回答編集履歴
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補足依頼欄に合わせて追記
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[https://www.jqueryscript.net/demo/smooth-pan-zoom-alotta/](https://www.jqueryscript.net/demo/smooth-pan-zoom-alotta/)
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[https://www.npmjs.com/package/react-image-zoom-pan](https://www.npmjs.com/package/react-image-zoom-pan)
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[https://www.cssscript.com/demo/vanilla-js-library-for-image-zoom-and-pan/](https://www.cssscript.com/demo/vanilla-js-library-for-image-zoom-and-pan/)
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[https://www.cssscript.com/demo/image-pan-lc-mouse-drag/](https://www.cssscript.com/demo/image-pan-lc-mouse-drag/)
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[https://www.cssscript.com/demo/image-pan-lc-mouse-drag/](https://www.cssscript.com/demo/image-pan-lc-mouse-drag/)
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---
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# 補足依頼欄に合わせて追記
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サンプル置いておきます。
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[https://jsfiddle.net/Lhankor_Mhy/jw91yx3p/](https://jsfiddle.net/Lhankor_Mhy/jw91yx3p/)
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```js
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$.fn.ImageExpansion = function (options) {
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var target = $(this);
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var settings = $.extend({
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'pan': 2,
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'drag': 100
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}, options);
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/*
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* 初期設定
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*/
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var setImage = function (obj) {
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//画像のSRC取得
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var src = $("img", target).attr('src');
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//右の枠の大きさ ドラッグ枠の数値 * 倍率
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var hw = settings.drag * settings.pan;
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$(".pan_image", target).css({ 'width': hw, 'height': hw });
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//右の枠へ背景画像を設定
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$(".pan_image", target).css({ 'background-image': 'url(' + src + ')' });
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//左の画像の幅を倍率で割り、max-widthに指定する幅を得る
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var img_w = $("img", target).width();
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img_w = Math.floor(img_w / settings.pan);
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var img_h = $("img", target).height();
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img_h = Math.floor(img_h / settings.pan);
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//左の枠の幅を上で計算した幅と高さに設定
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$(target).css({ 'width': img_w, 'height': img_h });
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//左の画像を上で計算した幅と高さに設定
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$("img", target).css({ 'max-width': img_w, 'height': img_h });
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//ドラッグ枠の大きさを設定
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$(".pan_mouse", target).css({ 'width': settings.drag, 'height': settings.drag });
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};
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/*
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* ドラッグ
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*/
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$(".pan_mouse", target).draggable({
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containment: "parent"
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});
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/*
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* ドラッグした距離で背景画像の位置を変更
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*/
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$(".pan_mouse", target).on('mousemove', function (e) {
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//image_expansion ウインド上の位置
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var div = $(target).offset();
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var ex_left = Math.floor(div.left);
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var ex_top = Math.floor(div.top);
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//pan_mouse ウインド上の位置
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var div = $('.pan_mouse', target).offset();
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var pan_left = Math.floor(div.left);
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var pan_top = Math.floor(div.top);
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//image_expansion内におけるpan_mouseの上下位置差分
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var left = (pan_left - ex_left) * settings.pan;
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var top = (pan_top - ex_top) * settings.pan;
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$(".pan_image", target).css({ 'background-position': '-' + left + 'px -' + top + 'px' });
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});
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return setImage($(this));
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};
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```
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ついでに、適当にググってみた結果を貼っておきます。
answer
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@@ -1,4 +1,21 @@
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いっそ、Leaflet.js とかはどうですか？
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[Leaflet.jsを使って任意の画像の拡縮を行いたい - Qiita](https://qiita.com/yuskesuzki@github/items/5fd2fcb52729061da33c)
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[leaflet js 画像拡大 - Google 検索](https://www.google.com/search?q=leaflet+js+画像拡大)
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[leaflet js 画像拡大 - Google 検索](https://www.google.com/search?q=leaflet+js+画像拡大)
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---
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ついでに、適当にググってみた結果を貼っておきます。
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[https://www.jqueryscript.net/demo/Simple-jQuery-Image-Crop-Zoom-Plugin-ZoomCrop/](https://www.jqueryscript.net/demo/Simple-jQuery-Image-Crop-Zoom-Plugin-ZoomCrop/)
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[https://www.jqueryscript.net/demo/jQuery-Plugin-To-Pan-An-Image-In-A-Container-simplePan/](https://www.jqueryscript.net/demo/jQuery-Plugin-To-Pan-An-Image-In-A-Container-simplePan/)
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[https://www.jqueryscript.net/demo/Customizable-jQuery-Image-Zoom-Pan-Plugin-panzoom/](https://www.jqueryscript.net/demo/Customizable-jQuery-Image-Zoom-Pan-Plugin-panzoom/)
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[https://www.jqueryscript.net/demo/Simple-jQuery-Image-Zoom-With-Mouse-Wheel-or-Touch-Scroll/](https://www.jqueryscript.net/demo/Simple-jQuery-Image-Zoom-With-Mouse-Wheel-or-Touch-Scroll/)
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[https://www.jqueryscript.net/demo/SVG-Zooming-Panning-Plugin-jQuery-SvgZoom/](https://www.jqueryscript.net/demo/SVG-Zooming-Panning-Plugin-jQuery-SvgZoom/)
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[https://www.jqueryscript.net/demo/Touch-enabled-Image-Zooming-Panning-Plugin-jQuery-imgViewer2/](https://www.jqueryscript.net/demo/Touch-enabled-Image-Zooming-Panning-Plugin-jQuery-imgViewer2/)
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[https://www.jqueryscript.net/demo/Simple-Image-Viewer-jQuery/](https://www.jqueryscript.net/demo/Simple-Image-Viewer-jQuery/)
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[https://www.jqueryscript.net/demo/zoom-wheel-pan-drag-image/](https://www.jqueryscript.net/demo/zoom-wheel-pan-drag-image/)
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[https://www.jqueryscript.net/demo/smooth-pan-zoom-alotta/](https://www.jqueryscript.net/demo/smooth-pan-zoom-alotta/)
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[https://www.npmjs.com/package/react-image-zoom-pan](https://www.npmjs.com/package/react-image-zoom-pan)
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[https://www.cssscript.com/demo/vanilla-js-library-for-image-zoom-and-pan/](https://www.cssscript.com/demo/vanilla-js-library-for-image-zoom-and-pan/)
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[https://www.cssscript.com/demo/image-pan-lc-mouse-drag/](https://www.cssscript.com/demo/image-pan-lc-mouse-drag/)
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