So if you have a bunch of polygons and they’re topojson and you want to show em using d3 there’s a handy dandy neighbors method which when combined with a color scale generator makes coloring polygons a breeze.
You still need to be careful though, I’m using 8 or maybe 9 colors, I still haven’t really figured out how it’s working. But at least I got it to work. Now read the docs and see if I can wrap my head around the colors and scales stuff.
<!DOCTYPE html>
<meta charset="utf-8">
<style>
/* CSS goes here. */
.casubun {
// fill: #003831;
}
.bords{
fill:none;
stroke-width:2px;
stroke:white;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
/* JavaScript goes here. */
//choose dimensions of my svg thing
var width = 960,
height = 600;
var color = d3.scale.category10();
color.range(color.range().slice(0,8));
//Choosing mercator because that's what I made the data in and also scale and center setting
var projection = d3.geo.mercator()
.scale(2000)
.translate([width / 2, height / 2])
.center([-120,36])
;
// So now when I call path on jam it will use this projection and stuff
var path = d3.geo.path()
.projection(projection);
// Appending the actual SVG to the body of the page w/ height width
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("/mpmckenna8/raw/60910c22b47777967704/calAss1.json", function(cali) {
var neighbors = topojson.neighbors(cali.objects.assemD2011.geometries);
var districts = topojson.feature(cali, cali.objects.assemD2011).features;
svg.selectAll(".casubun")
.data(districts)
.enter().append("path")
.attr("class", function(d) { return "casubun"; })
.attr("d", path)
.style("fill",function(d,i){
return color(d.color=d3.max(neighbors[i],function(n){
return districts[n].color;
})
+ 1 | 0
);
})
;
svg.append("path")
.datum(topojson.mesh(cali,cali.objects.assemD2011, function(a,b){
return a;
}))
.attr("d",path)
.attr("class", "bords");
});
d3.select("body")
.transition()
.style("background-color", "black");
</script>
</body>