Go语言视频零基础入门到精通

javalearner

1.      [img]http://img.javaxxz.com/2014/11/5/000234953.gif[/img]
4. import java.awt.*;
   
5. import java.applet.*;
   
6. import java.awt.event.*;
   
7. public class C extends Applet implements MouseListener, MouseMotionListener{
   
8.   private final int MAX = 256;
   
9.   private final double SX = -1.0; // 实部的最小值
   
10.   private final double SY = -1.5; // 虚部的最小值
    
11.   private final double EX = 2.0; // 实部的最大值
    
12.   private final double EY = 1.5; // 虚部的最大值
    
13.   private static int picX, picY, xs, ys, xe, ye;
    
14.   private static double x1, y1, x2, y2, p, q,xb,yb;
    
15.   private static boolean action, rechteck, fertig, stopit;
    
16.   private static float xy;
    
17.   private Image bild;
    
18.   private Graphics g1;
    
19.   private Cursor c1, c2;
    
20. public void init() // 初始化所有实例
    
21. {
    
22.   p = -0.46;
    
23.   q = 0.57;
    
24.   fertig = false;
    
25.   addMouseListener(this);
    
26.   addMouseMotionListener(this);
    
27.   c1 = new Cursor(Cursor.WAIT_CURSOR);
    
28.   c2 = new Cursor(Cursor.CROSSHAIR_CURSOR);
    
29.   picX = getSize().width;
    
30.   picY = getSize().height;
    
31.   xy = (float)picX / (float)picY;
    
32.   bild = createImage(picX, picY);
    
33.   g1 = bild.getGraphics();
    
34.   fertig = true;
    
35. }
    

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1. 
   
2. public void destroy() // 删除所有实例
   
3. {
   
4.   if (fertig){
   
5.    removeMouseListener(this);
   
6.    removeMouseMotionListener(this);
   
7.    bild = null;
   
8.    g1 = null;
   
9.    c1 = null;
   
10.    c2 = null;
    
11.    System.gc();
    
12.   }
    
13. }
    
14. public void start(){
    
15. action = false;
    
16. rechteck = false;
    
17. stopit = false;
    
18. startwerte();
    
19. xb = (x2 - x1) / (double)picX;
    
20. yb = (y2 - y1) / (double)picY;
    
21. julia();
    
22. }
23. 
    
24. public void stop(){
    
25. }
    
26. public void paint(Graphics g)
    
27. {
    
28.   update(g);
    
29. }
    
30. public void update(Graphics g)
    
31. {
    
32.   g.drawImage(bild, 0, 0, this);
    
33.   if (rechteck){
    
34.     g.setColor(Color.white);
    
35.     if (xs < xe){
    
36.       if (ys < ye) g.drawRect(xs, ys, (xe - xs), (ye - ys));
    
37.       else g.drawRect(xs, ye, (xe - xs), (ys - ye));
    
38.     }else{
    
39.       if (ys < ye) g.drawRect(xe, ys, (xs - xe), (ye - ys));
    
40.       else g.drawRect(xe, ye, (xs - xe), (ys - ye));
    
41.     }
    
42.   }
    
43. }
    
44. private void julia() // 计算所有的点
    
45. {
    
46.   int x, y;
    
47.   float h, b, alt = 0.0f;
    
48.   action = false;
    
49.   setCursor(c1);
    
50.   showStatus("正在计算julia集，请等待...");
    
51.    p = -0.46;
    
52.    q = 0.57;
    
53.    for (x = 0; x < picX; x+=2) {
    
54.     for (y = 0; y < picY; y++){
    
55.       h = punktfarbe(x1 + xb * (double)x, y1 + yb * (double)y,p,q); // 颜色值
    
56.       if (h != alt){
    
57.        b = 1.0f - h * h;
    
58.        g1.setColor(Color.getHSBColor( h,1,b));
    
59.        alt = h;
    
60.       }
    
61.       g1.drawLine(x, y, x + 1, y);
    
62.    }
    
63.      showStatus( "At " + x + " of " + picX );
    
64.    if (stopit) x = picX;
    
65. }
    
66. if (stopit) {
    
67.   showStatus("Aborted");
    
68.   stopit = false;
    
69. } else {
    
70.   showStatus("julia集已准备好，请用鼠标选择放大区域.");
    
71. }
    
72.   setCursor(c2);
    
73.   action = true;
    
74. }
    
75. // 由迭代产生的0.0到1.0的颜色值
    
76. private float punktfarbe(double x0, double y0,double p,double q)
    
77. {
    
78.    double r = 0.0, xk = 0, yk = 0;
    
79.    int j = 0;
    
80.   while ((j < MAX) && (r < 4.0)){
    
81.     xk = x0 * x0 - y0 * y0 + p;
    
82.     yk = 2.0 * x0 * y0 + q;
    
83.     j++;
    
84.     r = yk * yk + xk * xk;
    
85.     x0 = xk;
    
86.     y0 = yk;
    
87.    }
    
88.   return (float)j / (float)MAX;
    
89. }
    
90. private void startwerte() // 重新开始值
    
91. {
    
92.   x1 = SX;
    
93.   y1 = SY;
    
94.   x2 = EX;
    
95.   y2 = EY;
    
96.   if ((float)((x2 - x1) / (y2 - y1)) != xy )
    
97.     x1 = x2 - (y2 - y1) * (double)xy;
    
98.   }
    
99.   
    
100. public void mousePressed(MouseEvent e)
     
101. {
     
102.   e.consume();
     
103.   if (action){
     
104.     xs = e.getX();
     
105.     ys = e.getY();
     
106.   }
     
107. }
     
108. public void mouseReleased(MouseEvent e)
     
109. {
     
110.   int z, w;
     
111.   e.consume();
     
112.   if (action){
     
113.     xe = e.getX();
     
114.     ye = e.getY();
     
115.     if (xs > xe){
     
116.       z = xs;
     
117.       xs = xe;
     
118.       xe = z;
     
119.     }
     
120.    if (ys > ye){
     
121.     z = ys;
     
122.     ys = ye;
     
123.     ye = z;
     
124.    }
     
125.    w = (xe - xs);
     
126.    z = (ye - ys);
     
127.    if ((w < 2) && (z < 2)) startwerte();
     
128.    else{
     
129.     if (((float)w > (float)z * xy)) ye = (int)((float)ys + (float)w / xy);
     
130.     else xe = (int)((float)xs + (float)z * xy);
     
131.     x2 = x1 + xb* (double)xe;
     
132.     y2 = y1 + yb * (double)ye;
     
133.     x1 += xb * (double)xs;
     
134.     y1 += yb * (double)ys;
     
135.    }
     
136.    xb = (x2 - x1) / (double)picX;
     
137.    yb = (y2 - y1) / (double)picY;
     
138.    julia();
     
139.    rechteck = false;
     
140.    repaint();
     
141.   } else {
     
142.    stopit = true;
     
143.   }
     
144. }
     
145. public void mouseEntered(MouseEvent e)
     
146. {
     
147. }
     
148. public void mouseExited(MouseEvent e)
     
149. {
     
150. }
     
151. public void mouseClicked(MouseEvent e)
     
152. {
     
153. }
     
154. public void mouseDragged(MouseEvent e)
     
155. {
     
156.   e.consume();
     
157.   if (action){
     
158.     xe = e.getX();
     
159.     ye = e.getY();
     
160.     rechteck = true;
     
161.     repaint();
     
162.    }
     
163. }
     
164. public void mouseMoved(MouseEvent e)
     
165. {
     
166. }
     
167. }

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源码下载：http://file.javaxxz.com/2014/11/5/000235000.zip