很久很久以前的一个很流行的java Applet放烟花效果,当初移到android过,这次摸鱼时间翻译成js代码,用canvas实现
这么多年,终于能大致看懂这代码了,

已经实现透明效果,只需要给body弄个好看的背景图片就行,但需要主色为深色,看到的人谁有兴趣美化下,弄个背景加个声音啥的,不过没啥用就是的了,只是弄着好玩

谁要是弄得漂亮也给我看下,虽然我已经是个老头了,但也有一颗爱美的心

主要学到的是

1. js里面的各种Array,https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray

2. java中,像素数组一般用int数组,一个int表示一个像素, 而js中一般用Uint8数组,四个uint8表示一个像素,转换要考虑高低位的问题,  这里getPix setPix中的转换过程 可以省略掉,但年纪大了,懒了

【感谢GPT的大力相助】

index.html

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <meta charset="utf-8">
  5. <meta name="viewport" content="width=device-width,initial-scale=1.0">
  6. <title>烟花</title>
  7. <style>
  8. #mainCanvas{
  9. width: 800px;
  10. height: 600px;
  11. background-color: rgba(255, 255, 255, 0);
  12. position: absolute;
  13. top: 0;
  14. left: 0;
  15. }
  16. </style>
  17. <script src="fireworks.js"></script>
  18. </head>
  19. <body style="background: #000000 ;">
  20. <canvas ref="mainCanvas" id="mainCanvas" ></canvas>
  21. <script>
  22. var f=new Fireworks(mainCanvas);
  23. </script>
  24. </body>
  25. </html>

