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// Based on: //https://github.com/benalexkeen/d3-flask-blog-post/blob/master/templates/index.html
// And: https://bl.ocks.org/mbostock/35964711079355050ff1
function preprocessData(data) {
var n = 0;
data.forEach(function(d) {
d.X = n++;
d.Y = d.value;
});
}
function scaleAndAxis(data, width, height) {
// xScale is the active scale used for zooming, xScaleOrig is used as
// the original scale that is never changed.
var xScale = d3.scaleLinear().range([0, width]);
var xScaleOrig = d3.scaleLinear().range([0, width]);
var yScale = d3.scaleLinear().range([height, 0]);
// create the axes
var xAxis = d3.axisBottom(xScale);
var yAxis = d3.axisLeft(yScale);
// turn off ticks on the y axis. We don't want annotators to be
// influenced by whether a change is big in the absolute sense.
yAxis.ticks(0);
// compute the domains for the axes
var xExtent = d3.extent(data, function(d) { return d.X; });
var xRange = xExtent[1] - xExtent[0];
var xDomainMin = xExtent[0] - xRange * 0.02;
var xDomainMax = xExtent[1] + xRange * 0.02;
var yExtent = d3.extent(data, function(d) { return d.Y; });
var yRange = yExtent[1] - yExtent[0];
var yDomainMin = yExtent[0] - yRange * 0.05;
var yDomainMax = yExtent[1] + yRange * 0.05;
// set the axis domains
xScale.domain([xDomainMin, xDomainMax]);
xScaleOrig.domain([xDomainMin, xDomainMax]);
yScale.domain([yDomainMin, yDomainMax]);
return [xAxis, yAxis, xScale, xScaleOrig, yScale, yDomainMin, yDomainMax];
}
function noZoom() {
d3.event.preventDefault();
}
function baseChart(selector, data, clickFunction, annotations, annotationFunction) {
// preprocess the data
preprocessData(data);
var divWidth = 1000;
var divHeight = 480;
var svg = d3.select(selector)
.on("touchstart", noZoom)
.on("touchmove", noZoom)
.append("svg")
.attr("width", divWidth)
.attr("height", divHeight)
.attr("viewBox", "0 0 " + divWidth + " " + divHeight);
var margin = {top: 20, right: 20, bottom: 50, left: 50};
var width = +svg.attr("width") - margin.left - margin.right;
var height = +svg.attr("height") - margin.top - margin.bottom;
var [xAxis, yAxis, xScale, xScaleOrig, yScale, yDomainMin, yDomainMax] = scaleAndAxis(
data,
width,
height);
// Create the line object
var lineObj = d3.line()
.x(function(d) { return xScale(d.X); })
.y(function(d) { return yScale(d.Y); });
// Initialise the zoom behaviour
var zoomObj = d3.zoom()
.scaleExtent([1, 50])
.translateExtent([[0, 0], [width, height]])
.extent([[0, 0], [width, height]])
.on("zoom", zoomTransform);
function zoomTransform() {
transform = d3.event.transform;
// transform the axis
xScale.domain(transform.rescaleX(xScaleOrig).domain());
// transform the data line
svg.select(".line").attr("d", lineObj);
// transform the circles
points.data(data)
.attr("cx", function(d) { return xScale(d.X); })
.attr("cy", function(d) { return yScale(d.Y); });
// transform the annotation lines (if any)
annoLines = gView.selectAll("line");
annoLines._groups[0].forEach(function(l) {
l.setAttribute("x1", xScale(l.getAttribute("cp_idx")));
l.setAttribute("x2", xScale(l.getAttribute("cp_idx")));
});
svg.select(".axis--x").call(xAxis);
}
// Build the SVG layer cake
// There are a few elements to this:
//
// 1. a clip path that ensures elements aren't drawn outside the
// axes. This is activated with css
// 2. axes and x axis label
// 3. wrapper "g" element with the zoom event
// 3. rectangle to keep the drawing
// 4. line
// 5. circles with a click event
//
// clip path
svg.append("defs")
.append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width - 18)
.attr("height", height)
.attr("transform", "translate(" + 18 + ",0)");
// y axis
svg.append("g")
.attr("class", "axis axis--y")
.attr("transform", "translate(" + 18 + ",0)")
.call(yAxis);
// x axis
svg.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0, " + height + ")")
.call(xAxis);
// x axis label
svg.append("text")
.attr("text-anchor", "middle")
.attr("class", "axis-label")
.attr("transform", "translate(" + (width - 20) + "," + (height + 50) + ")")
.text("Time");
// wrapper for zoom
var gZoom = svg.append("g").call(zoomObj);
// rectangle for the graph area
gZoom.append("rect")
.attr("width", width)
.attr("height", height);
// view for the graph
var gView = gZoom.append("g")
.attr("class", "view");
// add the line to the view
gView.append("path")
.datum(data)
.attr("class", "line")
.attr("d", lineObj);
// add the points to the view
var points = gView.selectAll("circle")
.data(data)
.enter()
.append("circle")
.attr("cx", function(d) { return xScale(d.X); })
.attr("cy", function(d) { return yScale(d.Y); })
.attr("data_X", function(d) { return d.X; })
.attr("data_Y", function(d) { return d.Y; })
.attr("r", 5)
.on("click", function(d, i) {
d.element = this;
return clickFunction(d, i);
});
// handle the annotations
annotations.forEach(function(a) {
for (i=0; i<points._groups[0].length; i++) {
p = points._groups[0][i];
if (p.getAttribute("data_X") != a.index)
continue;
var elem = d3.select(p);
annotationFunction(a, elem, gView, xScale, yScale, yDomainMin, yDomainMax);
}
});
}
function annotateChart(selector, data) {
function handleClick(d, i) {
if (d3.event.defaultPrevented) return; // zoomed
var elem = d3.select(d.element);
if (elem.classed("changepoint")) {
elem.style("fill", null);
elem.classed("changepoint", false);
} else {
elem.style("fill", "red");
elem.classed("changepoint", true);
}
updateTable();
}
baseChart(selector, data, handleClick, [], null);
}
function viewAnnotations(selector, data, annotations) {
function handleAnnotation(ann, elem, view, xScale, yScale, yDomainMin, yDomainMax) {
elem.classed("marked", true);
view.append("line")
.attr("cp_idx", ann.index)
.attr("y1", yScale(yDomainMax))
.attr("y2", yScale(yDomainMin))
.attr("x1", xScale(ann.index))
.attr("x2", xScale(ann.index))
.attr("class", "ann-line");
}
baseChart(selector, data, function() {}, annotations, handleAnnotation);
}
function adminViewAnnotations(selector, data, annotations) {
function handleAnnotation(ann, elem, view, xScale, yScale, yDomainMin, yDomainMax) {
elem.classed(ann.user, true);
view.append("line")
.attr("cp_idx", ann.index)
.attr("y1", yScale(yDomainMax))
.attr("y2", yScale(yDomainMin))
.attr("x1", xScale(ann.index))
.attr("x2", xScale(ann.index))
.attr("class", "ann-line" + " " + ann.user);
}
baseChart(selector, data, function() {}, annotations, handleAnnotation);
}
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