import java.awt.Graphics;

/** This class represents a connection on the construction panel.*/
public class CP_Connection {

	/** References to the objects that take part in the connection. */
	private CP_Item src, dest;
	/** The number of the ports of the objects that take part in the connection. */
	private int srcPort, destPort;

	/** The constructor. */
	public CP_Connection(CP_Item _src, int _sp, CP_Item _dest, int _dp) {
		src = _src; srcPort = _sp;
		dest = _dest; destPort = _dp;
	}

	/** Sets the source of the connection. */
	public void setSrc(CP_Item _src, int _port) {
		src = _src;
		srcPort = _port;
	}

	/** Sets the destination of the connection. */
	public void setDest(CP_Item _dest, int _port) {
		dest = _dest;
		destPort = _port;
	}

	/** Returns the source object of the connection. */
	public CP_Item getSrc() { return src; }
	/** Returns the source port of the connection. */
	public int getSrcPort() { return srcPort; }
	/** Returns the destination object of the connection. */
	public CP_Item getDest() { return dest; }
	/** Returns the destination port of the connection. */
	public int getDestPort() { return destPort; }

	/** Draws the connection. */
	public void draw(Graphics g) {
		g.drawLine(src.getPortX(srcPort),src.getPortY(srcPort),
			     dest.getPortX(destPort),dest.getPortY(destPort));
	}
}