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December 14, 2015 11:48
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Simple Perl script used to encode processed tweets for visualizing on Google Map.
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| use strict; | |
| use JSON; | |
| use Data::Dumper; | |
| open(TWEET_STAT, "<$ARGV[0]"); | |
| my $rows = []; | |
| while (<TWEET_STAT>) { | |
| if ($_ =~ /(.*?)\x01(.*?)\x01(\d*)/) { | |
| my $lat = $1 + 0; | |
| my $lng = $2 + 0; | |
| my $tweet_count = $3 + 0; | |
| last if ($tweet_count <= 50); | |
| push @{$rows}, {"coordinates" => [$lng, $lat], "tweet_count" => $tweet_count} | |
| } | |
| } | |
| my $results = {"rows" => $rows}; | |
| my $json = encode_json $results; | |
| $json = "eqfeed_callback($json);"; | |
| print $json; | |
| close(TWEET_STAT); | |
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false&libraries=visualization"></script> | |
| <style> | |
| .container { height: 400pt; padding: 0 20pt 0 20pt; } | |
| #map_canvas { height: 85%; } | |
| </style> | |
| <script type="text/javascript"> | |
| function init() { | |
| var mapOptions = { | |
| zoom: 2, | |
| center: new google.maps.LatLng(2.8, -187.3), | |
| mapTypeId: google.maps.MapTypeId.TERRAIN | |
| }; | |
| var map = new google.maps.Map(document.getElementById('map_canvas'), | |
| mapOptions); | |
| var script = document.createElement('script'); | |
| script.src = 'tweets_heatdata'; | |
| var s = document.getElementsByTagName('script')[0]; | |
| s.parentNode.insertBefore(script, s); | |
| window.eqfeed_callback = function(results) { | |
| var heatmapData = []; | |
| for (var i = 0; i < results.rows.length; i++) { | |
| var coords = results.rows[i].coordinates; | |
| var latLng = new google.maps.LatLng(coords[1], coords[0]); | |
| var count = results.rows[i].tweet_count; | |
| var weightedLoc = { | |
| location: latLng, | |
| weight: count | |
| }; | |
| heatmapData.push(weightedLoc); | |
| } | |
| var heatmap = new google.maps.visualization.HeatmapLayer({ | |
| data: heatmapData, | |
| dissipating: false, | |
| map: map | |
| }); | |
| } | |
| } | |
| google.maps.event.addDomListener(window, "load", init); | |
| </script> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <div id="map_canvas"></div> | |
| </div> | |
| </body> | |
| </html> | |
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