Practice with map locations and labels.
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December 3, 2015 20:55
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Map labels
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<!DOCTYPE html> | |
<head> | |
<title>Louisiana drop shadow</title> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
padding: 0; | |
margin: 0; | |
} | |
svg { | |
background-color: #E8C691; | |
} | |
.bold { | |
font-weight: bold; | |
} | |
.parishes { | |
fill: #FAFAFA; | |
stroke: #777; | |
stroke-opacity: 0.5; | |
stroke-width: 0.5px; | |
opacity: 0.8; | |
} | |
.parish-border { | |
fill: none; | |
stroke: #DFDFDF; | |
} | |
.state-border { | |
fill: none; | |
stroke: #585858; | |
} | |
.city-label { | |
font-weight: 500; | |
text-transform: uppercase; | |
text-anchor: middle; | |
opacity: 0.4; | |
color: #000; | |
font-family: arial, helvetica, sans-serif; | |
font-size: 13px; | |
} | |
.map-note-text { | |
font-size: 15px; | |
font-weight: 500; | |
color: #000; | |
font-family: arial, helvetica, sans-serif; | |
line-height: 18px; | |
margin: 0; | |
} | |
.state-label { | |
font-weight: 500; | |
text-transform: uppercase; | |
text-anchor: middle; | |
opacity: 0.3; | |
color: #000; | |
font-family: arial, helvetica, sans-serif; | |
font-size: 24px; | |
line-height: 28px; | |
letter-spacing: 0.333em; | |
} | |
</style> | |
</head> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script src="//d3js.org/topojson.v1.min.js"></script> | |
<script> | |
var width = 960, | |
height = 650; | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
// Inset map | |
var map_projection = d3.geo.albers() | |
.translate([width / 2, height / 2]) | |
.rotate([91.6, 0]) // Rotate CCW (looking down onto North Pole) | |
.center([0, 31.2]) | |
.parallels([29, 33]) | |
.scale(8000); | |
var map_path = d3.geo.path() | |
.projection(map_projection); | |
d3.json("parishes.json", function(error, data) { | |
if (error) throw error; | |
// Draw land | |
svg.append("g") | |
.attr("class", "parishes") | |
.selectAll("path") | |
.data(topojson.feature(data, data.objects.parishes).features) | |
.enter().append("path") | |
.attr("fill", function(d) { | |
var parish_code_as_int = parseInt(d.properties.parishcode, 10); | |
if (parish_code_as_int < 30) { | |
return "#C00"; | |
} else if (parish_code_as_int >= 30 && parish_code_as_int < 60) { | |
return "#FDBF4F"; | |
} else { | |
return "#FFF"; | |
} | |
}) | |
.attr("d", map_path); | |
// Draw parish borders | |
svg.append("path") | |
.datum(topojson.mesh(data, data.objects.parishes, function(a, b) { return a !== b; })) | |
.attr("class", "parish-border") | |
.attr("d", map_path); | |
// Draw state border | |
svg.append("path") | |
.datum(topojson.mesh(data, data.objects.parishes, function(a, b) { return a === b; })) | |
.attr("class", "state-border") | |
.attr("d", map_path); | |
// Draw circle marker | |
svg.selectAll('.circle-icon') | |
.data(topojson.feature(data, data.objects.parishes).features) | |
.enter().append('circle') | |
.each(function(d) { | |
if (d.properties.parishname !== 'Caddo' && d.properties.parishname !== 'Lafayette') { | |
return; | |
} | |
d3.select(this) | |
.attr("r", 4) | |
.attr("transform", function(d) { return "translate(" + map_path.centroid(d) + ")"; }) | |
.attr("fill", "none") | |
.attr("stroke", "black") | |
.attr("stroke-width", 2); | |
}) | |
.filter(function(d) { | |
