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1 package snow.utils.gui;
2
3 import java.util.*;
4 import java.awt.*;
5 import java.awt.geom.*;
6 import javax.swing.*;
7
8 public class SnowBackgroundPanel extends JPanel
9 {
10 final SnowIcon snowIcon = new SnowIcon(55,55); int numberOfFlocks = 5;
12 double[] posX, posY, sizes;
13
14 public boolean highContrast = false;
15
16 public SnowBackgroundPanel()
17 {
18 this(new BorderLayout());
19 }
20 public SnowBackgroundPanel(LayoutManager lm)
21 {
22 super(lm);
23 }
24
25 int widthForFlocks = 0;
27
28 private void createFlocksPositions()
29 {
30 posX = new double[numberOfFlocks];
31 posY = new double[numberOfFlocks];
32 sizes = new double[numberOfFlocks];
33 widthForFlocks = this.getWidth();
34
35 for(int i=0; i<this.numberOfFlocks; i++)
36 {
37 sizes[i] = Math.random() * Math.max(widthForFlocks, getHeight())/3.7+0.01;
38
39 posX[i] = Math.random()*widthForFlocks-sizes[i]/2;
40 posY[i] = Math.random()*getHeight()-sizes[i]/2;
41 }
42
43 }
44
45 long calls = 0;
46
47
50 private void letSnowFall()
51 {
52 if(!SwingUtilities.isEventDispatchThread())
53 {
54 throw new RuntimeException  ("Must be called in the EDT");
55 }
56 calls++;
57
58 widthForFlocks = this.getWidth();
59 if(widthForFlocks != this.getWidth() || posX==null)
60 {
61 createFlocksPositions();
62 }
63
65 for(int i=0; i<this.numberOfFlocks; i++)
66 {
67
68 posX[i] += widthForFlocks*0.0008*Math.random();
69 posY[i] += widthForFlocks*0.0009*Math.random();
70
71 if(calls%500>250)
72 {
73 sizes[i] += (Math.random())*widthForFlocks/480.0;
74 }
75 else
76 {
77 sizes[i] -= (Math.random())*widthForFlocks/480.0;
78 }
79
80 if(sizes[i]<widthForFlocks/100)
81 {
82 sizes[i] = widthForFlocks/100;
83 }
84
85 if(sizes[i]>widthForFlocks/2)
86 {
87 sizes[i] = widthForFlocks/2;
88 }
89
90
91 if((posX[i]-sizes[i])>widthForFlocks)
92 {
93 posX[i] = -sizes[i];
94 }
95
96 if((posY[i]-sizes[i])>this.getHeight())
97 {
98 posY[i] = -sizes[i];
99 }
100
101 }
102
103
104 }
105
106
107
108
111 public void paint( Graphics g )
112 {
113
116 Graphics2D graphics2D = (Graphics2D)g;
117 final Paint savePaint = graphics2D.getPaint();
118
119 int width = getWidth();
120 int height = getHeight();
121
122 if(width==0) width=1;
123 if(height==0) height=1;
124
125 int max = Math.max(width,height);
126
127 Color bgColor = UIManager.getColor("Panel.background");
128 Color destColor = null;
129
130 if(this.highContrast)
131 {
132 destColor = SnowBackgroundPanel.createMediumLighterOrDarkerColor(bgColor);
133 }
134 else
135 {
136 destColor = SnowBackgroundPanel.createSmallLighterOrDarkerColor(bgColor);
137 }
138
139 GradientPaint upperLeftGradientPaint =
140 new GradientPaint( 0f,0f,
141 bgColor,
142 (float)max*3.2f, (float)max*3.2f,
143 destColor);
144 graphics2D.setPaint( upperLeftGradientPaint );
145
146 graphics2D.fill( graphics2D.getClip() );
147
148 if(widthForFlocks != this.getWidth())
149 {
150 createFlocksPositions();
151 }
152
153 if(posX!=null)
154 {
155 for(int i=0; i<posX.length; i++)
156 {
157 snowIcon.paintSnowFlake(graphics2D, bgColor, destColor, posX[i], posY[i], sizes[i]);
158 }
159 }
160
161
162 graphics2D.setPaint( savePaint );
163 super.paintChildren(graphics2D);
164 }
166
167
168
169
173 public void update( Graphics g )
174 {
175 paint(g);
177 }
178
179 Animator animator = null;
180
181
182
184 public void startAnimation()
185 {
186 if(animator==null)
187 {
188 animator = new Animator();
189 animator.setPriority(Thread.MIN_PRIORITY);
190 animator.start();
191 }
192 }
193
194 public void stopAnimation()
195 {
196 if(animator!=null)
197 {
198 animator.stop = true;
199 animator = null;
200 }
201 }
202
203 class Animator extends Thread
204 {
205 public boolean stop;
206 public void run()
207 {
208 while(!stop)
209 {
210 try
211 {
212 Thread.sleep(150);
213 }
214 catch(Exception e) {}
215
216 EventQueue.invokeLater(new Runnable ()
217 {
218 public void run()
219 {
220 letSnowFall();
221 repaint();
222 }
223 });
224 }
225 }
226 }
227
228
229 public static Color createSmallLighterOrDarkerColor(Color bgColor)
230 {
231 int r = bgColor.getRed();
232 int g = bgColor.getGreen();
233 int b = bgColor.getBlue();
234
235 if(r>245&&g>245&&b>245)
236 {
237 r -=20;
238 g -=20;
239 b -=15; }
241 else
242 {
243 r +=15;
244 g +=15;
245 b +=20; }
247 if(r>255) r=255;
248 if(g>255) g=255;
249 if(b>255) b=255;
250
251 if(r<0) r=0;
252 if(g<0) g=0;
253 if(b<0) b=0;
254
255 return new Color(r,g,b);
256 }
257
258 public static Color createMediumLighterOrDarkerColor(Color bgColor)
259 {
260 int r = bgColor.getRed();
261 int g = bgColor.getGreen();
262 int b = bgColor.getBlue();
263
264 if(r>225&&g>225&&b>225)
265 {
266 r -=50;
267 g -=50;
268 b -=25; }
270 else
271 {
272 r +=50;
273 g +=50;
274 b +=25; }
276 if(r>255) r=255;
277 if(g>255) g=255;
278 if(b>255) b=255;
279
280 if(r<0) r=0;
281 if(g<0) g=0;
282 if(b<0) b=0;
283
284 return new Color(r,g,b);
285 }
286
287
288 public static void main(String [] aa)
289 {
290 JFrame frame = new JFrame();
291 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
292 frame.getContentPane().setLayout(new BorderLayout());
293 SnowBackgroundPanel snowBack = new SnowBackgroundPanel();
294 frame.getContentPane().add(snowBack, BorderLayout.CENTER);
295 frame.setSize(200,200);
296 frame.setVisible(true);
297
298 snowBack.startAnimation();
299
300 }
301
302
303 } |
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