constructor(x1, y1, x2, y2) {

    this.p1 = createVector(x1, y1);

    this.p2 = createVector(x2, y2);

  }

​

  show() {

    line(this.p1.x, this.p1.y, this.p2.x, this.p2.y);

  }

}

​

class Curve {

  constructor(points,segRate) {

    this.points = [];

    this.lines = [];

    for (let i = 0; i < points.length; i++) {

      this.points.push(points[i]);

    }

    this.makeCurve();

    this.subdiv(8,segRate);

  }

​

​

  makeCurve() {

    for (let i = 0; i < this.points.length-1; i++) {

      let start = this.points[i];

      let end = this.points[i + 1];

      this.lines.push(new LineSeg(start.x, start.y, end.x, end.y))

    }

  }

​

  subdiv(n, segRate) {

    while (n > 0) {

      this.chopLines(segRate);

      let newCurve = [];

      for (let i = 0; i < this.lines.length - 1; i++) {

        newCurve.push(this.lines[i]);

        let start = this.lines[i].p2;

        let end = this.lines[i + 1].p1;

        newCurve.push(new LineSeg(start.x, start.y, end.x, end.y));

      }

      newCurve.push(this.lines.pop());

      this.lines = newCurve;

      n--;

    }

  }

​

  chopLines(segRate) {

    for (let i = 0; i < this.lines.length; i++) {

      let x1 = this.lines[i].p1.x + segRate * (this.lines[i].p2.x - this.lines[i].p1.x);

      let y1 = this.lines[i].p1.y + segRate * (this.lines[i].p2.y - this.lines[i].p1.y);

      let x2 = this.lines[i].p1.x + (1 - segRate) * (this.lines[i].p2.x - this.lines[i].p1.x);

      let y2 = this.lines[i].p1.y + (1 - segRate) * (this.lines[i].p2.y - this.lines[i].p1.y);

​

      let newLine = new LineSeg(x1, y1, x2, y2);

      this.lines[i] = newLine;

    }

  }

​

  show() {

    for (let i = 0; i < this.lines.length; i++) {

      this.lines[i].show();

    }

  }

}