public MementoDrag(EditorObject transformable)
{
Transformable = transformable;
_polygonCoord = transformable.GetPolygonCoord();
_transform = null;
if (_polygonCoord != null)
{
_parent = (IWall)transformable.Parent;
}
else
{
_transform = transformable.GetTransform();
}
}
public static float EdgeIndexT(IPolygonCoord coord)
{
return coord.EdgeIndex + coord.EdgeT;
}
public static Transform2 GetTransform(IList<Vector2> vertices, IPolygonCoord coord)
{
Transform2 transform = new Transform2();
LineF line = GetEdge(vertices, coord);
transform.Position = line.Lerp(coord.EdgeT);
transform.Rotation = -(float)MathExt.AngleVector(GetEdge(vertices, coord).GetNormal());
return transform;
}
public static LineF GetEdge(IList<Vector2> vertices, IPolygonCoord coord)
{
Debug.Assert(vertices.Count >= 1, "Polygon must have at least 1 vertex.");
return new LineF(vertices[coord.EdgeIndex], vertices[(coord.EdgeIndex + 1) % vertices.Count]);
}
public static FixtureCoord GetFixtureEdgeCoord(Actor actor, IPolygonCoord coord)
{
Debug.Assert(actor.Body != null);
Debug.Assert(coord != null);
FixtureCoord fixtureCoord = coord as FixtureCoord;
if (fixtureCoord != null)
{
Debug.Assert(actor == fixtureCoord.Actor);
return fixtureCoord;
}
List<Vector2> fixtureContour = Actor.GetFixtureContour(actor);
LineF edge = PolygonExt.GetEdge(fixtureContour, coord);
Debug.Assert(
edge[0] == fixtureContour[coord.EdgeIndex] &&
edge[1] == fixtureContour[(coord.EdgeIndex + 1) % fixtureContour.Count]
);
if (!PolygonExt.IsInterior(fixtureContour))
{
edge = edge.Reverse();
}
foreach (Fixture f in actor.Body.FixtureList)
{
switch (f.Shape.ShapeType)
{
case ShapeType.Polygon:
PolygonShape polygon = (PolygonShape)f.Shape;
for (int i = 0; i < polygon.Vertices.Count; i++)
{
int iNext = (i + 1) % polygon.Vertices.Count;
if ((edge[0] - (Vector2)polygon.Vertices[i]).Length < ERROR_MARGIN &&
(edge[1] - (Vector2)polygon.Vertices[iNext]).Length < ERROR_MARGIN)
{
//float edgeT = PolygonExt.IsInterior(fixtureContour) ? coord.EdgeT : 1 - coord.EdgeT;
float edgeT = coord.EdgeT;
return new FixtureCoord(f, i, edgeT);
}
}
break;
default:
Debug.Fail("Cannot currently handle shapes other than polygons.");
break;
}
}
Debug.Fail("Could not find FixtureEdgeCoord.");
return null;
}