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1 import java.applet.Applet  ;
2 import java.awt.BorderLayout ;
3 import java.awt.Canvas ;
4 import java.awt.Color ;
5 import java.awt.event.MouseAdapter ;
6 import java.awt.event.MouseEvent ;
7 import java.awt.event.MouseListener ;
8 import java.awt.event.MouseMotionAdapter ;
9 import java.awt.event.MouseMotionListener ;
10 import java.util.Properties ;
11
12 import jcckit.GraphicsPlotCanvas;
13 import jcckit.data.DataCurve;
14 import jcckit.data.DataPlot;
15 import jcckit.data.DataPoint;
16 import jcckit.graphic.GraphPoint;
17 import jcckit.graphic.GraphicalElement;
18 import jcckit.graphic.Rectangle;
19 import jcckit.graphic.ShapeAttributes;
20 import jcckit.plot.CartesianCoordinateSystem;
21 import jcckit.util.ConfigParameters;
22 import jcckit.util.PropertiesBasedConfigData;
23
24
32 public class ZoomExample extends Applet
33 {
34 private static double X_MIN_DEFAULT = -1.1;
35 private static double X_MAX_DEFAULT = 1.1;
36 private static double Y_MIN_DEFAULT = -1.1;
37 private static double Y_MAX_DEFAULT = 1.1;
38
39 private static final int NUMBER_OF_ITERATIONS = 6;
40 private static final double H = 1 / (2 * Math.sqrt(3));
41
42 private static final ShapeAttributes MARKER_ATTRIBUTES
43 = new ShapeAttributes(null, Color.gray, 0, null);
44
45 private GraphicsPlotCanvas _plotCanvas;
46 private GraphPoint _anchor;
47
48 private MouseListener _mouseListener = new MouseAdapter ()
49 {
50 public void mouseClicked(MouseEvent event)
51 {
52 if (event.getClickCount() > 1)
53 {
54 resetViewWindow();
55 }
56 }
57
58 public void mousePressed(MouseEvent event)
59 {
60 _anchor = getPosition(event);
61 drawMarker(_anchor);
62 }
63
64 public void mouseReleased(MouseEvent event)
65 {
66 changeViewingWindow(getPosition(event));
67 }
68 };
69
70 private MouseMotionListener _mouseMotionListener = new MouseMotionAdapter ()
71 {
72 public void mouseDragged(MouseEvent event)
73 {
74 drawMarker(getPosition(event));
75 }
76 };
77
78 public void init() {
79 createPlotCanvas();
80 _plotCanvas.connect(createData());
81
82 setLayout(new BorderLayout ());
83 Canvas graphicsCanvas = _plotCanvas.getGraphicsCanvas();
84 graphicsCanvas.addMouseListener(_mouseListener);
85 graphicsCanvas.addMouseMotionListener(_mouseMotionListener);
86 add(graphicsCanvas, BorderLayout.CENTER);
87
88 resetViewWindow();
89 }
90
91 private void createPlotCanvas() {
92 Properties props = new Properties ();
93 props.put("background", "0xffffff");
94 props.put("paper", "0 0 1 1");
95 props.put("plot/legendVisible", "false");
96 _plotCanvas = new GraphicsPlotCanvas(
97 new ConfigParameters(new PropertiesBasedConfigData(props)));
98 }
99
100 private void resetViewWindow()
101 {
102 setCoordinateSystem(X_MIN_DEFAULT, Y_MIN_DEFAULT,
103 X_MAX_DEFAULT, Y_MAX_DEFAULT);
104 }
105
106 private void setCoordinateSystem(double xMin, double yMin,
107 double xMax, double yMax)
108 {
109 Properties props = new Properties ();
110 props.put("xAxis/minimum", Double.toString(xMin));
111 props.put("xAxis/maximum", Double.toString(xMax));
