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x_axis.js
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x_axis.js
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function x_axis(args) {
var svg = d3.select(args.target + ' svg');
var g;
var min_x;
var max_x;
args.scalefns.xf = function(di) {
return args.scales.X(di[args.x_accessor]);
}
var last_i;
if(args.chart_type == 'line') {
for(var i=0; i<args.data.length; i++) {
last_i = args.data[i].length-1;
if(args.data[i][0][args.x_accessor] < min_x || !min_x)
min_x = args.data[i][0][args.x_accessor];
if(args.data[i][last_i][args.x_accessor] > max_x || !max_x)
max_x = args.data[i][last_i][args.x_accessor];
}
}
else if(args.chart_type == 'point') {
max_x = d3.max(args.data[0], function(d){return d[args.x_accessor]});
min_x = d3.min(args.data[0], function(d){return d[args.x_accessor]});
}
else if(args.chart_type == 'histogram') {
min_x = d3.min(args.data[0], function(d){return d[args.x_accessor]});
max_x = d3.max(args.data[0], function(d){return d[args.x_accessor]});
//force override xax_format
//todo revisit to see if this makes sense
args.xax_format = function(f) {
if (f < 1.0) {
//don't scale tiny values
return args.yax_units + d3.round(f, args.decimals);
}
else {
var pf = d3.formatPrefix(f);
return args.xax_units + pf.scale(f) + pf.symbol;
}
}
}
else if(args.chart_type = 'bar') {
//min_x = d3.min(args.data[0], function(d){return d[args.value_accessor]});
min_x = 0; // TODO: think about what actually makes sense.
max_x = d3.max(args.data[0], function(d){return d[args.x_accessor]});
args.xax_format = function(f) {
if (f < 1.0) {
//don't scale tiny values
return args.yax_units + d3.round(f, args.decimals);
}
else {
var pf = d3.formatPrefix(f);
return args.xax_units + pf.scale(f) + pf.symbol;
}
}
}
min_x = args.min_x ? args.min_x : min_x;
max_x = args.max_x ? args.max_x : max_x;
args.x_axis_negative = false;
if (!args.time_series) {
if (min_x < 0){
min_x = min_x - (max_x * (args.inflator-1));
args.x_axis_negative = true;
}
}
// this is for some charts that might need additional buffer, such as the bar chart.
var additional_buffer;
if (args.chart_type == 'bar'){
additional_buffer = args.buffer*5;
} else {
additional_buffer = 0;
}
args.scales.X = (args.time_series)
? d3.time.scale()
: d3.scale.linear();
args.scales.X
.domain([min_x, max_x])
.range([args.left + args.buffer, args.width - args.right - args.buffer - additional_buffer]);
//remove the old x-axis, add new one
if($(args.target + ' svg .x-axis').length > 0) {
$(args.target + ' svg .x-axis')
.remove();
}
if (!args.x_axis) return this;
//x axis
g = svg.append('g')
.classed('x-axis', true)
.classed('x-axis-small', args.use_small_class);
var last_i = args.scales.X.ticks(args.xax_count).length-1;
//are we adding a label?
if(args.x_label) {
g.append('text')
.attr('class', 'label')
.attr('x', function() {
return args.left + args.buffer
+ ((args.width - args.right - args.buffer)
- (args.left + args.buffer)) / 2;
})
.attr('y', args.height - args.bottom / 2)
.attr('dy', '.50em')
.attr('text-anchor', 'middle')
.text(function(d) {
return args.x_label;
})
}
if(args.chart_type != 'bar' && !args.x_extended_ticks && !args.y_extended_ticks) {
//extend axis line across bottom, rather than from domain's min..max
g.append('line')
.attr('x1',
(args.concise == false || args.xax_count == 0)
? args.left + args.buffer
: args.scales.X(args.scales.X.ticks(args.xax_count)[0])
)
.attr('x2',
(args.concise == false || args.xax_count == 0)
? args.width - args.right - args.buffer
: args.scales.X(args.scales.X.ticks(args.xax_count)[last_i])
)
.attr('y1', args.height - args.bottom)
.attr('y2', args.height - args.bottom);
}
//add x ticks
g.selectAll('.xax-ticks')
.data(args.scales.X.ticks(args.xax_count)).enter()
.append('line')
.attr('x1', args.scales.X)
.attr('x2', args.scales.X)
.attr('y1', args.height - args.bottom)
.attr('y2', function() {
return (args.x_extended_ticks)
? args.top
: args.height - args.bottom + args.xax_tick;
})
.attr('class', function() {
if(args.x_extended_ticks)
return 'extended-x-ticks';
});
g.selectAll('.xax-labels')
.data(args.scales.X.ticks(args.xax_count)).enter()
.append('text')
.attr('x', args.scales.X)
.attr('y', args.height - args.bottom + args.xax_tick * 7 / 3)
.attr('dy', '.50em')
.attr('text-anchor', 'middle')
.text(function(d) {
return args.xax_units + args.xax_format(d);
})
//are we adding years to x-axis
if (args.time_series && args.show_years) {
var min_x;
var max_x;
for (var i=0; i<args.data.length; i++) {
last_i = args.data[i].length-1;
if(args.data[i][0][args.x_accessor] < min_x || !min_x)
min_x = args.data[i][0][args.x_accessor];
if(args.data[i][last_i][args.x_accessor] > max_x || !max_x)
max_x = args.data[i][last_i][args.x_accessor];
}
var years = d3.time.years(min_x, max_x);
if (years.length == 0){
var first_tick = args.scales.X.ticks(args.xax_count)[0];
years = [first_tick];
}
//append year marker to x-axis group
g = g.append('g')
.classed('year-marker', true)
.classed('year-marker-small', args.use_small_class);
g.selectAll('.year_marker')
.data(years).enter()
.append('line')
.attr('x1', args.scales.X)
.attr('x2', args.scales.X)
.attr('y1', args.top)
.attr('y2', args.height - args.bottom);
var yformat = d3.time.format('%Y');
g.selectAll('.year_marker')
.data(years).enter()
.append('text')
.attr('x', args.scales.X)
.attr('y', args.height - args.buffer + args.xax_tick)
.attr('dy', args.use_small_class ? -3 : (args.y_extended_ticks) ? -6 : 0 )
.attr('text-anchor', 'middle')
.text(function(d) {
return yformat(d);
});
};
return this;
}