clean up year display in x-axis of flot graph

20/10/11

Permalink 10:52:56 am, by sarneil, 216 words, 399 views   English (CA)
Categories: Activity Log; Mins. worked: 120

clean up year display in x-axis of flot graph

Previously, if there were more than 20 years in the range of returned data, the years appearing along the x-axis in the flot graph overwrote each other.
I changed the init-flot.js file by replacing this:

  xaxis: { 
    tickSize: 1,
    tickFormatter: function(val, axis) {
      if (!yearTotals[val]) {
        return val;
      } else {
        return val + '<br />' + yearTotals[val];
      }
    }
  }

with this:

  xaxis: { 
    ticks: 20,
    tickDecimals: 0,
    tickFormatter: function(val, axis) {
      return '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;' + val;
    }
  }

The ticks limits the number of years explicitly labelled to a maximum of 20, thus taking care of the overlapping year display on the x-axis when there are lots of years in the chart.
The tickDecimals controls whether fractions of years get ticks on the x-axis. For small year ranges, if this is not set to 0, you get values like 1744.5 appearing, which is nonsensical for this dataset.
Since not all years get a tick on the x-axis, it didn't seem to make sense to display the total hits, so I've removed that from the tickFormatter.
I prefer the year label to be left justified to the left side of the column in the graph, rather than centered on the left side of the column, so I added those spaces to push the date to the left.

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Capital Trials at the Old Bailey

Simon Devereaux has approximately 10,000 records of people convicted in potentially capital cases between 1710 and 1840 in London heard at the Old Bailey court. This project will create a web-based database which will allow interested researchers and members of the public to compose queries on that data (e.g. women charged with robbery 1710-1720). It must be able to support a range of queries and produce output allowing researchers to identify trends in judicial practice over that time.

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