1 | // License: GPL. See LICENSE file for details.
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2 |
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3 | package org.openstreetmap.josm.gui;
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4 |
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5 | import static org.openstreetmap.josm.tools.I18n.marktr;
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6 |
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7 | import java.awt.Color;
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8 | import java.awt.Graphics;
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9 | import java.awt.geom.Rectangle2D;
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10 |
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11 | import javax.swing.JComponent;
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12 |
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13 | import org.openstreetmap.josm.Main;
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14 | import org.openstreetmap.josm.actions.HelpAction.Helpful;
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15 | import org.openstreetmap.josm.data.coor.LatLon;
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16 | import org.openstreetmap.josm.data.projection.Projection;
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17 |
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18 | public class MapScaler extends JComponent implements Helpful {
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19 |
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20 | private final NavigatableComponent mv;
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21 | public MapScaler(NavigatableComponent mv, Projection proj) {
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22 | this.mv = mv;
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23 | setSize(100,30);
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24 | setOpaque(false);
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25 | }
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26 |
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27 | @Override public void paint(Graphics g) {
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28 | LatLon ll1 = mv.getLatLon(0,0);
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29 | LatLon ll2 = mv.getLatLon(100,0);
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30 | double dist = ll1.greatCircleDistance(ll2);
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31 | String text = dist >= 2000 ? Math.round(dist/100)/10 +" km" : (dist >= 1
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32 | ? Math.round(dist*10)/10 +" m" : "< 1 m");
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33 | Rectangle2D bound = g.getFontMetrics().getStringBounds(text, g);
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34 | g.setColor(getColor());
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35 | g.drawLine(0, 5, 99, 5);
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36 | g.drawLine(0, 0, 0, 10);
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37 | g.drawLine(99, 0, 99, 10);
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38 | g.drawLine(49, 0, 49, 10);
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39 | g.drawLine(24, 3, 24, 7);
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40 | g.drawLine(74, 3, 74, 7);
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41 | g.drawString(text, (int)(100-bound.getWidth()), 23);
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42 | g.drawString("0", 0, 23);
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43 | }
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44 |
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45 | static public Color getColor()
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46 | {
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47 | return Main.pref.getColor(marktr("scale"), Color.white);
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48 | }
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49 |
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50 | public String helpTopic() {
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51 | return "MapView/Scaler";
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52 | }
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53 | }
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