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app.js
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app.js
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#!/usr/bin/env node
'use strict';
/*
* Requires
*/
var geojsonExtent = require('geojson-extent'),
jsdom = require('jsdom'),
fs = require('fs'),
__ = require('underscore'),
path = require('path'),
readMultipleFiles = require('read-multiple-files');
/*
* Configs
*/
var config = {
"name": "eu",
"flag": {
"size": [1600, 1066] // "size": [3200, 1600]
}
};
// test if geojson file exists
fs.open('data/' + config.name + '.geojson', 'r', function(err, fd) {
if (err) {
console.log("Error opening geojson file !");
} else {
/*
* Generate colour json file from geojson
*/
if (process.argv.slice(2) == '-colours') {
generateColours();
} else {
// check for colours file exists
fs.open('data/' + config.name + '.colours.json', 'r', function(err, fd) {
if (err) {
console.log("Error opening colours file! This file can be generated by issuing:");
console.log("node app.js -colours");
} else {
// read in the geojson and flag colour files
readMultipleFiles(['data/' + config.name + '.geojson', 'data/' + config.name + '.colours.json'], 'utf8', function(err, files) {
if (err) {
throw err;
}
console.log('Opening files...');
var areaData = [];
var geojson = JSON.parse(files[0]);
var flags = JSON.parse(files[1]);
for (var i = 0; i < geojson.features.length; i++) {
var flag = __.find(flags.flags, {
name: geojson.features[i].properties.name
});
var area = {
"name": geojson.features[i].properties.name,
"lng": geojsonExtent(geojson.features[i])[0], // get the most westerly point
"colours": flag.colours
};
areaData.push(area);
}
areaData.sort(function(a, b) {
return parseFloat(a.lng) - parseFloat(b.lng)
});
// draw flag
drawFlag(areaData);
});
}
});
}
}
});
/*
* Functions
*/
function drawFlag(areas) {
console.log("Generating svg image");
jsdom.env(
"<html><body></body></html>", // create DOM
['http://d3js.org/d3.v3.min.js', // JS dependencies
'js/d3.v3.min.js'
],
function(err, window) {
// generate svg
var svg = window.d3.select("body")
.append("svg")
.attr("width", config.flag.size[0])
.attr("height", config.flag.size[1]);
var childFlagWidth = config.flag.size[0] / areas.length;
//draw loop
for (var c = 0; c < areas.length; c++) {
var childFlagOffset = childFlagWidth * c;
for (var f = 0; f < areas[c].colours.length; f++) {
var childFlagSectionOffset = (childFlagWidth / areas[c].colours.length) * f;
// generate flag sections
svg.append("rect")
.attr("id", areas[c].name.replace('', '-') + "-" + f)
.attr("x", childFlagSectionOffset + childFlagOffset) //offset
.attr("y", 0)
.attr("width", childFlagWidth / areas[c].colours.length)
.attr("height", config.flag.size[1])
.style("fill", areas[c].colours[f]);
}
}
// save file
fs.writeFile('output/' + config.name + '.svg', window.d3.select("body").html(), function(err) {
if (err) {
console.log(err);
} else {
console.log('Done...');
console.log('...created output/' + config.name + '.svg');
}
});
});
}
function generateColours() {
console.log("Generating colours file");
var outFile = 'data/' + config.name + '.colours.json';
fs.readFile('data/' + config.name + '.geojson', 'utf8', function(err, data) {
if (err) throw err;
var geojson = JSON.parse(data);
var colours = {
"flags": []
};
for (var f = 0; f < geojson.features.length; f++) {
var flag = {
"name": geojson.features[f].properties.name,
"colours": []
}
colours.flags.push(flag);
}
fs.writeFile(outFile, JSON.stringify(colours, null, 3), function(err) {
if (err) {
console.log(err);
} else {
console.log("Colours skeleton saved to " + outFile);
}
});
});
}