How to manipulate the size of the ellipse when it is located toward the center of the screen?

[Chrisir]

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How to make the ellipse size change when the ellipse locates toward the center??

You can calculate the distance to the center with float d=dist(x,y,width/2,height/2); and then use map() command float diam = map(d,0,width,1,55); use diam as 3rd and 4th parameters for ellipse