DragInfo IGlobalFluidAffectable.GetFluidInfo(Vector2D tangent)
{
Scalar min, max;
ShapeHelper.GetProjectedBounds(this.Vertexes, tangent, out min, out max);
Scalar avg = (max + min) / 2;
return(new DragInfo(tangent * avg, max - min));
}
public static void GetFluidInfo(Vector2D[][] polygons, Vector2D tangent, out Vector2D dragCenter, out Scalar dragArea)
{
Scalar min, max;
Scalar avg;
if (polygons.Length == 1)
{
ShapeHelper.GetProjectedBounds(
polygons[0],
tangent, out min, out max);
avg = (max + min) / 2;
dragCenter = tangent * avg;
dragArea = max - min;
return;
}
SAPNode[] sapNodes = new SAPNode[polygons.Length * 2];
for (int index = 0; index < polygons.Length; ++index)
{
ShapeHelper.GetProjectedBounds(polygons[index], tangent, out min, out max);
sapNodes[index * 2] = new SAPNode(min, true);
sapNodes[(index * 2) + 1] = new SAPNode(max, false);
}
Array.Sort <SAPNode>(sapNodes, comparer);
int depth = 0;
Scalar result = 0;
Scalar start = 0;
for (int index = 0; index < sapNodes.Length; ++index)
{
SAPNode node = sapNodes[index];
if (node.begin)
{
if (depth == 0)
{
start = node.value;
}
depth++;
}
else
{
depth--;
if (depth == 0)
{
result += node.value - start;
}
}
}
avg = (sapNodes[0].value + sapNodes[sapNodes.Length - 1].value) / 2;
dragCenter = tangent * avg;
dragArea = result;
}
DragInfo IExplosionAffectable.GetExplosionInfo(Matrix2x3 matrix, Scalar radius, GetTangentCallback callback)
{
Vector2D[] vertexes2 = new Vector2D[Vertexes.Length];
for (int index = 0; index < vertexes2.Length; ++index)
{
vertexes2[index] = matrix * Vertexes[index];
}
Vector2D[] inter = ShapeHelper.GetIntersection(vertexes2, radius);
if (inter.Length < 3)
{
return(null);
}
Vector2D centroid = PolygonShape.GetCentroid(inter);
Vector2D tangent = callback(centroid);
Scalar min, max;
ShapeHelper.GetProjectedBounds(inter, tangent, out min, out max);
Scalar avg = (max + min) / 2;
return(new DragInfo(tangent * avg, max - min));
}
public static FluidInfo GetFluidInfo(Vector2D[] vertexes2, GetTangentCallback callback, Line line)
{
Vector2D centroid;
Scalar area;
Vector2D dragCenter;
Scalar dragArea;
Vector2D[] vertexes = ShapeHelper.GetIntersection(vertexes2, line);
if (vertexes.Length < 3)
{
return(null);
}
centroid = PolygonShape.GetCentroid(vertexes);
area = PolygonShape.GetArea(vertexes);
Vector2D tangent = callback(centroid);
Scalar min, max;
ShapeHelper.GetProjectedBounds(vertexes, tangent, out min, out max);
Scalar avg = (max + min) / 2;
dragCenter = tangent * avg;
dragArea = max - min;
return(new FluidInfo(dragCenter, dragArea, centroid, area));
}
