代码来自头条号'前端小智', 侵权删
次要应用的就是particles.js插件,倡议之间看视频
https://m.toutiaoimg.cn/group...
html文件:
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>粒子特效</title> <style> *{ margin: 0; padding: 0; } section{ width: 100%; height: 100vh; position: absolute; background: #111; } </style></head><body> <section id="particles-js"> </section> <script src="./particles.js"></script> <script src="./app.js"></script></body></html>particles.js文件:
/* -----------------------------------------------/* Author : Vincent Garreau - vincentgarreau.com/* MIT license: http://opensource.org/licenses/MIT/* Demo / Generator : vincentgarreau.com/particles.js/* GitHub : github.com/VincentGarreau/particles.js/* How to use? : Check the GitHub README/* v2.0.0/* ----------------------------------------------- */var pJS = function(tag_id, params){ var canvas_el = document.querySelector('#'+tag_id+' > .particles-js-canvas-el'); /* particles.js variables with default values */ this.pJS = { canvas: { el: canvas_el, w: canvas_el.offsetWidth, h: canvas_el.offsetHeight }, particles: { number: { value: 400, density: { enable: true, value_area: 800 } }, color: { value: '#fff' }, shape: { type: 'circle', stroke: { width: 0, color: '#ff0000' }, polygon: { nb_sides: 5 }, image: { src: '', width: 100, height: 100 } }, opacity: { value: 1, random: false, anim: { enable: false, speed: 2, opacity_min: 0, sync: false } }, size: { value: 20, random: false, anim: { enable: false, speed: 20, size_min: 0, sync: false } }, line_linked: { enable: true, distance: 100, color: '#fff', opacity: 1, width: 1 }, move: { enable: true, speed: 2, direction: 'none', random: false, straight: false, out_mode: 'out', bounce: false, attract: { enable: false, rotateX: 3000, rotateY: 3000 } }, array: [] }, interactivity: { detect_on: 'canvas', events: { onhover: { enable: true, mode: 'grab' }, onclick: { enable: true, mode: 'push' }, resize: true }, modes: { grab:{ distance: 100, line_linked:{ opacity: 1 } }, bubble:{ distance: 200, size: 80, duration: 0.4 }, repulse:{ distance: 200, duration: 0.4 }, push:{ particles_nb: 4 }, remove:{ particles_nb: 2 } }, mouse:{} }, retina_detect: false, fn: { interact: {}, modes: {}, vendors:{} }, tmp: {} }; var pJS = this.pJS; /* params settings */ if(params){ Object.deepExtend(pJS, params); } pJS.tmp.obj = { size_value: pJS.particles.size.value, size_anim_speed: pJS.particles.size.anim.speed, move_speed: pJS.particles.move.speed, line_linked_distance: pJS.particles.line_linked.distance, line_linked_width: pJS.particles.line_linked.width, mode_grab_distance: pJS.interactivity.modes.grab.distance, mode_bubble_distance: pJS.interactivity.modes.bubble.distance, mode_bubble_size: pJS.interactivity.modes.bubble.size, mode_repulse_distance: pJS.interactivity.modes.repulse.distance }; pJS.fn.retinaInit = function(){ if(pJS.retina_detect && window.devicePixelRatio > 1){ pJS.canvas.pxratio = window.devicePixelRatio; pJS.tmp.retina = true; } else{ pJS.canvas.pxratio = 1; pJS.tmp.retina = false; } pJS.canvas.w = pJS.canvas.el.offsetWidth * pJS.canvas.pxratio; pJS.canvas.h = pJS.canvas.el.offsetHeight * pJS.canvas.pxratio; pJS.particles.size.value = pJS.tmp.obj.size_value * pJS.canvas.pxratio; pJS.particles.size.anim.speed = pJS.tmp.obj.size_anim_speed * pJS.canvas.pxratio; pJS.particles.move.speed = pJS.tmp.obj.move_speed * pJS.canvas.pxratio; pJS.particles.line_linked.distance = pJS.tmp.obj.line_linked_distance * pJS.canvas.pxratio; pJS.interactivity.modes.grab.distance = pJS.tmp.obj.mode_grab_distance * pJS.canvas.pxratio; pJS.interactivity.modes.bubble.distance = pJS.tmp.obj.mode_bubble_distance * pJS.canvas.pxratio; pJS.particles.line_linked.width = pJS.tmp.obj.line_linked_width * pJS.canvas.pxratio; pJS.interactivity.modes.bubble.size = pJS.tmp.obj.mode_bubble_size * pJS.canvas.pxratio; pJS.interactivity.modes.repulse.distance = pJS.tmp.obj.mode_repulse_distance * pJS.canvas.pxratio; }; /* ---------- pJS functions - canvas ------------ */ pJS.fn.canvasInit = function(){ pJS.canvas.ctx = pJS.canvas.el.getContext('2d'); }; pJS.fn.canvasSize = function(){ pJS.canvas.el.width = pJS.canvas.w; pJS.canvas.el.height = pJS.canvas.h; if(pJS && pJS.interactivity.events.resize){ window.addEventListener('resize', function(){ pJS.canvas.w = pJS.canvas.el.offsetWidth; pJS.canvas.h = pJS.canvas.el.offsetHeight; /* resize canvas */ if(pJS.tmp.retina){ pJS.canvas.w *= pJS.canvas.pxratio; pJS.canvas.h *= pJS.canvas.pxratio; } pJS.canvas.el.width = pJS.canvas.w; pJS.canvas.el.height = pJS.canvas.h; /* repaint canvas on anim disabled */ if(!pJS.particles.move.enable){ pJS.fn.particlesEmpty(); pJS.fn.particlesCreate(); pJS.fn.particlesDraw(); pJS.fn.vendors.densityAutoParticles(); } /* density particles enabled */ pJS.fn.vendors.densityAutoParticles(); }); } }; pJS.fn.canvasPaint = function(){ pJS.canvas.ctx.fillRect(0, 0, pJS.canvas.w, pJS.canvas.h); }; pJS.fn.canvasClear = function(){ pJS.canvas.ctx.clearRect(0, 0, pJS.canvas.w, pJS.canvas.h); }; /* --------- pJS functions - particles ----------- */ pJS.fn.particle = function(color, opacity, position){ /* size */ this.radius = (pJS.particles.size.random ? Math.random() : 1) * pJS.particles.size.value; if(pJS.particles.size.anim.enable){ this.size_status = false; this.vs = pJS.particles.size.anim.speed / 100; if(!pJS.particles.size.anim.sync){ this.vs = this.vs * Math.random(); } } /* position */ this.x = position ? position.x : Math.random() * pJS.canvas.w; this.y = position ? position.y : Math.random() * pJS.canvas.h; /* check position - into the canvas */ if(this.x > pJS.canvas.w - this.radius*2) this.x = this.x - this.radius; else if(this.x < this.radius*2) this.x = this.x + this.radius; if(this.y > pJS.canvas.h - this.radius*2) this.y = this.y - this.radius; else if(this.y < this.radius*2) this.y = this.y + this.radius; /* check position - avoid overlap */ if(pJS.particles.move.bounce){ pJS.fn.vendors.checkOverlap(this, position); } /* color */ this.color = {}; if(typeof(color.value) == 'object'){ if(color.value instanceof Array){ var color_selected = color.value[Math.floor(Math.random() * pJS.particles.color.value.length)]; this.color.rgb = hexToRgb(color_selected); }else{ if(color.value.r != undefined && color.value.g != undefined && color.value.b != undefined){ this.color.rgb = { r: color.value.r, g: color.value.g, b: color.value.b } } if(color.value.h != undefined && color.value.s != undefined && color.value.l != undefined){ this.color.hsl = { h: color.value.h, s: color.value.s, l: color.value.l } } } } else if(color.value == 'random'){ this.color.rgb = { r: (Math.floor(Math.random() * (255 - 0 + 1)) + 0), g: (Math.floor(Math.random() * (255 - 0 + 1)) + 0), b: (Math.floor(Math.random() * (255 - 0 + 1)) + 0) } } else if(typeof(color.value) == 'string'){ this.color = color; this.color.rgb = hexToRgb(this.color.value); } /* opacity */ this.opacity = (pJS.particles.opacity.random ? Math.random() : 1) * pJS.particles.opacity.value; if(pJS.particles.opacity.anim.enable){ this.opacity_status = false; this.vo = pJS.particles.opacity.anim.speed / 100; if(!pJS.particles.opacity.anim.sync){ this.vo = this.vo * Math.random(); } } /* animation - velocity for speed */ var velbase = {} switch(pJS.particles.move.direction){ case 'top': velbase = { x:0, y:-1 }; break; case 'top-right': velbase = { x:0.5, y:-0.5 }; break; case 'right': velbase = { x:1, y:-0 }; break; case 'bottom-right': velbase = { x:0.5, y:0.5 }; break; case 'bottom': velbase = { x:0, y:1 }; break; case 'bottom-left': velbase = { x:-0.5, y:1 }; break; case 'left': velbase = { x:-1, y:0 }; break; case 'top-left': velbase = { x:-0.5, y:-0.5 }; break; default: velbase = { x:0, y:0 }; break; } if(pJS.particles.move.straight){ this.vx = velbase.x; this.vy = velbase.y; if(pJS.particles.move.random){ this.vx = this.vx * (Math.random()); this.vy = this.vy * (Math.random()); } }else{ this.vx = velbase.x + Math.random()-0.5; this.vy = velbase.y + Math.random()-0.5; } // var theta = 2.0 * Math.PI * Math.random(); // this.vx = Math.cos(theta); // this.vy = Math.sin(theta); this.vx_i = this.vx; this.vy_i = this.vy; /* if shape is image */ var shape_type = pJS.particles.shape.type; if(typeof(shape_type) == 'object'){ if(shape_type instanceof Array){ var shape_selected = shape_type[Math.floor(Math.random() * shape_type.length)]; this.shape = shape_selected; } }else{ this.shape = shape_type; } if(this.shape == 'image'){ var sh = pJS.particles.shape; this.img = { src: sh.image.src, ratio: sh.image.width / sh.image.height } if(!this.img.ratio) this.img.ratio = 1; if(pJS.tmp.img_type == 'svg' && pJS.tmp.source_svg != undefined){ pJS.fn.vendors.createSvgImg(this); if(pJS.tmp.pushing){ this.img.loaded = false; } } } }; pJS.fn.particle.prototype.draw = function() { var p = this; if(p.radius_bubble != undefined){ var radius = p.radius_bubble; }else{ var radius = p.radius; } if(p.opacity_bubble != undefined){ var opacity = p.opacity_bubble; }else{ var opacity = p.opacity; } if(p.color.rgb){ var color_value = 'rgba('+p.color.rgb.r+','+p.color.rgb.g+','+p.color.rgb.b+','+opacity+')'; }else{ var color_value = 'hsla('+p.color.hsl.h+','+p.color.hsl.s+'%,'+p.color.hsl.l+'%,'+opacity+')'; } pJS.canvas.ctx.fillStyle = color_value; pJS.canvas.ctx.beginPath(); switch(p.shape){ case 'circle': pJS.canvas.ctx.arc(p.x, p.y, radius, 0, Math.PI * 2, false); break; case 'edge': pJS.canvas.ctx.rect(p.x-radius, p.y-radius, radius*2, radius*2); break; case 'triangle': pJS.fn.vendors.drawShape(pJS.canvas.ctx, p.x-radius, p.y+radius / 1.66, radius*2, 3, 2); break; case 'polygon': pJS.fn.vendors.drawShape( pJS.canvas.ctx, p.x - radius / (pJS.particles.shape.polygon.nb_sides/3.5), // startX p.y - radius / (2.66/3.5), // startY radius*2.66 / (pJS.particles.shape.polygon.nb_sides/3), // sideLength pJS.particles.shape.polygon.nb_sides, // sideCountNumerator 1 // sideCountDenominator ); break; case 'star': pJS.fn.vendors.drawShape( pJS.canvas.ctx, p.x - radius*2 / (pJS.particles.shape.polygon.nb_sides/4), // startX p.y - radius / (2*2.66/3.5), // startY radius*2*2.66 / (pJS.particles.shape.polygon.nb_sides/3), // sideLength pJS.particles.shape.polygon.nb_sides, // sideCountNumerator 2 // sideCountDenominator ); break; case 'image': function draw(){ pJS.canvas.ctx.drawImage( img_obj, p.x-radius, p.y-radius, radius*2, radius*2 / p.img.ratio ); } if(pJS.tmp.img_type == 'svg'){ var img_obj = p.img.obj; }else{ var img_obj = pJS.tmp.img_obj; } if(img_obj){ draw(); } break; } pJS.canvas.ctx.closePath(); if(pJS.particles.shape.stroke.width > 0){ pJS.canvas.ctx.strokeStyle = pJS.particles.shape.stroke.color; pJS.canvas.ctx.lineWidth = pJS.particles.shape.stroke.width; pJS.canvas.ctx.stroke(); } pJS.canvas.ctx.fill(); }; pJS.fn.particlesCreate = function(){ for(var i = 0; i < pJS.particles.number.value; i++) { pJS.particles.array.push(new pJS.fn.particle(pJS.particles.color, pJS.particles.opacity.value)); } }; pJS.fn.particlesUpdate = function(){ for(var i = 0; i < pJS.particles.array.length; i++){ /* the particle */ var p = pJS.particles.array[i]; // var d = ( dx = pJS.interactivity.mouse.click_pos_x - p.x ) * dx + ( dy = pJS.interactivity.mouse.click_pos_y - p.y ) * dy; // var f = -BANG_SIZE / d; // if ( d < BANG_SIZE ) { // var t = Math.atan2( dy, dx ); // p.vx = f * Math.cos(t); // p.vy = f * Math.sin(t); // } /* move the particle */ if(pJS.particles.move.enable){ var ms = pJS.particles.move.speed/2; p.x += p.vx * ms; p.y += p.vy * ms; } /* change opacity status */ if(pJS.particles.opacity.anim.enable) { if(p.opacity_status == true) { if(p.opacity >= pJS.particles.opacity.value) p.opacity_status = false; p.opacity += p.vo; }else { if(p.opacity <= pJS.particles.opacity.anim.opacity_min) p.opacity_status = true; p.opacity -= p.vo; } if(p.opacity < 0) p.opacity = 0; } /* change size */ if(pJS.particles.size.anim.enable){ if(p.size_status == true){ if(p.radius >= pJS.particles.size.value) p.size_status = false; p.radius += p.vs; }else{ if(p.radius <= pJS.particles.size.anim.size_min) p.size_status = true; p.radius -= p.vs; } if(p.radius < 0) p.radius = 0; } /* change particle position if it is out of canvas */ if(pJS.particles.move.out_mode == 'bounce'){ var new_pos = { x_left: p.radius, x_right: pJS.canvas.w, y_top: p.radius, y_bottom: pJS.canvas.h } }else{ var new_pos = { x_left: -p.radius, x_right: pJS.canvas.w + p.radius, y_top: -p.radius, y_bottom: pJS.canvas.h + p.radius } } if(p.x - p.radius > pJS.canvas.w){ p.x = new_pos.x_left; p.y = Math.random() * pJS.canvas.h; } else if(p.x + p.radius < 0){ p.x = new_pos.x_right; p.y = Math.random() * pJS.canvas.h; } if(p.y - p.radius > pJS.canvas.h){ p.y = new_pos.y_top; p.x = Math.random() * pJS.canvas.w; } else if(p.y + p.radius < 0){ p.y = new_pos.y_bottom; p.x = Math.random() * pJS.canvas.w; } /* out of canvas modes */ switch(pJS.particles.move.out_mode){ case 'bounce': if (p.x + p.radius > pJS.canvas.w) p.vx = -p.vx; else if (p.x - p.radius < 0) p.vx = -p.vx; if (p.y + p.radius > pJS.canvas.h) p.vy = -p.vy; else if (p.y - p.radius < 0) p.vy = -p.vy; break; } /* events */ if(isInArray('grab', pJS.interactivity.events.onhover.mode)){ pJS.fn.modes.grabParticle(p); } if(isInArray('bubble', pJS.interactivity.events.onhover.mode) || isInArray('bubble', pJS.interactivity.events.onclick.mode)){ pJS.fn.modes.bubbleParticle(p); } if(isInArray('repulse', pJS.interactivity.events.onhover.mode) || isInArray('repulse', pJS.interactivity.events.onclick.mode)){ pJS.fn.modes.repulseParticle(p); } /* interaction auto between particles */ if(pJS.particles.line_linked.enable || pJS.particles.move.attract.enable){ for(var j = i + 1; j < pJS.particles.array.length; j++){ var p2 = pJS.particles.array[j]; /* link particles */ if(pJS.particles.line_linked.enable){ pJS.fn.interact.linkParticles(p,p2); } /* attract particles */ if(pJS.particles.move.attract.enable){ pJS.fn.interact.attractParticles(p,p2); } /* bounce particles */ if(pJS.particles.move.bounce){ pJS.fn.interact.bounceParticles(p,p2); } } } } }; pJS.fn.particlesDraw = function(){ /* clear canvas */ pJS.canvas.ctx.clearRect(0, 0, pJS.canvas.w, pJS.canvas.h); /* update each particles param */ pJS.fn.particlesUpdate(); /* draw each particle */ for(var i = 0; i < pJS.particles.array.length; i++){ var p = pJS.particles.array[i]; p.draw(); } }; pJS.fn.particlesEmpty = function(){ pJS.particles.array = []; }; pJS.fn.particlesRefresh = function(){ /* init all */ cancelRequestAnimFrame(pJS.fn.checkAnimFrame); cancelRequestAnimFrame(pJS.fn.drawAnimFrame); pJS.tmp.source_svg = undefined; pJS.tmp.img_obj = undefined; pJS.tmp.count_svg = 0; pJS.fn.particlesEmpty(); pJS.fn.canvasClear(); /* restart */ pJS.fn.vendors.start(); }; /* ---------- pJS functions - particles interaction ------------ */ pJS.fn.interact.linkParticles = function(p1, p2){ var dx = p1.x - p2.x, dy = p1.y - p2.y, dist = Math.sqrt(dx*dx + dy*dy); /* draw a line between p1 and p2 if the distance between them is under the config distance */ if(dist <= pJS.particles.line_linked.distance){ var opacity_line = pJS.particles.line_linked.opacity - (dist / (1/pJS.particles.line_linked.opacity)) / pJS.particles.line_linked.distance; if(opacity_line > 0){ /* style */ var color_line = pJS.particles.line_linked.color_rgb_line; pJS.canvas.ctx.strokeStyle = 'rgba('+color_line.r+','+color_line.g+','+color_line.b+','+opacity_line+')'; pJS.canvas.ctx.lineWidth = pJS.particles.line_linked.width; //pJS.canvas.ctx.lineCap = 'round'; /* performance issue */ /* path */ pJS.canvas.ctx.beginPath(); pJS.canvas.ctx.moveTo(p1.x, p1.y); pJS.canvas.ctx.lineTo(p2.x, p2.y); pJS.canvas.ctx.stroke(); pJS.canvas.ctx.closePath(); } } }; pJS.fn.interact.attractParticles = function(p1, p2){ /* condensed particles */ var dx = p1.x - p2.x, dy = p1.y - p2.y, dist = Math.sqrt(dx*dx + dy*dy); if(dist <= pJS.particles.line_linked.distance){ var ax = dx/(pJS.particles.move.attract.rotateX*1000), ay = dy/(pJS.particles.move.attract.rotateY*1000); p1.vx -= ax; p1.vy -= ay; p2.vx += ax; p2.vy += ay; } } pJS.fn.interact.bounceParticles = function(p1, p2){ var dx = p1.x - p2.x, dy = p1.y - p2.y, dist = Math.sqrt(dx*dx + dy*dy), dist_p = p1.radius+p2.radius; if(dist <= dist_p){ p1.vx = -p1.vx; p1.vy = -p1.vy; p2.vx = -p2.vx; p2.vy = -p2.vy; } } /* ---------- pJS functions - modes events ------------ */ pJS.fn.modes.pushParticles = function(nb, pos){ pJS.tmp.pushing = true; for(var i = 0; i < nb; i++){ pJS.particles.array.push( new pJS.fn.particle( pJS.particles.color, pJS.particles.opacity.value, { 'x': pos ? pos.pos_x : Math.random() * pJS.canvas.w, 'y': pos ? pos.pos_y : Math.random() * pJS.canvas.h } ) ) if(i == nb-1){ if(!pJS.particles.move.enable){ pJS.fn.particlesDraw(); } pJS.tmp.pushing = false; } } }; pJS.fn.modes.removeParticles = function(nb){ pJS.particles.array.splice(0, nb); if(!pJS.particles.move.enable){ pJS.fn.particlesDraw(); } }; pJS.fn.modes.bubbleParticle = function(p){ /* on hover event */ if(pJS.interactivity.events.onhover.enable && isInArray('bubble', pJS.interactivity.events.onhover.mode)){ var dx_mouse = p.x - pJS.interactivity.mouse.pos_x, dy_mouse = p.y - pJS.interactivity.mouse.pos_y, dist_mouse = Math.sqrt(dx_mouse*dx_mouse + dy_mouse*dy_mouse), ratio = 1 - dist_mouse / pJS.interactivity.modes.bubble.distance; function init(){ p.opacity_bubble = p.opacity; p.radius_bubble = p.radius; } /* mousemove - check ratio */ if(dist_mouse <= pJS.interactivity.modes.bubble.distance){ if(ratio >= 0 && pJS.interactivity.status == 'mousemove'){ /* size */ if(pJS.interactivity.modes.bubble.size != pJS.particles.size.value){ if(pJS.interactivity.modes.bubble.size > pJS.particles.size.value){ var size = p.radius + (pJS.interactivity.modes.bubble.size*ratio); if(size >= 0){ p.radius_bubble = size; } }else{ var dif = p.radius - pJS.interactivity.modes.bubble.size, size = p.radius - (dif*ratio); if(size > 0){ p.radius_bubble = size; }else{ p.radius_bubble = 0; } } } /* opacity */ if(pJS.interactivity.modes.bubble.opacity != pJS.particles.opacity.value){ if(pJS.interactivity.modes.bubble.opacity > pJS.particles.opacity.value){ var opacity = pJS.interactivity.modes.bubble.opacity*ratio; if(opacity > p.opacity && opacity <= pJS.interactivity.modes.bubble.opacity){ p.opacity_bubble = opacity; } }else{ var opacity = p.opacity - (pJS.particles.opacity.value-pJS.interactivity.modes.bubble.opacity)*ratio; if(opacity < p.opacity && opacity >= pJS.interactivity.modes.bubble.opacity){ p.opacity_bubble = opacity; } } } } }else{ init(); } /* mouseleave */ if(pJS.interactivity.status == 'mouseleave'){ init(); } } /* on click event */ else if(pJS.interactivity.events.onclick.enable && isInArray('bubble', pJS.interactivity.events.onclick.mode)){ if(pJS.tmp.bubble_clicking){ var dx_mouse = p.x - pJS.interactivity.mouse.click_pos_x, dy_mouse = p.y - pJS.interactivity.mouse.click_pos_y, dist_mouse = Math.sqrt(dx_mouse*dx_mouse + dy_mouse*dy_mouse), time_spent = (new Date().getTime() - pJS.interactivity.mouse.click_time)/1000; if(time_spent > pJS.interactivity.modes.bubble.duration){ pJS.tmp.bubble_duration_end = true; } if(time_spent > pJS.interactivity.modes.bubble.duration*2){ pJS.tmp.bubble_clicking = false; pJS.tmp.bubble_duration_end = false; } } function process(bubble_param, particles_param, p_obj_bubble, p_obj, id){ if(bubble_param != particles_param){ if(!pJS.tmp.bubble_duration_end){ if(dist_mouse <= pJS.interactivity.modes.bubble.distance){ if(p_obj_bubble != undefined) var obj = p_obj_bubble; else var obj = p_obj; if(obj != bubble_param){ var value = p_obj - (time_spent * (p_obj - bubble_param) / pJS.interactivity.modes.bubble.duration); if(id == 'size') p.radius_bubble = value; if(id == 'opacity') p.opacity_bubble = value; } }else{ if(id == 'size') p.radius_bubble = undefined; if(id == 'opacity') p.opacity_bubble = undefined; } }else{ if(p_obj_bubble != undefined){ var value_tmp = p_obj - (time_spent * (p_obj - bubble_param) / pJS.interactivity.modes.bubble.duration), dif = bubble_param - value_tmp; value = bubble_param + dif; if(id == 'size') p.radius_bubble = value; if(id == 'opacity') p.opacity_bubble = value; } } } } if(pJS.tmp.bubble_clicking){ /* size */ process(pJS.interactivity.modes.bubble.size, pJS.particles.size.value, p.radius_bubble, p.radius, 'size'); /* opacity */ process(pJS.interactivity.modes.bubble.opacity, pJS.particles.opacity.value, p.opacity_bubble, p.opacity, 'opacity'); } } }; pJS.fn.modes.repulseParticle = function(p){ if(pJS.interactivity.events.onhover.enable && isInArray('repulse', pJS.interactivity.events.onhover.mode) && pJS.interactivity.status == 'mousemove') { var dx_mouse = p.x - pJS.interactivity.mouse.pos_x, dy_mouse = p.y - pJS.interactivity.mouse.pos_y, dist_mouse = Math.sqrt(dx_mouse*dx_mouse + dy_mouse*dy_mouse); var normVec = {x: dx_mouse/dist_mouse, y: dy_mouse/dist_mouse}, repulseRadius = pJS.interactivity.modes.repulse.distance, velocity = 100, repulseFactor = clamp((1/repulseRadius)*(-1*Math.pow(dist_mouse/repulseRadius,2)+1)*repulseRadius*velocity, 0, 50); var pos = { x: p.x + normVec.x * repulseFactor, y: p.y + normVec.y * repulseFactor } if(pJS.particles.move.out_mode == 'bounce'){ if(pos.x - p.radius > 0 && pos.x + p.radius < pJS.canvas.w) p.x = pos.x; if(pos.y - p.radius > 0 && pos.y + p.radius < pJS.canvas.h) p.y = pos.y; }else{ p.x = pos.x; p.y = pos.y; } } else if(pJS.interactivity.events.onclick.enable && isInArray('repulse', pJS.interactivity.events.onclick.mode)) { if(!pJS.tmp.repulse_finish){ pJS.tmp.repulse_count++; if(pJS.tmp.repulse_count == pJS.particles.array.length){ pJS.tmp.repulse_finish = true; } } if(pJS.tmp.repulse_clicking){ var repulseRadius = Math.pow(pJS.interactivity.modes.repulse.distance/6, 3); var dx = pJS.interactivity.mouse.click_pos_x - p.x, dy = pJS.interactivity.mouse.click_pos_y - p.y, d = dx*dx + dy*dy; var force = -repulseRadius / d * 1; function process(){ var f = Math.atan2(dy,dx); p.vx = force * Math.cos(f); p.vy = force * Math.sin(f); if(pJS.particles.move.out_mode == 'bounce'){ var pos = { x: p.x + p.vx, y: p.y + p.vy } if (pos.x + p.radius > pJS.canvas.w) p.vx = -p.vx; else if (pos.x - p.radius < 0) p.vx = -p.vx; if (pos.y + p.radius > pJS.canvas.h) p.vy = -p.vy; else if (pos.y - p.radius < 0) p.vy = -p.vy; } } // default if(d <= repulseRadius){ process(); } // bang - slow motion mode // if(!pJS.tmp.repulse_finish){ // if(d <= repulseRadius){ // process(); // } // }else{ // process(); // } }else{ if(pJS.tmp.repulse_clicking == false){ p.vx = p.vx_i; p.vy = p.vy_i; } } } } pJS.fn.modes.grabParticle = function(p){ if(pJS.interactivity.events.onhover.enable && pJS.interactivity.status == 'mousemove'){ var dx_mouse = p.x - pJS.interactivity.mouse.pos_x, dy_mouse = p.y - pJS.interactivity.mouse.pos_y, dist_mouse = Math.sqrt(dx_mouse*dx_mouse + dy_mouse*dy_mouse); /* draw a line between the cursor and the particle if the distance between them is under the config distance */ if(dist_mouse <= pJS.interactivity.modes.grab.distance){ var opacity_line = pJS.interactivity.modes.grab.line_linked.opacity - (dist_mouse / (1/pJS.interactivity.modes.grab.line_linked.opacity)) / pJS.interactivity.modes.grab.distance; if(opacity_line > 0){ /* style */ var color_line = pJS.particles.line_linked.color_rgb_line; pJS.canvas.ctx.strokeStyle = 'rgba('+color_line.r+','+color_line.g+','+color_line.b+','+opacity_line+')'; pJS.canvas.ctx.lineWidth = pJS.particles.line_linked.width; //pJS.canvas.ctx.lineCap = 'round'; /* performance issue */ /* path */ pJS.canvas.ctx.beginPath(); pJS.canvas.ctx.moveTo(p.x, p.y); pJS.canvas.ctx.lineTo(pJS.interactivity.mouse.pos_x, pJS.interactivity.mouse.pos_y); pJS.canvas.ctx.stroke(); pJS.canvas.ctx.closePath(); } } } }; /* ---------- pJS functions - vendors ------------ */ pJS.fn.vendors.eventsListeners = function(){ /* events target element */ if(pJS.interactivity.detect_on == 'window'){ pJS.interactivity.el = window; }else{ pJS.interactivity.el = pJS.canvas.el; } /* detect mouse pos - on hover / click event */ if(pJS.interactivity.events.onhover.enable || pJS.interactivity.events.onclick.enable){ /* el on mousemove */ pJS.interactivity.el.addEventListener('mousemove', function(e){ if(pJS.interactivity.el == window){ var pos_x = e.clientX, pos_y = e.clientY; } else{ var pos_x = e.offsetX || e.clientX, pos_y = e.offsetY || e.clientY; } pJS.interactivity.mouse.pos_x = pos_x; pJS.interactivity.mouse.pos_y = pos_y; if(pJS.tmp.retina){ pJS.interactivity.mouse.pos_x *= pJS.canvas.pxratio; pJS.interactivity.mouse.pos_y *= pJS.canvas.pxratio; } pJS.interactivity.status = 'mousemove'; }); /* el on onmouseleave */ pJS.interactivity.el.addEventListener('mouseleave', function(e){ pJS.interactivity.mouse.pos_x = null; pJS.interactivity.mouse.pos_y = null; pJS.interactivity.status = 'mouseleave'; }); } /* on click event */ if(pJS.interactivity.events.onclick.enable){ pJS.interactivity.el.addEventListener('click', function(){ pJS.interactivity.mouse.click_pos_x = pJS.interactivity.mouse.pos_x; pJS.interactivity.mouse.click_pos_y = pJS.interactivity.mouse.pos_y; pJS.interactivity.mouse.click_time = new Date().getTime(); if(pJS.interactivity.events.onclick.enable){ switch(pJS.interactivity.events.onclick.mode){ case 'push': if(pJS.particles.move.enable){ pJS.fn.modes.pushParticles(pJS.interactivity.modes.push.particles_nb, pJS.interactivity.mouse); }else{ if(pJS.interactivity.modes.push.particles_nb == 1){ pJS.fn.modes.pushParticles(pJS.interactivity.modes.push.particles_nb, pJS.interactivity.mouse); } else if(pJS.interactivity.modes.push.particles_nb > 1){ pJS.fn.modes.pushParticles(pJS.interactivity.modes.push.particles_nb); } } break; case 'remove': pJS.fn.modes.removeParticles(pJS.interactivity.modes.remove.particles_nb); break; case 'bubble': pJS.tmp.bubble_clicking = true; break; case 'repulse': pJS.tmp.repulse_clicking = true; pJS.tmp.repulse_count = 0; pJS.tmp.repulse_finish = false; setTimeout(function(){ pJS.tmp.repulse_clicking = false; }, pJS.interactivity.modes.repulse.duration*1000) break; } } }); } }; pJS.fn.vendors.densityAutoParticles = function(){ if(pJS.particles.number.density.enable){ /* calc area */ var area = pJS.canvas.el.width * pJS.canvas.el.height / 1000; if(pJS.tmp.retina){ area = area/(pJS.canvas.pxratio*2); } /* calc number of particles based on density area */ var nb_particles = area * pJS.particles.number.value / pJS.particles.number.density.value_area; /* add or remove X particles */ var missing_particles = pJS.particles.array.length - nb_particles; if(missing_particles < 0) pJS.fn.modes.pushParticles(Math.abs(missing_particles)); else pJS.fn.modes.removeParticles(missing_particles); } }; pJS.fn.vendors.checkOverlap = function(p1, position){ for(var i = 0; i < pJS.particles.array.length; i++){ var p2 = pJS.particles.array[i]; var dx = p1.x - p2.x, dy = p1.y - p2.y, dist = Math.sqrt(dx*dx + dy*dy); if(dist <= p1.radius + p2.radius){ p1.x = position ? position.x : Math.random() * pJS.canvas.w; p1.y = position ? position.y : Math.random() * pJS.canvas.h; pJS.fn.vendors.checkOverlap(p1); } } }; pJS.fn.vendors.createSvgImg = function(p){ /* set color to svg element */ var svgXml = pJS.tmp.source_svg, rgbHex = /#([0-9A-F]{3,6})/gi, coloredSvgXml = svgXml.replace(rgbHex, function (m, r, g, b) { if(p.color.rgb){ var color_value = 'rgba('+p.color.rgb.r+','+p.color.rgb.g+','+p.color.rgb.b+','+p.opacity+')'; }else{ var color_value = 'hsla('+p.color.hsl.h+','+p.color.hsl.s+'%,'+p.color.hsl.l+'%,'+p.opacity+')'; } return color_value; }); /* prepare to create img with colored svg */ var svg = new