cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

Quick-add: + add another resource

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Quick-add: + add another resource

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              svg#demo(viewBox='0 0 1600 600',preserveAspectRatio='xMidYMid slice')
  defs
    linearGradient#grad1(x1=0,y1=0,x2=1,y2=0,color-interpolation='sRGB')
      stop#stop1a(offset='0%',stop-color='#12a3b4')
      stop#stop1b(offset='100%',stop-color='#ff509e')
    linearGradient#grad2(x1=0,y1=0,x2=1,y2=0,color-interpolation='sRGB')
      stop#stop2a(offset='0%',stop-color='#e3bc13')
      stop#stop2b(offset='100%',stop-color='#00a78f')
  rect#rect1(x=0,y=0,width=1600,height=600,stroke='none',fill='url(#grad1)')
  rect#rect2(x=0,y=0,width=1600,height=600,stroke='none',fill='url(#grad2)')
            
          
!
            
              html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}
body {
  background: #e0e6eb;
}

svg {
  width: 100%;
  height: 100%;
  g {
    mix-blend-mode: lighten;
  }
  polygon {
    stroke: none;
    fill: white;
  }
}
            
          
!
            
              //////////////////////////////
// Demo Functions
//////////////////////////////

function init(showStats) {
  // stats
  if (showStats) {
    var stats = new Stats();
    stats.domElement.style.position = 'absolute';
    stats.domElement.style.left = '0';
    stats.domElement.style.top = '0';
    document.body.appendChild(stats.domElement);
    requestAnimationFrame(function updateStats(){
      stats.update();
      requestAnimationFrame(updateStats);
    });
  }

  // init
  var svg = document.getElementById('demo');
  tesselation.setup(svg);
  gradients.setup();

  var lastTransitionAt, transitionDelay = 5500, transitionDuration = 3000;

  function playNextTransition() {
    tesselation.next(transitionDuration);
    gradients.next(transitionDuration);
  };

  function tick(time) {
    if (!lastTransitionAt || time - lastTransitionAt > transitionDelay) {
      lastTransitionAt = time;
      playNextTransition();
    }
    window.requestAnimationFrame(tick);
  }
  window.requestAnimationFrame(tick);
}

//////////////////////////////
// Delaunay Triangulation
//////////////////////////////

