code: private Shape createCheckMark(int x, int y, int size) {
          int markSize = (int) (size * SIZE_MULTIPLIER + 0.5);
          int markX    = x + (int) (size * X_MULTIPLIER + 0.5);
          int markY    = y + (int) (size * Y_MULTIPLIER + 0.5);
  
          return shapeGenerator.createCheckMark(markX, markY, markSize, markSize);
      }
docs: Create the check mark shape.
  
  @param  x    the x coordinate of the upper-left corner of the check mark.
  @param  y    the y coordinate of the upper-left corner of the check mark.
  @param  size the check mark size in pixels.
  
  @return the check mark shape.