chart = {
const width = 960,
height = 900;
const svg = d3.create("svg")
.attr("viewBox", [50, 50, width-100, height-100]);
var projection = d3
.geoAlbersUsa()
.fitSize([width - 50, height - 50], gbox);
var path1 = d3.geoPath().projection(projection);
var path2 = d3.geoPath().projection(projection);
var path3 = d3.geoPath().projection(projection);
var path4 = d3.geoPath().projection(projection);
var path5 = d3.geoPath().projection(projection);
var path6 = d3.geoPath().projection(projection);
var g = svg.append("g").attr("id", "paths");
var clicks =[]
g.selectAll("path2") //d3 geopath
.data(streets.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("path") //appends path to data
.attr('class','outlines')
.attr("d", path2) //The d attribute defines a path to be drawn, only applies to appended elements
.style("fill", "none")
.style('stroke-opacity','1')
.style("stroke-width", '.75')
.style("stroke", "rgb(0,0,0)")
g.selectAll("path3") //d3 geopath
.data(gbldgs.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("path") //appends path to data
.attr('class','outlines')
.attr("d", path3) //The d attribute defines a path to be drawn, only applies to appended elements
.style("fill", "rgb(240,240,240)")
.style("fill-opacity", ".5")
.style('stroke-opacity','.4')
.style("stroke-width", '.5')
.style("stroke", "rgb(0,0,0)")
var c = svg.selectAll("circle") //circle
.data(spots)
.enter() //there are more data than elements, this selects them
.append("circle") //appends path to data
.attr("cx", function(d) {return projection([d.long,d.lat])[0]})
.attr("cy", function(d) {return projection([d.long,d.lat])[1]})
.attr('r',3)
.attr('fill','black')//add function to control color by 'type'
.style('fill-opacity','1')
.style('stroke','black')
.style('stroke-width','1')
.on('mouseover',spotText)
.on('mouseout',removeText)
function spotText(i,d){
//this is where we write what we want to happen when we mouseover the spot
//d.name is the name of what I'm mousing over
svg.append("text")
.attr('class','spotInfo')
.attr('x','460')
.attr('y','350')
.attr('font-family','Helvetica')
.attr('font-size','.6em')
.attr('font-weight','bold')
.attr('text-anchor','start')
.text(d.name)
svg.append("text")
.attr('class','spotInfo')
.attr('x','460')
.attr('y','360')
.attr('font-family','Helvetica')
.attr('font-size','.6em')
.attr('font-weight','300')
.attr('text-anchor','start')
.text(d.description)
}
function removeText(i,d){
d3.selectAll('text.spotInfo').remove()//to remove a class of objects, state the object type, then class name
}
var t = svg.selectAll('text')
.data(transportation)
.enter()
.append('text')
.attr('x','200')
.attr('y',function(d,i){return 200+(i*20)})
.attr('font-family','Helvetica')
.attr('font-size','.6em')
.attr('text-anchor','start')
.attr('font-weight','bold')
.text(function(d) {return d})
/*
c.enter.append('circle')//format to add additional circles
.data(trees)
.enter() //there are more data than elements, this selects them
.append("circle") //appends path to data
.attr("cx", function(d) {return projection([d.long,d.lat])[0]})
.attr("cy", function(d) {return projection([d.long,d.lat])[1]})
.attr('r',3)
.attr('fill','black')
.style('fill-opacity','1')
*/
return svg.node();
}