public static void Rotate(ref int x, ref int y, int xr, int yr, double angle)
{
int x1 = DEFINE.Round(xr + (x - xr) * Math.Cos(angle) - (y - yr) * Math.Sin(angle));
int y1 = DEFINE.Round(yr + (x - xr) * Math.Sin(angle) + (y - yr) * Math.Cos(angle));
x = x1;
y = y1;
}
public static void Rotate <T>(ref T target, Expression <Func <T, int> > x, Expression <Func <T, int> > y, int xr, int yr, double angle)
{
Object t = target;
var exprX = (MemberExpression)x.Body;
var propX = (PropertyInfo)exprX.Member;
var exprY = (MemberExpression)y.Body;
var propY = (PropertyInfo)exprY.Member;
int X = Convert.ToInt32(propX.GetValue(target));
int Y = Convert.ToInt32(propY.GetValue(target));
int x1 = DEFINE.Round(xr + (X - xr) * Math.Cos(angle) - (Y - yr) * Math.Sin(angle));
int y1 = DEFINE.Round(yr + (X - xr) * Math.Sin(angle) + (Y - yr) * Math.Cos(angle));
//int x1 = (int)(xr + (X - xr) * Math.Cos(angle) - (Y - yr) * Math.Sin(angle));
//int y1 = (int)(yr + (X - xr) * Math.Sin(angle) + (Y - yr) * Math.Cos(angle));
propX.SetValue(t, x1);
propY.SetValue(t, y1);
target = (T)t;
}