Sizing the zoom ratio

gistfile1.js

    var sizeZoomRatio = function (gallery) {

        var zoomBodyNode = gallery.one('.zoomBody');
        var zoomBodyRatioNode = zoomBodyNode.one('.zoomBoundaryRatio');

        zoomBodyRatioNode.addClass('nudging');

        var imgWidth  = Y.Util.getClassValue(zoomBodyRatioNode, 'imgW');
        var imgHeight = Y.Util.getClassValue(zoomBodyRatioNode, 'imgH');

        if (imgWidth == '' || imgHeight == '') {
            // Most likely haven't got an image loaded into the zoom yet
            return;
        }

        var wrapWidth  = zoomBodyNode.get('offsetWidth');
        var wrapHeight = zoomBodyNode.get('offsetHeight');

        var targetDimensions = getImageDimensionsToFitContainer(imgWidth, imgHeight, wrapWidth, wrapHeight);

        // Set ratio container to correct size
        zoomBodyRatioNode.setStyles({
            'width':  targetDimensions.width + 'px',
            'height': targetDimensions.height + 'px'
        });
        zoomBodyRatioNode.removeClass('nudging');
    }

    // This should look familiar from the photo sizing in Part 2
    var getImageDimensionsToFitContainer = function (imgWidth, imgHeight, wrapWidth, wrapHeight) {

        var targetImgHeight = imgHeight;
        var targetImgWidth  = imgWidth;

        var verticalScalingFactor = (wrapHeight/imgHeight);

        // Scale
        if ((imgWidth*verticalScalingFactor) <= wrapWidth) {
            // Height is the limiting dimension
            targetImgWidth = Math.round(imgWidth * verticalScalingFactor);
            targetImgHeight = wrapHeight;
            Y.log("Fitting vertically, scale=" + verticalScalingFactor + ". W=" + targetImgWidth + " H=" + targetImgHeight);
        }
        else if ((imgWidth*verticalScalingFactor) > wrapWidth) {
            var horizontalScalingFactor = (wrapWidth/imgWidth);
            // Width is the limiting dimension
            targetImgWidth = wrapWidth;
            targetImgHeight = Math.round(imgHeight * horizontalScalingFactor);
            Y.log("Fitting horizontally, scale=" + horizontalScalingFactor + ". W=" + targetImgWidth + " H=" + targetImgHeight);
        }

        return {
            width: targetImgWidth,
            height: targetImgHeight
        };
    }