static bool PolygonCollision(PolygonForCollision polygonA, PolygonForCollision polygonB)
{
bool Intersect = true;
int edgeCountA = polygonA.Edges.Count;
int edgeCountB = polygonB.Edges.Count;
VectorForCollision edge;
for (int edgeIndex = 0; edgeIndex < edgeCountA + edgeCountB; edgeIndex++)
{
if (edgeIndex < edgeCountA)
{
edge = polygonA.Edges[edgeIndex];
}
else
{
edge = polygonB.Edges[edgeIndex - edgeCountA];
}
VectorForCollision axis = new VectorForCollision(-edge.Y, edge.X);
axis.Normalize();
float minA = 0; float minB = 0; float maxA = 0; float maxB = 0;
ProjectPolygon(axis, polygonA, ref minA, ref maxA);
ProjectPolygon(axis, polygonB, ref minB, ref maxB);
if (IntervalDistance(minA, maxA, minB, maxB) > 0)
{
Intersect = false;
}
}
return(Intersect);
}
public void Offset(float x, float y)
{
for (int i = 0; i < points.Count; i++)
{
VectorForCollision p = points[i];
points[i] = new VectorForCollision(p.X + x, p.Y + y);
}
}
static void ProjectPolygon(VectorForCollision axis, PolygonForCollision polygon, ref float min, ref float max)
{
float d = axis.DotProduct(polygon.Points[0]);
min = d;
max = d;
for (int i = 0; i < polygon.Points.Count; i++)
{
d = polygon.Points[i].DotProduct(axis);
if (d < min)
{
min = d;
}
else
{
if (d > max)
{
max = d;
}
}
}
}
public bool Equals(VectorForCollision v)
{
return(X == v.X && Y == v.Y);
}
public override bool Equals(object obj)
{
VectorForCollision v = (VectorForCollision)obj;
return(X == v.X && Y == v.Y);
}
public float DistanceTo(VectorForCollision vector)
{
return((float)Math.Sqrt(Math.Pow(vector.X - this.X, 2) + Math.Pow(vector.Y - this.Y, 2)));
}
public float DotProduct(VectorForCollision vector)
{
return(this.X * vector.X + this.Y * vector.Y);
}
static public VectorForCollision FromPoint(Point p) => VectorForCollision.FromPoint(p.X, p.Y);
public void Offset(VectorForCollision v)
{
Offset(v.X, v.Y);
}