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Filename : form-image-crop.js
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var FormImageCrop = function () {

    var demo1 = function() {
        $('#demo1').Jcrop();
    }

    var demo2 = function() {
        var jcrop_api;

        $('#demo2').Jcrop({
          onChange:   showCoords,
          onSelect:   showCoords,
          onRelease:  clearCoords
        },function(){
          jcrop_api = this;
        });

        $('#coords').on('change','input',function(e){
          var x1 = $('#x1').val(),
              x2 = $('#x2').val(),
              y1 = $('#y1').val(),
              y2 = $('#y2').val();
          jcrop_api.setSelect([x1,y1,x2,y2]);
        });

        // Simple event handler, called from onChange and onSelect
        // event handlers, as per the Jcrop invocation above
        function showCoords(c)
        {
            $('#x1').val(c.x);
            $('#y1').val(c.y);
            $('#x2').val(c.x2);
            $('#y2').val(c.y2);
            $('#w').val(c.w);
            $('#h').val(c.h);
        };

        function clearCoords()
        {
            $('#coords input').val('');
        };
    }

    var demo3 = function() {
        // Create variables (in this scope) to hold the API and image size
        var jcrop_api,
            boundx,
            boundy,
            // Grab some information about the preview pane
            $preview = $('#preview-pane'),
            $pcnt = $('#preview-pane .preview-container'),
            $pimg = $('#preview-pane .preview-container img'),

            xsize = $pcnt.width(),
            ysize = $pcnt.height();
        
            console.log('init',[xsize,ysize]);

        $('#demo3').Jcrop({
          onChange: updatePreview,
          onSelect: updatePreview,
          aspectRatio: xsize / ysize
        },function(){
          // Use the API to get the real image size
          var bounds = this.getBounds();
          boundx = bounds[0];
          boundy = bounds[1];
          // Store the API in the jcrop_api variable
          jcrop_api = this;
          // Move the preview into the jcrop container for css positioning
          $preview.appendTo(jcrop_api.ui.holder);
        });

        function updatePreview(c)
        {
          if (parseInt(c.w) > 0)
          {
            var rx = xsize / c.w;
            var ry = ysize / c.h;

            $pimg.css({
              width: Math.round(rx * boundx) + 'px',
              height: Math.round(ry * boundy) + 'px',
              marginLeft: '-' + Math.round(rx * c.x) + 'px',
              marginTop: '-' + Math.round(ry * c.y) + 'px'
            });
          }
        };
    }


    return {
        //main function to initiate the module
        init: function () {
            
            if (!jQuery().Jcrop) {;
                return;
            }

            demo1();
            demo2();
            demo3();
        }

    };

}();