diff options
Diffstat (limited to 'ws2015/eip/blaetter/04')
-rw-r--r-- | ws2015/eip/blaetter/04/GraphicsWindow.java | 397 | ||||
-rw-r--r-- | ws2015/eip/blaetter/04/VorlageDemo.java | 21 |
2 files changed, 418 insertions, 0 deletions
diff --git a/ws2015/eip/blaetter/04/GraphicsWindow.java b/ws2015/eip/blaetter/04/GraphicsWindow.java new file mode 100644 index 0000000..b92fdaf --- /dev/null +++ b/ws2015/eip/blaetter/04/GraphicsWindow.java | |||
@@ -0,0 +1,397 @@ | |||
1 | import java.util.ArrayList; | ||
2 | import javax.swing.JFrame; | ||
3 | import javax.swing.JPanel; | ||
4 | import javax.swing.Timer; | ||
5 | |||
6 | import java.awt.event.ActionEvent; | ||
7 | import java.awt.event.ActionListener; | ||
8 | import java.awt.event.MouseAdapter; | ||
9 | import java.awt.event.WindowAdapter; | ||
10 | import java.awt.event.WindowEvent; | ||
11 | import java.awt.event.MouseEvent; | ||
12 | import java.awt.Graphics; | ||
13 | import java.awt.Graphics2D; | ||
14 | import java.awt.Shape; | ||
15 | import java.awt.geom.RectangularShape; | ||
16 | import java.awt.geom.GeneralPath; | ||
17 | import java.awt.Point; | ||
18 | import java.awt.Label; | ||
19 | import java.awt.Font; | ||
20 | import java.awt.Color; | ||
21 | import java.awt.Rectangle; | ||
22 | |||
23 | /** | ||
24 | Eine Klasse zu pädagogischen Zwecken. | ||
25 | Erlaubt die Eingabe von Punktkoordinaten | ||
26 | mittels Mausklicks, das Zeichnen einfacher | ||
27 | 2D Objekte (java.awt.Shape), sowie die | ||
28 | Ausgabe von Texten in einer Statuszeile. | ||
29 | @version 3.042 | ||
30 | @author Martin Hofmann und die EiP-Teams verschiedener Jahre | ||
31 | */ | ||
32 | |||
33 | public class GraphicsWindow { | ||
34 | |||
35 | private int width; | ||
36 | private int height; | ||
37 | private JFrame dasFenster; | ||
38 | private static int fensterZahl; | ||
39 | private static int fensterNr; | ||
40 | private Label label; | ||
41 | private GraphicsWindowPanel panel; | ||
42 | private Point mousePos; | ||
43 | private Color activeColor = Color.BLACK; | ||
44 | final private Color backColor = Color.WHITE; | ||
45 | MyMouseAdapter mouseListener; | ||
46 | |||
47 | /** | ||
48 | Erzeugt ein Fenster der Größe 640 auf 480 mit Textausgabe, Mauseingabe und Grafikausgabe. | ||
49 | */ | ||
50 | public GraphicsWindow() { | ||
51 | this(640, 480); | ||
52 | } | ||
53 | |||
54 | /** | ||
55 | Erzeugt ein Fenster in vorgegebener Größe mit Textausgabe, Mauseingabe und Grafikausgabe. | ||
56 | @param width Breite des Fensters | ||
57 | @param height Höhe des Fensters | ||
58 | */ | ||
59 | public GraphicsWindow(int width, int height) { | ||
60 | this.width = width; | ||
61 | this.height = height; | ||
62 | dasFenster = new JFrame(); | ||
63 | dasFenster.setTitle("Grafikfenster " + ++fensterNr); | ||
64 | fensterZahl++; | ||
65 | dasFenster.setLocationByPlatform(true); | ||
66 | dasFenster.setSize(width,height+50); | ||
67 | dasFenster.addWindowListener(new WindowAdapter(){ | ||
68 | public void windowClosing(WindowEvent e) { | ||
69 | dasFenster.dispose(); // nicht gleich alle Fenster abschiessen | ||
70 | if (--fensterZahl<1) System.exit(0); | ||
71 | } | ||
72 | }); | ||
73 | |||
74 | label = new Label("Statuszeile..."); | ||
75 | label.setFont(new Font("Helvetica", Font.PLAIN, 12)); | ||
76 | dasFenster.getContentPane().add(label,"North" ); | ||
77 | |||
78 | panel = new GraphicsWindowPanel(); | ||
79 | //panel.setBackground(Color.cyan); | ||
80 | panel.addCommand(new SetColor(activeColor)); | ||
81 | dasFenster.getContentPane().add(panel,"Center"); | ||
82 | mousePos = new Point(); | ||
