d3 and fancy user interface

We can use a resource called d3 to great very complex user interfaces in a Notebook.

In this example, a cluster of balls is created that moves around as the computer mouse chases the balls, as in the figure here.

This code was poached from here:
https://github.com/skariel/IPython_d3_js_demo/blob/master/d3_js_demo.ipynb

There are three cells in this example.

the first cell creates a file, which has some html code and javascript to control the balls
the second cell defines Python functions that edie the file, to adjust the number of balls, etc.
the third cell calls the Python funciton f1 that launches the html and javascript.

Here is the first cell.

%%writefile f1.template
<!DOCTYPE html>
<html>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
    <script type="text/javascript" src="https://mbostock.github.io/d3/talk/20111018/d3/d3.js"></script>
    <script type="text/javascript" src="https://mbostock.github.io/d3/talk/20111018/d3/d3.geom.js"></script>
    <script type="text/javascript" src="https://mbostock.github.io/d3/talk/20111018/d3/d3.layout.js"></script>
    <style type="text/css">

circle {
  stroke: #000;
  stroke-opacity: .5;
}

    </style>
  <body>
    <div id="body">
    <script type="text/javascript">

var w = {width},
    h = {height};

var nodes = d3.range({ball_count}).map(function() { return {radius: Math.random() * {rad_fac} + {rad_min}}; }),
    color = d3.scale.category10();

var force = d3.layout.force()
    .gravity(0.1)
    .charge(function(d, i) { return i ? 0 : -2000; })
    .nodes(nodes)
    .size([w, h]);

var root = nodes[0];
root.radius = 0;
root.fixed = true;

force.start();

var svg = d3.select("#body").append("svg:svg")
    .attr("width", w)
    .attr("height", h);

svg.selectAll("circle")
    .data(nodes.slice(1))
  .enter().append("svg:circle")
    .attr("r", function(d) { return d.radius - 2; })
    .style("fill", function(d, i) { return color(i % {color_count}); });

force.on("tick", function(e) {
  var q = d3.geom.quadtree(nodes),
      i = 0,
      n = nodes.length;

  while (++i < n) {
    q.visit(collide(nodes[i]));
  }

  svg.selectAll("circle")
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
});

svg.on("mousemove", function() {
  var p1 = d3.svg.mouse(this);
  root.px = p1[0];
  root.py = p1[1];
  force.resume();
});

function collide(node) {
  var r = node.radius + 16,
      nx1 = node.x - r,
      nx2 = node.x + r,
      ny1 = node.y - r,
      ny2 = node.y + r;
  return function(quad, x1, y1, x2, y2) {
    if (quad.point && (quad.point !== node)) {
      var x = node.x - quad.point.x,
          y = node.y - quad.point.y,
          l = Math.sqrt(x * x + y * y),
          r = node.radius + quad.point.radius;
      if (l < r) {
        l = (l - r) / l * .5;
        node.x -= x *= l;
        node.y -= y *= l;
        quad.point.x += x;
        quad.point.y += y;
      }
    }
    return x1 > nx2
        || x2 < nx1
        || y1 > ny2
        || y2 < ny1;
  };
}

    </script>
  </body>
</html>

Here is the second cell.

from IPython.display import IFrame
import re

def replace_all(txt,d):
    rep = dict((re.escape('{'+k+'}'), str(v)) for k, v in d.items())
    pattern = re.compile("|".join(rep.keys()))
    return pattern.sub(lambda m: rep[re.escape(m.group(0))], txt)    

count=0
def serve_html(s,w,h):
    import os
    global count
    count+=1
    fn= '__tmp'+str(os.getpid())+'_'+str(count)+'.html'
    with open(fn,'w') as f:
        f.write(s)
    return IFrame('files/'+fn,w,h)

def f1(w=500,h=400,ball_count=150,rad_min=2,rad_fac=11,color_count=3):
    d={
       'width'      :w,
       'height'     :h,
       'ball_count' :ball_count,
       'rad_min'    :rad_min,
       'rad_fac'    :rad_fac,
       'color_count':color_count
       }
    with open('f1.template','r') as f:
        s=f.read()
    s= replace_all(s,d)        
    return serve_html(s,w+30,h+30)

Here is the third and final cell.

f1(ball_count=50, color_count=17, rad_fac=10, rad_min=3, w=600)

d3 and games

d3 and fancy user interface

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