private void LakeResizeControl_MouseMove(object sender, MouseEventArgs e)
{
if (_lake != null)
{
_mousePosition = new Point(e.X, e.Y);
if (_mouseDown && _selectedCorner.HasValue)
{
this.Invalidate();
}
else
{
double minDistance = 25.0;
CoordinatePoint a2 = new CoordinatePoint(new Coordinate(_lake.South), new Coordinate(_lake.East), 0);
CoordinatePoint b2 = new CoordinatePoint(new Coordinate(_lake.North), new Coordinate(_lake.West), 0);
Point tl = CoordinatesToScreen(b2);
Point br = CoordinatesToScreen(a2);
Point tr = new Point(br.X, tl.Y);
Point bl = new Point(tl.X, br.Y);
double tlDistance = CoordinatePoint.TwoDimensionalDistance(_mousePosition.X, _mousePosition.Y, tl.X, tl.Y);
double brDistance = CoordinatePoint.TwoDimensionalDistance(_mousePosition.X, _mousePosition.Y, br.X, br.Y);
double trDistance = CoordinatePoint.TwoDimensionalDistance(_mousePosition.X, _mousePosition.Y, tr.X, tr.Y);
double blDistance = CoordinatePoint.TwoDimensionalDistance(_mousePosition.X, _mousePosition.Y, bl.X, bl.Y);
if (tlDistance <= brDistance && tlDistance <= trDistance && tlDistance <= blDistance && tlDistance < minDistance)
{
_selectedCorner = SelectedCorner.TopLeft;
this.Cursor = Cursors.PanNW;
}
else if (brDistance <= tlDistance && brDistance <= trDistance && brDistance <= blDistance && brDistance < minDistance)
{
_selectedCorner = SelectedCorner.BottomRight;
this.Cursor = Cursors.PanSE;
}
else if (trDistance <= tlDistance && trDistance <= brDistance && trDistance <= blDistance && trDistance < minDistance)
{
_selectedCorner = SelectedCorner.TopRight;
this.Cursor = Cursors.PanNE;
}
else if (blDistance <= tlDistance && blDistance <= brDistance && blDistance <= trDistance && blDistance < minDistance)
{
_selectedCorner = SelectedCorner.BottomLeft;
this.Cursor = Cursors.PanSW;
}
else
{
_selectedCorner = null;
this.Cursor = Cursors.No;
}
}
}
}