Fireworks.js

  1. class Fireworks{
  2. constructor(canvas) {
  3. //0xff000000前面的ff表示透明度,可以调小让背景图显示出来 不过这里没研究清楚
  4. this.alpha = 0xFF000000;
  5. this.fps = 12;
  6. this.canvas = canvas;
  7. this.width = 800;
  8. this.height = 600;
  9. this.size= this.width*this.height;
  10. //减2行,以免超出
  11. this.size2=this.size-this.width*2;
  12. this.canvas.width = this.width;
  13. this.canvas.height = this.height;
  14.  
  15. this.ctx = canvas.getContext('2d');
  16.  
  17. this.imageData = this.ctx.createImageData(this.width, this.height);
  18.  
  19. this.canvas.addEventListener("mousedown", this.onDown.bind(this));
  20. //最多烟花数量,炸一次算50个,也就是同时最多10个烟花在,
  21. this.bits=500;
  22. //炸开后的烟花数量
  23. this.bit_max=50;
  24. //炸开角度,但具体影响还不清楚
  25. this.ru = 50;
  26. this.rv = 50;
  27. //中心点
  28. this.m_centerX = Math.floor(this.width / 2);
  29. this.m_centerY = Math.floor(this.height / 2);
  30.  
  31. //实际图像数据 每四个位置表示一个像素 R G B A
  32. this.data=new ArrayBuffer(this.width*this.height*4);
  33. this.dataView = new DataView(this.data);
  34. //烟花计算数据
  35. this.bit_px = new Array(this.bits).fill(0);
  36. this.bit_py = new Array(this.bits).fill(0);
  37. this.bit_vx = new Array(this.bits).fill(0);
  38. this.bit_vy = new Array(this.bits).fill(0);
  39. this.bit_sx = new Int32Array(this.bits).fill(0);
  40. this.bit_sy = new Int32Array(this.bits).fill(0);
  41. this.bit_l = new Int32Array(this.bits).fill(0);
  42. this.bit_f = new Int32Array(this.bits).fill(0);
  43. this.bit_p = new Int32Array(this.bits).fill(0);
  44. this.bit_c = new Int32Array(this.bits).fill(0);
  45.  
  46. this.m_centerX = Math.floor(this.width / 2);
  47. this.m_centerY = Math.floor(this.height / 2);
  48.  
  49. this.initData();
  50. this.calculate();
  51. }
  52. initData(){
  53. //最开始的时候给弄透明了
  54. for(var i=0;i<this.size;i++){
  55. this.dataView.setUint32(i*4,0x00000000,true);
  56. }
  57. this.imageData.data.set(new Uint8ClampedArray(this.dataView.buffer));
  58. }
  59. onDown(event){
  60. this.m_mouseX = event.offsetX;
  61. this.m_mouseY = event.offsetY;
  62. let k = Math.floor(Math.random() * 256);
  63. let l = Math.floor(Math.random() * 256);
  64. let i1 = Math.floor(Math.random() * 256);
  65. let j1 = (k << 16) | (l << 8) | i1 | this.alpha;
  66. let k1 = 0;
  67. console.log(this.bits);
  68. console.log(this.bit_max);
  69. for (let l1 = 0; l1 < this.bits; l1++) {
  70.  
  71. if (this.bit_f[l1] !== 0) {
  72. continue;
  73. }
  74. this.bit_px[l1] = this.m_mouseX;
  75. this.bit_py[l1] = this.m_mouseY;
  76. let d = Math.random() * 6.2800000000000002;
  77. let d1 = Math.random();
  78. this.bit_vx[l1] = Math.sin(d) * d1;
  79. this.bit_vy[l1] = Math.cos(d) * d1;
  80. this.bit_l[l1] = Math.floor(Math.random() * 100) + 100;
  81. this.bit_p[l1] = Math.floor(Math.random() * 3);
  82. this.bit_c[l1] = j1;
  83. this.bit_sx[l1] = this.m_mouseX;
  84. this.bit_sy[l1] = this.height - 5;
  85. this.bit_f[l1] = 2;
  86. if (++k1 === this.bit_max) {
  87. break;
  88. }
  89. }
  90.  
  91. //这里播放开始声音
  92.  
  93. //这里尝试点击后修改一个像素点的颜色
  94. /* let pix=this.getPix(y*this.width+x);
  95. console.log(pix);
  96. this.setPix(y*this.width+x,0xffff00f0);
