glitchin/lib/filters/offset-columns.js

Glitch Art package

'use strict';

var _              = require('lodash'),
	Const          = require('../config/constants'),
	Utils          = require('../modules/utils'),
	OffsetInColumn = require('../modules/offset-in-column'),
	debug          = require('debug')('filter/offset-columns');

module.exports = function( image, offset ){
	Utils.check.image(image, 'Offset Columns');

	if( !Utils.hasRgbParameter(offset, image.bitmap.height) ){
		offset = Utils.createRgbParameters();
	}

	debug('Offsetting columns...');

	try {
		Utils.defineChannels(image);

		_.each(offset, function( value, key ){
			_.set(image[Const.CHANNELS], key, Utils.mapChannel(image.glitch.columns, key));

			if( _.includes(Const.POSSIBLE_CHANNELS, key) ){
				image = OffsetInColumn(image, key, value);
			}
		});

		Utils.deleteChannels(image);
	} catch( e ){
		debug('Error offsetting columns. Attempting to continue. ' + e);
	}

	return image;
};