private bool CanRotate(double angle)
{
double cos = Math.Cos(angle);
double sin = Math.Sin(angle);
return(CanChangePosition(p => FiguresUtils.RotatePoint(p - Center, cos, sin) + Center));
}
public Triangle(Point point1, Point point2, Point point3, bool contourOnly = false) : base(contourOnly, point1, point2, point3)
{
if (FiguresUtils.OnSameLines(point1, point2, point3))
{
throw new ArgumentException("Points can't be on the same straight line.");
}
}
public override List <Point> GetСontoursPoints()
{
IEnumerable <Point> result = new List <Point>();
for (int i = 0, j = _definingPoints.Count - 1; i < _definingPoints.Count; j = i++)
{
result = result.Concat(FiguresUtils.CalculatePointsInLineWithoutEnd(_definingPoints[i], _definingPoints[j]));
}
return(result.ToList());
}
public override double GetContoursLength()
{
double result = 0;
for (int i = 0, j = _definingPoints.Count - 1; i < _definingPoints.Count; j = i++)
{
result += FiguresUtils.CalculateLineLength(_definingPoints[i], _definingPoints[j]);
}
return(result);
}
public virtual void RotateAroundOf(Point rotationsCenter, double angle)
{
double cos = Math.Cos(angle);
double sin = Math.Sin(angle);
for (int i = 0; i < _definingPoints.Count; i++)
{
_definingPoints[i] = FiguresUtils.RotatePoint(_definingPoints[i] - rotationsCenter, cos, sin) + rotationsCenter;
}
OnUpdate();
}
