烟花例子效果-html代码-BFW代码库

代码语言：html
所属分类：粒子
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">

<style>
  body {
  margin: 0;
  overflow: hidden;
  background-color: #141414;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 100;
}
</style>

</head>
<body translate="no">
<script>
  window.canvasOptions = {
  	autoClear: true,
  	autoCompensate: false,
  	autoPushPop: true,
  	canvas: true,
  	centered: true,
  	desynchronized: false,
  	width: null,
  	height: null
  };
const {
	E, LN10, LN2, LOG10E, LOG2E, PI, SQRT1_2, SQRT2,
	abs, acos, acosh, asin, asinh, atan, atan2, atanh, cbrt, ceil, clz32,
	cosh, exp, expm1, floor, fround, hypot, imul, log, log10, log1p, log2, max,
	min, pow, /* random, */ round, sign, sinh, sqrt, tan, tanh, trunc
} = Math;


// Why not?
const ZERO       = 0.0;
const ONE        = 1.0;
const TWO        = 2.0;
const THREE      = 3.0;
const FOUR       = 4.0;
const FIVE       = 5.0;
const SIX        = 6.0;
const SEVEN      = 7.0;
const EIGHT      = 8.0;
const NINE       = 9.0;
const TEN        = 10.0;
const ELEVEN     = 11.0;
const TWELVE     = 12.0;
const SIXTEEN    = 16.0;
const THIRTY     = 30.0;
const THIRTY_TWO = 32.0;
const SIXTY      = 60.0;
const HUNDRED    = 100.0;
const THOUSAND   = 1000.0;

const HALF            = ONE / TWO;
const THIRD           = ONE / THREE;
const TWO_THIRDS      = THIRD * TWO;
const QUARTER         = ONE / FOUR;
const THREE_QUARTER   = QUARTER * THREE;
const FIFTH           = ONE / FIVE;
const SIXTH           = ONE / SIX;
const SEVENTH         = ONE / SEVEN;
const EIGHTH          = ONE / EIGHT;
const TWELFTH         = ONE / TWELVE;
const SIXTEENTH       = ONE / SIXTEEN;
const ONE_THIRTIETH   = ONE / THIRTY;
const THIRTY_SECONDTH = ONE / THIRTY_TWO;
const SIXTIETH        = ONE / SIXTY;

const TENTH              = 1e-1;
const HUNDREDTH          = 1e-2;
const THOUSANDTH         = 1e-3;
const TEN_THOUSANDTH     = 1e-4;
const HUNDRED_THOUSANDTH = 1e-5;
const MILLIONTH          = 1e-6;
const TEN_MILLIONTH      = 1e-7;
const HUNDRED_MILLIONTH  = 1e-8;
const BILLIONTH          = 1e-9;
const TEN_BILLIONTH      = 1e-10;
const HUNDRED_BILLIONTH  = 1e-11;

const HALF_PI             = PI * HALF;
const THIRD_PI            = PI * THIRD;
const THREE_QUARTER_PI    = PI * THREE_QUARTER;
const QUARTER_PI          = PI * QUARTER;
const FIFTH_PI            = PI * FIFTH;
const SIXTH_PI            = PI * SIXTH;
const SEVENTH_PI          = PI * SEVENTH;
const EIGHTH_PI           = PI * EIGHTH;
const TWELFTH_PI          = PI * TWELFTH;
const SIXTEENTH_PI        = PI * SIXTEENTH;
const THIRTY_SECONDTH_PI  = PI * THIRTY_SECONDTH;
const TAU                 = PI * TWO;
const TWO_TAU             = TAU * TWO;
const HALF_TAU            = PI;
const THIRD_TAU           = TAU * THIRD;
const QUARTER_TAU         = HALF_PI;
const FIFTH_TAU           = TAU * FIFTH;
const SIXTH_TAU           = THIRD_PI;
const EIGHTH_TAU          = QUARTER_PI;
const TWELFTH_TAU         = SIXTH_PI;
const SIXTEENTH_TAU       = EIGHTH_PI;
const THIRTY_SECONDTH_TAU = SIXTEENTH_PI;

const SQRT_3              = sqrt(THREE);
const SQRT_4              = sqrt(FOUR);
const SQRT_5              = sqrt(FIVE);

const PHI                 = (1 + sqrt(5)) * 0.5;
const GOLDEN_ANGLE        = 1 / (PHI * PHI);

const COLOR_BLACK         = hsl(0, 0, 0);
const COLOR_WHITE         = hsl(0, 0, 100);
const COLOR_RED           = hsl(0, 100, 50);
const COLOR_ORANGE        = hsl(30, 100, 50);
const COLOR_YELLOW        = hsl(60, 100, 50);
const COLOR_GREEN         = hsl(120, 100, 50);
const COLOR_CYAN          = hsl(180, 100, 50);
const COLOR_BLUE          = hsl(240, 100, 50);
const COLOR_PURPLE        = hsl(280, 100, 50);
const COLOR_MAGENTA       = hsl(300, 100, 50);

