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forked from maelafifi's block: fresh block
Created
April 15, 2017 22:25
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fresh block
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <link href="style.css" rel="stylesheet" type="text/css"> | |
| <title>SF Arrests</title> | |
| </head> | |
| <body> | |
| <svg width="960" height="600"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="script.js"></script> | |
| </body> |
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| // the geojson files are large, so loading them locally | |
| var urls = { | |
| basemap: "https://usf-cs360-2017.github.io/homework3-maelafifi/SVDistricts.geojson" | |
| }; | |
| var svg = d3.select("body").select("svg"); | |
| var g = { | |
| basemap: svg.append("g").attr("id", "basemap"), | |
| tooltip: svg.append("g").attr("id", "tooltip") | |
| }; | |
| // https://github.com/d3/d3-geo#conic-projections | |
| var projection = d3.geoConicEqualArea(); | |
| var path = d3.geoPath().projection(projection); | |
| // http://mynasadata.larc.nasa.gov/latitudelongitude-finder/ | |
| // center on san francisco [longitude, latitude] | |
| // choose parallels on either side of center | |
| projection.parallels([37.692514, 37.840699]); | |
| // rotate to view we usually see of sf | |
| projection.rotate([122, 0]); | |
| // we want both basemap and streets to load before arrests | |
| // https://github.com/d3/d3-queue | |
| var q = d3.queue() | |
| .defer(d3.json, urls.basemap) | |
| .await(drawMap); | |
| function drawMap(error, basemap) { | |
| if (error) throw error; | |
| console.log("basemap", basemap); | |
| // make sure basemap fits in projection | |
| projection.fitSize([960, 600], basemap); | |
| // draw basemap | |
| var land = g.basemap.selectAll("path.land") | |
| .data(basemap.features) | |
| .enter() | |
| .append("path") | |
| .attr("d", path) | |
| .attr("class", "land"); | |
| g.basemap.selectAll("path.neighborhood") | |
| .data(basemap.features) | |
| .enter() | |
| .append("path") | |
| .attr("d", path) | |
| .attr("class", "neighborhood") | |
| .each(function(d) { | |
| // save selection in data for interactivity | |
| d.properties.outline = this; | |
| }); | |
| var tip = g.tooltip.append("text").attr("id", "tooltip"); | |
| tip.attr("text-anchor", "end"); | |
| tip.attr("dx", -5); | |
| tip.attr("dy", -5); | |
| tip.style("visibility", "hidden"); | |
| // add interactivity | |
| land.on("mouseover", function(d) { | |
| tip.text("District " + d.properties.numbertext.toLowerCase()); | |
| tip.style("visibility", "visible"); | |
| d3.select(d.properties.outline).raise(); | |
| d3.select(d.properties.outline).classed("active", true); | |
| }) | |
| .on("mousemove", function(d) { | |
| var coords = d3.mouse(g.basemap.node()); | |
| tip.attr("x", coords[0]); | |
| tip.attr("y", coords[1]); | |
| }) | |
| .on("mouseout", function(d) { | |
| tip.style("visibility", "hidden"); | |
| d3.select(d.properties.outline).classed("active", false); | |
| }); | |
| } | |
| function translate(x, y) { | |
| return "translate(" + String(x) + "," + String(y) + ")"; | |
| } |
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| body { | |
| background-color: white; | |
| text-align: center; | |
| font-family: sans-serif; | |
| font-size: 9pt; | |
| } | |
| #tooltip { | |
| font-weight: 600; | |
| text-shadow: 0px 0px 2px white; | |
| fill: black; | |
| stroke: none; | |
| } | |
| path.land { | |
| fill: #dddddd; | |
| stroke: none; | |
| } | |
| path.neighborhood { | |
| fill: none; | |
| stroke: white; | |
| stroke-width: 3.5px; | |
| pointer-events: none; | |
| } | |
| path.street { | |
| fill: none; | |
| stroke: white; | |
| stroke-width: 1px; | |
| pointer-events: none; | |
| } | |
| .active { | |
| stroke: red !important; | |
| stroke-width: 1.5px !important; | |
| } | |
| circle.symbol { | |
| fill-opacity: 0.6; | |
| stroke: white; | |
| stroke-width: 1px; | |
| } |
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