add generate svg country maps tutorial

Author: x4nth055

README.md

@@ -118,6 +118,7 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
     - [How to Make a Text Adventure Game in Python](https://www.thepythoncode.com/article/make-a-text-adventure-game-with-python). ([code](general/text-adventure-game))
     - [Zipf's Word Frequency Plot with Python](https://www.thepythoncode.com/article/plot-zipfs-law-using-matplotlib-python). ([code](general/zipf-curve))
     - [How to Plot Weather Temperature in Python](https://www.thepythoncode.com/article/interactive-weather-plot-with-matplotlib-and-requests). ([code](general/interactive-weather-plot/))
+    - [How to Generate SVG Country Maps in Python](https://www.thepythoncode.com/article/generate-svg-country-maps-python). ([code](general/generate-svg-country-map))
 
 
 

general/generate-svg-country-map/README.md

@@ -0,0 +1 @@
+# [How to Generate SVG Country Maps in Python](https://www.thepythoncode.com/article/generate-svg-country-maps-python)

general/generate-svg-country-map/requirements.txt

@@ -0,0 +1 @@
+pycountry

general/generate-svg-country-map/svg_country_maps.py

@@ -0,0 +1,100 @@
+# Default Library
+import requests
+import json
+import os
+
+# Download with pip install pycountry
+import pycountry
+
+for country in list(pycountry.countries):
+
+    # All Points from all Groups
+    # used to analyze
+    allPoints = []
+
+    # Countries that dont consist of one body 
+    # will have multiple groups of coordinates
+    pointGroups = []
+
+    # Country Code with 3 letters
+    countryCode = country.alpha_3
+    countryName = country.name
+
+    # Check if the SVG file already Exists and skip if it does
+    if os.path.exists(f'output/{countryName}.svg'):
+        print(f'{countryName}.svg Already exists ... Skipping to next Country\n')
+        continue
+
+    print('Generating Map for: ', countryName)
+
+    # Get the Data
+    re = requests.get(f'https://geodata.ucdavis.edu/gadm/gadm4.1/json/gadm41_{countryCode}_0.json')
+
+    # If the string cant be parsed an invalid country was requested
+    try:
+        data = json.loads(re.text)
+    except json.decoder.JSONDecodeError:
+        print('Could not decode ... Skipping to next Country\n')
+        continue
+
+    # Organise the Data 
+    # Get the groups and all coordinates
+    for i in data['features'][0]['geometry']['coordinates']:
+        for group in i:
+            pointGroups.append(group)
+            for coord in group:
+                allPoints.append(coord)
+
+    print(f'\n{len(allPoints)} Points')
+
+    # Analyse Data
+    # Use these Information to calculate 
+    # offset, height and width of the Country
+    lowestX = 9999999999
+    highestX = -9999999999
+
+    lowestY = 9999999999
+    highestY = -9999999999
+
+    for x, y in allPoints:
+        lowestX = x if x < lowestX else lowestX
+        highestX = x if x > highestX else highestX
+
+        lowestY = y if y < lowestY else lowestY
+        highestY = y if y > highestY else highestY
+
+    print('lowestX', lowestX)
+    print('highestX', highestX)
+
+    print('lowestY', lowestY)
+    print('highestY', highestY)
+
+    svgWidth = (highestX - lowestX)
+    svgHeight = (highestY - lowestY)
+
+    # Transfrom Points to Polygon Strings
+    polygonString = ''
+    for group in pointGroups:
+        coordinateString = ''
+        for x, y in group:
+            x  = (x - lowestX)
+            y  = (y - lowestY)
+            
+            coordinateString = coordinateString + f'{x},{y} '
+
+        polygonString += f'<polygon points="{coordinateString}"></polygon>'
+
+    svgContent = f"""
+    <svg width="{svgWidth}" height="{svgHeight}" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="transform: scale(1, -1)">
+        {polygonString}
+    </svg>
+    """
+
+    # make the output folder
+    if not os.path.isdir("output"):
+        os.mkdir("output")
+    # write the svg file
+    with open(f'output/{countryName}.svg', 'w') as f:
+        f.write(svgContent)
+    # new line
+    print('\n')