public override void BeforeRender()
{
PointD vec = new PointD(EndPoint.X - StartPoint.X, EndPoint.Y - StartPoint.Y);
double mag = vec.Magnitude();
if (EndPoint.X == StartPoint.X)
{
this.dtdx = 0;
}
else
{
this.dtdx = vec.X / (mag * mag);
}
if (EndPoint.Y == StartPoint.Y)
{
this.dtdy = 0;
}
else
{
this.dtdy = vec.Y / (mag * mag);
}
base.BeforeRender();
}
public override void BeforeRender ()
{
var vec = new PointD (EndPoint.X - StartPoint.X, EndPoint.Y - StartPoint.Y);
double mag = vec.Magnitude ();
if (EndPoint.X == StartPoint.X)
dtdx = 0;
else
dtdx = vec.X / (mag * mag);
if (EndPoint.Y == StartPoint.Y)
dtdy = 0;
else
dtdy = vec.Y / (mag * mag);
base.BeforeRender ();
}