OrientationHandle.java

/*
 * @(#)OrientationHandle.java
 *
 * Copyright (c) 1996-2010 The authors and contributors of JHotDraw.
 * You may not use, copy or modify this file, except in compliance with the 
 * accompanying license terms.
 */

package org.jhotdraw.draw.handle;

import org.jhotdraw.draw.*;
import org.jhotdraw.draw.event.AttributeChangeEdit;
import java.awt.*;
import java.awt.geom.*;
import static org.jhotdraw.draw.AttributeKeys.*;
import org.jhotdraw.geom.*;

/**
 * A {@link Handle} to change the value of the figure attribute
 * {@link org.jhotdraw.draw.AttributeKeys#ORIENTATION}.
 *
 * @author Werner Randelshofer.
 *         Original code by Doug Lea  (dl at gee, Sun Mar 2 19:15:28 1997)
 * @version $Id$
 */
public class OrientationHandle extends AbstractHandle {
    private Rectangle centerBox;
    private AttributeKeys.Orientation oldValue;
    private AttributeKeys.Orientation newValue;
    
    /** Creates a new instance. */
    public OrientationHandle(TriangleFigure owner) {
        super(owner);
    }
    
    @Override
    public boolean isCombinableWith(Handle h) {
        return false;
    }
    
    private Point2D.Double getLocation() {
        Figure owner = getOwner();
        Rectangle2D.Double r = owner.getBounds();
        Point2D.Double p;
        double offset = getHandlesize();
        switch (owner.get(ORIENTATION)) {
            case NORTH :
            default :
                p = new Point2D.Double(r.x + r.width / 2d, r.y + offset);
                break;
            case NORTH_EAST :
                p = new Point2D.Double(r.x + r.width - offset, r.y + offset);
                break;
            case EAST :
                p = new Point2D.Double(r.x + r.width - offset, r.y + r.height / 2d);
                break;
            case SOUTH_EAST :
                p = new Point2D.Double(r.x + r.width - offset, r.y + r.height - offset);
                break;
            case SOUTH :
                p = new Point2D.Double(r.x + r.width / 2d, r.y + r.height - offset);
                break;
            case SOUTH_WEST :
                p = new Point2D.Double(r.x + offset, r.y + r.height - offset);
                break;
            case WEST :
                p = new Point2D.Double(r.x  + offset, r.y + r.height / 2d);
                break;
            case NORTH_WEST :
                p = new Point2D.Double(r.x + offset, r.y + offset);
                break;
        }
        return p;
    }
    
    @Override
    protected Rectangle basicGetBounds() {
        Point p = view.drawingToView(getLocation());
        Rectangle r = new Rectangle(p);
        int h = getHandlesize();
        r.x -= h / 2;
        r.y -= h / 2;
        r.width = r.height = h;
        return r;
    }
    
    @Override
    public void trackStart(Point anchor, int modifiersEx) {
        oldValue = getOwner().get(ORIENTATION);
        
        centerBox = view.drawingToView(getOwner().getBounds());
        centerBox.grow(centerBox.width / -3, centerBox.height / -3);
    }
    
    @Override
    public void trackStep(Point anchor, Point lead, int modifiersEx) {
        Rectangle leadRect = new Rectangle(lead);
        
        switch (Geom.outcode(centerBox, leadRect)) {
            case Geom.OUT_TOP :
            default :
                newValue = AttributeKeys.Orientation.NORTH;
                break;
            case Geom.OUT_TOP | Geom.OUT_RIGHT :
                newValue = AttributeKeys.Orientation.NORTH_EAST;
                break;
            case Geom.OUT_RIGHT :
                newValue = AttributeKeys.Orientation.EAST;
                break;
            case Geom.OUT_BOTTOM | Geom.OUT_RIGHT :
                newValue = AttributeKeys.Orientation.SOUTH_EAST;
                break;
            case Geom.OUT_BOTTOM :
                newValue = AttributeKeys.Orientation.SOUTH;
                break;
            case Geom.OUT_BOTTOM | Geom.OUT_LEFT :
                newValue = AttributeKeys.Orientation.SOUTH_WEST;
                break;
            case Geom.OUT_LEFT :
                newValue = AttributeKeys.Orientation.WEST;
                break;
            case Geom.OUT_TOP | Geom.OUT_LEFT :
                newValue = AttributeKeys.Orientation.NORTH_WEST;
                break;
        }
        getOwner().willChange();
        getOwner().set(ORIENTATION, newValue);
        getOwner().changed();
        updateBounds();
    }
    @Override
    public void draw(Graphics2D g) {
        drawDiamond(g, 
                getEditor().getHandleAttribute(HandleAttributeKeys.ATTRIBUTE_HANDLE_FILL_COLOR),
                getEditor().getHandleAttribute(HandleAttributeKeys.ATTRIBUTE_HANDLE_STROKE_COLOR)
                );
    }
    
    @Override
    public void trackEnd(Point anchor, Point lead, int modifiersEx) {
        if (newValue != oldValue) {
            fireUndoableEditHappened(
                    new AttributeChangeEdit<AttributeKeys.Orientation>(getOwner(), ORIENTATION, oldValue, newValue)
                    );
        }
    }
    
}