|
function columnChart() { |
|
var margin = {top: 30, right: 10, bottom: 50, left: 50}, |
|
width = 420, |
|
height = 420, |
|
xRoundBands = 0.2, |
|
xValue = function(d) { return d[0]; }, |
|
yValue = function(d) { return d[1]; }, |
|
xScale = d3.scale.ordinal(), |
|
yScale = d3.scale.linear(), |
|
yAxis = d3.svg.axis().scale(yScale).orient("left"), |
|
xAxis = d3.svg.axis().scale(xScale); |
|
|
|
|
|
function chart(selection) { |
|
selection.each(function(data) { |
|
|
|
// Convert data to standard representation greedily; |
|
// this is needed for nondeterministic accessors. |
|
data = data.map(function(d, i) { |
|
return [xValue.call(data, d, i), yValue.call(data, d, i)]; |
|
}); |
|
|
|
// Update the x-scale. |
|
xScale |
|
.domain(data.map(function(d) { return d[0];} )) |
|
.rangeRoundBands([0, width - margin.left - margin.right], xRoundBands); |
|
|
|
|
|
// Update the y-scale. |
|
yScale |
|
.domain(d3.extent(data.map(function(d) { return d[1];} ))) |
|
.range([height - margin.top - margin.bottom, 0]) |
|
.nice(); |
|
|
|
|
|
// Select the svg element, if it exists. |
|
var svg = d3.select(this).selectAll("svg").data([data]); |
|
|
|
// Otherwise, create the skeletal chart. |
|
var gEnter = svg.enter().append("svg").append("g"); |
|
gEnter.append("g").attr("class", "bars"); |
|
gEnter.append("g").attr("class", "y axis"); |
|
gEnter.append("g").attr("class", "x axis"); |
|
gEnter.append("g").attr("class", "x axis zero"); |
|
|
|
// Update the outer dimensions. |
|
svg .attr("width", width) |
|
.attr("height", height); |
|
|
|
// Update the inner dimensions. |
|
var g = svg.select("g") |
|
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
|
|
|
// Update the bars. |
|
var bar = svg.select(".bars").selectAll(".bar").data(data); |
|
bar.enter().append("rect"); |
|
bar.exit().remove(); |
|
bar .attr("class", function(d, i) { return d[1] < 0 ? "bar negative" : "bar positive"; }) |
|
.attr("x", function(d) { return X(d); }) |
|
.attr("y", function(d, i) { return d[1] < 0 ? Y0() : Y(d); }) |
|
.attr("width", xScale.rangeBand()) |
|
.attr("height", function(d, i) { return Math.abs( Y(d) - Y0() ); }); |
|
|
|
// x axis at the bottom of the chart |
|
g.select(".x.axis") |
|
.attr("transform", "translate(0," + (height - margin.top - margin.bottom) + ")") |
|
.call(xAxis.orient("bottom")); |
|
|
|
// zero line |
|
g.select(".x.axis.zero") |
|
.attr("transform", "translate(0," + Y0() + ")") |
|
.call(xAxis.tickFormat("").tickSize(0)); |
|
|
|
|
|
// Update the y-axis. |
|
g.select(".y.axis") |
|
.call(yAxis); |
|
|
|
}); |
|
} |
|
|
|
|
|
// The x-accessor for the path generator; xScale ∘ xValue. |
|
function X(d) { |
|
return xScale(d[0]); |
|
} |
|
|
|
function Y0() { |
|
return yScale(0); |
|
} |
|
|
|
// The x-accessor for the path generator; yScale ∘ yValue. |
|
function Y(d) { |
|
return yScale(d[1]); |
|
} |
|
|
|
chart.margin = function(_) { |
|
if (!arguments.length) return margin; |
|
margin = _; |
|
return chart; |
|
}; |
|
|
|
chart.width = function(_) { |
|
if (!arguments.length) return width; |
|
width = _; |
|
return chart; |
|
}; |
|
|
|
chart.height = function(_) { |
|
if (!arguments.length) return height; |
|
height = _; |
|
return chart; |
|
}; |
|
|
|
chart.x = function(_) { |
|
if (!arguments.length) return xValue; |
|
xValue = _; |
|
return chart; |
|
}; |
|
|
|
chart.y = function(_) { |
|
if (!arguments.length) return yValue; |
|
yValue = _; |
|
return chart; |
|
}; |
|
|
|
return chart; |
|
} |
This is a fantastic time saver! Thanks! Is it possible to modify ticks and tick format? I'm new to D3, still getting my head around how to get at these.