walkermatt

""" Minimal MapProxy Middleware demonstrating the decorate_img API

To run:
  1. Install MapProxy in a virtual enviroment together with Gunicorn
  2. Create a basic MapProxy config and copy this file into the same directory as mapproxy.yaml
  2. Activate virtual environment
  3. Change to the directory containing this file
  4. Run:
      gunicorn -k eventlet --workers=1 --log-file=- mapproxy_decorate:application

walkermatt

# Rock, paper, scissors

def beats(thing1, thing2):
  """ Determine who wins rock, paper, scissors
  by passing each players choice """
  if thing1 == thing2:
    # Draw, both players chose the same thing
    return None
  # Determine which thing beats thing2
  victors = {

walkermatt

Python psycopg2 & PostGIS

Load some data into the database

From the OSGeo4W Shell

ogr2ogr -f PostgreSQL PG:"dbname=postgis host=localhost user=postgres password=postgres" -a_srs "EPSG:27700" county_region.shp -nlt MULTIPOLYGON

Use psycopg2 in the Python Interpreter

walkermatt

import itertools
import qgis
from qgis.gui import QgsMessageBar
from qgis.core import QgsMapLayer


def layer_info(layer):
    print "Layer name: %s" % layer.name()
    print "CRS: %s" % layer.crs().authid()
    print "Extent: %s" % layer.extent().asWktCoordinates()

walkermatt

# Just the selected features
layer = iface.activeLayer()
for feature in layer.selectedFeatures():
    print feature['name']

# Filter by current extent of the map 
extent = iface.mapCanvas().extent()
request = QgsFeatureRequest()
request.setFilterRect(extent)
layer = iface.activeLayer()

walkermatt

""" Minimal MapProxy Middleware demonstrating wrapping MapProxy and working
    with the query string

To run:
  1. Install MapProxy in a virtual enviroment together with Gunicorn
  2. Create a basic MapProxy config and copy this file into the same directory as mapproxy.yaml
  2. Activate virtual environment
  3. Change to the directory containing this file
  4. Run:
      gunicorn -k eventlet --workers=1 --log-file=- mapproxy_filter:application

walkermatt

// OpenLayers. See https://openlayers.org/
// License: https://raw.githubusercontent.com/openlayers/openlayers/master/LICENSE.md
// Version: v4.5.0-70-gfca0b07
;(function (root, factory) {
  if (typeof exports === "object") {
    module.exports = factory();
  } else if (typeof define === "function" && define.amd) {
    define([], factory);
  } else {
    root.ol = factory();

walkermatt

function escapeAsCsv(str) {
    // Double up double quotes and quote the entire string if necessary
    if (str.includes(',') || str.includes('\n') || str.includes('"')) {
        return '"' + str.replace(/"/g, '""') + '"';
    }
    return str;
}

// Export Confluence table as CSV
// Select the tbody element in Chrome devtools Elements panel then run the

walkermatt

npx @marp-team/marp-cli --template bare -o ol-layerswitcher-typescript.html presentation.md

walkermatt

The day the build broke 😔

The tale of a broken build and breaking changes...

---

And so the story begins...

• ol-ishare is built automatically each time a change is committed to the repository
  • Formatting of source code is checked (linting)