public override void Draw(Graphics e, int num)
{
int k = 50;
Point startPoint = MathHelper.MiddlePoint(to.Position, from.Position, Node.NODE_SIZE / 2);
Point endPoint = MathHelper.MiddlePoint(from.Position, to.Position, Node.NODE_SIZE / 2);
Pen pen = new Pen(State == State.Normal ? Color.Black : Color.Lime, 2);
Point temp = new Point((startPoint.X + endPoint.X) / 2, (startPoint.Y + endPoint.Y) / 2);
Point midPoint;
if (num % 2 == 0)
{
k = k * (num / 2);
Point x = new Point(startPoint.Y - temp.Y + temp.X, temp.X - startPoint.X + temp.Y);
midPoint = MathHelper.MiddlePoint(x, temp, k);
double angle = Math.Atan2(midPoint.Y - temp.Y, midPoint.X - temp.X) * 180.0 / Math.PI;
if (angle <= 0 || angle > 180.0)
{
x = new Point(temp.Y - startPoint.Y + temp.X, startPoint.X - temp.X + temp.Y);
midPoint = MathHelper.MiddlePoint(x, temp, k);
}
}
else
{
k = k * ((num + 1) / 2);
Point x = new Point(startPoint.Y - temp.Y + temp.X, temp.X - startPoint.X + temp.Y);
midPoint = MathHelper.MiddlePoint(x, temp, k);
double angle = Math.Atan2(midPoint.Y - temp.Y, midPoint.X - temp.X) * 180.0 / Math.PI;
if (angle > 0 && angle <= 180.0)
{
x = new Point(temp.Y - startPoint.Y + temp.X, startPoint.X - temp.X + temp.Y);
midPoint = MathHelper.MiddlePoint(x, temp, k);
}
}
if (Weight != 0)
{
StringFormat sf = new StringFormat();
sf.LineAlignment = StringAlignment.Center;
sf.Alignment = StringAlignment.Center;
Font f = new Font("Consolas", FONT_SIZE, FontStyle.Regular);
e.DrawString(Weight.ToString(), f, State == State.Normal ? Brushes.Black : Brushes.Lime, midPoint, sf);
SizeF size = e.MeasureString(Weight.ToString(), f);
float r = Math.Max(size.Width, size.Height);
Point p1 = MathHelper.MiddlePoint(startPoint, midPoint, r);
Point p2 = MathHelper.MiddlePoint(endPoint, midPoint, r);
e.DrawLine(pen, startPoint, p1);
e.DrawLine(pen, p2, endPoint);
}
else
{
e.DrawLine(pen, startPoint, midPoint);
e.DrawLine(pen, midPoint, endPoint);
}
Point[] arrowPoints = MathHelper.ArrowPoints(midPoint, endPoint);
e.FillClosedCurve(State == State.Normal ? Brushes.Black : Brushes.Lime, arrowPoints);
MidPoint = midPoint;
}