树的树的广度优先遍历顺序绘制的
![Image text](image/canvas3.png)
- draw指定了要绘制的东西
![Image text](image/canvas4.png)
- 当要draw绘制的改变了，需要调用update
![Image text](image/canvas5.png)
- hide和show，隐藏和现实节点
![Image text](image/canvas6.png)
- CanvasItem可以绘制直线，正方形，长方形，圆，图片
![Image text](image/canvas7.png)