var calcDelaunayTriangulation = (function() {
  var EPSILON = 1.0 / 1048576.0;
  function getSuperT(vertices) {
    var xMin = Number.POSITIVE_INFINITY, yMin = Number.POSITIVE_INFINITY,
        xMax = Number.NEGATIVE_INFINITY, yMax = Number.NEGATIVE_INFINITY,
        i, xDiff, yDiff, maxDiff, xCenter, yCenter;
    for(i = vertices.length; i--; ) {
      if(vertices[i][0] < xMin) xMin = vertices[i][0];
      if(vertices[i][0] > xMax) xMax = vertices[i][0];
      if(vertices[i][1] < yMin) yMin = vertices[i][1];
      if(vertices[i][1] > yMax) yMax = vertices[i][1];
    }
    xDiff = xMax - xMin;
    yDiff = yMax - yMin;
    maxDiff = Math.max(xDiff, yDiff);
    xCenter = xMin + xDiff * 0.5;
    yCenter = yMin + yDiff * 0.5;
    return [
      [xCenter - 20 * maxDiff, yCenter - maxDiff],
      [xCenter, yCenter + 20 * maxDiff],
      [xCenter + 20 * maxDiff, yCenter - maxDiff]
    ];
  }
  function circumcircle(vertices, i, j, k) {
    var xI = vertices[i][0], yI = vertices[i][1],
        xJ = vertices[j][0], yJ = vertices[j][1],
        xK = vertices[k][0], yK = vertices[k][1],
        yDiffIJ = Math.abs(yI - yJ), yDiffJK = Math.abs(yJ - yK),
        xCenter, yCenter, m1, m2, xMidIJ, xMidJK, yMidIJ, yMidJK, xDiff, yDiff;
    // bail condition
    if(yDiffIJ < EPSILON && yDiffJK < EPSILON)
      throw new Error("Can't get circumcircle since all 3 points are y-aligned");
    // calc circumcircle center x/y, radius
    m1  = -((xJ - xI) / (yJ - yI));
    m2  = -((xK - xJ) / (yK - yJ));
    xMidIJ = (xI + xJ) / 2.0;
    xMidJK = (xJ + xK) / 2.0;
    yMidIJ = (yI + yJ) / 2.0;
    yMidJK = (yJ + yK) / 2.0;
    xCenter = (yDiffIJ < EPSILON) ? xMidIJ :
      (yDiffJK < EPSILON) ? xMidJK :
      (m1 * xMidIJ - m2 * xMidJK + yMidJK - yMidIJ) / (m1 - m2);
    yCenter  = (yDiffIJ > yDiffJK) ?
      m1 * (xCenter - xMidIJ) + yMidIJ :
      m2 * (xCenter - xMidJK) + yMidJK;
    xDiff = xJ - xCenter;
    yDiff = yJ - yCenter;
    // return
    return {i: i, j: j, k: k, x: xCenter, y: yCenter, r: xDiff * xDiff + yDiff * yDiff};
  }
  function dedupeEdges(edges) {
    var i, j, a, b, m, n;
    for(j = edges.length; j; ) {
      b = edges[--j]; a = edges[--j];
      for(i = j; i; ) {
        n = edges[--i]; m = edges[--i];
        if((a === m && b === n) || (a === n && b === m)) {
          edges.splice(j, 2); edges.splice(i, 2);
          break;
        }
      }
    }
  }
  return function(vertices) {
    var n = vertices.length,
        i, j, indices, st, candidates, locked, edges, dx, dy, a, b, c;
    // bail if too few / too many verts
    if(n < 3 || n > 2000)
      return [];
    // copy verts and sort indices by x-position
    vertices = vertices.slice(0);
    indices = new Array(n);
    for(i = n; i--; )
      indices[i] = i;
    indices.sort(function(i, j) {
      return vertices[j][0] - vertices[i][0];
    });
    // supertriangle
    st = getSuperT(vertices);
    vertices.push(st[0], st[1], st[2]);
    // init candidates/locked tris list
    candidates = [circumcircle(vertices, n + 0, n + 1, n + 2)];
    locked = [];
    edges = [];
    // scan left to right
    for(i = indices.length; i--; edges.length = 0) {
      c = indices[i];
      // check candidates tris against point
      for(j = candidates.length; j--; ) {
        // lock tri if point to right of circumcirc
        dx = vertices[c][0] - candidates[j].x;
        if(dx > 0.0 && dx * dx > candidates[j].r) {
          locked.push(candidates[j]);
          candidates.splice(j, 1);
          continue;
        }
        // point outside circumcirc = leave candidates
        dy = vertices[c][1] - candidates[j].y;
        if(dx * dx + dy * dy - candidates[j].r > EPSILON)
          continue;
        // point inside circumcirc = break apart, save edges
        edges.push(
          candidates[j].i, candidates[j].j,
          candidates[j].j, candidates[j].k,
          candidates[j].k, candidates[j].i
        );
        candidates.splice(j, 1);
      }
      // new candidates from broken edges
      dedupeEdges(edges);
      for(j = edges.length; j; ) {
        b = edges[--j];
        a = edges[--j];
        candidates.push(circumcircle(vertices, a, b, c));
      }
    }
    // close candidates tris, remove tris touching supertri verts
    for(i = candidates.length; i--; )
      locked.push(candidates[i]);
    candidates.length = 0;
    for(i = locked.length; i--; )
      if(locked[i].i < n && locked[i].j < n && locked[i].k < n)
        candidates.push(locked[i].i, locked[i].j, locked[i].k);
    // done
    return candidates;
  };
})();

var tesselation = (function() {
  var svg, svgW, svgH, prevGroup;

  function createRandomTesselation() {
    var wW = window.innerWidth;
    var wH = window.innerHeight;

    var gridSpacing = 250, scatterAmount = 0.75;
    var gridSize, i, x, y;

    if (wW / wH > svgW / svgH) { // window wider than svg = use width for gridSize
      gridSize = gridSpacing * svgW / wW;
    } else { // window taller than svg = use height for gridSize
      gridSize = gridSpacing * svgH / wH;
    }

    var vertices = [];
    var xOffset = (svgW % gridSize) / 2, yOffset = (svgH % gridSize) / 2;
    for (x = Math.floor(svgW/gridSize) + 1; x >= -1; x--) {
      for (y = Math.floor(svgH/gridSize) + 1; y >= -1; y--) {
        vertices.push(
          [
            xOffset + gridSize * (x + scatterAmount * (Math.random() - 0.5)),
            yOffset + gridSize * (y + scatterAmount * (Math.random() - 0.5))
          ]
        );
      }
    }

