public static Point Rotate(this Point point, double angle)
{
if (Math.Sign(angle) == 0)
{
return(new Point(point.X, point.Y));
}
var cos = Math.Cos(angle);
var sin = Math.Sin(angle);
return(new Point(point.X * cos - point.Y * sin,
point.X * sin + point.Y * cos));
}
public static Point Perpendicular(this Point lhs)
{
return(new Point(-lhs.Y, lhs.X));
}
public static Point Negative(this Point lhs)
{
return(new Point(-lhs.X, -lhs.Y));
}
public static void Negate(this Point lhs)
{
lhs.X = -lhs.X;
lhs.Y = -lhs.Y;
}
public static double Dot(this Point lhs, Point rhs)
{
return(lhs.X * rhs.X + lhs.Y * rhs.Y);
}
public static double Dot(this Vertex vertex, Point point)
{
return((vertex.X * point.X) + (vertex.Y * point.Y));
}
public static bool IsZero(this Point point)
{
return(Math.Sign(point.X) == 0 && Math.Sign(point.Y) == 0);
}
public static Point Sub(this Vertex vertex, Point point)
{
return(new Point(vertex.X - point.X, vertex.Y - point.Y));
}
public static Point Add(this Vertex vertex, Point point)
{
return(new Point(vertex.X + point.X, vertex.Y + point.Y));
}
public static double Cross(this Point point, Point point2)
{
return((point.X * point2.Y) - (point.Y * point2.X));
}
public BodyRenderStruct(Body body)
{
Fill = body.Static ? Color.FromArgb(0xee, 0xee, 0xee) : RandomColor.Random();
Stroke = ShadeColor(Fill, -20);
Sprite = (body.Bounds.Min - body.Position) / (body.Bounds.Max - body.Bounds.Min);
}