External Bounding Box has incorrect Y value

[tazdevil78]

Height of a pointy top hex of radius is 2*138 = 276. When the centerY of a hex is 138 the y value of the bounding box should be zero. This is not the value returned by getExternalBoundingBox() .

``
@test
public void yValue() {
HexagonalGridBuilder builder = new HexagonalGridBuilder()
.setGridHeight(3)
.setGridWidth(3)
.setGridLayout(HexagonalGridLayout.HEXAGONAL)
.setOrientation(HexagonOrientation.POINTY_TOP)
.setRadius(138);
HexagonalGrid grid = builder.build();
Hexagon hex = (Hexagon) grid.getHexagons().iterator().next();
Rectangle rect = hex.getExternalBoundingBox();
double ctrY = hex.getCenterY(); // 138
double ht = 2*138;
assertEquals(ctrY - ht/2, rect.getY(), 0.01f); // expected 0, actual 207
}

[tazdevil78]

In the pointy orientation, a hexagon has width w = sqrt(3) * size and height h = 2 * size.
https://www.redblobgames.com/grids/hexagons/#size-and-spacing