HTML5超炫酷粒子效果的进度条的实现示例
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2022-08-07 19:13:19
这篇文章主要介绍了HTML5超炫酷粒子效果的进度条的实现示例,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学... 19-08-23...
这是一款基于html5和javascript的进度条应用,这款进度条插件非常有特点,它在进度展示的时候呈现粒子的动画效果,也就是说,进度条在滑动的同时,会产生一些小粒子掉落下来,效果非常酷。另外还有一个特点是随着进度的变化,进度条的颜色也会变化。
javascript代码
/*========================================================*/ /* light loader /*========================================================*/ var lightloader = function(c, cw, ch){ var _this = this; this.c = c; this.ctx = c.getcontext('2d'); this.cw = cw; this.ch = ch; this.loaded = 0; this.loaderspeed = .6; this.loaderheight = 10; this.loaderwidth = 310; this.loader = { x: (this.cw/2) - (this.loaderwidth/2), y: (this.ch/2) - (this.loaderheight/2) }; this.particles = []; this.particlelift = 180; this.huestart = 0 this.hueend = 120; this.hue = 0; this.gravity = .15; this.particlerate = 4; /*========================================================*/ /* initialize /*========================================================*/ this.init = function(){ this.loop(); }; /*========================================================*/ /* utility functions /*========================================================*/ this.rand = function(rmi, rma){return ~~((math.random()*(rma-rmi+1))+rmi);}; this.hittest = function(x1, y1, w1, h1, x2, y2, w2, h2){return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);}; /*========================================================*/ /* update loader /*========================================================*/ this.updateloader = function(){ if(this.loaded < 100){ this.loaded += this.loaderspeed; } else { this.loaded = 0; } }; /*========================================================*/ /* render loader /*========================================================*/ this.renderloader = function(){ this.ctx.fillstyle = '#000'; this.ctx.fillrect(this.loader.x, this.loader.y, this.loaderwidth, this.loaderheight); this.hue = this.huestart + (this.loaded/100)*(this.hueend - this.huestart); var newwidth = (this.loaded/100)*this.loaderwidth; this.ctx.fillstyle = 'hsla('+this.hue+', 100%, 40%, 1)'; this.ctx.fillrect(this.loader.x, this.loader.y, newwidth, this.loaderheight); this.ctx.fillstyle = '#222'; this.ctx.fillrect(this.loader.x, this.loader.y, newwidth, this.loaderheight/2); }; /*========================================================*/ /* particles /*========================================================*/ this.particle = function(){ this.x = _this.loader.x + ((_this.loaded/100)*_this.loaderwidth) - _this.rand(0, 1); this.y = _this.ch/2 + _this.rand(0,_this.loaderheight)-_this.loaderheight/2; this.vx = (_this.rand(0,4)-2)/100; this.vy = (_this.rand(0,_this.particlelift)-_this.particlelift*2)/100; this.width = _this.rand(1,4)/2; this.height = _this.rand(1,4)/2; this.hue = _this.hue; }; this.particle.prototype.update = function(i){ this.vx += (_this.rand(0,6)-3)/100; this.vy += _this.gravity; this.x += this.vx; this.y += this.vy; if(this.y > _this.ch){ _this.particles.splice(i, 1); } }; this.particle.prototype.render = function(){ _this.ctx.fillstyle = 'hsla('+this.hue+', 100%, '+_this.rand(50,70)+'%, '+_this.rand(20,100)/100+')'; _this.ctx.fillrect(this.x, this.y, this.width, this.height); }; this.createparticles = function(){ var i = this.particlerate; while(i--){ this.particles.push(new this.particle()); }; }; this.updateparticles = function(){ var i = this.particles.length; while(i--){ var p = this.particles[i]; p.update(i); }; }; this.renderparticles = function(){ var i = this.particles.length; while(i--){ var p = this.particles[i]; p.render(); }; }; /*========================================================*/ /* clear canvas /*========================================================*/ this.clearcanvas = function(){ this.ctx.globalcompositeoperation = 'source-over'; this.ctx.clearrect(0,0,this.cw,this.ch); this.ctx.globalcompositeoperation = 'lighter'; }; /*========================================================*/ /* animation loop /*========================================================*/ this.loop = function(){ var loopit = function(){ requestanimationframe(loopit, _this.c); _this.clearcanvas(); _this.createparticles(); _this.updateloader(); _this.updateparticles(); _this.renderloader(); _this.renderparticles(); }; loopit(); }; }; /*========================================================*/ /* check canvas support /*========================================================*/ var iscanvassupported = function(){ var elem = document.createelement('canvas'); return !!(elem.getcontext && elem.getcontext('2d')); }; /*========================================================*/ /* setup requestanimationframe /*========================================================*/ var setupraf = function(){ var lasttime = 0; var vendors = ['ms', 'moz', 'webkit', 'o']; for(var x = 0; x < vendors.length && !window.requestanimationframe; ++x){ window.requestanimationframe = window[vendors[x]+'requestanimationframe']; window.cancelanimationframe = window[vendors[x]+'cancelanimationframe'] || window[vendors[x]+'cancelrequestanimationframe']; }; if(!window.requestanimationframe){ window.requestanimationframe = function(callback, element){ var currtime = new date().gettime(); var timetocall = math.max(0, 16 - (currtime - lasttime)); var id = window.settimeout(function() { callback(currtime + timetocall); }, timetocall); lasttime = currtime + timetocall; return id; }; }; if (!window.cancelanimationframe){ window.cancelanimationframe = function(id){ cleartimeout(id); }; }; }; /*========================================================*/ /* define canvas and initialize /*========================================================*/ if(iscanvassupported){ var c = document.createelement('canvas'); c.width = 400; c.height = 100; var cw = c.width; var ch = c.height; document.body.appendchild(c); var cl = new lightloader(c, cw, ch); setupraf(); cl.init(); }
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