// $Id: ClassdiagramEdge.java,v 1.7 2004/09/21 19:03:30 mvw Exp $
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// software and its documentation without fee, and without a written
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package org.argouml.uml.diagram.static_structure.layout;

import org.argouml.uml.diagram.layout.*;
import org.tigris.gef.presentation.*;

/** This class is an abstract implementation of all edges which are
 *  layoutable in the classdiagram.
 *  @author Markus Klink
 *  @since 0.11.1
 */
public abstract class ClassdiagramEdge implements LayoutedEdge {
    
    /** the layout is oriented on a grid. These are our grid spaces.
     */
    private static int vGap;
    private static int hGap;
    
    
    private FigEdge currentEdge = null;
    /** the underlying fig of the edge we want to layout */
    private FigPoly underlyingFig = null;
    
    /** each fig has a source and a destination port
     */
    private Fig destFigNode;
    private Fig sourceFigNode;
    
   
    /** Constructor. 
     * @param edge the Edge to layout
     */
    public ClassdiagramEdge(FigEdge edge) {
        currentEdge = edge;
        underlyingFig = new FigPoly();
        underlyingFig.setLineColor(edge.getFig().getLineColor());
       
        destFigNode = edge.getDestFigNode();
        sourceFigNode = edge.getSourceFigNode();
    }
    
    /** 
     * Abstract method to layout the edge.
     *
     * @see org.argouml.uml.diagram.layout.LayoutedEdge#layout()
     */
    public abstract void layout();  
 
    /**
     * @param h the horizontal gap
     */
    public static void setHGap(int h) { hGap = h; }
    
    /**
     * @param v the vertical gap
     */
    public static void setVGap(int v) { vGap = v; }
    
    /**
     * @return the horizontal gap
     */
    public static int getHGap() { return hGap; }
    
    /**
     * @return the vertical gap
     */
    public static int getVGap() { return vGap; }

    /**
     * @return Returns the destFigNode.
     */
    Fig getDestFigNode() {
        return destFigNode;
    }

    /**
     * @return Returns the sourceFigNode.
     */
    Fig getSourceFigNode() {
        return sourceFigNode;
    }

    /**
     * @return Returns the currentEdge.
     */
    protected FigEdge getCurrentEdge() {
        return currentEdge;
    }

    /**
     * @return Returns the underlyingFig.
     */
    protected FigPoly getUnderlyingFig() {
        return underlyingFig;
    }
    
}