GeoJson World Countries SVG Overlay Colour Infill Tutorial

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GeoJson World Countries SVG Overlay Colour Infill Tutorial

GeoJson World Countries SVG Overlay Colour Infill Tutorial

The “overlay” situation as of yesterday’s GeoJson World Countries Geo Chart Tutorial was …

  • document.body lowest level …
  • overlayed by HTML canvas element plotted with world country linework …
  • overlayed by HTML img (transparent image) element and its associated image map area elements … and today we add into the mix …
  • HTML div hosting SVG elements overlaying (only when called upon) individual GeoJson entities overlay

What can this achieve? The GeoJson can become more user friendly via colour coding …

  • country linework is black and background colour is white to start with … and …
  • as a user clicks an individual GeoJson entity the canvas element has a plotting circle created at a z-index below that of …
  • overlayed new div and SVG element initialized to infill colour rgba(255,87,51,0.5) while any other previous infills become dimmer infill colour rgba(200,200,200,0.3) … the transparency of which allows the canvas plotting circle to show through

… helping contextualize in other “drilled into” maps presented, in our changed countries.php web application you can also try below, now helped out by the tweaked mapsvg.js external Javascript helper last talked about at HTML Map Element SVG Context Google Search Tutorial. Its analysis of existent HTML webpage image map area subelements is called via a new Javascript function …


function checkdsa(ath) {
if (('' + appendtoinnerHTML).indexOf(('' + ath.coords)) != -1) {
if (document.getElementById('svgd').innerHTML.indexOf(' title=' + String.fromCharCode(34) + '' + ath.title + '' + String.fromCharCode(34) + '') != -1) {
document.getElementById('svgd').innerHTML=document.getElementById('svgd').innerHTML.replace(/rgba\(255\,87\,51\,0.5\)/g, 'rgba(200,200,200,0.3)');
document.getElementById('svgd').innerHTML+='<div title=' + String.fromCharCode(34) + '' + ath.title + appendtoinnerHTML.split(ath.coords)[1].split('<div ')[0].replace('none;', 'block;z-index:123;').replace(/\ id\=/g, ' data-id=').replace('lime;', 'rgba(255,87,51,0.5);');
} else {
document.getElementById('svgd').innerHTML=document.getElementById('svgd').innerHTML.replace(/rgba\(255\,87\,51\,0.5\)/g, 'rgba(200,200,200,0.3)');
document.getElementById('svgd').innerHTML+='<div title=' + String.fromCharCode(34) + '' + ath.title + appendtoinnerHTML.split(ath.coords)[1].split('<div ')[0].replace('none;', 'block;z-index:123;').replace('lime;', 'rgba(255,87,51,0.5);');
}
}
}

Previous relevant GeoJson World Countries Geo Chart Tutorial is shown below.

GeoJson World Countries Geo Chart Tutorial

GeoJson World Countries Geo Chart Tutorial

There are many advantages regarding today’s task to …

Integrate Google Chart Geo Chart

… as an additional “drill down” map option, functionality adding onto the work of yesterday’s GeoJson World Countries Tutorial.

What deducible data item needs to be determined for these Geo Charts to work? We need a way to deduce ISO-2 character country codes from the ISO-3 character codes existing in the GeoJson “countries.geojson” data from yesterday’s work. We happened upon the extremely generous mapping data webpage to help with these ISO-2 character deductions …

