private double _lineLeght(PointT a, PointT b) //подсчет длины отрезка ab
{
float x = a.X - b.X;
float y = a.Y - b.Y;
return(Math.Sqrt(x * x + y * y));
}
static void Main(string[] args)
{
Console.WriteLine("Введите количество вершин многоугольника");
var count = Convert.ToInt32(Console.ReadLine());
var poligonT = new PointT[count];
for (var i = 0; i < count; i++)
{
Console.WriteLine("X" + i + ":");
var x = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Y" + i + ":");
var y = Convert.ToInt32(Console.ReadLine());
var point = new PointT(x, y);
poligonT[i] = point;
}
var poligon = new Polygon(poligonT);
Console.WriteLine("Площадь: ");
Console.WriteLine(poligon.GetArea());
Console.ReadLine();
}
private PointT?_getIntersectionPoint(PointT l1P1, PointT l1P2, PointT l2P1, PointT l2P2)
{
var a1 = l1P2.Y - l1P1.Y;
var b1 = l1P1.X - l1P2.X;
var c1 = a1 * l1P1.X + b1 * l1P1.Y;
var a2 = l2P2.Y - l2P1.Y;
var b2 = l2P1.X - l2P2.X;
var c2 = a2 * l2P1.X + b2 * l2P1.Y;
var det = a1 * b2 - a2 * b1;
var x = (b2 * c1 - b1 * c2) / det;
var y = (a1 * c2 - a2 * c1) / det;
var online1 = (Math.Min(l1P1.X, l1P2.X) < x || Math.Min(l1P1.X, l1P2.X) == x) &&
(Math.Max(l1P1.X, l1P2.X) > x || Math.Max(l1P1.X, l1P2.X) == x) &&
(Math.Min(l1P1.Y, l1P2.Y) < y || Math.Min(l1P1.Y, l1P2.Y) == y) &&
(Math.Max(l1P1.Y, l1P2.Y) > y || Math.Max(l1P1.Y, l1P2.Y) == y);
var online2 = ((Math.Min(l2P1.X, l2P2.X) < x || Math.Min(l2P1.X, l2P2.X) == x)) &&
(Math.Max(l2P1.X, l2P2.X) > x || Math.Max(l2P1.X, l2P2.X) == x) &&
(Math.Min(l2P1.Y, l2P2.Y) < y || Math.Min(l2P1.Y, l2P2.Y) == y) &&
(Math.Max(l2P1.Y, l2P2.Y) > y || Math.Max(l2P1.Y, l2P2.Y) == y);
if (online1 && online2)
{
return(new PointT(x, y));
}
return(null);
}
private bool _isPointInside(PointT a, PointT b, PointT c, PointT p) //находится ли точка p внутри треугольника abc
{
float ab = (a.X - p.X) * (b.Y - a.Y) - (b.X - a.X) * (a.Y - p.Y);
float bc = (b.X - p.X) * (c.Y - b.Y) - (c.X - b.X) * (b.Y - p.Y);
float ca = (c.X - p.X) * (a.Y - c.Y) - (a.X - c.X) * (c.Y - p.Y);
return((ab >= 0 && bc >= 0 && ca >= 0) || (ab <= 0 && bc <= 0 && ca <= 0));
}
private bool _pointInsertPoligon(IEnumerable <Triangle> triangles, PointT pt)
{
foreach (var triangle in triangles)
{
if (_isPointInside(triangle.getA(), triangle.getB(), triangle.getC(), pt))
{
return(true);
}
}
return(false);
}
public Triangle(PointT a, PointT b, PointT c)
{
this.a = a;
this.b = b;
this.c = c;
}