Combining d3-brush and d3-zoom to implement Focus + Context. Another approach is to zoom to the brushed region.
forked from mbostock's block: Brush & Zoom
license: gpl-3.0 |
Combining d3-brush and d3-zoom to implement Focus + Context. Another approach is to zoom to the brushed region.
forked from mbostock's block: Brush & Zoom
<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.area { | |
fill: steelblue; | |
clip-path: url(#clip); | |
} | |
.zoom { | |
cursor: move; | |
fill: none; | |
pointer-events: all; | |
} | |
</style> | |
<svg width="960" height="500"></svg> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script> | |
var svg = d3.select("svg"), | |
margin = {top: 20, right: 20, bottom: 110, left: 40}, | |
margin2 = {top: 430, right: 20, bottom: 30, left: 40}, | |
width = +svg.attr("width") - margin.left - margin.right, | |
height = +svg.attr("height") - margin.top - margin.bottom, | |
height2 = +svg.attr("height") - margin2.top - margin2.bottom; | |
var parseDate = d3.timeParse("%b %Y"); | |
var x = d3.scaleTime().range([0, width]), | |
x2 = d3.scaleTime().range([0, width]), | |
y = d3.scaleLinear().range([height, 0]), | |
y2 = d3.scaleLinear().range([height2, 0]); | |
var xAxis = d3.axisBottom(x), | |
xAxis2 = d3.axisBottom(x2), | |
yAxis = d3.axisLeft(y); | |
var brush = d3.brushX() | |
.extent([[0, 0], [width, height2]]) | |
.on("brush end", brushed); | |
var zoom = d3.zoom() | |
.scaleExtent([1, Infinity]) | |
.translateExtent([[0, 0], [width, height]]) | |
.extent([[0, 0], [width, height]]) | |
.on("zoom", zoomed); | |
var area = d3.area() | |
.curve(d3.curveMonotoneX) | |
.x(function(d) { return x(d.date); }) | |
.y0(height) | |
.y1(function(d) { return y(d.price); }); | |
var area2 = d3.area() | |
.curve(d3.curveMonotoneX) | |
.x(function(d) { return x2(d.date); }) | |
.y0(height2) | |
.y1(function(d) { return y2(d.price); }); | |
svg.append("defs").append("clipPath") | |
.attr("id", "clip") | |
.append("rect") | |
.attr("width", width) | |
.attr("height", height); | |
var focus = svg.append("g") | |
.attr("class", "focus") | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
var context = svg.append("g") | |
.attr("class", "context") | |
.attr("transform", "translate(" + margin2.left + "," + margin2.top + ")"); | |
d3.csv("sp500.csv", type, function(error, data) { | |
if (error) throw error; | |
x.domain(d3.extent(data, function(d) { return d.date; })); | |
y.domain([0, d3.max(data, function(d) { return d.price; })]); | |
x2.domain(x.domain()); | |
y2.domain(y.domain()); | |
focus.append("path") | |
.datum(data) | |
.attr("class", "area") | |
.attr("d", area); | |
focus.append("g") | |
.attr("class", "axis axis--x") | |
.attr("transform", "translate(0," + height + ")") | |
.call(xAxis); | |
focus.append("g") | |
.attr("class", "axis axis--y") | |
.call(yAxis); | |
context.append("path") | |
.datum(data) | |
.attr("class", "area") | |
.attr("d", area2); | |
context.append("g") | |
.attr("class", "axis axis--x") | |
.attr("transform", "translate(0," + height2 + ")") | |
.call(xAxis2); | |
context.append("g") | |
.attr("class", "brush") | |
.call(brush) | |
.call(brush.move, x.range()); | |
svg.append("rect") | |
.attr("class", "zoom") | |
.attr("width", width) | |
.attr("height", height) | |
.attr("transform", "translate(" + margin.left + "," + margin.top + ")") | |
.call(zoom); | |
}); | |
function brushed() { | |
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom | |
var s = d3.event.selection || x2.range(); | |
x.domain(s.map(x2.invert, x2)); | |
focus.select(".area").attr("d", area); | |
focus.select(".axis--x").call(xAxis); | |
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity | |
.scale(width / (s[1] - s[0])) | |
.translate(-s[0], 0)); | |
} | |
function zoomed() { | |
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush | |
var t = d3.event.transform; | |
x.domain(t.rescaleX(x2).domain()); | |
focus.select(".area").attr("d", area); | |
focus.select(".axis--x").call(xAxis); | |
context.select(".brush").call(brush.move, x.range().map(t.invertX, t)); | |
} | |
function type(d) { | |
d.date = parseDate(d.date); | |
d.price = +d.price; | |
return d; | |
} | |
</script> |
�PNG | |