83 | mouseListener = new MyMouseAdapter(); | ||
84 | panel.addMouseListener(mouseListener); | ||
85 | clear(); | ||
86 | dasFenster.setVisible(true); | ||
87 | } | ||
88 | |||
89 | /** | ||
90 | Gibt eine Zeichenkette oben im Fenster aus. | ||
91 | @param text diese Zeichenkette | ||
92 | */ | ||
93 | public void setText(String text) { | ||
94 | label.setText(text); | ||
95 | } | ||
96 | /** | ||
97 | Liest den oben im Fenster angezeigten Text aus. | ||
98 | @return den Text | ||
99 | */ | ||
100 | public String getText() { | ||
101 | return label.getText(); | ||
102 | } | ||
103 | /** | ||
104 | Wartet auf einen Mausklick. Die Methode blockiert das | ||
105 | aufrufende Programm solange bis der Mausklick erfolgt ist. | ||
106 | @return die Koordinaten des angeklickten Punkts | ||
107 | */ | ||
108 | |||
109 | public Point mouseClick() { | ||
110 | try{ | ||
111 | synchronized(mouseListener){mouseListener.wait();} | ||
112 | } | ||
113 | catch(InterruptedException e){ | ||
114 | e.printStackTrace(); | ||
115 | } | ||
116 | return mousePos; | ||
117 | } | ||
118 | |||
119 | class MyMouseAdapter extends MouseAdapter { | ||
120 | |||
121 | /** | ||
122 | Beendet das Warten auf den Mausklick und verwertet die Koordinaten. | ||
123 | Diese Methode ist nicht für den Anwender bestimmt. | ||
124 | */ | ||
125 | |||
126 | synchronized public void mouseClicked(MouseEvent e){ | ||
127 | mousePos = e.getPoint(); | ||
128 | notifyAll(); | ||
129 | } | ||
130 | } | ||
131 | |||
132 | |||
133 | /** | ||
134 | Schaltet die Zeichenfarbe auf die Hintergrundfarbe um. Dies ist | ||
135 | das Mittel, um gezeichnete Linien wieder zu löschen. | ||
136 | */ | ||
137 | public void switchToBackgroundColor(){ | ||
138 | activeColor = backColor; | ||
139 | panel.addCommand(new SwitchToBackgroundColor(activeColor)); | ||
140 | panel.repaint(); | ||
141 | } | ||
142 | |||
143 | /** | ||
144 | Schaltet die Zeichenfarbe auf Schwarz um. | ||
145 | */ | ||
146 | public void switchToForegroundColor(){ | ||
147 | activeColor = Color.BLACK; | ||
148 | panel.addCommand(new SetColor(activeColor)); | ||
149 | panel.repaint(); | ||
150 | } | ||
151 | |||
152 | |||
153 | /** Liefert die aktuelle Zeichenfarbe. | ||
154 | @return die aktuelle Zeichenfarbe des GraphicsWindow. */ | ||
155 | public Color getColor() { | ||
156 | // return panel.getGraphics().getColor(); // getGraphics() has unpleasant side-effects. :( | ||
157 | /* Fixed by adding another instance variable activeColor for now. */ | ||
158 | return activeColor; | ||
159 | } | ||
160 | |||
161 | /** | ||
162 | Zeichnet eine Linie in der aktuellen Zeichenfarbe. | ||
163 | @param x Anfangspunkt | ||
164 | @param y Endpunkt | ||
165 | */ | ||
166 | public void drawLine(Point x, Point y){ | ||
167 | // Odering points reduces the amount of graphical artifacts in rendering the same object in different ways | ||
168 | Point x1 = x; | ||
169 | Point y1 = y; | ||
170 | if ((x.x > y.x) || ((x.x == y.x) && (x.y > y.y))) { | ||
171 | x1 = y; | ||
172 | y1 = x; | ||
173 | } | ||
174 | panel.addCommand(new DrawLine(x1,y1)); | ||
175 | panel.repaint(); | ||
176 | } | ||
177 | |||
178 | /** | ||
179 | Zeichnet einen Punkt in der aktuellen Zeichenfarbe. | ||
180 | @param p Punkt | ||
181 | */ | ||
182 | public void drawPoint(Point p){ | ||
183 | drawLine(p, p); | ||
184 | } | ||
185 | |||
186 | /** | ||
187 | Zeichnet einen Punkt in der aktuellen Zeichenfarbe. | ||
188 | @param p Punkt | ||
189 | */ | ||
190 | public void drawStringAt(String s, Point p){ | ||
191 | Command c = new DrawString(s,p); | ||
192 | panel.addCommand(c); | ||
193 | panel.repaint(); | ||
