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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,256 @@ | ||
| /* This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | ||
|
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| 'use strict'; | ||
|
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| define([ | ||
| ], | ||
| function () { | ||
| var DISPLAY_LENGTH = 240; | ||
| var EXPORT_LENGTH = 480; | ||
| var DEFAULT_GUTTER = 40; | ||
|
|
||
| /* | ||
| * options: { | ||
| * src: The image source. Data URIs are okay. Required. | ||
| * width: The image width. Required. | ||
| * height: The image height. Required. | ||
| * horizontalGutter: The amount of space between the crop zone and the sides of the wrapper | ||
| * verticalGutter: The amount of space between the crop zone and the top/bottom of the wrapper | ||
| * displayLength: The length of the crop square during cropping | ||
| * exportLength: The length of the final cropped image | ||
| * } | ||
| */ | ||
| function Cropper (options) { | ||
| this.DISPLAY_LENGTH = options.displayLength || DISPLAY_LENGTH; | ||
| this.EXPORT_LENGTH = options.exportLength || EXPORT_LENGTH; | ||
|
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| this.top = 0; | ||
| this.left = 0; | ||
| this.yCenter = 0; | ||
| this.xCenter = 0; | ||
| this.verticalGutter = typeof options.verticalGutter !== 'undefined' ? | ||
| options.verticalGutter : | ||
| DEFAULT_GUTTER; | ||
| this.horizontalGutter = typeof options.horizontalGutter !== 'undefined' ? | ||
| options.horizontalGutter : | ||
| DEFAULT_GUTTER; | ||
|
|
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| this._setupComponent(options.component); | ||
|
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| if (options.src) { | ||
| this.setImageSrc(options.src, options.width, options.height); | ||
| } | ||
| } | ||
|
|
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| Cropper.prototype._setupComponent = function (component) { | ||
| var self = this; | ||
|
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| this.component = component; | ||
| this.img = component.find('img'); | ||
| this.wrapper = component.find('.wrapper'); | ||
| this.canvas = component.find('canvas')[0]; | ||
|
|
||
| this.draggable = component.find('.drag-overlay'); | ||
| this.draggable.draggable({ | ||
| drag: function (e, ui) { | ||
| var pos = self.getBoundedPosition(self.top + ui.position.top, self.left + ui.position.left); | ||
| self.img.css(pos); | ||
| }, | ||
| stop: function (e, ui) { | ||
| var pos = self.img.position(); | ||
| self.updatePosition(pos); | ||
| ui.helper.css({ top: 0, left: 0 }); | ||
| } | ||
| }); | ||
|
|
||
| this.slider = component.find('[type=range]'); | ||
| this.slider.on('input', function (e) { | ||
| self.resize(parseInt(this.value, 10)); | ||
| }); | ||
| this.scale = parseInt(this.slider.val(), 10); | ||
|
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| this.rotater = component.find('.rotate'); | ||
| this.rotater.on('click', function (e) { | ||
| var data = self.rotate(90); | ||
| self.setImageSrc(data, self._originalHeight, self._originalWidth); | ||
| }); | ||
|
|
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| component.find('.zoom-out').on('click', function () { | ||
| self.resize(self.scale - 10); | ||
| self.slider.val(self.scale); | ||
| }); | ||
|
|
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| component.find('.zoom-in').on('click', function () { | ||
| self.resize(self.scale + 10); | ||
| self.slider.val(self.scale); | ||
| }); | ||
|
|
||
| // Cache some invariants | ||
| this._wrapperHeight = this.wrapper.height(); | ||
| this._wrapperWidth = this.wrapper.width(); | ||
|
|
||
| }; | ||
|
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| Cropper.prototype.updatePosition = function (pos) { | ||
| this.yCenter = pos.top + this._height / 2; | ||
| this.xCenter = pos.left + this._width / 2; | ||
|
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| this.top = pos.top; | ||
| this.left = pos.left; | ||
|
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| //this.img.css(pos); | ||
| }; | ||
|
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| Cropper.prototype.setImageSrc = function (src, width, height) { | ||
| var img = this.img; | ||
|
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| this.src = src; | ||
|
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| // reset the image position and dimensions | ||
| img.css({ | ||
| width: '', | ||
| height: '', | ||
| top: 0, | ||
| left: 0 | ||
| }); | ||
|
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| this.slider.val(this.scale); | ||
|
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| img.attr('src', this.src); | ||
|
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| // initialize the center to the middle of the wrapper | ||
| this.yCenter = this._wrapperHeight / 2; | ||
| this.xCenter = this._wrapperWidth / 2; | ||
|
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| this._originalWidth = width; | ||
| this._originalHeight = height; | ||
|
