boundary.js

// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com

// A fixed boundary class

// A boundary is a simple rectangle with x,y,width,and height
class Boundary
{
    constructor(x, y, w, h) {
      this.x = x;
      this.y = y;
      this.w = w;
      this.h = h;
  
      let fd = new box2d.b2FixtureDef();
      fd.density = 1.0;
      fd.friction = 0.5;
      fd.restitution = 0.2;
  
      let bd = new box2d.b2BodyDef();
  
      bd.type = box2d.b2BodyType.b2_staticBody;
      bd.position.x = scaleToWorld(this.x);
      bd.position.y = scaleToWorld(this.y);
      fd.shape = new box2d.b2PolygonShape();
      fd.shape.SetAsBox(this.w / (scaleFactor * 2), this.h / (scaleFactor * 2));
      this.body = world.CreateBody(bd).CreateFixture(fd);
    }
  
    // Draw the boundary, if it were at an angle we'd have to do something fancier
    display() {
      fill(127);
      stroke(0);
      rectMode(CENTER);
      rect(this.x, this.y, this.w, this.h);
    }
  }