  97. this.imageData.data.set(new Uint8ClampedArray(this.dataView.buffer)); */
  98. }
  99. getPix(byteOffset){
  100. //获取像素点
  101. return this.dataView.getUint32(byteOffset*4, true);
  102. }
  103. setPix(byteOffset,val){
  104. this.dataView.setUint32(byteOffset*4,val,true);
  105. }
  106. bit_set(x,y,v){
  107. //设置像素点
  108. this.setPix(y * this.width + x,v);
  109. }
  110. fade(){
  111. //全图慢慢扩散和淡化
  112. for (let j = 0; j < this.size2; j++) {
  113. //取四个点
  114. const k = this.getPix(j);
  115. //最后会是黑色,所以如果一个点的值是黑色,就可以不运算了
  116. if(k==this.alpha){
  117. this.setPix(j,0x00000000);
  118. continue;
  119. }
  120. if(k==0x00000000){
  121. continue;
  122. }
  123. //右边
  124. const l = this.getPix(j+1);
  125. //下一行的点
  126. const i1 = this.getPix(j + this.width);
  127. //下一行右边
  128. const j1 = this.getPix(j + this.width + 1);
  129.  
  130. let i = (k & 0xff0000) >> 16;
  131. let k1 = ((((l & 0xff0000) >> 16) - i) * 50 >> 8) + i;
  132. i = (k & 0xff00) >> 8;
  133. let l1 = ((((l & 0xff00) >> 8) - i) * 50 >> 8) + i;
  134. i = k & 0xff;
  135. let i2 = (((l & 0xff) - i) * 50 >> 8) + i;
  136. i = (i1 & 0xff0000) >> 16;
  137. let j2 = ((((j1 & 0xff0000) >> 16) - i) * 50 >> 8) + i;
  138. i = (i1 & 0xff00) >> 8;
  139. let k2 = ((((j1 & 0xff00) >> 8) - i) * 50 >> 8) + i;
  140. i = i1 & 0xff;
  141. let l2 = (((j1 & 0xff) - i) * 50 >> 8) + i;
  142. let i3 = ((j2 - k1) * 50 >> 8) + k1;
  143. let j3 = ((k2 - l1) * 50 >> 8) + l1;
  144. let k3 = ((l2 - i2) * 50 >> 8) + i2;
  145. let val = (i3 << 16) | (j3 << 8) | k3 | this.alpha;
  146. this.setPix(j,val);
  147. }
  148.  
  149. }
  150. //计算烟花
  151. rend() {
  152.  
  153. let flag2 = false;
  154. for (let k = 0; k < this.bits; k++) {
  155. switch (this.bit_f[k]) {
  156. default:
  157. break;
  158. case 1:
  159. this.bit_vy[k] += Math.random() / 50;
  160. this.bit_px[k] += this.bit_vx[k];
  161. this.bit_py[k] += this.bit_vy[k];
  162. this.bit_l[k]--;
  163. if (this.bit_l[k] === 0 || this.bit_px[k] < 0.0 || this.bit_py[k] < 0.0 || this.bit_px[k] > this.width || this.bit_py[k] > this.height - 3) {
  164. this.bit_c[k] = this.alpha;
  165. this.bit_f[k] = 0;
  166. } else if (this.bit_p[k] === 0) {
  167. if (Math.floor(Math.random() * 2) === 0) {
  168. this.bit_set(Math.floor(this.bit_px[k]), Math.floor(this.bit_py[k]), -1);
  169. }
  170. } else {
  171. this.bit_set(Math.floor(this.bit_px[k]), Math.floor(this.bit_py[k]), this.bit_c[k]);
  172. }
  173. break;
  174.  
  175. case 2:
  176. //这里是飞行速度,
  177. this.bit_sy[k] -= 10;
  178. if (this.bit_sy[k] <= this.bit_py[k]) {
  179. this.bit_f[k] = 1;
  180. flag2 = true;
  181. }
  182. if (Math.floor(Math.random() * 20) === 0) {
  183. let i = Math.floor(Math.random() * 2);
  184. let j = Math.floor(Math.random() * 5);
  185. this.bit_set(this.bit_sx[k] + i, this.bit_sy[k] + j, -1);
  186. }
  187. break;
  188. }
  189. }
  190.  
  191. if (flag2 ) {
  192. //播放爆炸声音
  193. }
  194. }
  195.  
  196. calculate(){
  197. this.fade();
  198. this.rend();
  199. this.imageData.data.set(new Uint8ClampedArray(this.dataView.buffer));
  200.  
  201. this.ctx.putImageData(this.imageData,0,0);
  202. setTimeout(()=>{this.calculate()},50);
  203. }
  204.  
  205. }

