• Live example
• Example code

bower install d3-parliament

/* set up the parliament */
var parliament = d3.parliament();
parliament.width(500).height(500).innerRadiusCoef(0.4);
parliament.enter.fromCenter(true).smallToBig(true);
parliament.exit.toCenter(false).bigToSmall(true);

/* register event listeners */
parliament.on("click", function(d) { alert("You clicked on a seat of " + d.party.name); });
parliament.on("mouseover", function(d) { console.log("mouse on " + d.party.name); });
parliament.on("mouseout", function(d) { console.log("mouse out of " + d.party.name); });

/* add the parliament to the page */
d3.json("data.json", function(d) {
    d3.select("svg").datum(d).call(parliament);
});

You can set up the parameters of the parliament passing the values through the function named as the parameter (see the example):

• width Number = The max. width of the parliament (which will always be half a circle)
• height Number = The max. height of the parliament (which will always be half a circle)
• innerRadiusCoef Number = The coefficient applied to get the free space in the middle (min=0: no space; max=0.99: very few space for the seats)

All the mouse and touch events that can be thrown on the circles that will represent the seats are available : click, dblclick, mousedown, mouseenter, mouseleave, mousemove, mouseout, mouseover, mouseup, touchcancel, touchend, touchmove, touchstart

You can register event listeners calling on. The first parameter given to the event listener is an object containing the following fields:

• polar Object = The polar coordinates of the seat
  • r Number = radius
  • teta Number = angle
• cartesian Object = The cartesian coordinates of the seat, origin is centered on the bottom of the chart
  • x Number = number of pixels on x axe from the origin
  • y Number = number of pixels on y axe from the origin
• party Object = data of a party that you put in the array (see Data)
• data Object = data of this seat (see Data)

The data given to datum before calling parliament (see example) should be an array of objects, one object per party in the parliament. These objects should contain the fields:

• id String = the unique id of the party
• seats Array | Number = if it is a number, it is the number of seats for this party in the parliament ; if it is an Array, one element is a seat (or MP), you can put all you want in it (String, Object...), you will retrieve it as data field in your event listener.

Then, you can add more data if you want to retrieve them in your event listeners.

MIT License

• Check the data to avoid infinite loop or division by zero
• Animation enter from / exit to outside of the playground svg
• Other? Let me know!