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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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children 6f068362a363
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1 /*******************************************************************************
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2 * Copyright (c) 2004, 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.graph.Segment;
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14
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15 import java.lang.all;
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16 import tango.text.convert.Format;
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17
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18 import org.eclipse.draw2d.geometry.Geometry;
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19 import org.eclipse.draw2d.geometry.Point;
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20 import org.eclipse.draw2d.graph.Vertex;
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21
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22 /**
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23 * A Segment representation for the ShortestPathRouting. A segment is a line between
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24 * two vertices.
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25 *
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26 * This class is for internal use only
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27 * @author Whitney Sorenson
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28 * @since 3.0
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29 */
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30 class Segment {
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31
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32 Vertex start, end;
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33
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34 /**
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35 * Creates a segment between the given start and end points.
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36 * @param start the start vertex
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37 * @param end the end vertex
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38 */
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39 this(Vertex start, Vertex end) {
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40 this.start = start;
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41 this.end = end;
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42 }
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43
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44 /**
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45 * Returns the cosine of the made between this segment and the given segment
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46 * @param otherSegment the other segment
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47 * @return cosine value (not arc-cos)
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48 */
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49 double cosine(Segment otherSegment) {
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50 double cos = (((start.x - end.x) * (otherSegment.end.x - otherSegment.start.x))
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51 + ((start.y - end.y) * (otherSegment.end.y - otherSegment.start.y)))
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52 / (getLength() * otherSegment.getLength());
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53 double sin = (((start.x - end.x) * (otherSegment.end.y - otherSegment.start.y))
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54 - ((start.y - end.y) * (otherSegment.end.x - otherSegment.start.x)));
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55 if (sin < 0.0)
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56 return (1 + cos);
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57
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58 return -(1 + cos);
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59 }
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60
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61 /**
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62 * Returns the cross product of this segment and the given segment
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63 * @param otherSegment the other segment
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64 * @return the cross product
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65 */
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66 long crossProduct(Segment otherSegment) {
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67 return (((start.x - end.x) * (otherSegment.end.y - end.y))
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68 - ((start.y - end.y) * (otherSegment.end.x - end.x)));
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69 }
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70
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71 private double getLength() {
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72 return (end.getDistance(start));
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73 }
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74
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75 /**
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76 * Returns a number that represents the sign of the slope of this segment. It does
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77 * not return the actual slope.
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78 * @return number representing sign of the slope
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79 */
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80 double getSlope() {
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81 if (end.x - start.x >= 0)
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82 return (end.y - start.y);
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83 else
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84 return -(end.y - start.y);
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85 }
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86
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87 /**
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88 * Returns true if the given segment intersects this segment.
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89 * @param sx start x
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90 * @param sy start y
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91 * @param tx end x
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92 * @param ty end y
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93 * @return true if the segments intersect
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94 */
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95 bool intersects(int sx, int sy, int tx, int ty) {
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96 return Geometry.linesIntersect(start.x, start.y, end.x, end.y, sx, sy, tx, ty);
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97 }
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98
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99 /**
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100 * Return true if the segment represented by the points intersects this segment.
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101 * @param s start point
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102 * @param t end point
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103 * @return true if the segments intersect
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104 */
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105 bool intersects(Point s, Point t) {
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106 return intersects(s.x, s.y, t.x, t.y);
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107 }
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108
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109 /**
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110 * @see java.lang.Object#toString()
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111 */
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112 public String toString() {
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113 return Format( "{}---{}", start, end ); //$NON-NLS-1$
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114 }
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115
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116 }