<?php

$geojsonis=file_get_contents('countries.geojson');
$parts=explode("]]", $geojsonis);
$globalattr="";
$mappings=file_get_contents('http://gist.github.com/tadast/8827699'); // thanks
if (strpos($mappings, '>IN</td>') !== false) {
$mappings.='<td>IN</td><td>KAS</td><td>EH</td><td>SAH</td><td>SO</td><td>SOL</td><td>SS</td><td>SDS</td><td>XK</td><td>KOS</td><td>CY</td><td>CYN</td></body>';
}

for ($i=0; $i<(-1 + sizeof($parts)); $i++) {
if (strpos($parts[$i], '"sr_sov_a3":"') !== false) {
$globalattr=' data-iso3="' . explode('"', explode('"sr_sov_a3":"', $parts[$i])[1])[0] . '"';
if (strpos($mappings, '>' . explode('"', explode('"sr_sov_a3":"', $parts[$i])[1])[0] . '</td>') !== false) {
$iparts=explode('>' . explode('"', explode('"sr_sov_a3":"', $parts[$i])[1])[0] . '</td>', $mappings);
$globalattr.=' data-iso2="' . explode('>', explode('</td>', $iparts[0])[-2 + sizeof(explode('</td>', $iparts[0]))])[-1 + sizeof(explode('>', explode('</td>', $iparts[0])[-2 + sizeof(explode('</td>', $iparts[0]))]))] . '"';
} else if (substr(explode('"', explode('"sr_sov_a3":"', $parts[$i])[1])[0],-1,1) >= '0' && substr(explode('"', explode('"sr_sov_a3":"', $parts[$i])[1])[0],-1,1) <= '9') {
$globalattr.=' data-iso2="' . substr(explode('"', explode('"sr_sov_a3":"', $parts[$i])[1])[0],0,2) . '"';
}
}
if (strpos($parts[$i], '"sr_subunit":"') !== false) {
$globalattr.=' data-cname="' . explode('"', explode('"sr_subunit":"', $parts[$i])[1])[0] . '"';
}
$coords=str_replace('[','',str_replace(']','',explode('[[' , $parts[$i])[-1 + sizeof(explode('[[' , $parts[$i]))]));
$newcoords=$coords;
if (!$dolatlong || 1 == 1) {
$lls=explode(",", $coords);
$newcoords="";
for ($j=0; $j<sizeof($lls); $j+=2) {
$lls[$j]=($lls[$j] + $longoff) * $factor;
$lls[$j + 1]=($lls[$j + 1] + $latoff) * $factor;
if ($newcoords != "") { $newcoords.=","; $htmlis=str_replace("}", " context.lineTo(" . $lls[$j] . ',' . ((180.0 * $factor) - $lls[$j + 1]) . "); \n}", $htmlis); } else { $htmlis=str_replace("}", " context.stroke(); \n context.beginPath(); \n context.moveTo(" . $lls[$j] . ',' . ((180.0 * $factor) - $lls[$j + 1]) . "); \n}", $htmlis); }
$newcoords.='' . $lls[$j] . ',' . ((180.0 * $factor) - $lls[$j + 1]);
}
}
$abit.="<area" . $globalattr . " onclick=\"ouralert(this.getAttribute('data-cname'),this.getAttribute('data-iso3'),this.getAttribute('data-iso2'),'Longitude,Latitude coordinates are " . $coords . "');\" shape='poly' coords='" . $newcoords . "'></area>\n";
//echo "<area type='poly' coords='" . $newcoords . "'></area>\n";
}

?>

… in our image map area elements PHP creation code above. As you can see, extra “intelligence”, moving forward, is contained in area element global data attributes.

Which leaves us with why any of this helps functionality within our changed countries.php web application you can also try below?

  • Geo Chart can zoom into a country view …
  • Geo Chart can involve emoji (🏠 &127968;) or image (SVG) circle based symbology for the “User Clicked Place” and nearby TimeZone places respectively …
  • all these symbols can be clicked to open popup windows containing TimeZone Place Wikipedia webpages of relevance …
  • an emoji national flag (eg. Zambia “ZA” could be used to derive &#127487;&#127462; 🇿🇦 flag emoji) derived from those ISO-2 character codes can supplement the GeoJson (more ISO-3 character based) names presented in the underlying data, in the Geo Chart title …
  • contextualizing the accompanying Map Chart … and …
  • vice versa regarding hovering over symbology (which works on Map Chart, but not Geo Chart) …
  • within the Map Chart iframe a “Geo” link can glean a “zoomed out” world Geo Chart view of your TimeZone places

And feel free to (re-)try our tweaked “to make thinner the coastline linework” regions.php GeoJson PHP web application in a new window, or you can also try below.

