H5用canvas放烟花
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
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width,initial-scale=1.0">
- <title>烟花</title>
- <style>
- #mainCanvas{
- width: 800px;
- height: 600px;
- background-color: rgba(255, 255, 255, 0);
- position: absolute;
- top: 0;
- left: 0;
- }
- </style>
- <script src="fireworks.js"></script>
- </head>
- <body style="background: #000000 ;">
- <canvas ref="mainCanvas" id="mainCanvas" ></canvas>
- <script>
- var f=new Fireworks(mainCanvas);
- </script>
- </body>
- </html>
Fireworks.js
- class Fireworks{
- constructor(canvas) {
- //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
- this.alpha = 0xFF000000;
- this.fps = 12;
- this.canvas = canvas;
- this.width = 800;
- this.height = 600;
- this.size= this.width*this.height;
- //减2行,以免超出
- this.size2=this.size-this.width*2;
- this.canvas.width = this.width;
- this.canvas.height = this.height;
- this.ctx = canvas.getContext('2d');
- this.imageData = this.ctx.createImageData(this.width, this.height);
- this.canvas.addEventListener("mousedown", this.onDown.bind(this));
- //最多烟花数量,炸一次算50个,也就是同时最多10个烟花在,
- this.bits=500;
- //炸开后的烟花数量
- this.bit_max=50;
- //炸开角度,但具体影响还不清楚
- this.ru = 50;
- this.rv = 50;
- //中心点
- this.m_centerX = Math.floor(this.width / 2);
- this.m_centerY = Math.floor(this.height / 2);
- //实际图像数据 每四个位置表示一个像素 R G B A
- this.data=new ArrayBuffer(this.width*this.height*4);
- this.dataView = new DataView(this.data);
- //烟花计算数据
- this.bit_px = new Array(this.bits).fill(0);
- this.bit_py = new Array(this.bits).fill(0);
- this.bit_vx = new Array(this.bits).fill(0);
- this.bit_vy = new Array(this.bits).fill(0);
- this.bit_sx = new Int32Array(this.bits).fill(0);
- this.bit_sy = new Int32Array(this.bits).fill(0);
- this.bit_l = new Int32Array(this.bits).fill(0);
- this.bit_f = new Int32Array(this.bits).fill(0);
- this.bit_p = new Int32Array(this.bits).fill(0);
- this.bit_c = new Int32Array(this.bits).fill(0);
- this.m_centerX = Math.floor(this.width / 2);
- this.m_centerY = Math.floor(this.height / 2);
- this.initData();
- this.calculate();
- }
- initData(){
- //最开始的时候给弄透明了
- for(var i=0;i<this.size;i++){
- this.dataView.setUint32(i*4,0x00000000,true);
- }
- this.imageData.data.set(new Uint8ClampedArray(this.dataView.buffer));
- }
- onDown(event){
- this.m_mouseX = event.offsetX;
- this.m_mouseY = event.offsetY;
- let k = Math.floor(Math.random() * 256);
- let l = Math.floor(Math.random() * 256);
- let i1 = Math.floor(Math.random() * 256);
- let j1 = (k << 16) | (l << 8) | i1 | this.alpha;
- let k1 = 0;
- console.log(this.bits);
- console.log(this.bit_max);
- for (let l1 = 0; l1 < this.bits; l1++) {
- if (this.bit_f[l1] !== 0) {
- continue;
- }
- this.bit_px[l1] = this.m_mouseX;
- this.bit_py[l1] = this.m_mouseY;
- let d = Math.random() * 6.2800000000000002;
- let d1 = Math.random();
- this.bit_vx[l1] = Math.sin(d) * d1;
- this.bit_vy[l1] = Math.cos(d) * d1;
- this.bit_l[l1] = Math.floor(Math.random() * 100) + 100;
- this.bit_p[l1] = Math.floor(Math.random() * 3);
