public static Body AddBody(Scene Scene)
{
Body body = new Body();
ArrayUtilities.Add(ref Scene.Bodies, body);
body.Orientation = Matrix2.Identity;
return(body);
}
public static async Task GetRemoteUrlSources()
{
string remoteUrlSourceFile = await httpClient.GetStringAsync(AppSettings.RemoteUrlSourceUrl);
if (!String.IsNullOrWhiteSpace(remoteUrlSourceFile))
{
// Parse the file into a list of strings. Split by either carraige return, or
// line feed to account for platform differences in the platform that created
// the RemoteUrlSource feeds list file.
string[] arrayCRLF = { "\r", "\n" };
string[] RemoteUrlSources = remoteUrlSourceFile.Split(arrayCRLF, StringSplitOptions.RemoveEmptyEntries);
// Now parse each additional feed and add it to the master collection.
foreach (string RemoteUrlSourceAsStr in RemoteUrlSources)
{
UrlSource source = stringToUrlSource(RemoteUrlSourceAsStr);
switch (source.Type)
{
case "RssService":
ArrayUtilities.Add(ref AppSettings.RssAddressCollection, source);
AppSettings.EnableRssService = true;
break;
case "YoutubeService":
ArrayUtilities.Add(ref AppSettings.YoutubeAddressCollection, source);
AppSettings.EnableYoutubeService = true;
break;
case "TwitterService":
ArrayUtilities.Add(ref AppSettings.TwitterAddressCollection, source);
//Twitter should be enabled prior to app submission on account of Oauth requirements
break;
default:
ServiceLocator.MessageService.ShowErrorAsync("Unable to add UrlSource of type " + source.Type + " to a valid collection, source will not be retrieved", "Application Error");
break;
}
}
}
}
private static void DispatchPolygonToPolygon(Manifold Manifold)
{
PolygonShape a = (PolygonShape)Manifold.BodyA.Shape;
PolygonShape b = (PolygonShape)Manifold.BodyB.Shape;
Manifold.Points = null;
// Check for a separating axis with A's face planes
uint faceA;
Number penetrationA;
FindAxisLeastPenetration(Manifold.BodyA, Manifold.BodyB, out faceA, out penetrationA);
if (penetrationA >= 0)
{
return;
}
// Check for a separating axis with B's face planes
uint faceB;
Number penetrationB;
FindAxisLeastPenetration(Manifold.BodyB, Manifold.BodyA, out faceB, out penetrationB);
if (penetrationB >= 0)
{
return;
}
uint referenceIndex;
bool flip; // Always point from a to b
Body refBody;
Body incBody;
PolygonShape refPoly;
PolygonShape incPoly;
// Determine which shape contains reference face
if (Math.BiasGreaterThan(penetrationA, penetrationB))
{
refBody = Manifold.BodyA;
refPoly = a;
incBody = Manifold.BodyB;
incPoly = b;
referenceIndex = faceA;
flip = false;
}
else
{
refBody = Manifold.BodyB;
refPoly = b;
incBody = Manifold.BodyA;
incPoly = a;
referenceIndex = faceB;
flip = true;
}
Matrix2 refBodyOrientation = refBody.Orientation;
// World space incident face
Vector2[] incidentFace = new Vector2[2];
FindIncidentFace(incidentFace, refBody, refPoly, incBody, incPoly, referenceIndex);
// y
// ^ ->n ^
// +---c ------posPlane--
// x < | i |\
// +---+ c-----negPlane--
// \ v
// r
//
// r : reference face
// i : incident poly
// c : clipped point
// n : incident normal
// Setup reference face vertices
Vector2 v1 = refPoly.Vertices[referenceIndex];
referenceIndex = referenceIndex + 1 == refPoly.Vertices.Length ? 0 : referenceIndex + 1;
Vector2 v2 = refPoly.Vertices[referenceIndex];
// Transform vertices to world space
v1 = refBodyOrientation * v1 + refBody.Position;
v2 = refBodyOrientation * v2 + refBody.Position;
// Calculate reference face side normal in world space
Vector2 sidePlaneNormal = (v2 - v1);
sidePlaneNormal.Normalize();
// Orthogonalize
Vector2 refFaceNormal = new Vector2(sidePlaneNormal.Y, -sidePlaneNormal.X);
// ax + by = c
// c is distance from origin
Number refC = refFaceNormal.Dot(v1);
Number negSide = -sidePlaneNormal.Dot(v1);
Number posSide = sidePlaneNormal.Dot(v2);
// Clip incident face to reference face side planes
if (Clip(-sidePlaneNormal, negSide, incidentFace) < 2)
{
return; // Due to floating point error, possible to not have required points
}
if (Clip(sidePlaneNormal, posSide, incidentFace) < 2)
{
return; // Due to floating point error, possible to not have required points
}
// Flip
Manifold.Normal = refFaceNormal * (flip ? -1 : 1);
// Keep points behind reference face
uint cp = 0; // clipped points behind reference face
Number separation = refFaceNormal.Dot(incidentFace[0]) - refC;
if (separation <= 0)
{
ArrayUtilities.Add(ref Manifold.Points, incidentFace[0]);
Manifold.Penetration = -separation;
++cp;
}
else
{
Manifold.Penetration = 0;
}
separation = refFaceNormal.Dot(incidentFace[1]) - refC;
if (separation <= 0)
{
ArrayUtilities.Add(ref Manifold.Points, incidentFace[1]);
Manifold.Penetration += -separation;
++cp;
// Average penetration
Manifold.Penetration /= (int)cp;
}
}
