Schools

“use strict”;

var positionImage = function positionImage(imageEl) {
var imageDimensions = imageEl.dataset.imageDimensions.split(‘x’);
var originalWidth = imageDimensions[0];
var originalHeight = imageDimensions[1];
var focalPoint = imageEl.dataset.imageFocalPoint.split(‘,’);
var focalPointX = focalPoint[0];
var focalPointY = focalPoint[1];
var parentNode = imageEl.parentNode;

var scale = function () {
var imageRatio = originalWidth / originalHeight;
var parentClientSize = {
height: parentNode.clientHeight,
width: parentNode.clientWidth
};
var parentRatio = parentClientSize.width / parentClientSize.height;

if (imageRatio > parentRatio) {
return parentClientSize.height / originalHeight;
}

return parentClientSize.width / originalWidth;
}();

var getRelativeOffset = function getRelativeOffset() {
var targetWidth = Math.ceil(originalWidth * scale);
var targetHeight = Math.ceil(originalHeight * scale);
var parentDimensionWidth = parentNode.offsetWidth;
var parentDimensionHeight = parentNode.offsetHeight;
var overflowWidth = targetWidth – parentDimensionWidth;
var overflowHeight = targetHeight – parentDimensionHeight;
var valueX;

if (overflowWidth === 0) {
valueX = focalPointX;
} else {
valueX = Math.max(Math.min(targetWidth * focalPointX – parentDimensionWidth * 0.5, overflowWidth), 0) / overflowWidth;
}

var valueY;

if (overflowHeight === 0) {
valueY = focalPointY;
} else {
valueY = Math.max(Math.min(targetHeight * focalPointY – parentDimensionHeight * 0.5, overflowHeight), 0) / overflowHeight;
}

return {
valueX: valueX,
valueY: valueY
};
};

var relativeOffset = getRelativeOffset();
var valueX = relativeOffset.valueX;
var valueY = relativeOffset.valueY;
imageEl.style.objectPosition = “”.concat(valueX * 100, “% “).concat(valueY * 100, “%”);
};

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