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| this.isLandscape = this._originalHeight < this._originalWidth; | ||
|
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| this.resize(this.scale); | ||
| }; | ||
|
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| Cropper.prototype.updateSize = function (length) { | ||
| if (this.isLandscape) { | ||
| this._height = length; | ||
| this._width = length * this._originalWidth / this._originalHeight; | ||
| } else { | ||
| this._width = length; | ||
| this._height = length * this._originalHeight / this._originalWidth; | ||
| } | ||
| this.img.height(this._height); | ||
| this.img.width(this._width); | ||
| }; | ||
|
|
||
| Cropper.prototype.getBoundedPosition = function (top, left) { | ||
| var w = this._width; | ||
| var h = this._height; | ||
| var wh = this._wrapperHeight; | ||
| var ww = this._wrapperWidth; | ||
|
|
||
| // keep the left edge of the image within the crop zone | ||
| if (left > this.horizontalGutter) { | ||
| left = this.horizontalGutter; | ||
| } | ||
|
|
||
| // keep the right edge of the image within the crop zone | ||
| if (left + w < ww - this.horizontalGutter) { | ||
| left = ww - this.horizontalGutter - w; | ||
| } | ||
|
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||
| // keep the top edge of the image within the crop zone | ||
| if (top > this.verticalGutter) { | ||
| top = this.verticalGutter; | ||
| } | ||
|
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||
| // keep the bottom edge of the image within the crop zone | ||
| if (top + h < wh - this.verticalGutter) { | ||
| top = wh - this.verticalGutter - h; | ||
| } | ||
|
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| return { top: top, left: left }; | ||
| }; | ||
|
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| Cropper.prototype.resize = function resize(scale) { | ||
| if (scale < 0) { | ||
| scale = 0; | ||
| } | ||
| if (scale > 100) { | ||
| scale = 100; | ||
| } | ||
|
|
||
| var factor = 1 + scale / 100; | ||
| var length = this.DISPLAY_LENGTH * factor; | ||
| this.scale = scale; | ||
|
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| this.updateSize(length); | ||
|
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| var pos = this.getBoundedPosition(this.yCenter - this._height / 2, this.xCenter - this._width / 2); | ||
| this.updatePosition(pos); | ||
| this.img.css(pos); | ||
| }; | ||
|
|
||
| // Return new image data for the image rotated by a number of degrees | ||
| Cropper.prototype.rotate = function (degrees) { | ||
| var canvas = this.canvas; | ||
| var context = canvas.getContext('2d'); | ||
|
|
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| // Switch height and width to fit rotated image | ||
| canvas.width = this._originalHeight; | ||
| canvas.height = this._originalWidth; | ||
|
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| // move to the center of the canvas | ||
| context.translate(canvas.width / 2, canvas.height / 2); | ||
|
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| // rotate the canvas to the specified degrees | ||
| context.rotate(degrees * Math.PI / 180); | ||
|
|
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| // draw the image | ||
| // since the context is rotated, the image will be rotated also | ||
| context.drawImage(this.img[0], -this._originalWidth / 2, -this._originalHeight / 2); | ||
|
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| return canvas.toDataURL('image/png'); | ||
| }; | ||
|
|
||
| // Get the scaled position of the crop square over the source image | ||
| Cropper.prototype.cropPosition = function () { | ||
| var scale = this.isLandscape ? | ||
| this._originalHeight / this.DISPLAY_LENGTH : | ||
| this._originalWidth / this.DISPLAY_LENGTH; | ||
| var oscale = 1 + this.scale / 100; | ||
| var sourceLength = this.DISPLAY_LENGTH / oscale * scale; | ||
|
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| return { | ||
| left: (-this.left + this.horizontalGutter) / oscale * scale, | ||
| top: (-this.top + this.verticalGutter) / oscale * scale, | ||
| length: sourceLength | ||
| }; | ||
| }; | ||
|
|
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| // Get the final cropped image data | ||
| Cropper.prototype.getImageData = function (type, quality) { | ||
| var context = this.canvas.getContext('2d'); | ||
| var sourcePos = this.cropPosition(); | ||
| var destLength = this.EXPORT_LENGTH; | ||
|
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| this.canvas.width = destLength; | ||
| this.canvas.height = destLength; | ||
|
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|
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| context.drawImage( | ||
| this.img[0], | ||
| sourcePos.left, | ||
| sourcePos.top, | ||
| sourcePos.length, | ||
| sourcePos.length, | ||
| 0, 0, destLength, destLength | ||
| ); | ||
|
|
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| return this.canvas.toDataURL(type || 'image/png', quality); | ||
| }; | ||
|
|
||
| return Cropper; | ||
| }); | ||
|
|
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