public static Integer findDockSide( int x0, int y0, int dx, int dy, double docX, double docY, Vector mousePos) { if (GeometryHelper.containsInRectangle( Vector.valueOf(x0 + docX, y0 + docY), Vector.valueOf(dx - 2 * docX, dy - 2 * docY), mousePos)) return Side.CENTER; else if (GeometryHelper.containsInRectangle( Vector.valueOf(x0 + docX, y0 + dy - docY), Vector.valueOf(dx - 2 * docX, docY), mousePos) || GeometryHelper.containsInRightTriangle( Vector.valueOf(x0 + docX, y0 + dy), -docX, -docY, mousePos) || GeometryHelper.containsInRightTriangle( Vector.valueOf(x0 + dx - docX, y0 + dy), docX, -docY, mousePos)) { return Side.BOTTOM; } else if (GeometryHelper.containsInRectangle( Vector.valueOf(x0, y0 + docY), new Vector(docX, dy - 2 * docY), mousePos) || GeometryHelper.containsInRightTriangle( Vector.valueOf(x0, y0 + docY), docX, -docY, mousePos) || GeometryHelper.containsInRightTriangle( Vector.valueOf(x0, y0 + dy - docY), docX, docY, mousePos)) { return Side.LEFT; } else if (GeometryHelper.containsInRectangle( Vector.valueOf(x0 + dx - docX, y0 + docY), new Vector(docX, dy - 2 * docY), mousePos) || GeometryHelper.containsInRightTriangle( Vector.valueOf(x0 + dx, y0 + docY), -docX, -docY, mousePos) || GeometryHelper.containsInRightTriangle( Vector.valueOf(x0 + dx, y0 + dy - docY), -docX, docY, mousePos)) { return Side.RIGHT; } else if (GeometryHelper.containsInRectangle( Vector.valueOf(x0 + docX, y0), new Vector(dy - 2 * docY, docY), mousePos) || GeometryHelper.containsInRightTriangle( Vector.valueOf(x0 + docX, y0), -docX, docY, mousePos) || GeometryHelper.containsInRightTriangle( Vector.valueOf(x0 + dx - docX, y0), docX, docY, mousePos)) { return Side.TOP; } else return null; }