129 lines
4.0 KiB
JavaScript
129 lines
4.0 KiB
JavaScript
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var TestChart = {
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init: function(){
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var svg = d3.select("svg"),
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margin = {top: 20, right: 20, bottom: 110, left: 40},
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margin2 = {top: 430, right: 20, bottom: 30, left: 40},
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width = +svg.attr("width") - margin.left - margin.right,
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height = +svg.attr("height") - margin.top - margin.bottom,
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height2 = +svg.attr("height") - margin2.top - margin2.bottom;
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var parseDate = d3.timeParse("%b %Y");
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var x = d3.scaleTime().range([0, width]),
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x2 = d3.scaleTime().range([0, width]),
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y = d3.scaleLinear().range([height, 0]),
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y2 = d3.scaleLinear().range([height2, 0]);
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var xAxis = d3.axisBottom(x),
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xAxis2 = d3.axisBottom(x2),
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yAxis = d3.axisLeft(y);
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var brush = d3.brushX()
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.extent([[0, 0], [width, height2]])
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.on("brush end", brushed);
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var zoom = d3.zoom()
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.scaleExtent([1, Infinity])
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.translateExtent([[0, 0], [width, height]])
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.extent([[0, 0], [width, height]])
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.on("zoom", zoomed);
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var area = d3.area()
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.curve(d3.curveMonotoneX)
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.x(function(d) { return x(d.date); })
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.y0(height)
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.y1(function(d) { return y(d.price); });
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var area2 = d3.area()
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.curve(d3.curveMonotoneX)
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.x(function(d) { return x2(d.date); })
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.y0(height2)
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.y1(function(d) { return y2(d.price); });
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svg.append("defs").append("clipPath")
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.attr("id", "clip")
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.append("rect")
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.attr("width", width)
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.attr("height", height);
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var focus = svg.append("g")
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.attr("class", "focus")
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
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var context = svg.append("g")
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.attr("class", "context")
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.attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");
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d3.csv("sp500.csv", type, function(error, data) {
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if (error) throw error;
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x.domain(d3.extent(data, function(d) { return d.date; }));
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y.domain([0, d3.max(data, function(d) { return d.price; })]);
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x2.domain(x.domain());
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y2.domain(y.domain());
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focus.append("path")
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.datum(data)
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.attr("class", "area")
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.attr("d", area);
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focus.append("g")
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.attr("class", "axis axis--x")
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.attr("transform", "translate(0," + height + ")")
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.call(xAxis);
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focus.append("g")
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.attr("class", "axis axis--y")
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.call(yAxis);
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context.append("path")
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.datum(data)
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.attr("class", "area")
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.attr("d", area2);
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context.append("g")
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.attr("class", "axis axis--x")
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.attr("transform", "translate(0," + height2 + ")")
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.call(xAxis2);
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context.append("g")
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.attr("class", "brush")
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.call(brush)
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.call(brush.move, x.range());
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svg.append("rect")
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.attr("class", "zoom")
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.attr("width", width)
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.attr("height", height)
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
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.call(zoom);
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});
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function brushed() {
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if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
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var s = d3.event.selection || x2.range();
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x.domain(s.map(x2.invert, x2));
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focus.select(".area").attr("d", area);
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focus.select(".axis--x").call(xAxis);
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svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
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.scale(width / (s[1] - s[0]))
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.translate(-s[0], 0));
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}
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function zoomed() {
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if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
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var t = d3.event.transform;
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x.domain(t.rescaleX(x2).domain());
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focus.select(".area").attr("d", area);
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focus.select(".axis--x").call(xAxis);
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context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
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}
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function type(d) {
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d.date = parseDate(d.date);
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d.price = +d.price;
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return d;
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}
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}, //ENDOF TestChart()
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}
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