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d3.json
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| const w = 525; | |
| const h = 400; | |
| const svg = d3.select("body").append("svg").attr("width", w).attr("height", h); | |
| const xScale = d3.scaleLinear().domain([0,1]).range([0,w-60]); | |
| const yScale = d3.scaleLinear().domain([0,1]).range([h,0]); | |
| const colors = d3.scaleOrdinal(d3.schemeTableau10); | |
| d3.json("https://data.ct.gov/resource/y6p2-px98.json?category=Fruit").then(function (data) { | |
| console.log(data); | |
| xScale.domain([d3.min(data.map(d => d.location_1.coordinates[0])), | |
| d3.max(data.map(d => d.location_1.coordinates[0]))]); | |
| yScale.domain([d3.min(data.map(d => d.location_1.coordinates[1])), | |
| d3.max(data.map(d => d.location_1.coordinates[1]))]); | |
| svg.selectAll("circle") | |
| .data(data) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", d => xScale(d.location_1.coordinates[0])) | |
| .attr("cy", d => yScale(d.location_1.coordinates[1])) | |
| .attr("r", "3") | |
| .attr("fill", d => colors(d.item)) | |
| .on("mouseover", function(d) { // IDVW2, p. 270 | |
| var xPos = +d3.select(this).attr("cx"); | |
| var yPos = +d3.select(this).attr("cy"); | |
| d3.select(this).style("cursor", "pointer"); | |
| svg.append("text") | |
| .attr("id", "tooltip") | |
| .attr("x", function() { | |
| if(xPos < w/2) { | |
| return xPos + 10 | |
| } else { | |
| return xPos - 10 | |
| } | |
| }) | |
| .attr("y", yPos) | |
| .attr("font-size", "11px") | |
| .attr("text-anchor", function() { | |
| if(xPos < w/2) { | |
| return "start" | |
| } else { | |
| return "end" | |
| } | |
| }) | |
| .attr("alignment-baseline", "middle") | |
| .text(d.item); // not a function (already in one) | |
| }) | |
| .on("mouseout", function() { | |
| d3.select("#tooltip").remove(); | |
| }); | |
| }); | |
| </script> | |
| </body> |
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