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mn-PopDensity.js
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mn-PopDensity.js
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//Define Margin
var margin = {left: 0, right: 0, top: 0, bottom: 20},
width = 960 - margin.left - margin.right,
height = 980 - margin.top - margin.bottom;
//Define SVG
var svg = d3.select("#visualization")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var ca_color = d3.scaleThreshold().domain([1, 10, 50, 200, 500, 1000, 2000, 4000]).range(d3.schemeOrRd[9]);
var mn_color = d3.scaleThreshold().domain([1, 5, 40, 160, 400, 800, 2000, 6000]).range(d3.schemeGnBu[9]);
var path = d3.geoPath();
function draw_color_legend(color, upper_bound, name) {
var x = d3.scaleSqrt()
.domain([0, upper_bound])
.rangeRound([550, 950]);
var g = svg.append("g")
.attr("class", "legend legend-" + name)
.attr("transform", "translate(0,40)");
g.selectAll("rect")
.data(color.range().map(function(d) {
d = color.invertExtent(d);
if (d[0] == null) d[0] = x.domain()[0];
if (d[1] == null) d[1] = x.domain()[1];
return d;
}))
.enter().append("rect")
.attr("height", 8)
.attr("x", function(d) { return x(d[0]); })
.attr("width", function(d) { return x(d[1]) - x(d[0]); })
.attr("fill", function(d) { return color(d[0]); });
g.append("text")
.attr("class", "caption")
.attr("x", x.range()[0])
.attr("y", -6)
.attr("fill", "#000")
.attr("text-anchor", "start")
.attr("font-weight", "bold")
.text("Population per square mile");
g.call(d3.axisBottom(x)
.tickSize(13)
.tickValues(color.domain()))
.select(".domain")
.remove();
g.style('opacity', 0);
return g;
}
var ca_legend = draw_color_legend(ca_color, 4500, 'ca');
var mn_legend = draw_color_legend(mn_color, 6500, 'mn');
function fill_tract_color(color_scale) {
svg.selectAll("g.tracts path")
.style("fill", function(d) { return color_scale(d.properties.density) });
}
ca_legend.style('opacity', 1);
var cur_legend = 'ca';
function change_legend_color() {
if (cur_legend === 'ca') {
cur_legend = 'mn';
fill_tract_color(mn_color);
ca_legend.style('opacity', 0);
mn_legend.style('opacity', 1);
} else {
cur_legend = 'ca';
fill_tract_color(ca_color);
ca_legend.style('opacity', 1);
mn_legend.style('opacity', 0);
}
}
var g_buttons = svg.append("g")
.attr("class", "buttons-g")
.attr("transform", "translate(550, 70)");
function create_butoon(name, text, width, tx, ty, callback) {
var btn = g_buttons.append("g")
.attr("class", "button button-" + name)
.attr("transform", "translate(" + tx + "," + ty + ")");
btn.append("rect")
.attr("height", 28)
.attr("width", width)
.attr('rx', 5)
.attr('ry', 5)
.attr("fill", '#f2f2f2')
.attr("stroke", '#000');
btn.append("text")
.style("text-anchor", "middle")
.attr("x", width / 2)
.attr("y", 20)
.attr("font-size", "16px")
.text(text);
btn.on("click", callback);
btn.on("mouseover", function () {
btn.select("rect")
.attr("fill", "#cfcfcf")
});
btn.on("mouseout", function () {
btn.select("rect")
.attr("fill", "#f2f2f2")
});
}
var state_b_on = false;
var tract_b_on = false;
create_butoon('change_color', 'Change Legend Color', 180, 0, 0, change_legend_color);
create_butoon('change_color', 'Toggle State Boundary', 180, 0, 34, function () {
if (state_b_on) {
svg.select("g.state-border")
.attr("class", "state-border boundary-off")
} else {
svg.select("g.state-border")
.attr("class", "state-border boundary-on")
}
state_b_on = !state_b_on;
});
create_butoon('change_color', 'Toggle Census Tract Boundary', 220, 188, 34, function () {
if (tract_b_on) {
svg.select("g.tracts")
.attr("class", "tracts boundary-off")
} else {
svg.select("g.tracts")
.attr("class", "tracts boundary-on")
}
tract_b_on = !tract_b_on;
});
d3.json('mn-topo.json', function (error, mn) {
if (error) return console.error(error);
// draw tracts
svg.append("g")
.attr("class", "tracts boundary-off")
.selectAll("path")
.data(topojson.feature(mn, mn.objects.tracts).features)
.enter().append("path")
.attr("d", path);
fill_tract_color(ca_color);
// draw county boundary
svg.append("g")
.attr("class", "counties boundary-on")
.selectAll("path")
.data(topojson.feature(mn, mn.objects.counties).features)
.enter().append("path")
.attr("d", path)
.attr("fill", "none");
// draw state boundary
svg.append("g")
.attr("class", "state-border boundary-off")
.selectAll("path")
.data(topojson.feature(mn, mn.objects.state_border).features)
.enter().append("path")
.attr("d", path)
.attr("fill", "none");
});