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finish work part 1
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/*
* JavaScript Load Image Orientation
* https://github.com/blueimp/JavaScript-Load-Image
*
* Copyright 2013, Sebastian Tschan
* https://blueimp.net
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/MIT
*/
/*global define, module, require, window */
;(function (factory) {
'use strict'
if (typeof define === 'function' && define.amd) {
// Register as an anonymous AMD module:
define(['load-image'], factory)
} else if (typeof module === 'object' && module.exports) {
factory(require('./load-image'))
} else {
// Browser globals:
factory(window.loadImage)
}
}(function (loadImage) {
'use strict'
var originalHasCanvasOption = loadImage.hasCanvasOption
var originalTransformCoordinates = loadImage.transformCoordinates
var originalGetTransformedOptions = loadImage.getTransformedOptions
// This method is used to determine if the target image
// should be a canvas element:
loadImage.hasCanvasOption = function (options) {
return !!options.orientation ||
originalHasCanvasOption.call(loadImage, options)
}
// Transform image orientation based on
// the given EXIF orientation option:
loadImage.transformCoordinates = function (canvas, options) {
originalTransformCoordinates.call(loadImage, canvas, options)
var ctx = canvas.getContext('2d')
var width = canvas.width
var height = canvas.height
var styleWidth = canvas.style.width
var styleHeight = canvas.style.height
var orientation = options.orientation
if (!orientation || orientation > 8) {
return
}
if (orientation > 4) {
canvas.width = height
canvas.height = width
canvas.style.width = styleHeight
canvas.style.height = styleWidth
}
switch (orientation) {
case 2:
// horizontal flip
ctx.translate(width, 0)
ctx.scale(-1, 1)
break
case 3:
// 180° rotate left
ctx.translate(width, height)
ctx.rotate(Math.PI)
break
case 4:
// vertical flip
ctx.translate(0, height)
ctx.scale(1, -1)
break
case 5:
// vertical flip + 90 rotate right
ctx.rotate(0.5 * Math.PI)
ctx.scale(1, -1)
break
case 6:
// 90° rotate right
ctx.rotate(0.5 * Math.PI)
ctx.translate(0, -height)
break
case 7:
// horizontal flip + 90 rotate right
ctx.rotate(0.5 * Math.PI)
ctx.translate(width, -height)
ctx.scale(-1, 1)
break
case 8:
// 90° rotate left
ctx.rotate(-0.5 * Math.PI)
ctx.translate(-width, 0)
break
}
}
// Transforms coordinate and dimension options
// based on the given orientation option:
loadImage.getTransformedOptions = function (img, opts) {
var options = originalGetTransformedOptions.call(loadImage, img, opts)
var orientation = options.orientation
var newOptions
var i
if (!orientation || orientation > 8 || orientation === 1) {
return options
}
newOptions = {}
for (i in options) {
if (options.hasOwnProperty(i)) {
newOptions[i] = options[i]
}
}
switch (options.orientation) {
case 2:
// horizontal flip
newOptions.left = options.right
newOptions.right = options.left
break
case 3:
// 180° rotate left
newOptions.left = options.right
newOptions.top = options.bottom
newOptions.right = options.left
newOptions.bottom = options.top
break
case 4:
// vertical flip
newOptions.top = options.bottom
newOptions.bottom = options.top
break
case 5:
// vertical flip + 90 rotate right
newOptions.left = options.top
newOptions.top = options.left
newOptions.right = options.bottom
newOptions.bottom = options.right
break
case 6:
// 90° rotate right
newOptions.left = options.top
newOptions.top = options.right
newOptions.right = options.bottom
newOptions.bottom = options.left
break
case 7:
// horizontal flip + 90 rotate right
newOptions.left = options.bottom
newOptions.top = options.right
newOptions.right = options.top
newOptions.bottom = options.left
break
case 8:
// 90° rotate left
newOptions.left = options.bottom
newOptions.top = options.left
newOptions.right = options.top
newOptions.bottom = options.right
break
}
if (options.orientation > 4) {
newOptions.maxWidth = options.maxHeight
newOptions.maxHeight = options.maxWidth
newOptions.minWidth = options.minHeight
newOptions.minHeight = options.minWidth
newOptions.sourceWidth = options.sourceHeight
newOptions.sourceHeight = options.sourceWidth
}
return newOptions
}
}))
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