Bubble chart

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\n \n \n\n","bubbleChart.js","// set the dimensions and margins of the graph\nconst bc_margin = {\n top: 50,\n right: 400,\n bottom: 45,\n left: 75,\n },\n bc_width = 945 - bc_margin.left - bc_margin.right,\n bc_height = 472 - bc_margin.top - bc_margin.bottom;\n\n// append the svg object to the body of the page\nconst bc_svg = d3\n .select('#bubble_chart')\n .append('svg')\n .attr(\n 'width',\n bc_width + bc_margin.left + bc_margin.right,\n )\n .attr(\n 'height',\n bc_height + bc_margin.top + bc_margin.bottom,\n )\n .append('g')\n .attr(\n 'transform',\n `translate(${bc_margin.left},${bc_margin.top})`,\n );\n\n// read the data\nd3.csv('bubblechart.csv').then((data) => {\n // add chart title\n bc_svg\n .append('text')\n .attr('x', bc_width / 2)\n .attr('y', -20)\n .attr('text-anchor', 'middle')\n .style('font-size', '22px')\n .text('Population vs. Average Income by City');\n\n // add x axis\n const x = d3\n .scaleLinear()\n .domain([0, d3.max(data, (d) => +d.avg_income_usd)])\n .range([0, bc_width]);\n bc_svg\n .append('g')\n .attr('transform', `translate(0, ${bc_height})`)\n .call(d3.axisBottom(x));\n\n // add x axis label\n bc_svg\n .append('text')\n .attr('text-anchor', 'middle')\n .attr('x', bc_width / 2)\n .attr('y', bc_height + 40)\n .text('Average Income (USD)');\n\n // add y axis\n const y = d3\n .scaleLinear()\n .domain([0, d3.max(data, (d) => +d.population)])\n .range([bc_height, 0]);\n bc_svg.append('g').call(d3.axisLeft(y));\n\n // add y axis label:\n bc_svg\n .append('text')\n .attr('text-anchor', 'middle')\n .attr('x', -bc_height / 2)\n .attr('y', -50)\n .text('Population')\n .attr('transform', 'rotate(-90)');\n\n // add a scale for bubble size\n const z = d3\n .scaleLinear()\n .domain([0, d3.max(data, (d) => +d.area_km2)])\n .range([1, 40]);\n\n // add a scale for bubble color\n const cityNames = Array.from(data, (d) => d.city);\n const cityColors = cityNames.map((el, i, arr) =>\n d3.interpolateTurbo(i / arr.length),\n );\n const myColor = d3\n .scaleOrdinal()\n .domain(cityNames)\n .range(cityColors);\n\n // ---------------------------//\n // tooltip //\n // ---------------------------//\n\n // -1- create a tooltip div that is hidden by default:\n const tooltip = d3\n .select('#bubble_chart')\n .append('div')\n .style('opacity', 0)\n .attr('class', 'tooltip')\n .style('background-color', 'black')\n .style('border-radius', '5px')\n .style('padding', '10px')\n .style('color', 'white')\n .style('font-family', 'sans-serif');\n\n // -2- create 3 functions to show / update (when mouse moves but stay on same circle) / hide the tooltip\n const showTooltip = (event, d) => {\n tooltip.transition().duration(200);\n tooltip\n .style('opacity', 1)\n .html('City: ' + d.city)\n .style('left', event.x + 25 + 'px')\n .style('top', event.y + 25 + 'px');\n };\n const moveTooltip = (event, d) => {\n tooltip\n .style('left', event.x + 25 + 'px')\n .style('top', event.y + 25 + 'px');\n };\n const hideTooltip = (event, d) => {\n tooltip.transition().duration(200).style('opacity', 0);\n };\n\n // add dots\n\n bc_svg\n .append('g')\n .selectAll('dot')\n .data(data)\n .join('circle')\n .attr('class', 'bubbles')\n .attr('cx', (d) => x(d.avg_income_usd))\n .attr('cy', (d) => y(d.population))\n .attr('r', (d) => z(d.area_km2))\n .style('fill', (d) => myColor(d.city))\n .attr('stroke', 'black')\n .on('mouseover', showTooltip)\n .on('mousemove', moveTooltip)\n .on('mouseleave', hideTooltip);\n\n // ---------------------------//\n // legend //\n // ---------------------------//\n\n // add legend: circles\n const valuesToShow = [20, 40];\n const xCircle = 745;\n const xLabel = 810;\n bc_svg\n .selectAll('legend')\n .data(valuesToShow)\n .join('circle')\n .attr('cx', xCircle)\n .attr('cy', (d) => bc_height - 100 - z(d))\n .attr('r', (d) => z(d))\n .style('fill', 'none')\n .attr('stroke', 'black');\n\n // add legend: segments\n bc_svg\n .selectAll('legend')\n .data(valuesToShow)\n .join('line')\n .attr('x1', (d) => xCircle + z(d))\n .attr('x2', xLabel)\n .attr('y1', (d) => bc_height - 100 - z(d))\n .attr('y2', (d) => bc_height - 100 - z(d))\n .attr('stroke', 'black')\n .style('stroke-dasharray', '2,2');\n\n // add legend: labels\n bc_svg\n .selectAll('legend')\n .data(valuesToShow)\n .join('text')\n .attr('x', xLabel)\n .attr('y', (d) => bc_height - 100 - z(d))\n .text((d) => d)\n .style('font-size', '14px')\n .attr('alignment-baseline', 'middle');\n\n // legend title\n bc_svg\n .append('text')\n .attr('x', xCircle)\n .attr('y', bc_height - 100 + 30)\n .text('Area (km^2)')\n .attr('text-anchor', 'middle');\n\n // add one dot in the legend for each city\n const size = 5;\n const allgroups = cityNames;\n bc_svg\n .selectAll('myrect')\n .data(allgroups)\n .join('circle')\n .attr('cx', 550)\n .attr('cy', (d, i) => 6 + i * (size + 7))\n .attr('r', 3)\n .style('fill', (d) => myColor(d));\n\n // add labels beside legend dots\n bc_svg\n .selectAll('mylabels')\n .data(allgroups)\n .enter()\n .append('text')\n .attr('x', 550 + size * 2)\n .attr('y', (d, i) => 10 + i * (size + 7))\n .style('fill', (d) => myColor(d))\n .text((d) => d)\n .attr('text-anchor', 'left')\n .style('alignment-baseline', 'middle')\n .style('font-size', '13px');\n});\n","bubblechart.csv","city,population,area_km2,avg_income_usd,avg_age\nNew York City,8398748,789,58750,36\nLos Angeles,3990456,1302,54600,35\nChicago,2705994,606,60000,34\nHouston,2320268,1659,62000,33\nPhoenix,1680992,1339,54000,32\nPhiladelphia,1584064,347,56800,35\nSan Antonio,1547253,1258,58000,32\nSan Diego,1423851,963,62500,34\nDallas,1343573,907,63000,33\nSan Jose,1030119,466,80000,36\nAustin,964254,839,71000,34\nJacksonville,903889,874,57000,33\nFort Worth,895008,904,61000,32\nColumbus,892533,576,58000,34\nCharlotte,872498,799,62000,35\nSan Francisco,883305,121,96000,38\nIndianapolis,867125,936,58000,33\nSeattle,753675,369,74000,36\nDenver,727211,401,72000,35\nWashington,705749,177,82000,37\nBoston,694583,125,81000,36\nEl Paso,682669,666,55000,32\nDetroit,672662,370,57000,34\nNashville,670820,475,63000,33\nPortland,653115,347,68000,35\nLas Vegas,644644,352,54000,33\nOklahoma City,649021,1607,58000,32\nMemphis,650618,839,52000,34\nLouisville,617638,1020,57000,33\nBaltimore,593490,238,62000,35\nMilwaukee,592025,250,58000,34\n","slug","Activity-8_Q4","description","ownerType","ownerId","projectId","visibility","public","isTemplate","headCommitId","c258c00402594f69a517c09c0982c9dc","startCommitId","918108528e214b149c2bd935331ce65e","forkedFrom","forkedFromVisibility",1713047674000,1713047885000,"publishedAt","isPublished","draftStatus","published","userId","account","appOrigin","https://next.vizhub.com","googleAnalyticsId","G-5BVJNTEF9V"]