  

原始java代码

  1.  
  2. import java.applet.Applet;
  3. import java.applet.AudioClip;
  4. import java.awt.*;
  5. import java.awt.image.MemoryImageSource;
  6. import java.util.Random;
  7.  
  8. @SuppressWarnings("serial")
  9. public class Test extends Applet implements Runnable {
  10. public static void main(String[]args){
  11. Test test=new Test();
  12. test.init();
  13.  
  14. }
  15. public Test() {
  16. m_mouseX = 0;
  17. m_mouseY = 0;
  18. m_sleepTime = 5;
  19. isError = false;
  20. isInitialized = false;
  21. rand = new Random();
  22. bits = 50;
  23. bit_px = new double[bits];
  24. bit_py = new double[bits];
  25. bit_vx = new double[bits];
  26. bit_vy = new double[bits];
  27. bit_sx = new int[bits];
  28. bit_sy = new int[bits];
  29. bit_l = new int[bits];
  30. bit_f = new int[bits];
  31. bit_p = new int[bits];
  32. bit_c = new int[bits];
  33. ru = 50;
  34. rv = 50;
  35. }
  36.  
  37. public void init() {
  38. String s ="50";
  39. if (s != null)
  40. bits = Integer.parseInt(s);
  41. s = "30";
  42. if (s != null)
  43. bit_max = Integer.parseInt(s);
  44. s = "20";
  45. if (s != null)
  46. ru = Integer.parseInt(s);
  47. s = "100";
  48. if (s != null)
  49. rv = Integer.parseInt(s);
  50. s ="0";
  51. if (s != null)
  52. bit_sound = Integer.parseInt(s);
  53. m_nAppX = getSize().width;
  54. m_nAppY = getSize().height;
  55. m_centerX = m_nAppX / 2;
  56. m_centerY = m_nAppY / 2;
  57. m_mouseX = m_centerX;
  58. m_mouseY = m_centerY;
  59. resize(m_nAppX, m_nAppY);
  60. pixls = m_nAppX * m_nAppY;
  61. pixls2 = pixls - m_nAppX * 2;
  62. pix0 = new int[pixls];
  63. offImage = new MemoryImageSource(m_nAppX, m_nAppY, pix0, 0, m_nAppX);
  64. offImage.setAnimated(true);
  65. dbImg = createImage(offImage);
  66. for (int i = 0; i < pixls; i++)
  67. pix0[i] = 0xff000000;
  68.  
  69. //sound1 = getAudioClip(getDocumentBase(), "firework.au");
  70. //sound2 = getAudioClip(getDocumentBase(), "syu.au");
  71. for (int j = 0; j < bits; j++)
  72. bit_f[j] = 0;
  73.  
  74. isInitialized = true;
  75. start();
  76. }
  77. private boolean stop;
  78.  
  79. public void run() {
  80. while (!isInitialized)
  81. try {
  82. Thread.sleep(200L);
  83. } catch (InterruptedException interruptedexception) {
  84. }
  85. do {
  86. for (int j = 0; j < pixls2; j++) {
  87. int k = pix0[j];
  88. int l = pix0[j + 1];
  89. int i1 = pix0[j + m_nAppX];
  90. int j1 = pix0[j + m_nAppX + 1];
  91. int i = (k & 0xff0000) >> 16;
  92. int k1 = ((((l & 0xff0000) >> 16) - i) * ru >> 8) + i;
  93. i = (k & 0xff00) >> 8;
  94. int l1 = ((((l & 0xff00) >> 8) - i) * ru >> 8) + i;
  95. i = k & 0xff;
  96. int i2 = (((l & 0xff) - i) * ru >> 8) + i;
  97. i = (i1 & 0xff0000) >> 16;
  98. int j2 = ((((j1 & 0xff0000) >> 16) - i) * ru >> 8) + i;
  99. i = (i1 & 0xff00) >> 8;
  100. int k2 = ((((j1 & 0xff00) >> 8) - i) * ru >> 8) + i;
  101. i = i1 & 0xff;
  102. int l2 = (((j1 & 0xff) - i) * ru >> 8) + i;
  103. int i3 = ((j2 - k1) * rv >> 8) + k1;
  104. int j3 = ((k2 - l1) * rv >> 8) + l1;
  105. int k3 = ((l2 - i2) * rv >> 8) + i2;
  106. pix0[j] = i3 << 16 | j3 << 8 | k3 | 0xff000000;
  107. }
  108.  
  109. rend();
  110. offImage.newPixels(0, 0, m_nAppX, m_nAppY);
  111. try {
  112. Thread.sleep(m_sleepTime);
  113. } catch (InterruptedException interruptedexception1) {
  114. }
  115. } while (!stop);
  116. }
  117.  
  118. public void update(Graphics g) {
  119. paint(g);
  120. }
  121.  
  122. public void paint(Graphics g) {
  123. g.drawImage(dbImg, 0, 0, this);
  124. }
  125.  
  126. public void start() {
  127. if (isError)
  128. return;
  129. isRunning = true;
  130. if (runner == null) {
  131. runner = new Thread(this);
