zeus.ugent.be/content/assets/scripts/datavis/timeSlider.js

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(function() {
function timeSlider() {
var data;
var sliderValue;
var updateSlider;
var updateData;
let width = 50;
let midPoint = width / 2;
let domain = [moment().subtract(1, 'year').toDate(), moment().toDate()]
const dispatch = d3.dispatch('slide');
var margin = { top: 2, right: 40, bottom: 20, left: 40 };
function my(svg) {
let xScale;
let tWidth = $(svg.node()).width();
let tHeight = $(svg.node()).height();
tWidth -= margin.left + margin.right;
tHeight -= margin.top + margin.bottom;
const g = svg.append('g')
.attr("transform", `translate(${margin.left}, ${margin.top})`);
const gAxis = g.append('g');
// Create the svg:defs element and the main gradient definition.
var svgDefs = g.append('defs');
var mainGradient = svgDefs.append('linearGradient')
.attr('id', 'mainGradient');
// Create the stops of the main gradient. Each stop will be assigned
// a class to style the stop using CSS.
mainGradient.append('stop')
.attr('stop-opacity', '0')
.attr('offset', '0%');
mainGradient.append('stop')
.attr('stop-color', 'blue')
.attr('stop-opacity', '1')
.attr('offset', '45%');
mainGradient.append('stop')
.attr('stop-color', 'blue')
.attr('stop-opacity', '1')
.attr('offset', '55%');
mainGradient.append('stop')
.attr('stop-opacity', '0')
.attr('offset', '100%');
updateData = function (data, updateDomain) {
if (updateDomain) {
domain = d3.extent(data);
}
xScale = d3.scaleTime()
.domain(domain)
.range([0, tWidth])
.nice()
;
const xAxis = d3.axisBottom(xScale)
.tickFormat(d3.timeFormat("%b '%y"))
;
gAxis
.attr('transform', 'translate(0,' + 50 + ')')
.classed('x axis', true)
.call(xAxis)
.selectAll("text")
;
const sliderHeatmap = g.selectAll('rect.heatTick').data(data, d => d);
sliderHeatmap.exit().transition().attr('height', 0).remove();
sliderHeatmap.enter().append('rect')
.attr('x', e => xScale(e))
.attr('class', 'heatTick')
.attr('fill', 'blue')
.attr('width', 3)
.attr('height', 0)
.attr('fill-opacity', 0.2)
.transition()
.attr('height', 50)
;
}
updateData(data);
const outer = g.append('rect')
.attr('stroke', 'black')
.attr('fill-opacity', 0)
.attr('stroke-width', 1)
.attr('width', tWidth)
.attr('height', 50);
const t1 = g.append('text')
.attr('font-size', '.6em')
.attr('y', 50);
const t2 = g.append('text')
.attr('font-size', '.6em')
.attr('y', 50);
const inner = g.append('rect')
.attr('stroke', 'black')
.attr('fill-opacity', 0)
.attr('stroke-width', 2)
.attr('width', 50)
.attr('height', width)
.call(d3.drag()
.on("drag", function (d) {
const dx = d3.event.dx;
const dy = d3.event.dy;
let nx = midPoint + dx - width / 2;
width -= 1.5 * dy;
width = Math.max(10, width);
nx += 1.5 * dy / 2;
nx = Math.min(tWidth - width, nx);
nx = Math.max(0, nx);
midPoint = nx + width / 2;
width = Math.min(width, tWidth);
const beginTime = xScale.invert(nx);
const endTime = xScale.invert(nx + width);
sliderValue = [beginTime, endTime];
updateSlider(sliderValue);
dispatch.call('slide', this, sliderValue);
}));
updateSlider = function (value) {
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sliderValue = value
nx = xScale(sliderValue[0]);
width = xScale(sliderValue[1]) - xScale(sliderValue[0]);
midPoint = nx + width / 2;
inner.attr('x', nx)
.attr('width', width);
const fmtStr = 'DD/MM/YY'
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t1.text(moment(sliderValue[0]).format(fmtStr))
.attr('x', nx)
.attr('transform', `rotate(45 ${nx},50) translate(20,20)`);
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t2.text(moment(sliderValue[1]).format(fmtStr))
.attr('x', nx + width)
.attr('transform', `rotate(45 ${nx + width},50) translate(20,20)`);
}
updateSlider(xScale.domain());
}
my.on = function () {
let value = dispatch.on.apply(dispatch, arguments);
return value === dispatch ? my : value;
}
my.domain = function (value) {
if (!arguments.length) return domain;
domain = value;
if (typeof updateData === 'function') updateData(data);
return my;
}
my.slider = function (value) {
if (!arguments.length) return sliderValue;
if (typeof updateSlider === 'function') updateSlider(value);
return my;
}
my.data = function (dt) {
if (!arguments.length) return intensity;
data = dt
if (typeof updateData === 'function') updateData(data);
return my;
}
return my;
}
window['timeSlider'] = timeSlider;
})();