JSFiddle - React, Tailwind, and code Playground

by codingdude

HTML

<canvas id="myCanvas" width="400" height="300" style="border: 1px solid black"></canvas>
<br />
<label>Choose a File:</label>
<br/>
<br />
<input type="file" id="imageLoader" name="imageLoader" />
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>

JavaScript

$(document).ready(function() {
    var imageLoader = document.getElementById('imageLoader');
    imageLoader.addEventListener('change', handleImage, false);
});

var canvas = new fabric.Canvas('myCanvas');

var clippingRect = new fabric.Rect({
    left: 100,
    top: 100,
    width: 100,
    height: 100,
    fill: 'transparent',
    opacity: 1,
    objectCaching:false
});
canvas.add(clippingRect);

function handleImage(e) {
    var reader = new FileReader();
    reader.onload = function(event) {
        var img = new Image();
        img.onload = function() {

            var instanceWidth, instanceHeight;

            instanceWidth = img.width;
            instanceHeight = img.height;

            var imgInstance = new fabric.Image(img, {
                width: instanceWidth,
                height: instanceHeight,
                top: (canvas.getHeight() / 2 - instanceHeight / 2),
                left: (canvas.getWidth() / 2 - instanceWidth / 2),
                originX: 'left',
                originY: 'top'
            });
            canvas.add(imgInstance);
            imgInstance.clipTo = function(ctx) {
                ctx.save();
                ctx.setTransform(1, 0, 0, 1, 0, 0);
                
                clippingRect.render(ctx);
                
                ctx.restore();
            };
            canvas.renderAll();
        };
        img.src = event.target.result;
    };
    reader.readAsDataURL(e.target.files[0]);
}