Previous relevant GeoJson World Countries Tutorial is shown below.

GeoJson World Countries Tutorial

GeoJson World Countries Tutorial

Know your GeoJson! Yes, pretty obviously, any two GeoJson datasets might display the same in that “map plotting” sense, but one might have different and/or more “intelligence” than the other. Often, an XML has more “intelligence” than equivalent HTML (barring the use of global data attributes, that is), as today’s Corollacorollary.

And so, moving on from yesterday’s GeoJson World Coastline TimeZone Tutorial, today, we present a new GeoJson admin 0 countries we download, and upload as “countries.geojson” data set, again via the excellent HTTP://geojson.xyz/ repository, thanks.

From it, we do get a different JSON additional “intelligence” …


{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"scalerank":1,"labelrank":1,"sr_sov_a3":"ZWE","sr_adm0_a3":"ZWE","sr_gu_a3":"ZWE","sr_su_a3":"ZWE","sr_subunit":"Zimbabwe","featureclass":"Admin-0 scale ranks"},"geometry":{"type":"Polygon","coordinates":[[[31.287890625000017,-22.40205078125001],[31.197265625,-22.34492187500001],[31.07343750000001,-22.30781250000001],[30.916113281250006,-22.29072265625001],[30.71162109375001,-22.2978515625],[30.46015625000001,-22.32900390625001],[30.1904296875,-22.291113281250006],[29.90234375,-22.184179687500006],[29.6630859375,-22.146289062500003],[29.37744140625,-22.19277343750001],[29.36484375,-22.193945312500006],[29.315234375000017,-22.15771484375],[29.237207031250023,-22.07949218750001],[29.106835937500023,-22.065722656250003],[29.07148437500001,-22.047460937500006],[29.042382812500023,-22.018359375],[29.023339843750023,-21.98125],[29.01582031250001,-21.93994140625],[29.03730468750001,-21.811328125],[29.02558593750001,-21.796875],[28.99072265625,-21.78144531250001],[28.919335937500023,-21.766015625],[28.74775390625001,-21.707617187500006],[28.532031250000017,-21.65126953125001],[28.181640625,-21.58935546875],[28.04560546875001,-21.573046875],[28.014062500000023,-21.55419921875],[27.974609375,-21.50673828125001],[27.90742187500001,-21.35908203125001],[27.844140625000023,-21.261523437500003],[27.693457031250006,-21.11103515625001],[27.66943359375,-21.064257812500003],[27.67695312500001,-20.94482421875],[27.688085937500006,-20.84833984375001],[27.70429687500001,-20.76640625],[27.69697265625001,-20.689746093750003],[27.69482421875,-20.59453125],[27.699609375000023,-20.53066406250001],[27.679296875,-20.503027343750006],[27.624609375,-20.48359375000001],[27.46894531250001,-20.47480468750001],[27.28076171875,-20.47871093750001],[27.27460937500001,-20.3818359375],[27.256738281250023,-20.23203125],[27.221484375000017,-20.145800781250003],[27.17822265625,-20.10097656250001],[27.091796875,-20.05419921875],[26.91669921875001,-19.99013671875001],[26.67822265625,-19.89277343750001],[26.474609375,-19.748632812500006],[26.241015625000017,-19.5693359375],[26.168066406250006,-19.53828125000001],[26.081933593750023,-19.369921875],[25.95068359375,-19.08173828125001],[25.95917968750001,-18.985644531250003],[25.939355468750023,-18.93867187500001],[25.811914062500023,-18.79707031250001],[25.78369140625,-18.72353515625001],[25.76123046875,-18.64921875],[25.55830078125001,-18.441796875],[25.4892578125,-18.35126953125001],[25.43671875000001,-18.234960937500006],[25.384375,-18.14199218750001],[25.340234375000023,-18.1044921875],[25.28242187500001,-18.04121093750001],[25.242285156250006,-17.969042968750003],[25.224023437500023,-17.91523437500001],[25.239062500000017,-17.843066406250003],[25.2587890625,-17.793554687500006],[25.451757812500006,-17.84511718750001],[25.55712