image-manage.js

var
  gm = require('gm'),
	properties = require('../../properties').getProperties(),
	fs = require('fs');

module.exports.createImageManager = function() {

	function resizeAndCrop(hash, filename, width, height, crop, callback) {
		var
			newCachedLocation,
			currentFileLocation = properties.dataPath + hash + '/' + filename;

		console.log('###', currentFileLocation);

		gm(currentFileLocation).size(function(error, value) {
			var
				sourceWidth = value.width,
				sourceHeight = value.height,
				widthAspectRatio = width / sourceWidth,
				heightAspectRatio = height / sourceHeight,
				destinationWidth = width,
				destinationHeight = height,
				widthOffset = (value.width / 2) - (width / 2),
				heightOffset = (value.height / 2) - (height/2);

			if (crop) {
				newCachedLocation = properties.cachePath + '/' + hash + '/' + width + 'x' + height + 'c' + '_' + filename;
				console.log('cropping');
				if (widthAspectRatio > heightAspectRatio) {
					sourceHeight = height;
					sourceWidth = width;
				} else {
					sourceHeight = height;
					sourceWidth = width;
				}

				console.log(destinationWidth, destinationHeight, widthOffset, heightOffset);

				gm(currentFileLocation).colorspace('rgb').crop(destinationWidth, destinationHeight, widthOffset, heightOffset).write(newCachedLocation, function(error) {
					if (error) {
						callback(error, null);
					} else {
						callback(null, newCachedLocation);
					}
				});
			} else {
				newCachedLocation = properties.cachePath + '/' + hash + '/' + width + 'x' + height + '_' + filename;
				console.log('shrinking');

				if (widthAspectRatio > heightAspectRatio) {
					destinationWidth = sourceWidth * heightAspectRatio;
					destinationHeight = sourceHeight * heightAspectRatio;
				} else {
					destinationWidth = sourceWidth * widthAspectRatio;
					destinationHeight = sourceWidth * widthAspectRatio;
				}

				console.log(widthAspectRatio, heightAspectRatio, destinationWidth, destinationHeight);

				gm(currentFileLocation).colorspace('rgb').resize(destinationWidth, destinationHeight).write(newCachedLocation, function(error) {
					if (error) {
						callback(error, null);
					} else {
						callback(null, newCachedLocation);
					}
				});
			}
		});
	}

	return {
		resizeAndCrop: resizeAndCrop
	};
};