    var triangles = calcDelaunayTriangulation(vertices);

    var group = document.createElementNS('http://www.w3.org/2000/svg','g');
    var polygon;
    for(i = triangles.length; i; ) {
      polygon = document.createElementNS('http://www.w3.org/2000/svg','polygon');
      polygon.setAttribute('points',
        vertices[triangles[--i]][0] + ',' + vertices[triangles[i]][1] + ' ' +
        vertices[triangles[--i]][0] + ',' + vertices[triangles[i]][1] + ' ' +
        vertices[triangles[--i]][0] + ',' + vertices[triangles[i]][1]
      );
      group.appendChild(polygon);
    }

    return group;
  }

  return {
    setup: function(svgElement) {
      svg = svgElement;
      var vb = svg.getAttribute('viewBox').split(/\D/g);
      svgW = vb[2];
      svgH = vb[3];
    },
    next: function(t) {
      var toRemove, i, n;
      t /= 1000;

      if (prevGroup && prevGroup.children && prevGroup.children.length) {
        toRemove = prevGroup;
        n = toRemove.children.length;
        for (i = n; i--; ) {
          TweenMax.to(toRemove.children[i], t*0.4, {opacity: 0, delay: t*(0.3*i/n)});
        }
        TweenMax.delayedCall(t * (0.7 + 0.05), function(group) { svg.removeChild(group); }, [toRemove], this);
      }
      var g = createRandomTesselation();
      n = g.children.length;
      for (i = n; i--; ) {
        TweenMax.fromTo(g.children[i], t*0.4, {opacity: 0}, {opacity: 0.3 + 0.25 * Math.random(), delay: t*(0.3*i/n + 0.3), ease: Back.easeOut});
      }
      svg.appendChild(g);
      prevGroup = g;
    }
  }
})();

//////////////////////////////
// Gradients
//////////////////////////////

var gradients = (function() {
  var grad1, grad2, showingGrad1;

  // using colors from IBM Design Colors this time
  var colors = [ // 14 colors - use 3-5 span
    '#3c6df0', // ultramarine50
    '#12a3b4', // aqua40
    '#00a78f', // teal40
    '#00aa5e', // green40
    '#81b532', // lime30
    '#e3bc13', // yellow20
    '#ffb000', // gold20
    '#fe8500', // orange30
    '#fe6100', // peach40
    '#e62325', // red50
    '#dc267f', // magenta50
    '#c22dd5', // purple50
    '#9753e1', // violet50
    '#5a3ec8'  // indigo60
  ];

  function assignRandomColors(gradObj) {
    var rA = Math.floor(colors.length * Math.random());
    var rB = Math.floor(Math.random() * 3) + 3; // [3 - 5]
    rB = (rA + (rB * (Math.random() < 0.5 ? -1 : 1)) + colors.length) % colors.length;
    gradObj.stopA.setAttribute('stop-color', colors[rA]);
    gradObj.stopB.setAttribute('stop-color', colors[rB]);
  }

  return {
    setup: function() {
      showingGrad1 = false;
      grad1 = {
        stopA: document.getElementById('stop1a'),
        stopB: document.getElementById('stop1b'),
        rect:  document.getElementById('rect1')
      };
      grad2 = {
        stopA: document.getElementById('stop2a'),
        stopB: document.getElementById('stop2b'),
        rect:  document.getElementById('rect2')
      };
      grad1.rect.style.opacity = 0;
      grad2.rect.style.opacity = 0;
    },
    next: function(t) {
      t /= 1000;

      var show, hide;
      if (showingGrad1) {
        hide = grad1;
        show = grad2;
      } else {
        hide = grad2;
        show = grad1;
      }
      showingGrad1 = !showingGrad1;

      TweenMax.to(hide.rect, 0.55*t, {opacity: 0, delay: 0.2*t, ease: Sine.easeOut});
      assignRandomColors(show);
      TweenMax.to(show.rect, 0.65*t, {opacity: 1, ease: Sine.easeIn});
    }
  };
})();

//////////////////////////////
// Start
//////////////////////////////

init();

            
          
!
999px
Loading ..................

Console