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annotate dwtx/draw2d/ChopboxAnchor.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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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 dwtx.draw2d.ChopboxAnchor;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.draw2d.geometry.Point;
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18 import dwtx.draw2d.geometry.Rectangle;
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19 import dwtx.draw2d.IFigure;
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20 import dwtx.draw2d.AbstractConnectionAnchor;
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21
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22 /**
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23 * The ChopboxAnchor's location is found by calculating the intersection of a line drawn
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24 * from the center point of its owner's box to a reference point on that box. Thus
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25 * {@link Connection Connections} using the ChopBoxAnchor will be oriented such that they
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26 * point to their owner's center.
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27 */
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28 public class ChopboxAnchor
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29 : AbstractConnectionAnchor
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30 {
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31
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32 /**
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33 * Constructs a new ChopboxAnchor.
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34 */
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35 protected this() { }
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36
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37 /**
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38 * Constructs a ChopboxAnchor with the given <i>owner</i> figure.
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39 *
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40 * @param owner The owner figure
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41 * @since 2.0
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42 */
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43 public this(IFigure owner) {
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44 super(owner);
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45 }
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46
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47 /**
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48 * Gets a Rectangle from {@link #getBox()} and returns the Point where a line from the
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49 * center of the Rectangle to the Point <i>reference</i> intersects the Rectangle.
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50 *
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51 * @param reference The reference point
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52 * @return The anchor location
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53 */
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54 public Point getLocation(Point reference) {
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55 Rectangle r = Rectangle.SINGLETON;
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56 r.setBounds(getBox());
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57 r.translate(-1, -1);
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58 r.resize(1, 1);
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59
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60 getOwner().translateToAbsolute(r);
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61 float centerX = r.x + 0.5f * r.width;
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62 float centerY = r.y + 0.5f * r.height;
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63
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64 if (r.isEmpty() || (reference.x is cast(int)centerX && reference.y is cast(int)centerY))
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65 return new Point(cast(int)centerX, cast(int)centerY); //This avoids divide-by-zero
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66
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67 float dx = reference.x - centerX;
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68 float dy = reference.y - centerY;
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69
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70 //r.width, r.height, dx, and dy are guaranteed to be non-zero.
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71 float scale = 0.5f / Math.max(Math.abs(dx) / r.width, Math.abs(dy) / r.height);
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72
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73 dx *= scale;
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74 dy *= scale;
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75 centerX += dx;
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76 centerY += dy;
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77
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78 return new Point(Math.round(centerX), Math.round(centerY));
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79 }
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80
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81 /**
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82 * Returns the bounds of this ChopboxAnchor's owner. Subclasses can override this method
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83 * to adjust the box the anchor can be placed on. For instance, the owner figure may have
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84 * a drop shadow that should not be included in the box.
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85 *
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86 * @return The bounds of this ChopboxAnchor's owner
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87 * @since 2.0
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88 */
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89 protected Rectangle getBox() {
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90 return getOwner().getBounds();
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91 }
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92
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93 /**
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94 * Returns the anchor's reference point. In the case of the ChopboxAnchor, this is the
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95 * center of the anchor's owner.
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96 *
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97 * @return The reference point
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98 */
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99 public Point getReferencePoint() {
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100 Point ref_ = getBox().getCenter();
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101 getOwner().translateToAbsolute(ref_);
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102 return ref_;
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103 }
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104
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105
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106 /**
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107 * Returns <code>true</code> if the other anchor has the same owner and box.
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108 * @param obj the other anchor
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109 * @return <code>true</code> if equal
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110 */
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111 public override int opEquals(Object obj) {
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112 if (auto other = cast(ChopboxAnchor)obj ) {
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113 return other.getOwner() is getOwner() && other.getBox().opEquals(getBox());
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114 }
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115 return false;
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116 }
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117
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118 /**
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119 * The owning figure's hashcode is used since equality is approximately based on the
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120 * owner.
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121 * @return the hash code.
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122 */
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123 public override hash_t toHash() {
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124 if (getOwner() !is null)
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125 return (cast(Object)getOwner()).toHash();
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126 else
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127 return super.toHash();
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128 }
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129
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130 }