scale-factor

Calculate scale factors for image resizing

Installation

installing with npm:

$ npm install scale-factor --save

Usage:

To calculate scale factors:

var sf = require('scale-factor');

var mode = sf.mode;
var modifier = sf.modifier;

var params = {
  // width & height of the source image
  originalWidth: 640,
  originalHeight: 480,
  
  // width & height of the target image
  desiredWidth: 240,
  desiredHeight: 320,
  
  // scale options
  scaleMode: mode.fit,
  modeModifier: modifier.detect_proportions
};

var factors = sf.calc(params); // { factorX: 0.5, factorY: 0.5 }

API

.scale(originalWidth, originalHeight, desiredWidth, desiredHeight, scaleMode, modeModifier)

.scale(params)

params is an object with the following properties:

originalWidth: number
originalHeight: number
desiredWidth: number
desiredHeight: number
scaleMode: mode.none | mode.fit | mode.fit_any | mode.stretch
modeModifier: modifier.none | modifier.no_scale_up | modifier.detect_proportions

scale-function returns an object: { factorX: number, factorY: number }

Tests

To run the tests for scale-factor:

$ npm test

Contact

[Grigoriy Chudnov] (mailto:g.chudnov@gmail.com)

License

Distributed under the The MIT License (MIT).

gchudnov/scale-factor