public static int pointInPolygon(Point a, Polygon p)
{
int parity = 0;
for (int i = 0; i < p.size(); i++, p.advance((int)Clock.CLOCKWISE))
{
Edge e = p.edge();
int result = edgeType(a, e);
if (result == (int)EdgePozition.TOUCHING)
return (int)PointToFigurePozition.BOUNDARY;
if (result == (int)EdgePozition.CROSSING)
parity = 1 - parity;
}
return ((parity != 0) ? (int)PointToFigurePozition.INSIDE : (int)PointToFigurePozition.OUTSIDE);
}
public void TestMethodX()
{
Vertex s = new Vertex(4, -7);
s.insert(new Vertex(4, 0));
s.insert(new Vertex(9, 0));
s.insert(new Vertex(9, -2));
s.insert(new Vertex(16, -2));
s.insert(new Vertex(16, 0));
s.insert(new Vertex(21, 0));
s.insert(new Vertex(21, -7));
s.insert(new Vertex(16, -7));
s.insert(new Vertex(16, -5));
s.insert(new Vertex(9, -5));
s.insert(new Vertex(9, -7));
Polygon pol = new Polygon(s);
Point p1 = new Point(17, 1);
Point p2 = new Point(5, -10);
Point p3 = new Point(9, -5);
Point p4 = new Point(10, -4);
int result = _Polygon.Action.pointInPolygon(p1, pol);
Assert.AreEqual(result, (int)PointToFigurePozition.OUTSIDE);
int result1 = _Polygon.Action.pointInPolygon(p2, pol);
Assert.AreEqual(result1, (int)PointToFigurePozition.OUTSIDE);
int result2 = _Polygon.Action.pointInPolygon(p3, pol);
Assert.AreEqual(result2, (int)PointToFigurePozition.BOUNDARY);
int result3 = _Polygon.Action.pointInPolygon(p4, pol);
Assert.AreEqual(result3, (int)PointToFigurePozition.INSIDE);
}
static void Main(string[] args)
{
int n;
Console.Write("Число вершин многоугольника = ");
n = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Введите {0} Точек", n);
int a, b;
Console.WriteLine("Точка 1 ");
Console.Write(" X = ");
a = Convert.ToInt32(Console.ReadLine());
Console.Write(" Y = ");
b = Convert.ToInt32(Console.ReadLine());
Vertex s = new Vertex(a, b); // заводим вершину и все другие будем добавлять к текущей.
for (int i = 2; i <= n; i++)
{
Console.WriteLine("Точка {0} ", i);
Console.Write(" X = ");
a = Convert.ToInt32(Console.ReadLine());
Console.Write(" Y = ");
b = Convert.ToInt32(Console.ReadLine());
s.insert(new Vertex(a, b)); // новые вершины добавляем к текущей
}
Polygon d = new Polygon(s);
char stop = 'n';
do
{
Console.WriteLine("Введите точку для проверки принадлежности многоугольнику");
int x, y;
Console.Write(" X = ");
x = Convert.ToInt32(Console.ReadLine());
Console.Write(" Y = ");
y = Convert.ToInt32(Console.ReadLine());
Console.Write(" Точка лежит : ");
Point z = new Point(x, y);
int result = Action.pointInPolygon(z, d);
switch (result)
{
case (int)PointToFigurePozition.INSIDE: Console.WriteLine("Внутри многоугольника");
break;
case (int)PointToFigurePozition.OUTSIDE: Console.WriteLine("Вне многоугольника");
break;
case (int)PointToFigurePozition.BOUNDARY: Console.WriteLine("На границе многоугольника");
break;
}
Console.WriteLine("Остановиться? (y/n)");
stop = Convert.ToChar(Console.ReadLine());
} while (stop == 'n' || stop == 'N');
Console.ReadKey();
}
public Polygon(Polygon p)
{
_size = p._size;
if (_size == 0)
_v = null;
else
{
_v = new Vertex(p.point());
for (int i = 1; i < _size; i++)
{
p.advance((int)Clock.CLOCKWISE);
_v = _v.insert(new Vertex(p.point()));
}
p.advance((int)Clock.CLOCKWISE);
_v = _v.cw();
}
}