Method areaIntercept

src/utils.ts:278–286

* Calculate the overlapping area between two grid positions. * * @param a first position * @param b second position * @returns the area of overlap (0 if no overlap) * * @example * const overlap = Utils.areaIntercept( * {x: 0, y: 0, w: 3, h: 2}, * {x: 1, y: 0, w: 3, h:

(a: GridStackPosition, b: GridStackPosition)

   * ); // returns 4 (2x2 overlap)
   */
  static areaIntercept(a: GridStackPosition, b: GridStackPosition): number {
    const x0 = (a.x > b.x) ? a.x : b.x;
    const x1 = (a.x+a.w < b.x+b.w) ? a.x+a.w : b.x+b.w;
    if (x1 <= x0) return 0; // no overlap
    const y0 = (a.y > b.y) ? a.y : b.y;
    const y1 = (a.y+a.h < b.y+b.h) ? a.y+a.h : b.y+b.h;
    if (y1 <= y0) return 0; // no overlap
    return (x1-x0) * (y1-y0);
  }

  /**
   * Calculate the total area of a grid position.