Rotating Distance-limited Voronoi - d3v4 - canvas

.block

license: gpl-3.0

README.md

Revisitng the famous mbostock's block: Rotating Voronoi with the d3-distanceLimitedVoronoi plugin I made.

At each iteration, maximum distance from each datum/seed is updated. Compare to the SVG version.

index.html

<meta charset="utf-8">
<style>

body {
  background: #000;
}

path {
  fill: #fff;
  stroke: #000;
  stroke-width: 1.5px;
}

</style>
<body>
	<script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://raw.githack.com/Kcnarf/d3-distanceLimitedVoronoi/master/distance-limited-voronoi.js"></script>
  <script>

    var width = 960,
        height = 500;

    var start = Date.now(),
        points = [];
    
    var maxDistance = 400;
		
    circle(0, 0, 120, 96, -.001);
    circle(0, 0, 30, 10, .03);
    circle(0, 0, 60, 3, -.05);
    circle(0, 0, 15, 4, -.02);
    circle(0, 0, 0, 1, -.02);

    circle(240, -120, 80, 4, -.02);
    circle(240, -120, 0, 1, -.02);

    circle(280, +120, 40, 8, .02);
    circle(280, +120, 20, 8, -.02);
    circle(280, +120, 0, 1, .02);
    
    var canvas = d3.select("body").append("canvas")
        .attr("width", width)
        .attr("height", height);
    var context = canvas.node().getContext("2d");
    context.translate(width/2, height/2);
    
    var limitedVoronoi = d3.distanceLimitedVoronoi()
    limitedVoronoi.extent([[-width / 2, -height / 2],[+width / 2, +height / 2]]).limit(maxDistance).context(context);
      
    d3.timer(function(elapsed) {
      //update limit
      limitedVoronoi.limit(2+maxDistance*Math.pow(Math.cos((elapsed++)/5000), 4));
      
      //delete previous rendering
      context.fillStyle = 'black';
      context.fillRect(-width/2, -height/2, width, height);
      
      //renders new distance-limited voronoi
      context.strokeStyle = 'black';
      context.fillStyle = 'white';
      context.beginPath();
      limitedVoronoi(points);
      context.fill();
      context.stroke();
    });

    function circle(cx, cy, r, n, δθ) {
      d3.range(1e-6, 2 * Math.PI, 2 * Math.PI / n).map(function(θ, i) {
        var point = [cx + Math.cos(θ) * r, cy + Math.sin(θ) * r];
        d3.timer(function(elapsed) {
          var angle = θ + δθ * elapsed / 60;
          point[0] = cx + Math.cos(angle) * r;
          point[1] = cy + Math.sin(angle) * r;
        });
        points.push(point);
        return point;
      });
    }
  </script>
</body>

thumbnail.png