今天,我体验了一个使用 HTML、CSS 和 JavaScript 构建的简单但功能强大的图像编辑器的实现和功能。该编辑器允许用户应用基本滤镜、旋转和翻转图像。它还支持从用户设备加载图像并保存编辑后的图像。
HTML 结构分为几个关键部分:过滤器选项、旋转和翻转选项、图像预览区域和控制按钮。
<div class="container disable"> <h2>Easy Image Editor</h2> <div class="wrapper"> <div class="editor-panel"> <!-- Filters Section --> <div class="filter"> <label class="title">Filters</label> <div class="options"> <button id="brightness" class="active">Brightness</button> <button id="saturation">Saturation</button> <button id="inversion">Inversion</button> <button id="grayscale">Grayscale</button> </div> <!-- Slider for Filter Adjustments --> <div class="slider"> <div class="filter-info"> <p class="name">Brighteness</p> <p class="value">100%</p> </div> <input type="range" value="100" min="0" max="200"> </div> </div> <!-- Rotate & Flip Section --> <div class="rotate"> <label class="title">Rotate & Flip</label> <div class="options"> <button id="left"><i class="fa-solid fa-rotate-left"></i></button> <button id="right"><i class="fa-solid fa-rotate-right"></i></button> <button id="horizontal"><i class="bx bx-reflect-vertical"></i></button> <button id="vertical"><i class="bx bx-reflect-horizontal"></i></button> </div> </div> </div> <!-- Image Preview Section --> <div class="简易图像编辑器:教程和文档"> <img src="image-placeholder.svg" alt="简易图像编辑器:教程和文档"> </div> </div> <!-- Controls Section --> <div class="controls"> <button class="reset-filter">Reset Filters</button> <div class="row"> <input type="file" class="file-input" accept="image/*" hidden> <button class="choose-img">Choose Image</button> <button class="save-img">Save Image</button> </div> </div> </div>
JavaScript 代码处理加载图像、应用滤镜、旋转和翻转图像以及保存编辑后的图像背后的逻辑。
const fileInput = document.querySelector(".file-input"), filterOptions = document.querySelectorAll(".filter button"), filterName = document.querySelector(".filter-info .name"), filterValue = document.querySelector(".filter-info .value"), filterSlider = document.querySelector(".slider input"), rotateOptions = document.querySelectorAll(".rotate button"), previewImg = document.querySelector(".简易图像编辑器:教程和文档 img"), resetFilterBtn = document.querySelector(".reset-filter"), chooseImgBtn = document.querySelector(".choose-img"), saveImgBtn = document.querySelector(".save-img"); let brightness = "100", saturation = "100", inversion = "0", grayscale = "0"; let rotate = 0, flipHorizontal = 1, flipVertical = 1;
const loadImage = () => { let file = fileInput.files[0]; if(!file) return; previewImg.src = URL.createObjectURL(file); previewImg.addEventListener("load", () => { resetFilterBtn.click(); // Reset filters when a new image is loaded document.querySelector(".container").classList.remove("disable"); }); }
const applyFilter = () => { previewImg.style.transform = `rotate(${rotate}deg) scale(${flipHorizontal}, ${flipVertical})`; previewImg.style.filter = `brightness(${brightness}%) saturate(${saturation}%) invert(${inversion}%) grayscale(${grayscale}%)`; }
filterOptions.forEach(option => { option.addEventListener("click", () => { document.querySelector(".active").classList.remove("active"); option.classList.add("active"); filterName.innerText = option.innerText; if(option.id === "brightness") { filterSlider.max = "200"; filterSlider.value = brightness; filterValue.innerText = `${brightness}%`; } else if(option.id === "saturation") { filterSlider.max = "200"; filterSlider.value = saturation; filterValue.innerText = `${saturation}%` } else if(option.id === "inversion") { filterSlider.max = "100"; filterSlider.value = inversion; filterValue.innerText = `${inversion}%`; } else { filterSlider.max = "100"; filterSlider.value = grayscale; filterValue.innerText = `${grayscale}%`; } }); }); const updateFilter = () => { filterValue.innerText = `${filterSlider.value}%`; const selectedFilter = document.querySelector(".filter .active"); if(selectedFilter.id === "brightness") { brightness = filterSlider.value; } else if(selectedFilter.id === "saturation") { saturation = filterSlider.value; } else if(selectedFilter.id === "inversion") { inversion = filterSlider.value; } else { grayscale = filterSlider.value; } applyFilter(); }
rotateOptions.forEach(option => { option.addEventListener("click", () => { if(option.id === "left") { rotate -= 90; } else if(option.id === "right") { rotate += 90; } else if(option.id === "horizontal") { flipHorizontal = flipHorizontal === 1 ? -1 : 1; } else { flipVertical = flipVertical === 1 ? -1 : 1; } applyFilter(); }); });
const resetFilter = () => { brightness = "100"; saturation = "100"; inversion = "0"; grayscale = "0"; rotate = 0; flipHorizontal = 1; flipVertical = 1; filterOptions[0].click(); applyFilter(); }
const saveImage = () => { const canvas = document.createElement("canvas"); const ctx = canvas.getContext("2d"); canvas.width = previewImg.naturalWidth; canvas.height = previewImg.naturalHeight; ctx.filter = `brightness(${brightness}%) saturate(${saturation}%) invert(${inversion}%) grayscale(${grayscale}%)`; ctx.translate(canvas.width / 2, canvas.height / 2); if(rotate !== 0) { ctx.rotate(rotate * Math.PI / 180); } ctx.scale(flipHorizontal, flipVertical); ctx.drawImage(previewImg, -canvas.width / 2, -canvas.height / 2, canvas.width, canvas.height); const link = document.createElement("a"); link.download = "image.jpg"; link.href = canvas.toDataURL(); link.click(); }
filterSlider.addEventListener("input", updateFilter); resetFilterBtn.addEventListener("click", resetFilter); saveImgBtn.addEventListener("click", saveImage); fileInput.addEventListener("change", loadImage); chooseImgBtn.addEventListener("click", () => fileInput.click());
滑块。
这个简单的图像编辑器提供了修改和增强图像的基本工具。该结构被设计为易于理解和可扩展,允许添加更多功能,例如附加过滤器或高级编辑工具。感谢您的阅读。进入下一个…
在这里查看
https://app.marvelly.com.ng/100daysofMiva/day-5/
源代码
https://github.com/Marvellye/100daysofMiva/tree/main/Projects/Day_5-Image-Editor
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