Blob([coloredSvgXml], {type: 'image/svg+xml;charset=utf-8'}), DOMURL = window.URL || window.webkitURL || window, url = DOMURL.createObjectURL(svg); /* create particle img obj */ var img = new Image(); img.addEventListener('load', function(){ p.img.obj = img; p.img.loaded = true; DOMURL.revokeObjectURL(url); pJS.tmp.count_svg++; }); img.src = url; }; pJS.fn.vendors.destroypJS = function(){ cancelAnimationFrame(pJS.fn.drawAnimFrame); canvas_el.remove(); pJSDom = null; }; pJS.fn.vendors.drawShape = function(c, startX, startY, sideLength, sideCountNumerator, sideCountDenominator){ // By Programming Thomas - https://programmingthomas.wordpress.com/2013/04/03/n-sided-shapes/ var sideCount = sideCountNumerator * sideCountDenominator; var decimalSides = sideCountNumerator / sideCountDenominator; var interiorAngleDegrees = (180 * (decimalSides - 2)) / decimalSides; var interiorAngle = Math.PI - Math.PI * interiorAngleDegrees / 180; // convert to radians c.save(); c.beginPath(); c.translate(startX, startY); c.moveTo(0,0); for (var i = 0; i < sideCount; i++) { c.lineTo(sideLength,0); c.translate(sideLength,0); c.rotate(interiorAngle); } //c.stroke(); c.fill(); c.restore(); }; pJS.fn.vendors.exportImg = function(){ window.open(pJS.canvas.el.toDataURL('image/png'), '_blank'); }; pJS.fn.vendors.loadImg = function(type){ pJS.tmp.img_error = undefined; if(pJS.particles.shape.image.src != ''){ if(type == 'svg'){ var xhr = new XMLHttpRequest(); xhr.open('GET', pJS.particles.shape.image.src); xhr.onreadystatechange = function (data) { if(xhr.readyState == 4){ if(xhr.status == 200){ pJS.tmp.source_svg = data.currentTarget.response; pJS.fn.vendors.checkBeforeDraw(); }else{ console.log('Error pJS - Image not found'); pJS.tmp.img_error = true; } } } xhr.send(); }else{ var img = new Image(); img.addEventListener('load', function(){ pJS.tmp.img_obj = img; pJS.fn.vendors.checkBeforeDraw(); }); img.src = pJS.particles.shape.image.src; } }else{ console.log('Error pJS - No image.src'); pJS.tmp.img_error = true; } }; pJS.fn.vendors.draw = function(){ if(pJS.particles.shape.type == 'image'){ if(pJS.tmp.img_type == 'svg'){ if(pJS.tmp.count_svg >= pJS.particles.number.value){ pJS.fn.particlesDraw(); if(!pJS.particles.move.enable) cancelRequestAnimFrame(pJS.fn.drawAnimFrame); else pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw); }else{ //console.log('still loading...'); if(!pJS.tmp.img_error) pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw); } }else{ if(pJS.tmp.img_obj != undefined){ pJS.fn.particlesDraw(); if(!pJS.particles.move.enable) cancelRequestAnimFrame(pJS.fn.drawAnimFrame); else pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw); }else{ if(!pJS.tmp.img_error) pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw); } } }else{ pJS.fn.particlesDraw(); if(!pJS.particles.move.enable) cancelRequestAnimFrame(pJS.fn.drawAnimFrame); else pJS.fn.drawAnimFrame = requestAnimFrame(pJS.fn.vendors.draw); } }; pJS.fn.vendors.checkBeforeDraw = function(){ // if shape is image if(pJS.particles.shape.type == 'image'){ if(pJS.tmp.img_type == 'svg' && pJS.tmp.source_svg == undefined){ pJS.tmp.checkAnimFrame = requestAnimFrame(check); }else{ //console.log('images loaded! cancel check'); cancelRequestAnimFrame(pJS.tmp.checkAnimFrame); if(!pJS.tmp.img_error){ pJS.fn.vendors.init(); pJS.fn.vendors.draw(); } } }else{ pJS.fn.vendors.init(); pJS.fn.vendors.draw(); } }; pJS.fn.vendors.init = function(){ /* init canvas + particles */ pJS.fn.retinaInit(); pJS.fn.canvasInit(); pJS.fn.canvasSize(); pJS.fn.canvasPaint(); pJS.fn.particlesCreate(); pJS.fn.vendors.densityAutoParticles(); /* particles.line_linked - convert hex colors to rgb */ pJS.particles.line_linked.color_rgb_line = hexToRgb(pJS.particles.line_linked.color); }; pJS.fn.vendors.start = function(){ if(isInArray('image', pJS.particles.shape.type)){ pJS.tmp.img_type = pJS.particles.shape.image.src.substr(pJS.particles.shape.image.src.length - 3); pJS.fn.vendors.loadImg(pJS.tmp.img_type); }else{ pJS.fn.vendors.checkBeforeDraw(); } }; /* ---------- pJS - start ------------ */ pJS.fn.vendors.eventsListeners(); pJS.fn.vendors.start(); };/* ---------- global functions - vendors ------------ */Object.deepExtend = function(destination, source) { for (var property in source) { if (source[property] && source[property].constructor && source[property].constructor === Object) { destination[property] = destination[property] || {}; arguments.callee(destination[property], source[property]); } else { destination[property] = source[property]; } } return destination;};window.requestAnimFrame = (function(){ return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback){ window.setTimeout(callback, 1000 / 60); };})();window.cancelRequestAnimFrame = ( function() { return window.cancelAnimationFrame || window.webkitCancelRequestAnimationFrame || window.mozCancelRequestAnimationFrame || window.oCancelRequestAnimationFrame || window.msCancelRequestAnimationFrame || clearTimeout} )();function hexToRgb(hex){ // By Tim Down - http://stackoverflow.com/a/5624139/3493650 // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF") var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i; hex = hex.replace(shorthandRegex, function(m, r, g, b) { return r + r + g + g + b + b; }); var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex); return result ? { r: parseInt(result[1], 16), g: parseInt(result[2], 16), b: parseInt(result[3], 16) } : null;};function clamp(number, min, max) { return Math.min(Math.max(number, min), max);};function isInArray(value, array) { return array.indexOf(value) > -1;}/* ---------- particles.js functions - start ------------ */window.pJSDom = [];window.particlesJS = function(tag_id, params){ //console.log(params); /* no string id? so it's object params, and set the id with default id */ if(typeof(tag_id) != 'string'){ params = tag_id; tag_id = 'particles-js'; } /* no id? set the id to default id */ if(!tag_id){ tag_id = 'particles-js'; } /* pJS elements */ var pJS_tag = document.getElementById(tag_id), pJS_canvas_class = 'particles-js-canvas-el', exist_canvas = pJS_tag.getElementsByClassName(pJS_canvas_class); /* remove canvas if exists into the pJS target tag */ if(exist_canvas.length){ while(exist_canvas.length > 0){ pJS_tag.removeChild(exist_canvas[0]); } } /* create canvas element */ var canvas_el = document.createElement('canvas'); canvas_el.className = pJS_canvas_class; /* set size canvas */ canvas_el.style.width = "100%"; canvas_el.style.height = "100%"; /* append canvas */ var canvas = document.getElementById(tag_id).appendChild(canvas_el); /* launch particle.js */ if(canvas != null){ pJSDom.push(new pJS(tag_id, params)); }};window.particlesJS.load = function(tag_id, path_config_json, callback){ /* load json config */ var xhr = new XMLHttpRequest(); xhr.open('GET', path_config_json); xhr.onreadystatechange = function (data) { if(xhr.readyState == 4){ if(xhr.status == 200){ var params = JSON.parse(data.currentTarget.response); window.particlesJS(tag_id, params); if(callback) callback(); }else{ console.log('Error pJS - XMLHttpRequest status: '+xhr.status); console.log('Error pJS - File config not found'); } } }; xhr.send();};app.js文件:
/* -----------------------------------------------/* How to use? : Check the GitHub README/* ----------------------------------------------- *//* To load a config file (particles.json) you need to host this demo (MAMP/WAMP/local)... *//*particlesJS.load('particles-js', 'particles.json', function() { console.log('particles.js loaded - callback');});*//* Otherwise just put the config content (json): */particlesJS('particles-js', { "particles": { "number": { "value": 80, "density": { "enable": true, "value_area": 800 } }, "color": { "value": "#ffffff" }, "shape": { "type": "image", "stroke": { "width": 0, "color": "#000000" }, "polygon": { "nb_sides": 5 }, "image": { "src": "https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=2286420601,2705975510&fm=26&gp=0.jpg", "width": 100, "height": 100 } }, "opacity": { "value": 0.5, "random": false, "anim": { "enable": false, "speed": 1, "opacity_min": 0.1, "sync": false } }, "size": { "value": 70, "random": true, "anim": { "enable": false, "speed": 40, "size_min": 0.1, "sync": false } }, "line_linked": { "enable": true, "distance": 150, "color": "#ffffff", "opacity": 0.4, "width": 1 }, "move": { "enable": true, "speed": 6, "direction": "none", "random": false, "straight": false, "out_mode": "out", "attract": { "enable": false, "rotateX": 600, "rotateY": 1200 } } }, "interactivity": { "detect_on": "canvas", "events": { "onhover": { "enable": true, "mode": "repulse" }, "onclick": { "enable": true, "mode": "push" }, "resize": true }, "modes": { "grab": { "distance": 400, "line_linked": { "opacity": 1 } }, "bubble": { "distance": 400, "size": 40, "duration": 2, "opacity": 8, "speed": 3 }, "repulse": { "distance": 200 }, "push": { "particles_nb": 4 }, "remove": { "particles_nb": 2 } } }, "retina_detect": true, "config_demo": { "hide_card": false, "background_color": "#b61924", "background_image": "", "background_position": "50% 50%", "background_repeat": "no-repeat", "background_size": "cover" } });