112 props.put("xAxis/ticLabelFormat", "%1.3f");
113 props.put("xAxis/axisLabel", "");
114 props.put("yAxis/minimum", Double.toString(yMin));
115 props.put("yAxis/maximum", Double.toString(yMax));
116 props.put("yAxis/ticLabelFormat", "%1.3f");
117 props.put("yAxis/axisLabel", "");
118 props.put("yAxis/axisLength", "0.8");
119 CartesianCoordinateSystem cs = new CartesianCoordinateSystem(
120 new ConfigParameters(new PropertiesBasedConfigData(props)));
121 _plotCanvas.getPlot().setCoordinateSystem(cs);
122 }
123
124 private DataPlot createData()
125 {
126 DataPlot dataPlot = new DataPlot();
127 DataCurve dataCurve = new DataCurve("");
128 DataPoint a = new DataPoint(-3 * H, 0.5);
129 DataPoint b = new DataPoint(3 * H, 0.5);
130 DataPoint c = new DataPoint(0, -1);
131 makeKochCurve(dataCurve, a, b, NUMBER_OF_ITERATIONS);
132 makeKochCurve(dataCurve, b, c, NUMBER_OF_ITERATIONS);
133 makeKochCurve(dataCurve, c, a, NUMBER_OF_ITERATIONS);
134 dataPlot.addElement(dataCurve);
135 return dataPlot;
136 }
137
138 private void makeKochCurve(DataCurve curve, DataPoint p1, DataPoint p2,
139 int numberOfIterations)
140 {
141 if (numberOfIterations == 0)
142 {
143 curve.addElement(p1);
144 curve.addElement(p2);
145 } else
146 {
147 numberOfIterations--;
148 double x1 = p1.getX();
149 double y1 = p1.getY();
150 double dx = p2.getX() - x1;
151 double dy = p2.getY() - y1;
152 DataPoint a = new DataPoint(x1 + dx / 3, y1 + dy / 3);
153 DataPoint b = new DataPoint(x1 + dx / 2 - H * dy, y1 + dy / 2 + H * dx);
154 DataPoint c = new DataPoint(x1 + 2 * dx / 3, y1 + 2 * dy / 3);
155 makeKochCurve(curve, p1, a, numberOfIterations);
156 makeKochCurve(curve, a, b, numberOfIterations);
157 makeKochCurve(curve, b, c, numberOfIterations);
158 makeKochCurve(curve, c, p2, numberOfIterations);
159 }
160 }
161
162 private GraphPoint getPosition(MouseEvent event)
163 {
164 return _plotCanvas.mapCursorPosition(event.getX(), event.getY());
165 }
166
167 private void drawMarker(GraphPoint point)
168 {
169 double x0 = _anchor.getX();
170 double y0 = _anchor.getY();
171 double x1 = point.getX();
172 double y1 = point.getY();
173 GraphPoint center = new GraphPoint(0.5 * (x0 + x1), 0.5 * (y0 + y1));
174 setMarker(new Rectangle(center, Math.abs(x1 - x0), Math.abs(y1 - y0),
175 MARKER_ATTRIBUTES));
176 }
177
178 private void setMarker(GraphicalElement marker)
179 {
180 _plotCanvas.setMarker(marker);
181 _plotCanvas.getGraphicsCanvas().repaint();
182 }
183
184 private void changeViewingWindow(GraphPoint point)
185 {
186 DataPoint p0 = _plotCanvas.getPlot().transform(_anchor);
187 DataPoint p1 = _plotCanvas.getPlot().transform(point);
188 double xMin = p0.getX();
189 double xMax = p1.getX();
190 if (xMin > xMax)
191 {
192 xMin = p1.getX();
193 xMax = p0.getX();
194 }
195 double yMin = p0.getY();
196 double yMax = p1.getY();
197 if (yMin > yMax)
198 {
199 yMin = p1.getY();
200 yMax = p0.getY();
201 }
202 setMarker(null);
203 if (xMin != xMax && yMin != yMax)
204 {
205 setCoordinateSystem(xMin, yMin, xMax, yMax);
206 }
207 }
208 }
209 |
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