Easy Image Editor: Tutorial and Documentation

 
Easy Image Editor
 
 
  
 Filters 
 Brightness Saturation Inversion Grayscale 
  
 
 
Brighteness
 
100%
 
  
 
  
 Rotate & Flip 
     
 
 
  
  
 
  
 Reset Filters 
  Choose Image Save Image 
 
 

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(".Easy Image Editor: Tutorial and Documentation 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());