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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/EllipseAnchor.d @ 104:88652073d1c2

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More work on icu
author Frank Benoit <benoit@tionex.de>
date Sat, 02 May 2009 11:27:24 +0200
parents bc29606a740c
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.draw2d.EllipseAnchor;
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15 import java.lang.all;
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17 import org.eclipse.draw2d.geometry.Point;
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18 import org.eclipse.draw2d.geometry.Rectangle;
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19 import org.eclipse.draw2d.AbstractConnectionAnchor;
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20 import org.eclipse.draw2d.IFigure;
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22 /**
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23 * Similar to a {@link org.eclipse.draw2d.ChopboxAnchor}, except this anchor is located on
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24 * the ellipse defined by the owners bounding box.
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25 * @author Alex Selkov
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26 * Created 31.08.2002 23:11:43
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27 */
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28 public class EllipseAnchor : AbstractConnectionAnchor {
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29
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30 /**
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31 * @see org.eclipse.draw2d.AbstractConnectionAnchor#AbstractConnectionAnchor()
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32 */
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33 public this() { }
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34
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35 /**
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36 * @see org.eclipse.draw2d.AbstractConnectionAnchor#AbstractConnectionAnchor(IFigure)
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37 */
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38 public this(IFigure owner) {
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39 super(owner);
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40 }
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41
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42 /**
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43 * Returns a point on the ellipse (defined by the owner's bounding box) where the
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44 * connection should be anchored.
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45 * @see org.eclipse.draw2d.ConnectionAnchor#getLocation(Point)
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46 */
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47 public Point getLocation(Point reference) {
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48 Rectangle r = Rectangle.SINGLETON;
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49 r.setBounds(getOwner().getBounds());
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50 r.translate(-1, -1);
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51 r.resize(1, 1);
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52 getOwner().translateToAbsolute(r);
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54 Point ref_ = r.getCenter().negate().translate(reference);
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56 if (ref_.x is 0)
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57 return new Point(reference.x, (ref_.y > 0) ? r.bottom() : r.y);
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58 if (ref_.y is 0)
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59 return new Point((ref_.x > 0) ? r.right() : r.x, reference.y);
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60
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61 float dx = (ref_.x > 0) ? 0.5f : -0.5f;
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62 float dy = (ref_.y > 0) ? 0.5f : -0.5f;
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64 // ref.x, ref.y, r.width, r.height !is 0 => safe to proceed
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66 float k = cast(float)(ref_.y * r.width) / (ref_.x * r.height);
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67 k = k * k;
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69 return r.getCenter().translate(cast(int)(r.width * dx / Math.sqrt(1 + k)),
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70 cast(int)(r.height * dy / Math.sqrt(1 + 1 / k)));
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71 }
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72 }