sealed protected override void SetEndLocation(Point end, Keys modifiers, Point location)
{
var start = Start;
var rect = new Rectangle();
var aspect = BGICanvas.ASPECT;
var size = Size.Abs(new Size(end - start));
if (modifiers.HasFlag(Keys.Shift))
{
IsSquare = true;
int diameter = Math.Max(size.Width, (int)Math.Round(size.Height / aspect));
if (modifiers.HasFlag(Keys.Alt))
{
IsCentered = true;
rect.Location = new Point(start - new Point(diameter, (int)Math.Round(diameter * aspect)));
diameter *= 2;
}
else
{
IsCentered = false;
rect.Location = new Point(
(end.X < start.X) ? start.X - diameter : start.X,
(end.Y < start.Y) ? start.Y - (int)Math.Round(diameter * aspect) : start.Y
);
}
rect.Size = new Size(
diameter + 1,
(int)Math.Round(diameter * aspect) + 1
);
}
else
{
IsSquare = false;
if (modifiers.HasFlag(Keys.Alt))
{
IsCentered = true;
rect.Location = start - size;
size *= new Size(2, 2);
rect.Size = size + 1;
}
else
{
IsCentered = false;
rect.Size = size + 1;
rect.Location = new Point(
(end.X < start.X) ? start.X - size.Width : start.X,
(end.Y < start.Y) ? start.Y - size.Height : start.Y
);
}
}
SetPosition(rect);
}
