// Daniel Shiffman

// http://natureofcode.com

​

// A rectangular boundary

​

class Surface {

  constructor() {

    this.surface = [];

    // Here we keep track of the screen coordinates of the chain

    this.surface.push(Vector.create(0, height / 2));

    //this.surface.push(Vector.create(width / 2, height / 2));

    this.surface.push(Vector.create(width, height / 2));

    this.surface.push(Vector.create(width, height));

    this.surface.push(Vector.create(0, height));

​

    this.center = Vector.create(0, 0);

​

    for (let v of this.surface) {

      this.center.x += v.x;

      this.center.y += v.y;

    }

    this.center.x /= this.surface.length;

    this.center.y /= this.surface.length;

​

    this.body = Bodies.fromVertices(

      this.center.x,

      this.center.y,

      this.surface,

      {

        isStatic: true,

      }

    );

    console.log(this.body);

    Composite.add(engine.world, this.body);

  }

​

  // A simple function to just draw the edge chain as a series of vertex points

  show() {

    let vertices = this.surface;

    //let vertices = this.body.vertices;

    fill(255);

    fill(0);

    beginShape();

    for (let v of  vertices) {

      vertex(v.x, v.y);

    }

    endShape();

  }

}

​