- this.bit_c[l1] = j1;
- this.bit_sx[l1] = this.m_mouseX;
- this.bit_sy[l1] = this.height - 5;
- this.bit_f[l1] = 2;
- if (++k1 === this.bit_max) {
- break;
- }
- }
- //这里播放开始声音
- //这里尝试点击后修改一个像素点的颜色
- /* let pix=this.getPix(y*this.width+x);
- console.log(pix);
- this.setPix(y*this.width+x,0xffff00f0);
- this.imageData.data.set(new Uint8ClampedArray(this.dataView.buffer)); */
- }
- getPix(byteOffset){
- //获取像素点
- return this.dataView.getUint32(byteOffset*4, true);
- }
- setPix(byteOffset,val){
- this.dataView.setUint32(byteOffset*4,val,true);
- }
- bit_set(x,y,v){
- //设置像素点
- this.setPix(y * this.width + x,v);
- }
- fade(){
- //全图慢慢扩散和淡化
- for (let j = 0; j < this.size2; j++) {
- //取四个点
- const k = this.getPix(j);
- //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
- if(k==this.alpha){
- this.setPix(j,0x00000000);
- continue;
- }
- if(k==0x00000000){
- continue;
- }
- //右边
- const l = this.getPix(j+1);
- //下一行的点
- const i1 = this.getPix(j + this.width);
- //下一行右边
- const j1 = this.getPix(j + this.width + 1);
- let i = (k & 0xff0000) >> 16;
- let k1 = ((((l & 0xff0000) >> 16) - i) * 50 >> 8) + i;
- i = (k & 0xff00) >> 8;
- let l1 = ((((l & 0xff00) >> 8) - i) * 50 >> 8) + i;
- i = k & 0xff;
- let i2 = (((l & 0xff) - i) * 50 >> 8) + i;
- i = (i1 & 0xff0000) >> 16;
- let j2 = ((((j1 & 0xff0000) >> 16) - i) * 50 >> 8) + i;
- i = (i1 & 0xff00) >> 8;
- let k2 = ((((j1 & 0xff00) >> 8) - i) * 50 >> 8) + i;
- i = i1 & 0xff;
- let l2 = (((j1 & 0xff) - i) * 50 >> 8) + i;
- let i3 = ((j2 - k1) * 50 >> 8) + k1;
- let j3 = ((k2 - l1) * 50 >> 8) + l1;
- let k3 = ((l2 - i2) * 50 >> 8) + i2;
- let val = (i3 << 16) | (j3 << 8) | k3 | this.alpha;
- this.setPix(j,val);
- }
- }
- //计算烟花
- rend() {
- let flag2 = false;
- for (let k = 0; k < this.bits; k++) {
- switch (this.bit_f[k]) {
- default:
- break;
- case 1:
- this.bit_vy[k] += Math.random() / 50;
- this.bit_px[k] += this.bit_vx[k];
- this.bit_py[k] += this.bit_vy[k];
- this.bit_l[k]--;
- 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) {
- this.bit_c[k] = this.alpha;
- this.bit_f[k] = 0;
- } else if (this.bit_p[k] === 0) {
- if (Math.floor(Math.random() * 2) === 0) {
- this.bit_set(Math.floor(this.bit_px[k]), Math.floor(this.bit_py[k]), -1);
- }
- } else {
- this.bit_set(Math.floor(this.bit_px[k]), Math.floor(this.bit_py[k]), this.bit_c[k]);
- }
- break;
- case 2:
- //这里是飞行速度,
- this.bit_sy[k] -= 10;
- if (this.bit_sy[k] <= this.bit_py[k]) {
- this.bit_f[k] = 1;
- flag2 = true;
- }
- if (Math.floor(Math.random() * 20) === 0) {
- let i = Math.floor(Math.random() * 2);
- let j = Math.floor(Math.random() * 5);
- this.bit_set(this.bit_sx[k] + i, this.bit_sy[k] + j, -1);
- }
- break;
- }
- }
- if (flag2 ) {
- //播放爆炸声音
- }
- }
- calculate(){
- this.fade();
- this.rend();
- this.imageData.data.set(new Uint8ClampedArray(this.dataView.buffer));
- this.ctx.putImageData(this.imageData,0,0);
- setTimeout(()=>{this.calculate()},50);
- }
- }
原始java代码
- import java.applet.Applet;
- import java.applet.AudioClip;
