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pngspark
Sparklines as PNGs
Install
make
[sudo] make install [PREFIX=/usr/local]
Usage
pngspark [-h height] [-c color] [-s scaling] output.png
Pipe numbers to pngspark to add them to the image.
Options
-h height
: the height of the image in pixels-c color
: the color of the foreground, as #rrggbb hex-s scaling
: scaling factor. 0 to do no scaling, 1 to make the minimum value be at the bottom of the image
Examples
Display BTC ticker data
curl -s https://api.bitcoinaverage.com/history/USD/per_minute_24h_sliding_window.csv | sed 1d | cut -d, -f2 | ./pngspark -o btc.png -s 0.995 -h 80 -c 0066cc
Show a sine wave
seq 1 720 | awk '{print sin($1/30)}' | ./pngspark -o sine.png -h 30 -c 33c011
API
struct pngspark;
A png spark instance: collection of values and settings.
int pngspark_init(struct pngspark *ps, size_t height, const char *color, double scaling);
Initialize a pngspark struct.
int pngspark_append(struct pngspark *ps, double, value);
Append a value to the pngspark.
int pngspark_write(struct pngspark *ps, FILE *file);
Process the values and write as a PNG to a file.
int pngspark_end(struct pngspark *ps);
Release allocated memory for the pngspark. (Does not free ps
, however).
License
MIT
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