public double Area()
{
double accum = 0;
//returns the area of this polygon.
//calculate each triangle...
for (int i = 0; i < points.Count - 1; i += 2)
{
//item i and i+1, and the center, form the triangle.
PointF firstpoint = points[i];
PointF secondpoint = points[i + 1];
PointF midspot = TrigFunctions.MidPoint(firstpoint, secondpoint);
double H = TrigFunctions.Distance(Center, midspot);
//width is distance between the two points.
double W = TrigFunctions.Distance(firstpoint, secondpoint);
accum += (W * H) / 2;
}
return((float)accum);
}
public override PointF PerformFrame(IStateOwner gstate, PointF CurrentLocation)
{
//return new PointF(CurrentLocation.X + _Delta.X, CurrentLocation.Y + _Delta.Y);
TrigFunctions.IncrementLocation(gstate, ref CurrentLocation, _Delta);
return(CurrentLocation);
}
//returns an array representing the distances of each point from the center point of this polygon.
public float[] Radii()
{
PointF CenterP = Center;
return((from m in points select TrigFunctions.Distance(CenterP, m)).ToArray());
}