public override double GetArea(Area_Based_Analyses.KnownMeasurementsAggregator known)
{
if (theArc is Semicircle)
{
return((theArc as Semicircle).GetArea(known));
}
// Central Angle; this is minor arc measure by default
double angleMeasure = Angle.toRadians(known.GetAngleMeasure(this.theArc.GetCentralAngle()));
if (angleMeasure <= 0)
{
return(-1);
}
// Make a major arc measure, if needed.
if (theArc is MajorArc)
{
angleMeasure = 2 * Math.PI - angleMeasure;
}
// Radius / Circle
double circArea = theArc.theCircle.GetArea(known);
if (circArea <= 0)
{
return(-1);
}
// The area is a proportion of the circle defined by the angle.
return((angleMeasure / (2 * Math.PI)) * circArea);
}
public override bool CanAreaBeComputed(Area_Based_Analyses.KnownMeasurementsAggregator known)
{
// Central Angle
if (known.GetAngleMeasure(this.theArc.GetCentralAngle()) < 0)
{
return(false);
}
// Radius / Circle
return(theArc.theCircle.CanAreaBeComputed(known));
}