- import java.awt.*;
- import java.awt.image.MemoryImageSource;
- import java.util.Random;
- @SuppressWarnings("serial")
- public class Test extends Applet implements Runnable {
- public static void main(String[]args){
- Test test=new Test();
- test.init();
- }
- public Test() {
- m_mouseX = 0;
- m_mouseY = 0;
- m_sleepTime = 5;
- isError = false;
- isInitialized = false;
- rand = new Random();
- bits = 50;
- bit_px = new double[bits];
- bit_py = new double[bits];
- bit_vx = new double[bits];
- bit_vy = new double[bits];
- bit_sx = new int[bits];
- bit_sy = new int[bits];
- bit_l = new int[bits];
- bit_f = new int[bits];
- bit_p = new int[bits];
- bit_c = new int[bits];
- ru = 50;
- rv = 50;
- }
- public void init() {
- String s ="50";
- if (s != null)
- bits = Integer.parseInt(s);
- s = "30";
- if (s != null)
- bit_max = Integer.parseInt(s);
- s = "20";
- if (s != null)
- ru = Integer.parseInt(s);
- s = "100";
- if (s != null)
- rv = Integer.parseInt(s);
- s ="0";
- if (s != null)
- bit_sound = Integer.parseInt(s);
- m_nAppX = getSize().width;
- m_nAppY = getSize().height;
- m_centerX = m_nAppX / 2;
- m_centerY = m_nAppY / 2;
- m_mouseX = m_centerX;
- m_mouseY = m_centerY;
- resize(m_nAppX, m_nAppY);
- pixls = m_nAppX * m_nAppY;
- pixls2 = pixls - m_nAppX * 2;
- pix0 = new int[pixls];
- offImage = new MemoryImageSource(m_nAppX, m_nAppY, pix0, 0, m_nAppX);
- offImage.setAnimated(true);
- dbImg = createImage(offImage);
- for (int i = 0; i < pixls; i++)
- pix0[i] = 0xff000000;
- //sound1 = getAudioClip(getDocumentBase(), "firework.au");
- //sound2 = getAudioClip(getDocumentBase(), "syu.au");
- for (int j = 0; j < bits; j++)
- bit_f[j] = 0;
- isInitialized = true;
- start();
- }
- private boolean stop;
- public void run() {
- while (!isInitialized)
- try {
- Thread.sleep(200L);
- } catch (InterruptedException interruptedexception) {
- }
- do {
- for (int j = 0; j < pixls2; j++) {
- int k = pix0[j];
- int l = pix0[j + 1];
- int i1 = pix0[j + m_nAppX];
- int j1 = pix0[j + m_nAppX + 1];
- int i = (k & 0xff0000) >> 16;
- int k1 = ((((l & 0xff0000) >> 16) - i) * ru >> 8) + i;
- i = (k & 0xff00) >> 8;
- int l1 = ((((l & 0xff00) >> 8) - i) * ru >> 8) + i;
- i = k & 0xff;
- int i2 = (((l & 0xff) - i) * ru >> 8) + i;
- i = (i1 & 0xff0000) >> 16;
- int j2 = ((((j1 & 0xff0000) >> 16) - i) * ru >> 8) + i;
- i = (i1 & 0xff00) >> 8;
- int k2 = ((((j1 & 0xff00) >> 8) - i) * ru >> 8) + i;
- i = i1 & 0xff;
- int l2 = (((j1 & 0xff) - i) * ru >> 8) + i;
- int i3 = ((j2 - k1) * rv >> 8) + k1;
- int j3 = ((k2 - l1) * rv >> 8) + l1;
- int k3 = ((l2 - i2) * rv >> 8) + i2;
- pix0[j] = i3 << 16 | j3 << 8 | k3 | 0xff000000;
- }
- rend();
- offImage.newPixels(0, 0, m_nAppX, m_nAppY);
- try {
- Thread.sleep(m_sleepTime);
- } catch (InterruptedException interruptedexception1) {
- }
- } while (!stop);
- }
- public void update(Graphics g) {
- paint(g);
- }
- public void paint(Graphics g) {
- g.drawImage(dbImg, 0, 0, this);
- }
- public void start() {
- if (isError)
- return;
- isRunning = true;
- if (runner == null) {
