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Java > Open Source Codes > org > nightlabs > editor2d > handle > RotateCenterLocator


1 /* *****************************************************************************
2  * NightLabs Editor2D - Graphical editor framework *
3  * Copyright (C) 2004-2005 NightLabs - http://NightLabs.org *
4  * Project author: Daniel Mazurek <Daniel.Mazurek [at] nightlabs [dot] org> *
5  * *
6  * This library is free software; you can redistribute it and/or *
7  * modify it under the terms of the GNU Lesser General Public *
8  * License as published by the Free Software Foundation; either *
9  * version 2.1 of the License, or (at your option) any later version. *
10  * *
11  * This library is distributed in the hope that it will be useful, *
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of *
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
14  * Lesser General Public License for more details. *
15  * *
16  * You should have received a copy of the GNU Lesser General Public *
17  * License along with this library; if not, write to the *
18  * Free Software Foundation, Inc., *
19  * 51 Franklin St, Fifth Floor, *
20  * Boston, MA 02110-1301 USA *
21  * *
22  * Or get it online : *
23  * http://www.gnu.org/copyleft/lesser.html *
24  * *
25  * *
26  ******************************************************************************/
27
28 package org.nightlabs.editor2d.handle;
29
30 import org.eclipse.draw2d.IFigure;
31 import org.eclipse.draw2d.Locator;
32 import org.eclipse.draw2d.geometry.Dimension;
33 import org.eclipse.draw2d.geometry.Point;
34 import org.eclipse.draw2d.geometry.Rectangle;
35
36 import org.nightlabs.editor2d.edit.AbstractDrawComponentEditPart;
37
38
39 public class RotateCenterLocator
40 implements Locator
41 {
42   protected AbstractDrawComponentEditPart owner;
43   public RotateCenterLocator(AbstractDrawComponentEditPart owner)
44   {
45     this.owner = owner;
46   }
47
48   protected Point getLocation()
49   {
50     return new Point(owner.getDrawComponent().getRotationX(),
51         owner.getDrawComponent().getRotationY());
52   }
53   
54   public void relocate(IFigure target)
55   {
56     target.setLocation(calcCenterPoint(target.getBounds(), getReferencePoint(target)));
57   }
58   
59   protected Point calcCenterPoint(Rectangle rect, Point point)
60   {
61     Dimension boundsSize = rect.getSize();
62     return new Point(point.x - boundsSize.width/2, point.y - boundsSize.height/2);
63   }
64   
65   protected Point getReferencePoint(IFigure target)
66   {
67     Point p = getLocation();
68     owner.getFigure().translateToAbsolute(p);
69     target.translateToRelative(p);
70     return p;
71   }
72 }
73
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