890625,-17.84951171875001],[25.6396484375,-17.82412109375001],[25.741601562500023,-17.858203125],[25.86328125,-17.951953125],[25.995898437500017,-17.969824218750006],[26.139550781250023,-17.91171875],[26.333398437500023,-17.929296875],[26.577539062500023,-18.022558593750006],[26.779882812500006,-18.04150390625],[27.020800781250017,-17.95839843750001],[27.235742187500023,-17.728320312500003],[27.437890625000023,-17.51191406250001],[27.63671875,-17.262109375],[27.75654296875001,-17.060351562500003],[27.932226562500006,-16.89619140625001],[28.16376953125001,-16.76972656250001],[28.399804687500023,-16.66279296875001],[28.760644531250023,-16.53193359375001],[28.760546875000017,-16.53212890625001],[28.83271484375001,-16.424121093750003],[28.856738281250017,-16.30615234375],[28.856738281250017,-16.14228515625001],[28.875585937500006,-16.0361328125],[28.9130859375,-15.98779296875],[28.973046875000023,-15.950097656250009],[29.050585937500017,-15.901171875],[29.287890625000017,-15.776464843750006],[29.4873046875,-15.69677734375],[29.729589843750006,-15.644628906250006],[29.994921875000017,-15.64404296875],[30.25068359375001,-15.643457031250009],[30.39609375,-15.64306640625],[30.39814453125001,-15.80078125],[30.409375,-15.978222656250011],[30.437792968750017,-15.995312500000011],[30.630175781250017,-15.999218750000011],[30.938769531250017,-16.01171875],[31.236230468750023,-16.02363281250001],[31.426171875000023,-16.15234375],[31.48984375,-16.1796875],[31.687597656250006,-16.214160156250003],[31.939843750000023,-16.428808593750006],[32.243261718750006,-16.44873046875],[32.45195312500002,-16.515722656250006],[32.635839843750006,-16.589453125],[32.741796875,-16.67763671875001],[32.81025390625001,-16.69765625],[32.902929687500006,-16.704199218750006],[32.94804687500002,-16.71230468750001],[32.93789062500002,-16.775976562500006],[32.87626953125002,-16.88359375],[32.884375,-17.03779296875001],[32.969335937500006,-17.2515625],[32.98076171875002,-17.4375],[32.9546875,-17.765429687500003],[32.95556640625,-18.08291015625001],[32.96464843750002,-18.1962890625],[32.978515625,-18.271484375],[32.99638671875002,-18.312597656250006],[32.99306640625002,-18.35957031250001],[32.942480468750006,-18.49267578125],[32.90166015625002,-18.632910156250006],[32.90029296875002,-18.6890625],[32.88457031250002,-18.728515625],[32.8544921875,-18.763671875],[32.72197265625002,-18.828417968750003],[32.69921875,-18.868457031250003],[32.69970703125,-18.94091796875],[32.71650390625001,-19.00185546875001],[32.766210937500006,-19.02431640625001],[32.826171875,-19.05878906250001],[32.84980468750001,-19.10439453125001],[32.85,-19.152441406250006],[32.83095703125002,-19.24140625000001],[32.77763671875002,-19.388769531250006],[32.83076171875001,-19.558203125],[32.89042968750002,-19.668066406250006],[32.97265625,-19.79541015625],[33.00673828125002,-19.873828125],[33.0048828125,-19.93017578125],[32.992773437500006,-19.98486328125],[32.86962890625,-20.2171875],[32.780859375,-20.36152343750001],[32.67255859375001,-20.51611328125],[32.529296875,-20.613085937500003],[32.49238281250001,-20.659765625],[32.477636718750006,-20.712988281250006],[32.48281250000002,-20.82890625],[32.476171875,-20.95009765625001],[32.353613281250006,-21.136523437500003],[32.429785156250006,-21.29707031250001],[32.41240234375002,-21.311816406250003],[32.37109375,-21.33486328125001],[32.19472656250002,-21.515429687500003],[32.01630859375001,-21.698046875],[31.88593750000001,-21.83154296875],[31.737695312500023,-21.9833984375],[31.57148437500001,-22.15351562500001],[31.429492187500017,-22.298828125],[31.287890625000017,-22.40205078125001]]]}}

