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script.js
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script.js
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const fileInput = document.querySelector(".file-input"),
previewImg = document.querySelector(".preview__img"),
resetBtn = document.querySelector(".reset-btn"),
chooseBtn = document.querySelector(".choose-btn"),
allFilterBtn = document.querySelectorAll(".filter__options button"),
allRotateAndFlipBtn = document.querySelectorAll(".rotate__options button"),
filterLable = document.querySelector(".filter__info p"),
filterValue = document.querySelector(".filter__info p:nth-child(2)"),
filterSlider = document.querySelector(".filter__slider input"),
saveBtn = document.querySelector(".save-btn");
let brightness="100", saturation="100", inversion="0", grayscale="0";
let rotate = 0, flipHorizontal = 1, flipVertical = 1;
chooseBtn.addEventListener("click", () => fileInput.click());
fileInput.addEventListener("change", loadImage);
allFilterBtn.forEach(btn => btn.addEventListener("click",updateFilter));
filterSlider.addEventListener("input", updateSliderValue);
allRotateAndFlipBtn.forEach(btn => btn.addEventListener("click",updateRotationAndFlip));
resetBtn.addEventListener("click", resetValues);
saveBtn.addEventListener("click", saveImage);
function loadImage(){
// getting user selected file
let file = fileInput.files[0]
if(file){
const fileUrl = URL.createObjectURL(file)
previewImg.src = fileUrl
previewImg.addEventListener("load", ()=>{
// reset default value
resetBtn.click()
// activate the editor panel on Image load
const container = document.querySelector(".container")
container.classList.remove("disable")
})
}
}
function updateFilter(e){
// remove active button
const activeBtn = document.querySelector(".active");
activeBtn.classList.remove("active");
// update the clicked button as active
e.target.classList.add("active");
// change the filter lable as per the clicked button
filterLable.innerText = e.target.innerText;
// update slide value on different button selection
if(e.target.id == "brightness"){
filterSlider.max = "200";
filterSlider.value = brightness;
filterValue.innerText = `${brightness}%`;
} else if(e.target.id == "saturation"){
filterSlider.max = "200";
filterSlider.value = saturation;
filterValue.innerText = `${saturation}%`
} else if(e.target.id == "inversion"){
filterSlider.max = "100";
filterSlider.value = inversion;
filterValue.innerText = `${inversion}%`
} else if(e.target.id == "grayscale"){
filterSlider.max = "100";
filterSlider.value = grayscale
filterValue.innerText = `${grayscale}%`
}
}
function updateSliderValue(e){
// Update display value for each slide input
filterValue.innerText = `${e.target.value}%`
// Update filter value when slider input changes for the selected button
const activeBtn = document.querySelector(".filter .active")
if(activeBtn.id == "brightness"){
brightness = e.target.value;
} else if(activeBtn.id == "saturation"){
saturation = e.target.value;
} else if(activeBtn.id == "inversion"){
inversion = e.target.value;
} else if(activeBtn.id == "grayscale"){
grayscale = e.target.value;
}
applyFilter()
}
function updateRotationAndFlip(e){
// console.log(e.target)
if(e.target.id == "rotate-right"){
rotate += 90;
} else if(e.target.id == "rotate-left"){
rotate -= 90;
} else if(e.target.id == "flip-horizontal"){
flipHorizontal = flipHorizontal === 1 ? -1 : 1;
} else{
flipVertical = flipVertical === 1 ? -1 : 1;
}
applyFilter();
}
function applyFilter(){
previewImg.style.filter = `brightness(${brightness}%) saturate(${saturation}%) invert(${inversion}%) grayscale(${grayscale}%)`;
previewImg.style.transform = `rotate(${rotate}deg) scale(${flipVertical}, ${flipHorizontal})`;
}
function resetValues(){
// reset default values
brightness = 100;
saturation = 100;
inversion = 0;
grayscale = 0;
rotate = 0;
flipHorizontal = 1;
flipVertical = 1;
// apply above default values
allFilterBtn[0].click();
applyFilter();
}
function saveImage(){
// create a canvas
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
canvas.width = previewImg.naturalWidth;
canvas.height = previewImg.naturalHeight;
// apply filter, rotate & flip
ctx.filter = `brightness(${brightness}%) saturate(${saturation}%) invert(${inversion}%) grayscale(${grayscale}%)`;
ctx.scale(flipHorizontal, flipVertical);
if(rotate !== 0){
ctx.rotate(rotate * Math.PI / 180);
}
ctx.transform(canvas.width/2, canvas.height/2);
// create image
ctx.drawImage(previewImg, -canvas.width/2, canvas.height/2, canvas.width, canvas.height);
// create a anchor tag having the link of the newly created image
const link = document.createElement("a")
link.download = "new-image.jpg"
link.href = canvas.toDataURL();
// download image
link.click();
}