stay MATLAB Draw a circle quickly in （ Given the coordinates and radius of the center of the circle, you can draw it directly ）

use rectangle function

We will use matlab Of rectangle, To draw a circle .

Simply look at the official documents

rectangle('Position',pos,'Curvature',cur) Add curvature to the edges of the rectangle . To use different curvatures along horizontal and vertical edges , Please put cur Designated as [horizontal vertical] Two element vector of form . To use the same curvature along all edges , Please put cur Specify as a scalar value . Please specify the value as 0（ No curvature ） and 1（ Maximum curvature ） Between the value of the . Use [1 1] Create an ellipse or circle .

An example is also given in the document , But the of this example pos The parameters are not very intuitive , The radius and the center of the circle can not be drawn .

Here is the code that can achieve the purpose , In practical application, give them respectively x y r Assignment can .

x =  Abscissa ;
y =  Ordinate ;
r =  radius ;
rectangle('Position',[x-r,y-r,2*r,2*r],'Curvature',[1,1],'EdgeColor','m')

The following figure is a schematic diagram of drawing many circles .

Thank you. ！