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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML
!

CSS 

              
                body{
  margin: 0;
}

svg{
  position: fixed;
  top: 0;
}
!

JS 

              
                var w = 1300,
  h = 1000,
  voronoi = new Voronoi(),
  bbox = {
    xl: 0,
    xr: w,
    yt: 0,
    yb: h
  },
  sites = [{
    id: 0,
    x: 50,
    y: 200
  }, {
    id: 1,
    x: 200,
    y: 250
  }, {
    id: 2,
    x: 300,
    y: 100
  }, {
    id: 3,
    x: 500,
    y: 200
  }, {
    id: 4,
    x: 500,
    y: 300
  }],
  diagram,
  v = new Snap(w, h),
  ui = new Snap(w, h),
  focus,
  colors = ['#3D9299', '#14BECC', '#00FF83', '#FF7985', '#CC1481'],
  currentColor = 0;

updateUI();
updateVoronoi();

function handle_addClick(e) {

  var _id = parseInt(this.attr('vId'));

  if (_id == sites.length - 1) {
    sites.push({
      id: sites.length,
      x: sites[sites.length - 1].x + 50,
      y: sites[sites.length - 1].y + 50
    });
  } else {

    //TODO:: children's children
    var parent = sites[_id];
    if (parent.collection) {
      parent.collection.push({
        id: _id + "_" + parent.collection.length,
        x: parent.collection[parent.collection.length - 1].x + 50,
        y: parent.collection[parent.collection.length - 1].y + 50
      });
    } else {
      parent.collection = [{
        id: _id + "_0",
        x: sites[_id].x + 30,
        y: sites[_id].y + 50
      }];
    }
  }

    updateUI();
    updateVoronoi();
}

function getById(_id) {
  var i,
    j;

  for (i = 0; i < sites.length; i += 1) {

    if (sites[i].id == _id) {
      return sites[i];
    } else if (sites[i].collection) {

      //TODO:: loop children's children
      for (j = 0; j < sites[i].collection.length; j += 1) {
        if (sites[i].collection[j].id == _id) {
          return sites[i].collection[j];
        }
      }

    }
  }

  return false;
}

function handle_dragStart() {
  this.data('origTransform', this.transform().local);
  removeFocus();
}

function handle_dragStop() {
    updatePaths();
    updateVoronoi();
  console.log('drag stop');
}

function handle_drag(dx, dy, px, py) {
  var x, y;
  this.attr({
    transform: this.data('origTransform') + (this.data('origTransform') ? "T" : "t") + [dx, dy]
  });

  if (this.data('origTransform')) {
    x = parseFloat(this.attr('cx')) + parseFloat(this.data('origTransform').replace('t', '').split(',')[0]) + dx,
      y = parseFloat(this.attr('cy')) + parseFloat(this.data('origTransform').replace('t', '').split(',')[1]) + dy;
  } else {
    x = parseFloat(this.attr('cx')) + dx;
    y = parseFloat(this.attr('cy')) + dy;
  }

  var movedCircle = getById(this.attr('vId'));

  if (movedCircle) {
    movedCircle.x = x;
    movedCircle.y = y;
  }

    updatePaths();
    //updateVoronoi();
}

function addFocus(e, t) {
  var x = e.target.cx.baseVal.value,
    y = e.target.cy.baseVal.value;

  focus = ui.g();
  focusCircle = ui.circle(0, 0, 50);
  focusCircle.attr({
    fill: 'transparent',
    stroke: '#222',
    'stroke-width': '2',
    pointerEvents: 'none'
  });
  focus.append(focusCircle);

  focusBtn = ui.g();
  focusBtn.transform('translate(0, 50)');
  focusBtn.click(handle_addClick, t);
  focus.append(focusBtn);

  focusBtnCircle = ui.circle(0, 0, 15);
  focusBtnCircle.attr('fill', '#666');
  focusBtn.append(focusBtnCircle);

  focusIcon = ui.path('M-3.8-1.3H-1v-2.8h2.3v2.8H4v2.1H1.3v2.8H-1V0.8h-2.8V-1.3z');
  focusIcon.attr('fill', 'white');
  focusBtn.append(focusIcon);

  var m = e.target.transform.baseVal[0].matrix,
    mat = new Snap.matrix(m);
  mat.translate(x, y);

  focus.transform(mat);
}

function removeFocus() {
  if (focus) {
    focus.remove();
  }
}

function handle_click(e) {
  addFocus(e, this);
}

function handle_clickOff(e) {
  removeFocus(e);
}

function flatten(_s) {
  var arr = [],
      n = 0,
      j = 0;
    
  for (n; n < _s.length; n += 1) {
    arr.push(_s[n]);

    if (_s[n].collection) {
      for (j = 0; j < _s[n].collection.length; j += 1) {
        arr.push(_s[n].collection[j]);
      }
    }
  }
  
  return arr;
}

function getMask() {
  var i,
    l,
    _l,
    maskGroup,
    arr = [],
    strokeOpts = {
      'fill': 'transparent',
      'stroke-width': '100',
      'stroke-linejoin': 'round',
      'stroke-linecap': 'round',
      'stroke': 'purple'
    };

  maskGroup = v.g();

  for (i = 0; i < sites.length; i += 1) {
    arr.push(sites[i].x);
    arr.push(sites[i].y);

    if (sites[i].collection) {
      var seg = [sites[i].x, sites[i].y];

      for (j = 0; j < sites[i].collection.length; j += 1) {
        seg.push(sites[i].collection[j].x);
        seg.push(sites[i].collection[j].y);
      }