return d.properties.parishname !== 'Caddo' && d.properties.parishname !== 'Lafayette'; | |
}).remove(); // Delete empty circle elements | |
// Draw parish name | |
svg.selectAll('.parish-label') | |
.data(topojson.feature(data, data.objects.parishes).features) | |
.enter().append('text') | |
.each(function(d) { | |
if (d.properties.parishname !== 'Orleans') { | |
return; | |
} | |
d3.select(this) | |
.attr("transform", function(d) { return "translate(" + map_path.centroid(d) + ")"; }) | |
// .attr("dx", "-3em") | |
// .attr("dy", "-0.5em") | |
.attr("fill", "black") | |
.style("text-anchor", "end") | |
.text(function(d) { return d.properties.parishname }); | |
}) | |
.filter(function(d) { | |
return d.properties.parishname !== 'Orleans'; | |
}).remove(); | |
// Draw parish text note | |
svg.selectAll('.parish-note') | |
.data(topojson.feature(data, data.objects.parishes).features) | |
.enter().append('text') | |
.each(function(d) { | |
if (d.properties.parishname === 'Lafayette') { | |
d3.select(this) | |
.attr("transform", function(d) { return "translate(" + map_path.centroid(d) + ")"; }) | |
.attr("dx", "-150") | |
.attr("dy", "150") | |
.attr("fill", "black") | |
.style("text-anchor", "end") | |
.text("Welcome to Lafayette."); | |
} else if (d.properties.parishname === 'Caddo') { | |
d3.select(this) | |
.attr("transform", function(d) { return "translate(" + map_path.centroid(d) + ")"; }) | |
.attr("dx", "10") | |
.attr("dy", "-90") | |
.attr("fill", "black") | |
.attr("id", "caddo-text") | |
.style("text-anchor", "start") | |
.text("This is the "); | |
d3.select(this) | |
.append("tspan") | |
.attr("class", "bold") | |
.text("centroid "); | |
d3.select(this) | |
.append("tspan") | |
.attr("x", "10") | |
.attr("y", "-75") | |
.style("text-anchor", "start") | |
.text("of Caddo Parish."); | |
} else { | |
return; | |
} | |
}) | |
.filter(function(d) { | |
return d.properties.parishname !== 'Caddo' && d.properties.parishname !== 'Lafayette'; | |
}).remove(); | |
// Draw line between parish marker and text | |
// Line path generator | |
var line = d3.svg.line() | |
.x(function(d) { return d.x; }) | |
.y(function(d) { return d.y; }) | |
.interpolate("basis"); | |
svg.selectAll(".parish-line") | |
.data(topojson.feature(data, data.objects.parishes).features) | |
.enter().append('path') | |
.attr("class", "parish-line") | |
.attr("d", function(d) { | |
var centroid = map_path.centroid(d); | |
if (d.properties.parishname === 'Lafayette') { | |
var lineData = [ | |
{"x": centroid[0] - 4, "y": centroid[1] + 4}, | |
{"x": centroid[0] - 145, "y": centroid[1] + 145} | |
]; | |
} else if (d.properties.parishname === 'Caddo') { | |
var lineData = [ | |
{"x": centroid[0], "y": centroid[1] - 4}, | |
{"x": centroid[0] + 10, "y": centroid[1] - 72} | |
]; | |
} else { | |
return; | |
} | |
return line(lineData); | |
}) | |
.attr("stroke", "black") | |
.attr("stroke-width", 1) | |
.attr("opacity", 0.8) | |
.attr("fill", "#000") | |
.filter(function(d) { | |
return d.properties.parishname !== 'Caddo' && d.properties.parishname !== 'Lafayette'; | |
}).remove(); | |
// State label | |
svg.append("text") | |
.attr("class", "state-label") | |
.attr("x", width * 0.35) | |
.attr("y", height * 0.4) | |
.text('Louisiana'); | |
}); | |
// Allows iframe on bl.ocks.org. | |
d3.select(self.frameElement).style("height", height + "px"); | |
</script> | |
</body> | |
</html> |
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