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let isRunning = false;
let intervalId;
/**
* Check if the provided value is a valid hexadecimal.
* @param {String} value - Two hexadecimal symbols.
* @returns {Boolean} True if value is a valid hexadecimal ; false otherwise.
*/
function isValidHex(value) {
const hexSymbols = "0123456789ABCDEF";
const hexArray = value.split("");
if (hexArray.length !== 2) return false;
if (!hexSymbols.includes(hexArray[0].toUpperCase())) return false;
if (!hexSymbols.includes(hexArray[1].toUpperCase())) return false;
return true;
}
/**
* Print a message to notify user.
* @param {String} msg A message to print.
*/
function notify(msg) {
const body = document.querySelector(".body");
const notification = document.createElement("div");
notification.classList.add("notification");
notification.textContent = msg;
body.appendChild(notification);
setTimeout(() => {
notification.remove();
}, 3000);
}
/**
* Check if colors are set and are valid hexadecimal.
* @param {String} red - Hexadecimal string for red color.
* @param {String} green - Hexadecimal string for green color.
* @param {String} blue - Hexadecimal string for blue color.
* @returns {Boolean} True if colors are ready; false otherwise.
*/
function areColorsReady(red, green, blue) {
if (!red || !green || !blue) return false;
if (!isValidHex(red)) {
notify("Red is not hexadecimal.");
return false;
}
if (!isValidHex(green)) {
notify("Green is not hexadecimal.");
return false;
}
if (!isValidHex(blue)) {
notify("Blue is not hexadecimal.");
return false;
}
return true;
}
/**
* Update the preview color with the provided color.
* @param {String} color - Hexadecimal string with a leading hash (CSS format).
*/
function updatePreviewColor(color) {
const preview = document.querySelector(".preview");
preview.style.backgroundColor = color;
}
/**
* Initialize the preview with user settings.
* @param {Object} ui - The different element corresponding to the user interface.
*/
function setPreview(ui) {
const red = ui.colors.red.value;
const green = ui.colors.green.value;
const blue = ui.colors.blue.value;
if (areColorsReady(red, green, blue)) {
const currentColor = `#${red}${green}${blue}`;
updatePreviewColor(currentColor);
}
}
/**
* Generate a new color.
* @param {Integer} color - An integer corresponding to a RGB value.
* @param {Integer} increment - Add this value to color argument.
*/
function* getColor(color, increment) {
let nextColor = color;
yield nextColor;
while (true) {
if (nextColor + increment > 255) {
nextColor = nextColor - 255 + increment;
} else {
nextColor = nextColor + increment;
}
yield nextColor;
}
}
/**
* Convert an RGB color to hexadecimal format.
* @param {Integer} red - An integer representing red color with RGB format.
* @param {Integer} green - An integer representing green color with RGB format.
* @param {Integer} blue - A value representing blue color with RGB format.
* @returns {String} The color in hexadecimal format with a leading hash.
*/
function getNexHexColor(red, green, blue) {
return `#${red.toString(16)}${green.toString(16)}${blue.toString(16)}`;
}
/**
* Disable or enable inputs.
* @param {Object} ui - The HTMLElements corresponding to user interface.
*/
function toggleInputs(ui) {
ui.colors.red.disabled = isRunning;
ui.colors.green.disabled = isRunning;
ui.colors.blue.disabled = isRunning;
ui.increments.red.disabled = isRunning;
ui.increments.green.disabled = isRunning;
ui.increments.blue.disabled = isRunning;
ui.interval.disabled = isRunning;
}
/**
* Start or stop the preview.
* @param {Object} ui - The HTMLElements corresponding to user interface.
*/
function start(ui) {
const red = ui.colors.red.value;
const green = ui.colors.green.value;
const blue = ui.colors.blue.value;
if (areColorsReady(red, green, blue)) {
isRunning = !isRunning;
ui.button.textContent = isRunning ? "Stop" : "Start";
} else {
notify("Colors are not correctly set.");
}
const redIncrement = Number(ui.increments.red.value);
const greenIncrement = Number(ui.increments.green.value);
const blueIncrement = Number(ui.increments.blue.value);
const redGenerator = getColor(parseInt(red, 16), redIncrement);
const greenGenerator = getColor(parseInt(green, 16), greenIncrement);
const blueGenerator = getColor(parseInt(blue, 16), blueIncrement);
const timing = ui.interval.value;
if (isRunning) {
toggleInputs(ui);
intervalId = setInterval(() => {
const nextRed = redGenerator.next().value;
const nextGreen = greenGenerator.next().value;
const nextBlue = blueGenerator.next().value;
const newColor = getNexHexColor(nextRed, nextGreen, nextBlue);
updatePreviewColor(newColor);
}, timing);
} else {
toggleInputs(ui);
clearInterval(intervalId);
}
}
/**
* Listen form, buttons and inputs.
* @param {Object} ui - The HTMLElements corresponding to user interface.
*/
function listen(ui) {
ui.form.addEventListener("submit", (e) => {
e.preventDefault();
});
ui.button.addEventListener("click", () => start(ui));
ui.colors.red.addEventListener("change", () => setPreview(ui));
ui.colors.green.addEventListener("change", () => setPreview(ui));
ui.colors.blue.addEventListener("change", () => setPreview(ui));
}
/**
* Initialize the app.
*/
function init() {
const ui = {
button: document.querySelector(".btn"),
form: document.querySelector(".form"),
colors: {
red: document.getElementById("color-red"),
green: document.getElementById("color-green"),
blue: document.getElementById("color-blue"),
},
increments: {
red: document.getElementById("increment-red"),
green: document.getElementById("increment-green"),
blue: document.getElementById("increment-blue"),
},
interval: document.getElementById("time-interval"),
};
setPreview(ui);
listen(ui);
}
init();
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