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1 /*
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2 CCmI Editor - A Collaborative Cross-Modal Diagram Editing Tool
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3
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4 Copyright (C) 2002 Cay S. Horstmann (http://horstmann.com)
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5 Copyright (C) 2011 Queen Mary University of London (http://ccmi.eecs.qmul.ac.uk/)
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6
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7 This program is free software: you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation, either version 3 of the License, or
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10 (at your option) any later version.
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11
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 package uk.ac.qmul.eecs.ccmi.simpletemplate;
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22
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23 import java.awt.BasicStroke;
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24 import java.awt.Color;
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25 import java.awt.Graphics2D;
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26 import java.awt.Stroke;
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27 import java.awt.geom.GeneralPath;
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28 import java.awt.geom.Point2D;
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29 import java.io.IOException;
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30
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31 /**
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32 This class defines arrowheads of diverse shapes.
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33 */
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34 public enum ArrowHead {
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35 TAIL("Tail"),
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36 TRIANGLE("Triangle"),
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37 BLACK_TRIANGLE("Black Triangle"),
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38 V("V"),
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39 HALF_V("Half V"),
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40 DIAMOND("Diamond"),
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41 BLACK_DIAMOND("Black Diamond");
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42
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43 private ArrowHead(String name) {
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44 this.lowerCaseName = name;
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45 }
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46
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47 public static ArrowHead getArrowHeadFromString(String arrowHeadName) throws IOException{
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48 ArrowHead h;
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49 String name = arrowHeadName.toUpperCase().replace(" ", "_");
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50 try {
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51 h = ArrowHead.valueOf(name);
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52 }catch (IllegalArgumentException e){
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53 throw new IOException(e);
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54 }
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55 return h;
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56 }
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57
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58 @Override
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59 public String toString(){
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60 return lowerCaseName;
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61 }
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62
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63 /**
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64 Draws the arrowhead.
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65 @param g2 the graphics context
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66 @param p a point on the axis of the arrow head
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67 @param q the end point of the arrow head
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68 */
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69 public void draw(Graphics2D g2, Point2D p, Point2D q){
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70 GeneralPath path = getPath(p, q);
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71 Color oldColor = g2.getColor();
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72 if (this == BLACK_DIAMOND || this == BLACK_TRIANGLE)
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73 g2.setColor(Color.BLACK);
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74 else
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75 g2.setColor(Color.WHITE);
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76 g2.fill(path);
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77 g2.setColor(oldColor);
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78 Stroke oldStroke = g2.getStroke();
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79 g2.setStroke(new BasicStroke());
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80 g2.draw(path);
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81 g2.setStroke(oldStroke);
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82 }
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83
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84 /**
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85 Gets the path of the arrowhead
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86 @param p a point on the axis of the arrow head
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87 @param q the end point of the arrow head
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88 @return the path
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89 */
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90 public GeneralPath getPath(Point2D p, Point2D q){
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91 GeneralPath path = new GeneralPath();
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92 final double ARROW_ANGLE = Math.PI / 6;
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93 final double ARROW_LENGTH = 10;
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94
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95 double dx = q.getX() - p.getX();
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96 double dy = q.getY() - p.getY();
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97 double angle = Math.atan2(dy, dx);
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98 double x1 = q.getX()
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99 - ARROW_LENGTH * Math.cos(angle + ARROW_ANGLE);
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100 double y1 = q.getY()
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101 - ARROW_LENGTH * Math.sin(angle + ARROW_ANGLE);
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102 double x2 = q.getX()
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103 - ARROW_LENGTH * Math.cos(angle - ARROW_ANGLE);
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104 double y2 = q.getY()
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105 - ARROW_LENGTH * Math.sin(angle - ARROW_ANGLE);
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106
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107 path.moveTo((float)q.getX(), (float)q.getY());
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108 path.lineTo((float)x1, (float)y1);
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109 if (this == V)
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110 {
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111 path.moveTo((float)x2, (float)y2);
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112 path.lineTo((float)q.getX(), (float)q.getY());
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113 }
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114 else if (this == TRIANGLE || this == BLACK_TRIANGLE)
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115 {
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116 path.lineTo((float)x2, (float)y2);
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117 path.closePath();
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118 }
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119 else if (this == DIAMOND || this == BLACK_DIAMOND)
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120 {
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121 double x3 = x2 - ARROW_LENGTH * Math.cos(angle + ARROW_ANGLE);
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122 double y3 = y2 - ARROW_LENGTH * Math.sin(angle + ARROW_ANGLE);
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123 path.lineTo((float)x3, (float)y3);
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124 path.lineTo((float)x2, (float)y2);
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125 path.closePath();
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126 }
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127 return path;
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128 }
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129
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130 private String lowerCaseName;
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131 }
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