160 lines
3.4 KiB
HTML
160 lines
3.4 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<title>Bar Chart - Numeric Keys</title>
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<script src="https://d3js.org/d3.v7.min.js"></script>
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<style>
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body {
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font-family: sans-serif;
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margin: 40px;
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}
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.bar {
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fill: steelblue;
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stroke: black;
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stroke-width: 1px;
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}
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.axis path,
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.axis line {
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stroke: black;
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shape-rendering: crispEdges;
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}
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</style>
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</head>
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<body>
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<svg width="600" height="250"></svg>
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<script>
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const svg = d3.select("svg");
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const width = +svg.attr("width");
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const height = +svg.attr("height");
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const margin = { top: 40, right: 30, bottom: 60, left: 30 };
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const data = {
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"-3": 0,
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"-2": 1,
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"-1": 3,
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"0": 0,
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"1": 2,
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"2": 0,
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"3": 10
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};
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const dataArray = Object.entries(data).map(([key, count]) => ({
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key: +key,
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count: count
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}));
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const x = d3.scaleBand()
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.domain([-3,-2,-1,0,1,2,3])
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.range([margin.left, width - margin.right])
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.padding(0);
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const y = d3.scaleLinear()
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.domain([0, d3.max(dataArray, d => d.count)])
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.nice()
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.range([height - margin.bottom, margin.top]);
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// X Axis
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svg.append("g")
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.attr("transform", `translate(0,${height - margin.bottom})`)
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.call(d3.axisBottom(x)
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.tickSize(0))
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.selectAll("text")
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.attr("x", 0)
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.attr("y", 10)
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.style("text-anchor", "middle")
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.style("font-size", "12px");
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// Add the required ticks
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const xTicks = d3.scaleLinear()
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.domain([-3.5, 3.5])
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.range([margin.left, width - margin.right]);
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svg.append("g")
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.attr("transform", `translate(0,${height - margin.bottom})`)
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.call(d3.axisBottom(xTicks).tickValues(d3.range(-3.5, 4, 1)))
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.selectAll("text")
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.style("visibility", "hidden"); // This hides the labels
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// Y Axis
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//svg.append("g")
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// .attr("transform", `translate(${margin.left},0)`)
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// .call(d3.axisLeft(y).ticks(5));
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// Bars
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svg.selectAll(".bar")
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.data(dataArray)
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.enter()
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.append("rect")
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.attr("class", "bar")
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.attr("x", d => x(d.key))
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.attr("y", d => y(d.count))
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.attr("width", x.bandwidth())
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.attr("height", d => y(0) - y(d.count));
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// Labels
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svg.selectAll(".label")
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.data(dataArray)
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.enter()
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.append("text")
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.attr("x", d => x(d.key) + x.bandwidth() / 2)
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.attr("y", d => d.count > 0 ? y(d.count) - 5 : y(0))
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.attr("text-anchor", "middle")
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.attr("font-size", "12px")
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.attr("fill", "black")
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.text(d => d.count > 0 ? d.count : "");
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// Average line
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const format = d3.format(".2f");
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const totalCount = d3.sum(dataArray, d => d.count);
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const weightedSum = d3.sum(dataArray, d => d.key * d.count);
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const average = totalCount > 0 ? format(weightedSum / totalCount) : 0;
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const xLinear = d3.scaleLinear()
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.domain([-3, 3])
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.range([margin.left + x.bandwidth() / 2, width - margin.right - x.bandwidth() / 2]);
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const avgX = xLinear(average);
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svg.append("line")
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.attr("x1", avgX)
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.attr("x2", avgX)
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.attr("y1", y(0))
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.attr("y2", y(d3.max(dataArray, d => d.count)) - 20)
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.attr("stroke", "red")
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.attr("stroke-width", 2)
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.attr("stroke-dasharray", "4,2");
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svg.append("text")
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.attr("x", avgX)
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.attr("y", y(d3.max(dataArray, d => d.count)) - 30)
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.attr("text-anchor", "middle")
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.attr("fill", "red")
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.attr("font-size", "12px")
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.text("Average ("+average+")");
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// Title beneath the graph
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svg.append("text")
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.attr("x", width / 2)
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.attr("y", height - 5) // Just below the x-axis
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.attr("text-anchor", "middle")
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.attr("font-size", "14px")
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.attr("fill", "black")
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.text("Demo bar graph");
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</script>
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</body>
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</html>
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