Bubble chart

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\n \n \n\n","index.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(\n 'Correlation Between Torque, Horsepower, and MPG',\n );\n\n // add x axis\n const x = d3\n .scaleLinear()\n .domain([100, 700])\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('Avg. Horsepower');\n\n // add y axis\n const y = d3\n .scaleLinear()\n .domain([0, 800])\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('Avg. Torque')\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.highway_mpg)])\n .range([1, 40]);\n\n // add a scale for bubble color\n const makes = Array.from(data, (d) => d.make);\n const makeColors = makes.map((el, i, arr) =>\n d3.interpolateTurbo(i / arr.length),\n );\n const myColor = d3\n .scaleOrdinal()\n .domain(makes)\n .range(makeColors);\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('Make: ' + d.make)\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.horsepower))\n .attr('cy', (d) => y(d.torque))\n .attr('r', (d) => z(d.highway_mpg))\n .style('fill', (d) => myColor(d.make))\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('Highway MPG')\n .attr('text-anchor', 'middle');\n\n // add one dot in the legend for each name\n const size = 5;\n const allgroups = makes;\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","slug","Activity8_Task-4","description","ownerType","ownerId","projectId","visibility","public","isTemplate","headCommitId","eb09938160254725a340449ad0a2e143","startCommitId","033a2b2a13c74e7ca3d993e353749cbf","forkedFrom","forkedFromVisibility",1713150363000,1713150499000,"publishedAt","isPublished","draftStatus","published","userId","account","appOrigin","https://next.vizhub.com","googleAnalyticsId","G-5BVJNTEF9V"]