/* -----------------------------------------------
/* 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();

};