// Cloud.java
// This is the base abstract class for clouds.  It defines the geometry of
// a cloud and can be used in association with a ScatteringModel sub-class
// to model the path of photons being scattered in clouds.

import java.awt.*;
import java.util.*;

public abstract class Cloud {
	public abstract int Dimension();
	public abstract RTVector ScatterAt(RTVector r,RTVector dir);
	public abstract double OpticalDepth();
//	private abstract double OpticalDensity(RTVector r);
	public abstract boolean IsInCloud(RTVector r);
	public abstract boolean IsBelowCloud(RTVector r);
	public abstract RTVector RandomStartLocation(RTVector dir);
	public abstract void DrawCloud(Panel p);
	public abstract void DrawPath(Panel p,Vector v);

	// This function returns the data set being used by the cloud
	// class.  Exactly what the data set does in the cloud model is
	// determined by the class itself.  In most cases it will be a
	// density profile that can be passed into a Plot2D class for display
	// and alteration.
	public abstract DataSet2D GetData(int which);
	public DataSet2D GetData() {
		return(GetData(0));
	}
}