PirateMap

by fogleman

fogleman / PirateMap

Procedurally generate pirate treasure maps.

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Pirate Maps

Procedurally generated pirate treasure maps. X marks the spot!

Example

Dependencies

I used several excellent third party libraries...

  • cairo
    for rendering
  • colour
    for color interpolation
  • noise
    for simplex noise
  • Pillow
    for saving debug images of noise layers
  • pyhull
    for delaunay triangulation
  • Shapely
    for all kinds of 2D geometry operations

How to Run

The script will generate several random maps and save them as PNG files.

git clone https://github.com/fogleman/PirateMap.git
cd PirateMap
pip install -r requirements.txt
python main.py

How it Works

It took me a while to decide on an approach for generating the land masses. I didn't want to just generate some simplex noise, threshold it and render it. I wanted to actually compute a polygonal shape that I could do further operations on. So here's how that works...

  • generate a layer of simplex noise with several octaves, with decreasing values as the edge of the image is approached
  • fill the screen with randomly positioned points evenly spaced using the poisson disc algorithm
  • filter the poisson points to those where the corresponding noise value is above some threshold
  • take these points and compute a "concave" hull or alpha shape with them

Shapely's

buffer
function is used heavily for padding or cleaning up shapes.

I also wrote an

xkcdify
function to add some perturbations to some of the polygons, namely the different water color gradations.

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