Created
October 18, 2020 22:47
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show pixels values where mouse is hovering: https://yangcha.github.io/ImageViewer/
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| <!DOCTYPE HTML> | |
| <!-- Display image, show mouse position and pixel values | |
| Author: Changjiang Yang | |
| Date: 08/14/2016 | |
| TODO: Add drag and drop | |
| source: https://yangcha.github.io/ImageViewer/ | |
| --> | |
| <html> | |
| <head> | |
| <style> | |
| div.footer { | |
| position: fixed; | |
| bottom: 0; | |
| left: 0; | |
| margin: 0 auto; | |
| background: #0072BB; | |
| color:#fff; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <p>Open image: <input type="file" id="inputImage"/></p> | |
| <canvas id="canvas" style="margin:12px;"></canvas> | |
| <div class="footer" id="results">Move mouse over image to show mouse location and pixel value and alpha</div> | |
| <script> | |
| var URL = window.URL; | |
| var cvs = document.getElementById('canvas'); | |
| var ctx = cvs.getContext('2d'); | |
| var res = document.getElementById('results'); | |
| cvs.addEventListener('mousemove', mousePos, false); | |
| window.onload = function() { | |
| var inputImage = document.getElementById('inputImage'); | |
| inputImage.addEventListener('change', handleImageFiles, false); | |
| } | |
| function mousePos(evt) { | |
| var rect = cvs.getBoundingClientRect(); | |
| var x = parseInt(evt.clientX - rect.left); | |
| var y = parseInt(evt.clientY - rect.top); | |
| var p = ctx.getImageData(x, y, 1, 1).data; | |
| results.innerHTML = '<table style="width:100%;table-layout:fixed"><td>X: ' | |
| + x + '</td><td>Y: ' + y + '</td><td>Red: ' | |
| + p[0] + '</td><td>Green: ' + p[1] + '</td><td>Blue: ' | |
| + p[2] + '</td><td>Alpha: ' + p[3]+"</td></table>"; | |
| return {x, y}; | |
| } | |
| function handleImageFiles(e) { | |
| var url = URL.createObjectURL(e.target.files[0]); | |
| var img = new Image(); | |
| img.onload = function() { | |
| cvs.width = img.width; | |
| cvs.height = img.height; | |
| ctx.drawImage(img, 0, 0); | |
| } | |
| img.src = url; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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