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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.Color;
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24 import java.awt.Dimension;
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25 import java.awt.Graphics2D;
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26 import java.awt.geom.Point2D;
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27 import java.awt.geom.Rectangle2D;
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28
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29 import javax.swing.JLabel;
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30
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31 import uk.ac.qmul.eecs.ccmi.diagrammodel.DiagramTreeNode;
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32 import uk.ac.qmul.eecs.ccmi.gui.GraphPanel;
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33
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34
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35 /**
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36 * Provides static methods to draw a {@code SimpleShapeEdge} on a {@code Graphics}
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37 *
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38 */
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39 public abstract class EdgeDrawSupport {
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40 /**
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41 * Draws a string in proximity of a edge.
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42 * @param g2 the graphics context
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43 * @param p an endpoint of the segment along which to
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44 * draw the string
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45 * @param q the other endpoint of the segment along which to
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46 * draw the string
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47 * @param arrow the arrow head painted on the edge end where the string
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48 * is to be painted
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49 * @param s the string to draw
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50 * @param center true if the string should be centered
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51 * along the segment
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52 */
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53
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54 public static void drawString(Graphics2D g2,
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55 Point2D p, Point2D q, ArrowHead arrow, String s, boolean center){
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56 if (s == null || s.length() == 0) return;
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57 label.setText("<html>" + s + "</html>");
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58 label.setFont(g2.getFont());
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59 Dimension d = label.getPreferredSize();
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60 label.setBounds(0, 0, d.width, d.height);
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61
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62 Rectangle2D b = getStringBounds(g2, p, q, arrow, s, center);
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63
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64 Color oldColor = g2.getColor();
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65 g2.setColor(g2.getBackground());
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66 g2.fill(b);
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67 g2.setColor(oldColor);
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68
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69 g2.translate(b.getX(), b.getY());
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70 label.paint(g2);
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71 g2.translate(-b.getX(), -b.getY());
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72 }
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73
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74 /**
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75 * Draws a graphical marker when the edge has notes associated to it
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76 * @see uk.ac.qmul.eecs.ccmi.diagrammodel.TreeModel#setNotes(DiagramTreeNode, String, Object)
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77 *
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78 * @param g2 the graphics context
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79 * @param p an endpoint of the segment along which to draw the string
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80 * @param q the other endpoint of the segment along which to draw the string
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81 */
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82 public static void drawMarker(Graphics2D g2, Point2D p, Point2D q){
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83 Point2D attach = q;
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84 if (p.getX() > q.getX()){
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85 drawMarker(g2, q, p);
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86 return;
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87 }
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88 attach = new Point2D.Double((p.getX() + q.getX()) / 2,
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89 (p.getY() + q.getY()) / 2);
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90 Color oldColor = g2.getColor();
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91 g2.setColor(GraphPanel.GRABBER_COLOR);
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92 g2.fill(new Rectangle2D.Double(attach.getX() - MARKER_SIZE / 2, attach.getY() - MARKER_SIZE / 2, MARKER_SIZE, MARKER_SIZE));
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93 g2.setColor(oldColor);
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94 }
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95
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96 /*
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97 Computes the attachment point for drawing a string.
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98 return the point at which to draw the string
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99 */
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100 private static Point2D getAttachmentPoint(Graphics2D g2,
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101 Point2D p, Point2D q, ArrowHead arrow, Dimension d, boolean center){
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102 final int GAP = 3;
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103 double xoff = GAP;
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104 double yoff = -GAP - d.getHeight();
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105 Point2D attach = q;
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106 if (center){
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107 if (p.getX() > q.getX()){
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108 return getAttachmentPoint(g2, q, p, arrow, d, center);
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109 }
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110 attach = new Point2D.Double((p.getX() + q.getX()) / 2,
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111 (p.getY() + q.getY()) / 2);
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112 if (p.getY() < q.getY())
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113 yoff = - GAP - d.getHeight();
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114 else if (p.getY() == q.getY())
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115 xoff = -d.getWidth() / 2;
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116 else
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117 yoff = GAP;
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118 }
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119 else
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120 {
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121 if (p.getX() < q.getX()){
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122 xoff = -GAP - d.getWidth();
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123 }
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124 if (p.getY() > q.getY()){
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125 yoff = GAP;
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126 }
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127 if (arrow != null){
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128 Rectangle2D arrowBounds = arrow.getPath(p, q).getBounds2D();
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129 if (p.getX() < q.getX()){
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130 xoff -= arrowBounds.getWidth();
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131 }
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132 else{
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133 xoff += arrowBounds.getWidth();
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134 }
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135 }
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136 }
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137 return new Point2D.Double(attach.getX() + xoff, attach.getY() + yoff);
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138 }
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139
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140 /*
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141 * Computes the extent of a string that is drawn along a line segment.
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142 * The rectangle enclosing the string
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143 */
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144 private static Rectangle2D getStringBounds(Graphics2D g2,
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145 Point2D p, Point2D q, ArrowHead arrow, String s, boolean center){
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146 if (g2 == null) return new Rectangle2D.Double();
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147 if (s == null || s.equals("")) return new Rectangle2D.Double(q.getX(), q.getY(), 0, 0);
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148 label.setText("<html>" + s + "</html>");
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149 label.setFont(g2.getFont());
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150 Dimension d = label.getPreferredSize();
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151 Point2D a = getAttachmentPoint(g2, p, q, arrow, d, center);
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152 return new Rectangle2D.Double(a.getX(), a.getY(), d.getWidth(), d.getHeight());
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153 }
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154
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155 /* size of the marker when an edge as notes */
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156 private static final int MARKER_SIZE = 7;
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157 private static JLabel label = new JLabel();
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158 }
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