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script.js
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script.js
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"use strict";
// canvas properties
var width = 700;
var height = 500;
// create svg canvas to draw map on
var svg = d3.select("div.container").append("svg")
.attr("class", "canvas")
.attr("width", width)
.attr("height", height);
// create group object g
var g = svg.append("g");
// define projection parameters
var projection = d3.geo.mercator()
.center([16.385, 48.215])
.scale(600000)
.rotate([0,0]);
// create path object
var path = d3.geo.path().projection(projection);
// create div object to use for dynamic tooltip
var div = d3.select("div.container")
.append("div")
.attr("class", "tooltip")
.style("opacity", 0);
//draw map
var buildings = d3.json("./data/buildings.geojson", function (error, data){
g.append("g")
.attr("class", "buildings")
.selectAll ("path")
.data(data.features)
.enter().append("path")
.attr ("d", path)
var green = d3.json("./data/green_areas.geojson", function (error, data){
g.append("g")
.attr("class", "green")
.selectAll("path")
.data(data.features)
.enter().append("path")
.attr("d", path)
var water = d3.json("./data/water_areas.geojson", function (error, data){
g.append("g")
.attr("class", "water")
.selectAll("path")
.data(data.features)
.enter().append("path")
.attr("d", path)
// call walk function to include walk here
drawwalk();
});
});
});
function drawwalk(){
var walk = d3.json("data/walk.geojson", function (error, data){
g.append("g")
.attr("class", "walk")
.selectAll("path")
.data(data.features)
.enter()
.append("path")
.attr("d", path)
var pois = d3.json("data/POI.geojson", function (error, data){
g.append("g")
.attr("class", "pois")
.selectAll("path")
.data(data.features)
.enter()
.append("path")
.attr("class", "poi")
.attr("d", path)
.on("click", clicked)
// tooltip is defined here:
.on("mouseover", function(d) {
div.transition()
.duration(200)
.style("opacity", .9);
div.html(d.properties.title)
.style("left", (d3.event.pageX + 28) + "px")
.style("top", (d3.event.pageY - 28) + "px");
//d3.select(this).attr("stroke-width", "").style("stroke-width", 8 "px");
// no idea why this isn't working (i would like to enlarge the poi)
})
.on("mouseout", function(d) {
div.transition()
.duration(100)
.style("opacity", 0);
});
g.append("g")
.attr("class", "label")
.selectAll("text")
.data(data.features)
.enter()
.append("text")
.attr("transform", function(d) { return "translate(" + projection(d.geometry.coordinates) + ")"; })
.attr("dy", ".35em")
.text(function(d) { return d.properties.name; })
.style("pointer-events", "none")
.append("title")
.text(function(d) { return d.properties.title; })
.style("pointer-events", "none");
});
});
}
// click on poi
function clicked(d) {
div.transition()
.duration(100)
.style("opacity", 0);
var x, y, k, centered;
if (d && centered !== d) {
var centroid = path.centroid(d);
x = centroid[0];
y = centroid[1];
k = 4;
centered = d;
} else {
x = width / 2;
y = height / 2;
k = 1;
centered = null;
}
g.selectAll("path")
.classed("active", centered && function(d) {
return d === centered;
});
g.transition()
.duration(750)
.attr("transform","translate(" + width / 2 + "," + height / 2 + ")scale(" + k + ")translate(" + -x + "," + -y + ")")
.style("stroke-width", 1.5 / k + "px");
// write the desciption in the text container
var description = d3.select("div.description").selectAll("p")
.text(d.properties.name + ": " + d.properties.title);
}
// zoom functionality parameters
var zoom = d3.behavior.zoom()
.translate([0, 0])
.scale(1)
.scaleExtent([1, 8])
.on("zoom", zoomed);
svg.call(zoom)
// Zooooooom
function zoomed() {
g.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
// we could adapt the style depending on zoom level, if we would like to...
// g.select(".buildings").style("stroke-width", 1.5 / d3.event.scale + "px");
// g.select(".walk").style("stroke-width", .5 / d3.event.scale + "px");
}