- runner = new Thread(this);
- runner.start();
- }
- }
- @SuppressWarnings("deprecation")
- public void stop() {
- if (runner != null) {
- runner.stop();
- runner = null;
- }
- }
- public boolean mouseMove(Event event, int i, int j) {
- m_mouseX = i;
- m_mouseY = j;
- return true;
- }
- public boolean mouseDown(Event event, int i, int j) {
- m_mouseX = i;
- m_mouseY = j;
- int k = (int) (rand.nextDouble() * 256D);
- int l = (int) (rand.nextDouble() * 256D);
- int i1 = (int) (rand.nextDouble() * 256D);
- int j1 = k << 16 | l << 8 | i1 | 0xff000000;
- int k1 = 0;
- for (int l1 = 0; l1 < bits; l1++) {
- if (bit_f[l1] != 0)
- continue;
- bit_px[l1] = m_mouseX;
- bit_py[l1] = m_mouseY;
- double d = rand.nextDouble() * 6.2800000000000002D;
- double d1 = rand.nextDouble();
- bit_vx[l1] = Math.sin(d) * d1;
- bit_vy[l1] = Math.cos(d) * d1;
- bit_l[l1] = (int) (rand.nextDouble() * 100D) + 100;
- bit_p[l1] = (int) (rand.nextDouble() * 3D);
- bit_c[l1] = j1;
- bit_sx[l1] = m_mouseX;
- bit_sy[l1] = m_nAppY - 5;
- bit_f[l1] = 2;
- if (++k1 == bit_max)
- break;
- }
- if (bit_sound > 1)
- sound2.play();
- return true;
- }
- public boolean mouseExit(Event event, int i, int j) {
- m_mouseX = i;
- m_mouseY = j;
- return true;
- }
- // (JAVA世纪网,java2000.net)
- void rend() {
- boolean flag2 = false;
- for (int k = 0; k < bits; k++)
- switch (bit_f[k]) {
- default:
- break;
- case 1: // '\001'
- bit_vy[k] += rand.nextDouble() / 50D;
- bit_px[k] += bit_vx[k];
- bit_py[k] += bit_vy[k];
- bit_l[k]--;
- if (bit_l[k] == 0 || bit_px[k] < 0.0D || bit_py[k] < 0.0D || bit_px[k] > (double) m_nAppX
- || bit_py[k] > (double) (m_nAppY - 3)) {
- bit_c[k] = 0xff000000;
- bit_f[k] = 0;
- } else if (bit_p[k] == 0) {
- if ((int) (rand.nextDouble() * 2D) == 0)
- bit_set((int) bit_px[k], (int) bit_py[k], -1);
- } else {
- bit_set((int) bit_px[k], (int) bit_py[k], bit_c[k]);
- }
- break;
- case 2: // '\002'
- bit_sy[k] -= 5;
- if ((double) bit_sy[k] <= bit_py[k]) {
- bit_f[k] = 1;
- flag2 = true;
- }
- if ((int) (rand.nextDouble() * 20D) == 0) {
- int i = (int) (rand.nextDouble() * 2D);
- int j = (int) (rand.nextDouble() * 5D);
- bit_set(bit_sx[k] + i, bit_sy[k] + j, -1);
- }
- break;
- }
- if (flag2 && bit_sound > 0)
- sound1.play();
- }
- void bit_set(int i, int j, int k) {
- int l = i + j * m_nAppX;
- pix0[l] = k;
- }
- private int m_nAppX;
- private int m_nAppY;
- private int m_centerX;
- private int m_centerY;
- private int m_mouseX;
- private int m_mouseY;
- private int m_sleepTime;
- private boolean isError;
- boolean isRunning;
- boolean isInitialized;
- Thread runner;
- int pix0[];
- MemoryImageSource offImage;
- Image dbImg;
- int pixls;
- int pixls2;
- Random rand;
- int bits;
- double bit_px[];
- double bit_py[];
- double bit_vx[];
- double bit_vy[];
- int bit_sx[];
- int bit_sy[];
- int bit_l[];
- int bit_f[];
- int bit_p[];
- int bit_c[];
- int bit_max;
- int bit_sound;
- int ru;
- int rv;
- AudioClip sound1;
- AudioClip sound2;
- }
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