private void DrawArrowTo(ICity city, Graphics g)
{
PointF p0 = new PointF(_x, _y);
PointF pEnd = new PointF(city.GetPositoin().X, city.GetPositoin().Y);
float X = pEnd.X - p0.X;
float Y = pEnd.Y - p0.Y;
double lineLength = Math.Sqrt(X * X + Y * Y);
double sin, cos;
cos = X / lineLength;
sin = Y / lineLength;
PointF endPoint = new PointF((float)(p0.X + (cos * (lineLength - _rad))),
(float)(p0.Y + (sin * (lineLength - _rad))));
PointF startPoint = new PointF((float)(p0.X + (cos * (_rad))),
(float)(p0.Y + (sin * (_rad))));
PointF arrowPoint = new PointF((float)(p0.X + (cos * (lineLength - _rad - 10))),
(float)(p0.Y + (sin * (lineLength - _rad - 10))));
PointF middlePoint = new PointF((float)(p0.X + (cos * (lineLength - lineLength / 2))),
(float)(p0.Y + (sin * (lineLength - lineLength / 2))));
float vectorX, vectorY;
if (X < 10 && X > -10)
{
vectorX = 1;
vectorY = -X / Y;
}
else
{
vectorX = -Y / X;
vectorY = 1;
}
int koef;
if (_id < city.Id)
{
koef = 1;
}
else
{
koef = -1;
}
PointF normVector = new PointF(vectorX, vectorY);
double NormLength = Math.Sqrt(normVector.X * normVector.X +
normVector.Y * normVector.Y);
double cosNorm = normVector.X / NormLength;
double sinNorm = normVector.Y / NormLength;
Pen linePen = new Pen(Color.Black, 2);
g.DrawLine(linePen, startPoint, endPoint);
if (koef > 0)
{
DrawWeightTo(_weights.GetInfo(city.Id), middlePoint, koef * sinNorm, koef * cosNorm, koef, g);
}
}
