initial version

Dockerfile

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+FROM nolimitid/node-phantom
+
+RUN set -ex \
+ && apt-get update \
+ && apt-get install -y imagemagick
+
+VOLUME ["/data"]
+ENTRYPOINT ["/usr/local/bin/run.sh"]
+CMD []
+
+ADD index.js /src/index.js
+ADD run.sh /usr/local/bin/run.sh

index.js

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+var page = require('webpage').create(),
+    system = require('system');
+
+browser_width = 2560
+browser_height = browser_width / 297 * 210
+
+page.viewportSize = { width: browser_width, height: browser_height };
+page.settings.webSecurityEnabled = false
+page.settings.resourceTimeout = 5000
+page.settings.localToRemoteUrlAccessEnabled = true
+
+if (system.args.length !== 4) {
+  console.log('Usage: '+system.args[0]+' <zoom> <lat> <lon>');
+  phantom.exit();
+}
+
+var url = [
+  'http://openfiremap.org/',
+  '?zoom=', system.args[1],
+  '&lat=', system.args[2],
+  '&lon=', system.args[3],
+  '&layers=B0000TF',
+].join('');
+
+console.log("Fetching URL " + url);
+
+page.open(url, function(status) {
+  if (status !== 'success') {
+    console.log('Unable to load the address!');
+    phantom.exit();
+  } else {
+    window.setTimeout(function () {
+      page.render('/data/shot.png');
+      phantom.exit();
+    }, 5000); // Change timeout as required to allow sufficient time
+  }
+});

run.sh

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+#!/bin/bash -ex
+
+DPI=150
+W=1754 # 150 x 11.69
+H=1241 # 150 x  8.27
+
+/usr/bin/phantomjs /src/index.js "$@"
+
+TARGET="map_$(date +%Y-%m-%d_%H-%M)"
+mv /data/shot.png /data/${TARGET}.png
+
+#exec convert /data/${TARGET}.png -compress jpeg -quality 90 \
+#  -resize ${W}x${H} -density ${DPI} \
+#  -repage ${W}x${H} /data/${TARGET}.pdf
+exec convert /data/${TARGET}.png -compress jpeg -quality 90 \
+  -resize ${W}x${H} -gravity center -extent ${W}x${H} \
+  -units PixelsPerInch -set density ${DPI} \
+  -repage ${W}x${H} /data/${TARGET}.pdf