194 | } | ||
195 | |||
196 | /** | ||
197 | Zeichnet ein geometrisches Objekt. | ||
198 | */ | ||
199 | public void draw(Shape s) { | ||
200 | panel.addCommand(new Draw(s)); | ||
201 | panel.repaint(); | ||
202 | } | ||
203 | |||
204 | /** | ||
205 | Füllt ein geometrisches Objekt aus. | ||
206 | */ | ||
207 | public void fill(Shape s) { | ||
208 | panel.addCommand(new Fill(s)); | ||
209 | panel.repaint(); | ||
210 | } | ||
211 | |||
212 | /** Das aufrufende Programm wird für ein gegebene Zeitspanne blockiert. | ||
213 | @param millis Die Zeitspanne in Millisekunden*/ | ||
214 | public void sleep(long millis) { | ||
215 | try {Thread.sleep(millis);} catch (Exception e){} | ||
216 | } | ||
217 | |||
218 | /** Setzt die Zeichenfarbe. */ | ||
219 | public void setColor(Color d) { | ||
220 | activeColor = d; | ||
221 | panel.addCommand(new SetColor(activeColor)); | ||
222 | panel.repaint(); | ||
223 | } | ||
224 | |||
225 | /** | ||
226 | Setzt die Zeichenfarbe auf einen Grauwert | ||
227 | @param shade Grauwert zwischen 0(schwarz) und 255(weiß) | ||
228 | */ | ||
229 | public void setGrayColor(int shade) { | ||
230 | setColor(new Color(shade, shade, shade)); | ||
231 | } | ||
232 | |||
233 | /** | ||
234 | Setzt die Zeichenfarbe für die Mandelbrot-Aufgabe | ||
235 | @param n Anzahl der Iterationen, die durch die Farbe symboliziert werdem soll | ||
236 | */ | ||
237 | public void setMandelColor(int n) { | ||
238 | float r = (float) Math.min(1.0,((double) n / 9.0) ); | ||
239 | float g = (float) Math.min(1.0,((double) n / 99.0) ); | ||
240 | float b = (float) Math.min(1.0,((double) n / 999.0) ); | ||
241 | setColor(new Color(r, g, b)); | ||
242 | } | ||
243 | |||
244 | /** Löscht das Bild */ | ||
245 | public void clear() { | ||
246 | Color oldActive = activeColor; | ||
247 | panel.clearAll(); | ||
248 | this.switchToBackgroundColor(); | ||
249 | fill(new Rectangle(0,0,width,height)); | ||
250 | setColor(oldActive); | ||
251 | } | ||
252 | |||
253 | public void killIn(int secs) { | ||
254 | Timer t = new Timer(1000*secs, new ActionListener(){ | ||
255 | @Override | ||
256 | public void actionPerformed(ActionEvent e) {dasFenster.dispose();} | ||
257 | } | ||
258 | ); | ||
259 | t.setRepeats(false); | ||
260 | t.start(); | ||
261 | } | ||
262 | } | ||
263 | |||
264 | |||
265 | class GraphicsWindowPanel extends JPanel | ||
266 | { | ||
267 | private static final long serialVersionUID = 1L; | ||
268 | private ArrayList<Command> cl = new ArrayList<Command>(); | ||
269 | |||
270 | public void paintComponent(Graphics g) | ||
271 | { | ||
272 | super.paintComponent(g); | ||
273 | Graphics2D g2D = (Graphics2D)g; | ||
274 | |||
275 | ArrayList<Command> cl = this.cl; // Kopie wegen Nebenläufigkeit von Swing | ||
276 | int size = cl.size(); | ||
277 | for (int i=0; i<size; i++) { | ||
278 | Command c = cl.get(i); | ||
279 | if (c != null) c.execute(g2D); | ||
280 | } | ||
281 | } | ||
282 | |||
283 | void addCommand(Command c) | ||
284 | { | ||
285 | cl.add(c); | ||
286 | } | ||
287 | |||
288 | void clearAll() | ||
289 | { | ||
290 | // try { | ||
291 | // SwingUtilities.invokeAndWait(new Runnable() { | ||
292 | // @Override | ||
293 | // public void run() { | ||
294 | cl = new ArrayList<Command>(); | ||
295 | // } | ||
296 | // }); | ||
297 | // } catch (InterruptedException e) { | ||
298 | // // TODO Auto-generated catch block | ||
299 | // e.printStackTrace(); | ||
300 | // } catch (InvocationTargetException e) { | ||
301 | // // TODO Auto-generated catch block | ||
302 | // e.printStackTrace(); | ||
303 | // } | ||
304 | } | ||
305 | } | ||
