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<>在MATLAB中快速画圆（给出圆心坐标和半径就能直接画的那种）
<>用rectangle函数
我们将使用matlab的rectangle，来画圆。
<>简单看看官方文档
rectangle('Position',pos,'Curvature',cur) 为矩形的边添加曲率。要沿水平边和垂直边使用不同的曲率，请将 cur 指定为
[horizontal vertical] 形式的二元素向量。要沿所有边使用相同的曲率，请将 cur 指定为一个标量值。请将值指定为 0（无曲率）和
1（最大曲率）之间的值。使用[1 1] 创建一个椭圆形或圆形。
文档中还给出了一个实例，不过这个实例的pos参数不太直观，还达不到给出圆心坐标和半径就能画圆的目的。
下面就给出能够实现目的的代码，实际运用的时候分别给x y r 赋值即可。
x = 横坐标; y = 纵坐标; r = 半径;
rectangle('Position',[x-r,y-r,2*r,2*r],'Curvature',[1,1],'EdgeColor','m')
下图是画好多好多圆的一个示意图。
谢谢大家！
