public static void PhysicsUpdate(OrbitWidgetIconData icon)
{
var ralitivePoint = (icon.IconData.WorldPosition - icon.InsertionPoint);
icon._orbitEllipseSemiMaj = (ralitivePoint).Length();
icon._orbitAngleRadians = Math.Atan2(ralitivePoint.Y, ralitivePoint.X);
icon._eccentricity = icon._focalDistance / icon._orbitEllipseSemiMaj;
icon._orbitEllipseSemiMinor = icon._orbitEllipseSemiMaj * Math.Sqrt(1 - icon._eccentricity * icon._eccentricity);
SetPointArray();
PointD pointD = new PointD()
{
x = icon.InsertionPoint.X, y = icon.InsertionPoint.Y
}; //may make this ralitive
double minDist = PointDFunctions.CalcDistance(pointD, icon._points[icon._index]);
for (int i = 0; i < icon._points.Length; i++)
{
double dist = PointDFunctions.CalcDistance(pointD, icon._points[i]);
if (dist < minDist)
{
minDist = dist;
_index = i;
}
}
}
internal void SetPointArray(OrbitWidgetIconData icon)
{
icon._points = new PointD[icon._numberOfArcSegments + 1];
double angle = 0;//_orbitAngleRadians;
for (int i = 0; i < icon._numberOfArcSegments + 1; i++)
{
double x1 = icon._orbitEllipseSemiMaj * Math.Sin(angle) - icon._focalDistance; //we add the focal distance so the focal point is "center"
double y1 = icon._orbitEllipseSemiMinor * Math.Cos(angle);
//rotates the points to allow for the LongditudeOfPeriapsis.
double x2 = (x1 * Math.Cos(icon._orbitAngleRadians)) - (y1 * Math.Sin(icon._orbitAngleRadians));
double y2 = (x1 * Math.Sin(icon._orbitAngleRadians)) + (y1 * Math.Cos(icon._orbitAngleRadians));
angle += icon._segmentArcSweepRadians;
icon._points[i] = new PointD()
{
x = x2, y = y2
};
}
}
internal static OrbitWidgetIconData CreateIcon(PositionDB parentPosition)
{
OrbitWidgetIconData icon = new OrbitWidgetIconData();
icon.IconData.PositionDB = parentPosition;
icon.IconData.ShouldUpdateFromPositionDB = true;
icon.IconData.WorldPosition = parentPosition.AbsolutePosition;
icon._orbitEllipseSemiMaj = 20000;
icon._orbitEllipseMajor = (float)icon._orbitEllipseSemiMaj * 2; //Major Axis
icon._orbitEllipseSemiMinor = 10000;
//_orbitEllipseMinor =
icon._segmentArcSweepRadians = (float)(Math.PI * 2.0 / icon._numberOfArcSegments);
icon._numberOfDrawSegments = (int)Math.Max(1, (icon.EllipseSweepRadians / icon._segmentArcSweepRadians));
icon._alphaChangeAmount = ((float)icon.MaxAlpha - icon.MinAlpha) / icon._numberOfDrawSegments;
return(icon);
}