  132. runner.start();
  133. }
  134. }
  135.  
  136. @SuppressWarnings("deprecation")
  137. public void stop() {
  138. if (runner != null) {
  139. runner.stop();
  140. runner = null;
  141. }
  142. }
  143.  
  144. public boolean mouseMove(Event event, int i, int j) {
  145. m_mouseX = i;
  146. m_mouseY = j;
  147. return true;
  148. }
  149.  
  150. public boolean mouseDown(Event event, int i, int j) {
  151. m_mouseX = i;
  152. m_mouseY = j;
  153. int k = (int) (rand.nextDouble() * 256D);
  154. int l = (int) (rand.nextDouble() * 256D);
  155. int i1 = (int) (rand.nextDouble() * 256D);
  156. int j1 = k << 16 | l << 8 | i1 | 0xff000000;
  157. int k1 = 0;
  158. for (int l1 = 0; l1 < bits; l1++) {
  159. if (bit_f[l1] != 0)
  160. continue;
  161. bit_px[l1] = m_mouseX;
  162. bit_py[l1] = m_mouseY;
  163. double d = rand.nextDouble() * 6.2800000000000002D;
  164. double d1 = rand.nextDouble();
  165. bit_vx[l1] = Math.sin(d) * d1;
  166. bit_vy[l1] = Math.cos(d) * d1;
  167. bit_l[l1] = (int) (rand.nextDouble() * 100D) + 100;
  168. bit_p[l1] = (int) (rand.nextDouble() * 3D);
  169. bit_c[l1] = j1;
  170. bit_sx[l1] = m_mouseX;
  171. bit_sy[l1] = m_nAppY - 5;
  172. bit_f[l1] = 2;
  173. if (++k1 == bit_max)
  174. break;
  175. }
  176.  
  177. if (bit_sound > 1)
  178. sound2.play();
  179. return true;
  180. }
  181.  
  182. public boolean mouseExit(Event event, int i, int j) {
  183. m_mouseX = i;
  184. m_mouseY = j;
  185. return true;
  186. }
  187.  
  188. // (JAVA世纪网,java2000.net)
  189. void rend() {
  190. boolean flag2 = false;
  191. for (int k = 0; k < bits; k++)
  192. switch (bit_f[k]) {
  193. default:
  194. break;
  195.  
  196. case 1: // '\001'
  197. bit_vy[k] += rand.nextDouble() / 50D;
  198. bit_px[k] += bit_vx[k];
  199. bit_py[k] += bit_vy[k];
  200. bit_l[k]--;
  201. if (bit_l[k] == 0 || bit_px[k] < 0.0D || bit_py[k] < 0.0D || bit_px[k] > (double) m_nAppX
  202. || bit_py[k] > (double) (m_nAppY - 3)) {
  203. bit_c[k] = 0xff000000;
  204. bit_f[k] = 0;
  205. } else if (bit_p[k] == 0) {
  206. if ((int) (rand.nextDouble() * 2D) == 0)
  207. bit_set((int) bit_px[k], (int) bit_py[k], -1);
  208. } else {
  209. bit_set((int) bit_px[k], (int) bit_py[k], bit_c[k]);
  210. }
  211. break;
  212.  
  213. case 2: // '\002'
  214. bit_sy[k] -= 5;
  215. if ((double) bit_sy[k] <= bit_py[k]) {
  216. bit_f[k] = 1;
  217. flag2 = true;
  218. }
  219. if ((int) (rand.nextDouble() * 20D) == 0) {
  220. int i = (int) (rand.nextDouble() * 2D);
  221. int j = (int) (rand.nextDouble() * 5D);
  222. bit_set(bit_sx[k] + i, bit_sy[k] + j, -1);
  223. }
  224. break;
  225. }
  226.  
  227. if (flag2 && bit_sound > 0)
  228. sound1.play();
  229. }
  230.  
  231. void bit_set(int i, int j, int k) {
  232. int l = i + j * m_nAppX;
  233. pix0[l] = k;
  234. }
  235.  
  236. private int m_nAppX;
  237. private int m_nAppY;
  238. private int m_centerX;
  239. private int m_centerY;
  240. private int m_mouseX;
  241. private int m_mouseY;
  242. private int m_sleepTime;
  243. private boolean isError;
  244. boolean isRunning;
  245. boolean isInitialized;
  246. Thread runner;
  247. int pix0[];
  248. MemoryImageSource offImage;
  249. Image dbImg;
  250. int pixls;
  251. int pixls2;
  252. Random rand;
  253. int bits;
  254. double bit_px[];
  255. double bit_py[];
  256. double bit_vx[];
  257. double bit_vy[];
  258. int bit_sx[];
  259. int bit_sy[];
  260. int bit_l[];
  261. int bit_f[];
  262. int bit_p[];
  263. int bit_c[];
  264. int bit_max;
  265. int bit_sound;
  266. int ru;
  267. int rv;
  268. AudioClip sound1;
  269. AudioClip sound2;
  270. }

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