      _l = v.polyline(seg);
      _l.attr(strokeOpts);
      maskGroup.append(_l);
    }
  }

  l = v.polyline(arr);
  l.attr(strokeOpts);
  maskGroup.append(l);

  return maskGroup;
}

function updateVoronoi() {
  var i,
    line,
    l,
    mask,
    maskContent,
    vGroup,
    flattenSites;

  flattenSites = flatten(sites);

  if (flattenSites.length == 0) {
    return;
  }
  
  diagram = voronoi.compute(flattenSites, bbox),
    
  v.clear();
  vGroup = v.g();
  
  for (i = 0; i < diagram.cells.length; i += 1) {
    var cell = diagram.cells[i];
    var arr = [];

    for (j = 0; j < cell.halfedges.length; j += 1) {
      start = cell.halfedges[j].getStartpoint();
      end = cell.halfedges[j].getEndpoint();

      arr.push(start.x);
      arr.push(start.y);
      arr.push(end.x);
      arr.push(end.y);
    }

    var l = v.polygon(arr);
    l.attr({
      'fill': colors[currentColor]
    });
    vGroup.append(l);

    currentColor = currentColor + 1 > colors.length - 1 ? 0 : currentColor + 1;
  }

  //mask
  maskContent = getMask();
  mask = v.mask();
  mask.attr({
    'mask-type': 'alpha'
  })
  mask.append(maskContent);
  vGroup.attr({
    'mask': mask
  });

  //depth
  var clone = vGroup.clone();
  clone.transform('translate(0, 10)');
  var satFilter = v.filter(Snap.filter.brightness(0.5));
  clone.attr({
    'filter': satFilter
  });
  clone.insertBefore(vGroup);

    //depth
  var clone2 = vGroup.clone();
  clone2.transform('translate(0, 20)');
  var satFilter2 = v.filter(Snap.filter.brightness(0.0));
  clone2.attr({
    'opacity': 0.1,
    'filter': satFilter2
  });
  clone2.insertBefore(clone);
}

function updatePaths() {
  var i;

  ui.selectAll('line').remove();

  for (i = 0; i < sites.length; i += 1) {
    if (i > 0) {
      var line = ui.line(sites[i - 1].x, sites[i - 1].y, sites[i].x, sites[i].y);
      line.attr({
        'stroke': '#efefef',
        'stroke-width': '7',
        'stroke-linejoin': 'round',
        'stroke-linecap': 'round'
      });
      childrenPaths(sites[i]);
    }
  }
}

function childrenPaths(_s) {
  var i;
  
  if (_s.collection) {
    for (i = 0; i < _s.collection.length; i += 1) {
      if (i == 0) {
        var line = ui.line(_s.x, _s.y, _s.collection[i].x, _s.collection[i].y);
      } else {
        var line = ui.line(_s.collection[i - 1].x, _s.collection[i - 1].y, _s.collection[i].x, _s.collection[i].y);
      }
      line.attr({
        'stroke': '#efefef',
        'stroke-width': '7',
        'stroke-linejoin': 'round',
        'stroke-linecap': 'round'
      });
      childrenPaths(_s.collection[i]);
    }
  }
}

function updateChildren(_s, id) {
  var i;

  if (_s.collection) {

    for (i = 0; i < _s.collection.length; i += 1) {
      var s = _s.collection[i];

      var site = ui.circle(s.x, s.y, 20);
      site.attr({
        'vId': id + '_' + i,
        'cursor': 'pointer',
        'fill': '#333'
      });
      site.drag(handle_drag, handle_dragStart, handle_dragStop);
      site.click(handle_click);

      updateChildren(s, id + '_' + i);
    }
  }
}

function updateUI() {
  var i;

  ui.clear();

  var rect = ui.rect(0, 0, w, h);
  rect.attr('fill', 'transparent');
  rect.click(handle_clickOff);

  for (i = 0; i < sites.length; i += 1) {
    var s = sites[i];

    var site = ui.circle(s.x, s.y, 20);
    site.attr({
      'vId': i,
      'cursor': 'pointer',
      'fill': '#333'
    });
    site.drag(handle_drag, handle_dragStart, handle_dragStop);
    site.click(handle_click);

    updateChildren(s, i);
  }

  updatePaths();
}
!
999px

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