import megamu.shapetween.*;

CircularShaper circle;

void setup(){
  circle = new CircularShaper();
  circle.throughPoint( 0.7, 0.3 );
}

void draw(){
  background(255);
  
  beginShape();
  for( float i=0; i<=1; i+= 0.05 )
    vertex( i*width, circle.shape( i )*height );
  endShape();
}

x

The point to pass through in the x dimension

y

The point to pass through in the f(x) dimension