54 lines
1.6 KiB
Markdown
54 lines
1.6 KiB
Markdown
PixelCanvas.io downloader
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This utility lets you download the http://pixelcanvas.io bitmap and export regions of it to .png files.
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# Requirements
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pip install -r requirements.txt
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# Usage
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This tool is run from the command line, where you provide the coordinates you
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want to download and render.
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The format for typing coordinates is `UPPERLEFT--LOWERRIGHT`. The format for
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each of those pieces is `X.Y`.
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Sometimes, argparse gets confused by negative coordinates because it thinks
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you're trying to provide another argument. Sorry.
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If this happens, use a tilde `~` as the negative sign instead.
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Remember, because this is an image, up and left are negative;
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down and right are positive.
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Commands:
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- **update**: Download chunks into the database.
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`> pixelcanvas.py update ~100.~100--100.100`
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- **render**: Export a region as PNG.
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`> pixelcanvas.py render 0.0--100.100 <flags>`
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So, for example:
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> pixelcanvas.py update 0.0--100.100
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> pixelcanvas.py update ~100.~100--100.100
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> pixelcanvas.py update ~1200.300--~900.600
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> pixelcanvas.py render 0.0--100.100
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> pixelcanvas.py render ~100.~100--100.100 --update
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> pixelcanvas.py render ~1200.300--~900.600 --show
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> pixelcanvas.py render ~2000.2000--2000.2000 --scale 0.25
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# To do
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Here are some things we might like to improve:
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- Some way to get a statistics overview or visual map of which chunks we have in the database, so we know what we're missing.
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- Render the image as it appeared at some point in the past, taking advantage of the `updated_at` column.
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- Probably never going to happen: A GUI application to browse the db just like the site.
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