… and “mapping look” because country borders are added in, and some JSON attributes we can call on to allow for …

  • the similar Google Chart Map Chart maps introduced yesterday into the user interaction mix … as well as …
  • Wikipedia, thanks, webpage lookup possibilities calling on those new GeoJson property attributes presented within the dataset above

We enable this, as we just add in some Javascript popup window type equals “prompt” to the existant “confirm” and “alert” logic of yesterday.

Feel free to try the how we got there regions.php GeoJson PHP World Countries web application in a new window, or below …

Previous relevant GeoJson World Coastline TimeZone Tutorial is shown below.

GeoJson World Coastline TimeZone Tutorial

GeoJson World Coastline TimeZone Tutorial

Luckily for programmers all over, the organization of TimeZones has had an International flavour in its development and maintenance. As such, given the “purely coastline” GeoJson data involved in our fledgling PHP web application of yesterday’s GeoJson World Coastline Primer Tutorial a useful arrangement for improvement involves …

  • document.body onclick event co-ordinates … able to be converted to …
  • longitude, latitude (easily, only because of our simplistic map projection, of course) … onfed to …
  • our inhouse “TimeZone Places” web application PHP helper

… can have us helping out your curious web “clicking” user with the 3 nearest TimeZone places, as a reference as to where they are “clicking” in the world.

Feel free to try our improved regions.php GeoJson PHP web application in a new window, or below …

Stop Press

Our efforts in making our new tweaked regions.php GeoJson PHP web application more mobile platform user friendly reminds us about a salutary issue regarding touch gestures …

  • in a discrete click methodology of interest, you could adopt a non-mobile “onmousedown” logic set that does not get interfered with by a mobile “ontouchdown” logic set (perhaps leaving “onclick” event, which both non-mobile and mobile both recognise, for another event logic role) … and …
  • neither will interrupt the mobile gestures associated with swiping and pinching, which refer to the events “ontouchstart” and “ontouchend” at either end of their lifespan

Previous relevant GeoJson World Coastline Primer Tutorial is shown below.

GeoJson World Coastline Primer Tutorial

GeoJson World Coastline Primer Tutorial

We’re keen to further explore the possibilities of GeoJson public data sets, further to yesterday’s Swift Playgrounds on macOS Map Emoji Tutorial.

And then we remembered some of the methodologies we used with Responsive Web Design Landing Page Image Map Tutorial, talking about image maps …

And so, we arrive at a long planned for tilt at Image Map functionality that we often turn to Mobilefish.Com and its excellent Image Map Creation to help us out … but not today?! Why not? We have a funny set of needs, they being …

  • our Image Map’s image will have a variable set of width x height dimensions …
  • our Image Map’s image will be transparent
  • our Image Map needs to have a hole left aside inside it where the functionality that originally existed (and pointed to WordPress Blog content like you are reading), is still working

… the first two ideas of which, along with …

… in our “early days” “proof of concept” regions.php GeoJson PHP web application.

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