tapspace/lib/SpaceImage.js

A zoomable user interface lib for web apps

/* global HTMLImageElement, Image */
//
// SpaceImage
//
var AbstractRectangle = require('./AbstractRectangle')
var extend = require('extend')

var SpaceImage = function (img, parent) {
  // Parameters:
  //   img
  //     a preloaded HTMLImageElement or an image literal (see below).
  //   parent
  //     a AbstractNode, optional, default to null
  //
  // Image literal:
  //   {
  //     src: <string>
  //     width: <int>
  //     height: <int>
  //   }
  //
  if (typeof img !== 'object') {
    throw new Error('Invalid image')
  }
  AbstractRectangle.call(this)

  if (img instanceof HTMLImageElement) {
    this.image = img
  } else {
    // Image literal.
    this.image = new Image(img.width, img.height)
    this.image.src = img.src
  }

  this.setSize(img.width, img.height) // Size of the rectangle

  if (typeof parent === 'object') {
    this.setParent(parent)
  }
}

SpaceImage.prototype = extend({}, AbstractRectangle.prototype)

SpaceImage.prototype.copy = function () {
  // Return a copy of the SpaceImage.
  // The copy has the same image and size but is not attached to a parent.
  //
  var si = new SpaceImage(this.image)
  si.setSize(this.getSize())
  return si
}

SpaceImage.prototype.getImage = function () {
  return this.image
}

module.exports = SpaceImage