const TEXTALIGN_LEFT      = 'left';
const TEXTALIGN_CENTER    = 'center';
const TEXTALIGN_RIGHT     = 'right';
const TEXTBASELINE_TOP    = 'top';
const TEXTBASELINE_MIDDLE = 'middle';
const TEXTBASELINE_BOTTOM = 'bottom';

let _defaulCanvasOptions = {
		autoClear: false,
		autoCompensate: true,
		autoPushPop: false,
		canvas: true,
		centered: false,
		desynchronized: false,
		width: null,
		height: null
	};
let _canvasOptions = {};
let canvas = document.getElementById('canvas');
if(canvas === null) {
	canvas = document.createElement('canvas');
	canvas.id = 'canvas';
	document.body.appendChild(canvas);
}
let ctx = canvas.getContext('2d', {
	desynchronized: window.canvasOptions && window.canvasOptions.desynchronized !== undefined ?
		window.canvasOptions.desynchronized : _defaulCanvasOptions.desynchronized
	// preserveDrawingBuffer: true // WebGL
});
const _originalCtx = ctx;
let _anim, _lastCanvasTime, canvasFrameRate, frameCount, width, height, width_half, height_half, width_quarter, height_quarter;
let _canvasCurrentlyCentered = false;
let mouseUpdate = -Infinity, mouseIn = false, mouseDown = false, mouseMove = null, mousePos = null, mousePosPrev = null;

function updateMouse(e) { // Modified from p5.js
	if(e && !e.clientX) {
		e = e.touches ? e.touches[0] : (e.changedTouches ? e.changedTouches[0] : e);
	}
	mouseUpdate = e.timeStamp === undefined ? performance.now() : e.timeStamp;
	let rect = canvas.getBoundingClientRect();
	let sx   = canvas.scrollWidth / width;
	let sy   = canvas.scrollHeight / height;
	let x = (e.clientX - rect.left) / sx;
	let y = (e.clientY - rect.top) / sy;
	if(x < 0) x = 0;
	else if(x > width) x = width;
	if(y < 0) y = 0;
	else if(y > height) y = height;
	if(mousePos) {
		mousePosPrev.set(mousePos);
		mousePos.set(x, y);
	}
	// return { x, y, winX: e.clientX, winY: e.clientY, id: e.identifier };
}

// let mouseIn = false, mouseDown = false, mouseMove = null, mousePos = { x: 0, y: 0 };
// function updateMouse(e) {
// 	if(e && !e.clientX) {
// 		e = e.touches ? e.touches[0] : (e.changedTouches ? e.changedTouches[0] : e);
// 	}
// 	const { innerWidth: width, innerHeight: height } = window;
// 	uniforms.mouse.value.set(e.clientX / width, 1 - e.clientY / height);
// }

// [
// 	[ 'mouseenter', e => mouseIn = true ],
// 	[ 'mouseleave', e => (mouseIn = false, mouseDown = false) ],
// 	[ 'mousemove', e => (mouseIn = true, mouseMove = e.timeStamp) ],
// 	[ 'mousedown', e => (mouseIn = true, mouseDown = true) ],
// 	[ 'mouseup', e => mouseDown = false ],
// 	[ 'touchstart', e => mouseIn = true ],
// 	[ 'touchend', e => (mouseIn = false, mouseDown = false) ],
// 	[ 'touchcancel', e => (mouseIn = false, mouseDown = false) ],
// 	[ 'touchmove', e => (mouseIn = true, mouseMove = e.timeStamp) ]
// ].forEach(([ eventName, cb ]) => document.body.addEventListener(eventName, e => {
// 	updateMouse(e);
// 	cb(e);
// }));

canvas.addEventListener('mouseenter',  e => (updateMouse(e), mouseIn = true));
canvas.addEventListener('mouseleave',  e => (updateMouse(e), mouseIn = false, mouseDown = false));
canvas.addEventListener('mousemove',   e => (updateMouse(e), mouseIn = true, mouseMove = e.timeStamp));
canvas.addEventListener('mousedown',   e => (updateMouse(e), mouseIn = true, mouseDown = true));
canvas.addEventListener('mouseup',     e => (updateMouse(e), mouseDown = false));
canvas.addEventListener('touchstart',  e => (updateMouse(e), mouseIn = true));
canvas.addEventListener('touchend',    e => (updateMouse(e), mouseIn = false, mouseDown = false));
canvas.addEventListener('touchcancel', e => (updateMouse(e), mouseIn = false, mouseDown = false));
canvas.addEventListener('touchmove',   e => (updateMouse(e), mouseIn = true));
window.addEventListener('resize', _resizeCanvas);
window.addEventListener('load', () => {
	mousePos = createVector().........完整代码请登录后点击上方下载按钮下载查看