1 | package org.openstreetmap.josm.actions.mapmode;
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2 |
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3 | import static org.openstreetmap.josm.tools.I18n.tr;
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4 |
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5 | import java.awt.Color;
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6 | import java.awt.Graphics;
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7 | import java.awt.Point;
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8 | import java.awt.event.ActionEvent;
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9 | import java.awt.event.KeyEvent;
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10 | import java.awt.event.MouseEvent;
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11 | import java.awt.event.MouseListener;
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12 |
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13 | import org.openstreetmap.josm.Main;
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14 | import org.openstreetmap.josm.command.AddCommand;
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15 | import org.openstreetmap.josm.data.osm.Node;
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16 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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17 | import org.openstreetmap.josm.data.osm.Segment;
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18 | import org.openstreetmap.josm.gui.MapFrame;
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19 | import org.openstreetmap.josm.tools.ImageProvider;
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20 |
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21 | /**
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22 | * The user can add a new segment between two nodes by pressing on the
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23 | * starting node and dragging to the ending node.
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24 | *
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25 | * No segment can be created if there is already a segment containing
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26 | * both nodes.
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27 | *
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28 | * @author imi
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29 | */
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30 | public class AddSegmentAction extends MapMode implements MouseListener {
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31 |
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32 | /**
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33 | * The first node the user pressed the button onto.
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34 | */
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35 | private Node first;
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36 | /**
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37 | * The second node used if the user releases the button.
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38 | */
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39 | private Node second;
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40 |
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41 | /**
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42 | * Whether the hint is currently drawn on screen.
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43 | */
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44 | private boolean hintDrawn = false;
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45 |
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46 | /**
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47 | * Create a new AddSegmentAction.
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48 | * @param mapFrame The MapFrame this action belongs to.
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49 | */
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50 | public AddSegmentAction(MapFrame mapFrame) {
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51 | super(tr("Add segment"),
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52 | "addsegment",
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53 | tr("Add a segment between two nodes."),
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54 | KeyEvent.VK_G,
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55 | mapFrame,
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56 | ImageProvider.getCursor("normal", "segment"));
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57 | }
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58 |
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59 | @Override public void enterMode() {
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60 | super.enterMode();
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61 | Main.map.mapView.addMouseListener(this);
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62 | Main.map.mapView.addMouseMotionListener(this);
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63 | }
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64 |
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65 | @Override public void exitMode() {
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66 | super.exitMode();
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67 | Main.map.mapView.removeMouseListener(this);
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68 | Main.map.mapView.removeMouseMotionListener(this);
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69 | drawHint(false);
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70 | }
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71 |
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72 |
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73 | @Override public void actionPerformed(ActionEvent e) {
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74 | super.actionPerformed(e);
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75 | makeSegment();
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76 | }
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77 |
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78 | /**
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79 | * If user clicked on a node, from the dragging with that node.
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80 | */
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81 | @Override public void mousePressed(MouseEvent e) {
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82 | if (e.getButton() != MouseEvent.BUTTON1)
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83 | return;
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84 |
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85 | OsmPrimitive clicked = Main.map.mapView.getNearest(e.getPoint(), true);
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86 | if (clicked == null || !(clicked instanceof Node))
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87 | return;
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88 |
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89 | drawHint(false);
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90 | first = second = (Node)clicked;
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91 | }
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92 |
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93 | /**
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94 | * Draw a hint which nodes will get connected if the user release
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95 | * the mouse button now.
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96 | */
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97 | @Override public void mouseDragged(MouseEvent e) {
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98 | if ((e.getModifiersEx() & MouseEvent.BUTTON1_DOWN_MASK) == 0)
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99 | return;
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100 |
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101 | OsmPrimitive clicked = Main.map.mapView.getNearest(e.getPoint(), (e.getModifiersEx() & MouseEvent.ALT_DOWN_MASK) != 0);
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102 | if (clicked == null || clicked == second || !(clicked instanceof Node))
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103 | return;
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104 |
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105 | drawHint(false);
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106 |
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107 | second = (Node)clicked;
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108 | drawHint(true);
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109 | }
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110 |
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111 | /**
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112 | * If left button was released, try to create the segment.
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113 | */
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114 | @Override public void mouseReleased(MouseEvent e) {
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115 | if (e.getButton() == MouseEvent.BUTTON1) {
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116 | makeSegment();
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117 | first = null; // release segment drawing
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118 | }
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119 | }
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120 |
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121 | /**
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122 | * Create the segment if first and second are different and there is
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123 | * not already a segment.
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124 | */
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125 | private void makeSegment() {
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126 | if (first == null || second == null) {
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127 | first = null;
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128 | second = null;
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129 | return;
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130 | }
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131 |
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132 | drawHint(false);
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133 |
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134 | Node start = first;
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135 | Node end = second;
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136 | first = second;
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137 | second = null;
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138 |
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139 | if (start != end) {
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140 | // try to find a segment
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141 | for (Segment ls : Main.ds.segments)
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142 | if (!ls.deleted && ((start == ls.from && end == ls.to) || (end == ls.from && start == ls.to)))
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143 | return; // already a segment here - be happy, do nothing.
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144 |
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145 | Segment ls = new Segment(start, end);
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146 | Main.main.editLayer().add(new AddCommand(ls));
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147 | Main.ds.setSelected(ls);
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148 | }
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149 |
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150 | Main.map.mapView.repaint();
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151 | }
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152 |
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153 | /**
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154 | * Draw or remove the hint line, depending on the parameter.
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155 | */
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156 | private void drawHint(boolean draw) {
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157 | if (draw == hintDrawn)
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158 | return;
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159 | if (first == null || second == null)
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160 | return;
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161 | if (second == first)
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162 | return;
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163 |
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164 | Graphics g = Main.map.mapView.getGraphics();
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165 | g.setColor(Color.BLACK);
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166 | g.setXORMode(Color.WHITE);
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167 | Point firstDrawn = Main.map.mapView.getPoint(first.eastNorth);
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168 | Point secondDrawn = Main.map.mapView.getPoint(second.eastNorth);
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169 | g.drawLine(firstDrawn.x, firstDrawn.y, secondDrawn.x, secondDrawn.y);
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170 | hintDrawn = !hintDrawn;
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171 | }
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172 | }
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