306 | |||
307 | |||
308 | abstract class Command //implements Serializable | ||
309 | { | ||
310 | abstract void execute(Graphics2D g2D); | ||
311 | |||
312 | /** Clone a shape. This method is needed because Shape | ||
313 | * does not define clone(), although many shape classes do. | ||
314 | * Kopiert aus jsky-2.6 auf ftp.eso.org */ | ||
315 | static Shape cloneShape(Shape s) { | ||
316 | // FIXME Add more specific shapes | ||
317 | if (s instanceof RectangularShape) { | ||
318 | return (RectangularShape) ((RectangularShape) s).clone(); | ||
319 | } else { | ||
320 | return new GeneralPath(s); | ||
321 | } | ||
322 | } | ||
323 | |||
324 | } | ||
325 | |||
326 | class DrawLine extends Command { | ||
327 | Point von; | ||
328 | Point bis; | ||
329 | DrawLine(Point von, Point bis) { | ||
330 | /* Clonen der Punkte essentiell um Aliasingeffekte beim Redraw zu verhindern */ | ||
331 | this.von = new Point(von); | ||
332 | this.bis = new Point(bis); | ||
333 | } | ||
334 | void execute(Graphics2D g2D) | ||
335 | { | ||
336 | g2D.drawLine(this.von.x,this.von.y,this.bis.x,this.bis.y); | ||
337 | } | ||
338 | } | ||
339 | |||
340 | class SwitchToForegroundColor extends Command { | ||
341 | SwitchToForegroundColor() {} | ||
342 | void execute(Graphics2D g2D) { | ||
343 | g2D.setColor(Color.black); | ||
344 | } | ||
345 | } | ||
346 | |||
347 | class SwitchToBackgroundColor extends Command { | ||
348 | Color backcolor; | ||
349 | SwitchToBackgroundColor(Color backcolor) {this.backcolor = backcolor;} | ||
350 | void execute(Graphics2D g2D) { | ||
351 | g2D.setColor(backcolor); | ||
352 | } | ||
353 | } | ||
354 | |||
355 | class SetColor extends Command { | ||
356 | Color color; | ||
357 | SetColor(Color color) {this.color = color;} | ||
358 | void execute(Graphics2D g2D) { | ||
359 | g2D.setColor(this.color); | ||
360 | } | ||
361 | } | ||
362 | |||
363 | |||
364 | class Draw extends Command { | ||
365 | Shape shape; | ||
366 | Draw(Shape shape) {this.shape = cloneShape(shape);} | ||
367 | void execute(Graphics2D g2D) { | ||
368 | g2D.draw(this.shape); | ||
369 | } | ||
370 | } | ||
371 | |||
372 | class Fill extends Command { | ||
373 | Shape shape; | ||
374 | Fill(Shape shape) {this.shape = cloneShape(shape);} | ||
375 | void execute(Graphics2D g2D) { | ||
376 | g2D.fill(this.shape); | ||
377 | } | ||
378 | } | ||
379 | |||
380 | class DrawString extends Command { | ||
381 | String string; | ||
382 | Point position; | ||
383 | DrawString(String string, Point position) {this.string = string; this.position = position;} | ||
384 | @Override | ||
385 | void execute(Graphics2D g2D) { | ||
386 | g2D.drawString(string, position.x, position.y); | ||
387 | } | ||
388 | } | ||
389 | |||
390 | |||
391 | |||
392 | |||
393 | |||
394 | |||
395 | |||
396 | |||
397 | |||
diff --git a/ws2015/eip/blaetter/04/VorlageDemo.java b/ws2015/eip/blaetter/04/VorlageDemo.java new file mode 100644 index 0000000..8c724b3 --- /dev/null +++ b/ws2015/eip/blaetter/04/VorlageDemo.java | |||
@@ -0,0 +1,21 @@ | |||
1 | import java.awt.Rectangle; | ||
2 | |||
3 | public class VorlageDemo { | ||
4 | |||
5 | public static void main(String[] args) { | ||
6 | int margin = 25; | ||
7 | int box_height = 50; | ||
8 | int box_width = 150; | ||
9 | Rectangle r1 = new Rectangle(margin, margin + box_width, | ||
10 | box_width, box_height); | ||
11 | GraphicsWindow gw = new GraphicsWindow(); | ||
12 | gw.fill(r1); | ||
13 | |||
14 | // ... TODO ... | ||
15 | |||
16 | gw.setText("Klicken Sie zum Beenden."); | ||
17 | gw.mouseClick(); | ||
18 | System.exit(0); | ||
19 | } | ||
20 | |||
21 | } | ||