constructor(image, w, h) {
    super();

    this.image = this.setSpanValue(image);
    this.w = Util.initValue(w, 20);
    this.h = Util.initValue(h, this.w);
    this.name = "Body";
  }
Creates a new Body instance.
@param {string|object|Image|HTMLImageElement|ArraySpan} image - The image source or object to use for the particle body.
@param {number} [w=20] - The width of the particle body.
@param {number} [h] - The height of the particle body. Defaults to the width if not provided.