Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/uml/diagram/static_structure/layout/ClassdiagramAssociationEdge.java
// $Id: ClassdiagramAssociationEdge.java 12937 2007-06-30 20:07:51Z tfmorris $
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package org.argouml.uml.diagram.static_structure.layout;

import java.awt.Point;

import org.tigris.gef.presentation.FigEdge;
import org.tigris.gef.presentation.FigNode;
import org.tigris.gef.presentation.FigPoly;

/**
 *
 * @author  mkl
 */
public class ClassdiagramAssociationEdge extends ClassdiagramEdge {

    /**
     * The constructor.
     *
     * @param edge the fig of the edge
     */
    public ClassdiagramAssociationEdge(FigEdge edge) {
        super(edge);
    }

    /**
     * Size of self association edges.
     */
    private static final int SELF_SIZE = 30;
    
    /*
     * @see org.argouml.uml.diagram.layout.LayoutedEdge#layout()
     */
    public void layout() {
        // TODO: Multiple associations between the same pair of elements
        // need to be special cased so that they don't overlap - tfm - 20060228
        
        // self associations are special cases. No need to let the maze
        // runner find the way.
        if (getDestFigNode() == getSourceFigNode()) {
            Point centerRight = getCenterRight((FigNode) getSourceFigNode());
            int yoffset = getSourceFigNode().getHeight() / 2;
            yoffset = java.lang.Math.min(SELF_SIZE, yoffset);
            FigPoly fig = getUnderlyingFig();
            fig.addPoint(centerRight);
            // move more right
            fig.addPoint(centerRight.x + SELF_SIZE, centerRight.y);
            // move down
            fig.addPoint(centerRight.x + SELF_SIZE, centerRight.y + yoffset);
            // move left
            fig.addPoint(centerRight.x, centerRight.y + yoffset);

            fig.setFilled(false);
            fig.setSelfLoop(true);
            getCurrentEdge().setFig(fig);
        }
        /* else {
            // brute force rectangular layout
            Point centerSource = sourceFigNode.center();
            Point centerDest   = destFigNode.center();

            underlyingFig.addPoint(centerSource.x, centerSource.y);
            underlyingFig.addPoint(centerSource.x +
                                   (centerDest.x-centerSource.x)/2,
                                   centerSource.y);
            underlyingFig.addPoint(centerSource.x +
                                   (centerDest.x-centerSource.x)/2,
                                   centerDest.y);
            underlyingFig.addPoint(centerDest.x, centerDest.y);
            underlyingFig.setFilled(false);
            underlyingFig.setSelfLoop(false);
            currentEdge.setFig(underlyingFig);
        }*/
    }

    /**
     * Return a point which is centered vertically on the right hand edge of the
     * figure.
     * 
     * @param fig
     *            The fig.
     * @return A Point.
     */
    private Point getCenterRight(FigNode fig) {
        Point center = fig.getCenter();
        return new Point(center.x + fig.getWidth() / 2, center.y);
    }
}







