code: void removePointForID(int id) {
          for (int i = 0; i < pointCount; i++) {
              if (points[i].id == id) {
                  if (i < pointCount - 1) {
                      System.arraycopy(points, i + 1, points, i, pointCount - i - 1);
                      points[pointCount - 1] = null;
                  }
                  pointCount --;
              }
          }
      }
docs: Removes the point with the given ID
  
  @param id The ID of the touch point which is to be removed.