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# ocean tiles
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In order to have the ocean and land on the canvas, or any other background pic, we have to create tiles that we can later upload to the canvas with drawOcean.js.
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Those are the commands to create tiles in subfolders:
- create folder for tiles:
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```
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mkdir ./ocean
cd ocean
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```
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- to split image into tiles:
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```
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convert ../ocean.png -crop 128x128 +adjoin ocean_tiles%02d.png
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```
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- upscale and convert to black and white
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```
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mogrify -resize 2048x2048 -colors 2 -white-threshold 80% -black-threshold 80% ocean_tiles*.png
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```
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or without dithering:
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```
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mogrify +dither -resize 2048x2048 -colors 2 -white-threshold 80% -black-threshold 80% ocean_tiles*.png
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```
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- create subfolders
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```
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for i in {0..31}; do mkdir $i; done
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```
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- put into subfolders
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```
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for file in ./ocean_tiles*.png; do NUM=`echo $file | sed -e 's/.*ocean_tiles//' -e 's/.png//'`; Y=$(expr $NUM / 32); X=$(expr $NUM % 32); newfile="$X/$Y.png"; mv $file $newfile; done
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```
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- to remove the subfolders again
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```
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for i in {0..31}; do rm -r $i; done
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```
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# createOceanTiles.js
createOceanTiles is splitting the generated ocean tiles into 256x256 tiles, skipping the ones that are empty (aka all ocean).
