jQuery imgAreaSelect使用宽高比设置初始选择 [英] jQuery imgAreaSelect set initial selection with aspect ratio

问题描述

我正在使用jQuery和imgAreaSelect插件.我正在使用区域选择插件，以便用户可以在上传之前将其图片裁剪为16:9的宽高比.

I'm using jQuery and the imgAreaSelect plugin. I am using the area select plugin so that users can crop their images to 16:9 aspect ratio before they upload.

我想显示一个初始的裁切选择，以便当他们选择文件时，将加载缩略图，并使用imgAreaSelect选择最大的16:9选择.我有缩略图加载等，但无法获得宽高比部分.这是我到目前为止的内容:

I want to display an initial crop selection so that when they select the file, a thumbnail loads and the biggest possible 16:9 selection is selected with imgAreaSelect. I have the thumbnail loading etc but just cant get the aspect ratio part. This is what I have so far:

    // adds an image area select instance
    function addImgAreaSelect( img ){
            img.addClass( 'imgAreaSelect' ).imgAreaSelect({
                    handles : true,
                    aspectRatio : '16:9',
                    fadeSpeed : 1,
                    show : true
            });
            img.load(function(){ // set initial crop at 16:9 aspect ratio, calculate coordinates
                    // @todo
                    $( this ).imgAreaSelect({ x1 : 0, y1 : 0, x2 : this.width, y2 : this.height });

   });
}

任何对此的帮助，我们将不胜感激！谢谢

Any help with this is appreciated! Thanks

推荐答案

这对我有用:

// adds an image area select instance
function addImgAreaSelect( img ){
        img.addClass( 'imgAreaSelect' ).imgAreaSelect({
                handles : true,
                aspectRatio : '16:9',
                fadeSpeed : 1,
                show : true
        });
        img.load(function(){ // display initial image selection 16:9
                    var height = ( this.width / 16 ) * 9;
                    if( height <= this.height ){     
                            var diff = ( this.height - height ) / 2;
                            var coords = { x1 : 0, y1 : diff, x2 : this.width, y2 : height + diff };
                    }   
                    else{ // if new height out of bounds, scale width instead
                            var width = ( this.height / 9 ) * 16; 
                            var diff = ( this.width - width ) / 2;
                            var coords = { x1 : diff, y1 : 0, x2 : width + diff, y2: this.height };
                    }   
                $( this ).imgAreaSelect( coords );
        });
}

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