public object Clone()
{
Polygon result = new Polygon();
foreach (Point p in points)
{
result.AddPoint(p.x, p.y);
}
return(result);
}
void OnPressPixelPolygon(int x, int y)
{
if (isEntering)
{
Shell.Instance.SetPixel(x, y);
pol.AddPoint(x, y);
TBPointsCount.Text = "PointsCount - " + pol.Length.ToString();
if (pol.Length > 2)
{
BTNStroke.IsEnabled = true;
BTNFillEO.IsEnabled = true;
BTNFillNZW.IsEnabled = true;
TBType.Text = "Type: " + (!pol.IsSimple ? "complicated" : ("simple, " +
(pol.IsConvex ? "convex" : "nonconvex")));
}
}
}
public static List <Polygon> ClipWA(Polygon p1, Polygon p2)
{
//учитваем движение по часовой стрелке
if (!p1.IsClockWise)
{
p1.ReOrient();
}
if (!p2.IsClockWise)
{
p2.ReOrient();
}
if (p1.IsInside(p2))
{
return new List <Polygon>()
{
p2
}
}
;
if (p2.IsInside(p1))
{
return new List <Polygon>()
{
p1
}
}
;
//собираем 2 массива точек
List <Point> S = GetWAPoints(p1, p2);
List <Point> C = GetWAPoints(p2, p1);
List <Polygon> result = new List <Polygon>();
while (true)
{
//ищем общую точку
Point p = Utils.FindCommonElement <Point>(S, C);
if (p == null)
{
break;
}
bool isFirst = StartWAWithFirst(p1.points, p2.points, p);
Polygon polygon = new Polygon();
List <Point> completed = new List <Point>();
completed.Add(p);
do
{
polygon.AddPoint(p);
if (isFirst)
{
p = S[(S.IndexOf(p) + 1) % S.Count()];
}
else
{
p = C[(C.IndexOf(p) + 1) % C.Count()];
}
if (S.Any(point => point.Equals(p)) &&
C.Any(point => point.Equals(p)))
{
isFirst = !isFirst;
completed.Add(p);
}
}while (!p.Equals(polygon.points[0]));
result.Add(polygon);
foreach (Point po in completed)
{
S.Remove(S.FirstOrDefault(poi => poi.Equals(po)));
C.Remove(C.FirstOrDefault(poi => poi.Equals(po)));
}
}
return(result);
}
/// <summary>
/// нарисовать линию
/// </summary>
/// <param name="w">толщина</param>
/// <param name="color">цвет</param>
/// <param name="type">тип законцовки</param>
public static void DrawLine(this Shell shell, int x1, int y1, int x2, int y2, int w, Color color,
LineCap type = LineCap.FLAP)
{
int x1old = x1, x2old = x2, y1old = y1, y2old = y2;
if (w < 3)
{
shell.DrawLine(x1, y1, x2, y2, color);
return;
}
double alpha = Math.Atan(((double)(x2 - x1)) / ((double)(y2 - y1)));
if (y1 <= y2)
{
Utils.Swap(ref x1, ref x2);
Utils.Swap(ref y1, ref y2);
}
if (type == LineCap.SQUARE)
{
x1 += (int)(w * Math.Sin(alpha) / 2);
y1 += (int)(w * Math.Cos(alpha) / 2);
x2 -= (int)(w * Math.Sin(alpha) / 2);
y2 -= (int)(w * Math.Cos(alpha) / 2);
}
Polygon pol = new Polygon();
double dx = w * Math.Cos(alpha) / 2;
double dy = w * Math.Sin(alpha) / 2;
// pol.AddPoint(x1 - (int)dx, y1 + (int)dy);
if (type == LineCap.ROUND)
{
int n = w / 2;
if (n < 5)
{
n = 5;
}
double al = alpha;
for (int i = 0; i < n; i++)
{
al += Math.PI / n;
pol.AddPoint(x1 - (int)(w * Math.Cos(al) / 2), y1 + (int)(w * Math.Sin(al) / 2));
}
for (int i = 0; i < n; i++)
{
pol.AddPoint(x2 - (int)(w * Math.Cos(al) / 2), y2 + (int)(w * Math.Sin(al) / 2));
al += Math.PI / n;
}
}
else
{
pol.AddPoint(x1 - (int)dx, y1 + (int)dy);
pol.AddPoint(x1 + (int)dx, y1 - (int)dy);
pol.AddPoint(x2 + (int)dx, y2 - (int)dy);
pol.AddPoint(x2 - (int)dx, y2 + (int)dy);
}
shell.FillPolygon(pol, color);
//shell.DrawLine(x1old, y1old, x2old, y2old, Colors.Red);
}