davvo/node-gnuplot

A thin wrapper around gnuplot for node.js

node-gnuplot's Issues

direct access to term libraries as an alternative to canvas and cairo

Have you seen a project which uses gnuplot's term library api (is there one) as an alternative to node-canvas and cairo? Say I want to write a new term and want to access it like canvas from vega-scenegraph to write to a PLY or STL 3d printer file? Thanks!

Add 'replot' command

it would be nice to add the replot command :)

add pause support

if you add 'pause', then running from command line can open x11 windows.

in gnuplot.js
['set', 'unset', 'plot', 'splot', 'replot','pause'].forEach(function (name) {

thanks.

Error handling?

Is there any error handling in this? What happens when an instruction (string) given to gnuplot creates and error and fails to produce a plot? I'm not seeing any obvious way to get feedback if something fails. Thanks!

set is not working correctly

Callback before image generation finish

Hi, I'm using gnuplot in order to create an image and send it in Telegram, the function it's like this:

function img_generation (result, callback) {

  let plot = gnuplot()
    .set('terminal png medium size 400,300')
    .set('output "out.png"')
    .set('title "Isotopic distribution"')
    .unset('key') // no legend
    .set('border 3')
    .set('xlabel "m/z (Da)"')
    .set('ylabel "Intensity (%)"')
    .set('ytics nomirror') // hide ticks left
    .set('xtics nomirror') // hide ticks top
    .set('grid xtics lw 1 lc rgb "#dddddd"')
    .set('grid ytics lw 1 lc rgb "#dddddd"')
    .set('xrange [' + result.chartXFrom + ':' + result.chartXTo + ']')
    .set('yrange [0:120]');

  result.xy.forEach( (point) => {
    plot.set('arrow from ' + point[0] + ',0 to ' + point[0] + ',' + point[1] * 100 + ' nohead lw 2 lc rgb "blue"');
  });
  plot.plot('sin(x) lc rgb "white"');
  plot.end( (err) => {
    if (err) console.error(err);

   // here I send the image
    bot.sendPhoto(fromId, 'out.png');
  });
}

The problem is that the image it's trying to be sended before it's generated, do you have any idea why it's that happening?

Thanks, I love your module 👍