How to draw a circle with a dotted line?

Happier

In the processing language, how to draw a circle and lines with a dotted line? Can it be achieved? like this? :)

kfrajer

Demo below. Typically, you provide your attempt or you describe what part you are struggling.

Kf

final float N=100;
float da=TWO_PI/N;
float rad=100;
PVector centroid =new PVector(width/2,height/2);

size(400,500);

fill(255,0,0);
for(float a=0;a<TWO_PI;a+=da){
  ellipse(centroid.x+rad*cos(a),centroid.x+rad*sin(a),5,5);
}

Happier

Is there any other way? For example, set a function to make straight lines at intervals every other period?

Chrisir

You can write your own function

Based on the code above

N is the number of steps

jeremydouglass

If you want a library for dashed lines on a wide variety of shapes, try Dashed Lines for Processing:

• https://github.com/garciadelcastillo/-dashed-lines-for-processing-

For lines, the Processing reference also has an example of using lerp to draw dotted lines.

• https://processing.org/reference/lerp_.html
• https://forum.processing.org/two/discussion/16338/lerp-and-dotted-lines

This method can be used radially as well for r rather than x,y.