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index_v1.html
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index_v1.html
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<!DOCTYPE html>
<meta charset="utf-8">
<style>
.vector {
fill-opacity: 0;
fill-color: gray;
stroke: black;
}
.tooltip {
color: black;
font-family: sans-serif;
font-size: 80%;
background-color: white;
padding: .5em;
text-shadow: #f5f5f5 0 1px 0;
border-radius: 2px;
opacity: 0.8;
position: absolute;
border-style: solid;
border-width: 0.5px;
}
.ttname {
font-weight: bold;
display: block;
}
.ttinc {
font-weight: normal;
display: block;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script src="//d3js.org/d3.geo.tile.v0.min.js"></script>
<script>
var width = 960,
height = 500;
// pre-projected topojson, no projection
var path = d3.geo.path()
.projection(null);
// contains the tile number for a coordinate
var tileM3d = d3.geo.tile()
.size([width, height]);
var initialScale = 256;
// zoom values for raster tiles of 256px
var zoomListener = d3.behavior.zoom()
.scale(initialScale)
.scaleExtent([256, 4096])
.on("zoom", zoomHandler);
var body = d3.select("body");
var tooltip = body.append("div")
.attr("class", "tooltip")
.attr("id", "tooltip");
var svg = body.append("svg")
.attr("width", width)
.attr("height", height)
.call(zoomListener)
.on("mousemove", mmHandler)
.on("mouseout", mmHandler);
var vectorLayer = svg.append("g")
.attr("class", "vector");
var rasterLayer = svg.append("g")
.attr("class", "raster");
// call once to load raster images
zoomHandler();
d3.json("https://raw.githubusercontent.com/stefanborchardt/SFTrees/master/data/sfshtr.json", function(error, sfshtr) {
if (error) throw error;
var sftracts = topojson.feature(sfshtr, sfshtr.objects.__sftracts);
vectorLayer.append("g")
// transform on group to align vector with raster layer
.attr("transform", "rotate(" + -1.2 + ")scale(" + .953 + ")translate(" + [-111, -40] + ")")
.attr("id", "alignGroup")
.selectAll("path")
.data(sftracts.features)
.enter()
.append("path")
.attr("d", path)
.attr("data-tooltip-name", function(d) {
return d.properties.NAME;
})
.attr("data-tooltip-inc-est", function(d) {
return d.properties.INC_EST;
})
.attr("id", function(d) {
return "_" + d.id;
})
.style("fill-opacity", function(d) {
return +d.properties.INC_EST/200000;
});
});
var idDisplayed = null;
function mmHandler() {
// vector layer is under raster layer, so find the path element and put data in tooltip
var pos = d3.mouse(svg.node());
var posrect = svg.node().createSVGRect();
posrect.x = pos[0];
posrect.y = pos[1];
posrect.width = posrect.height = 1;
var elems = svg.node().getIntersectionList(posrect, null);
if (elems.length == 0 || elems[0].nodeName !== "path") {
tooltip.style("visibility", "hidden");
return;
}
var pathElem = elems[0];
if (idDisplayed == pathElem.id) {
return;
}
idDisplayed = pathElem.id;
// glow
var op = pathElem.style.fillOpacity;
d3.select(pathElem)
.transition()
.styleTween("fill", function() { return d3.interpolate("gray", "orange");
})
.transition()
.styleTween("fill", function() { return d3.interpolate("orange", "gray");
})
.style("fill", null);
var name = pathElem.attributes["data-tooltip-name"].value;
var inc_est = pathElem.attributes["data-tooltip-inc-est"].value;
tooltip
.style({"visibility": "visible", "top": pos[1]-20+"px", "left": pos[0]+10+"px"})
.selectAll("span")
.remove();
tooltip
.append("span").classed("ttname", true)
.text(name)
.append("span").classed("ttinc", true)
.text("Median Household Income: $ " + (+inc_est).toLocaleString());
}
function zoomHandler() {
var translate = zoomListener.translate(),
scale = zoomListener.scale();
vectorLayer
// transform for zoom on vector layer, the alignment stays the same; adjust scaling
.attr("transform", "translate(" + translate + ")scale(" + scale/initialScale + ")")
.style("stroke-width", initialScale/scale);
// get the tile numbers to display
var tiles = tileM3d
.scale(scale)
.translate(translate)
();
var images = rasterLayer
.attr("transform", "scale(" + tiles.scale + ")translate(" + tiles.translate + ")")
.selectAll("image")
.data(tiles, function(d) { return d; });
images.exit()
.remove();
images.enter()
.append("image")
// calculate my tile number from the d3 tile number
.attr("xlink:href", function(d) {
var baseUrl = "https://storage.googleapis.com/sfutc_t_tls/";
var x = d[0];
var y = d[1];
if (x < 0 || y < 0) {
return baserUrl + "white.png";
}
var f = Math.pow(2, d[2]);
if (f == 1 && (x > 3 || y > 3)
|| f == 2 && (x > 7 || y > 6)
|| f == 4 && (x > 14 || y > 12 || y == 0)
|| f == 8 && (x > 29 || y > 24)
|| f == 16 && (x > 57 || y > 49) ) {
return baseUrl + "white.png";
}
var z = d[2] + 13;
return baseUrl + z + "/" + (x+1308*f) + "/" + (y+3165*f) + ".png";
})
.attr("width", 1)
.attr("height", 1)
.attr("x", function(d) { return d[0]; })
.attr("y", function(d) { return d[1]; });
}
d3.select(self.frameElement).style("height", height + "px");
</script>
</body>
</html>