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etch-a-sketch.js
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etch-a-sketch.js
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let gridSize = 16;
const canvas = document.querySelector("#canvas");
const btn = document.querySelector("#change-size-btn");
btn.addEventListener("click", changeGridSize);
const resetCanvasBtn = document.querySelector("#reset-canvas-btn");
resetCanvasBtn.addEventListener("click", () => {
while (canvas.firstChild) {
canvas.removeChild(canvas.firstChild);
}
drawCanvas();
})
const span = document.querySelector("#number-squares");
drawCanvas();
function drawCanvas() {
let row;
let square;
for (let i=0; i<gridSize; i++) {
row = document.createElement("div");
row.classList.add("row");
canvas.appendChild(row);
for (let j=0; j<gridSize; j++) {
square = document.createElement("div");
square.classList.add("square");
square.style.backgroundColor = "white";
row.appendChild(square);
square.addEventListener("mousedown", paintSquare);
square.addEventListener("mouseover", paintSquare);
}
}
}
function paintSquare(e) {
if (e.buttons) {
if (e.target.style.backgroundColor === "white") {
e.target.style.backgroundColor = "black";
e.target.style.opacity = 0.1;
} else {
if (e.target.style.opacity < 1) e.target.style.opacity = parseFloat(e.target.style.opacity) + 0.1;
}
}
}
function changeGridSize () {
const newGridSize = parseInt(prompt("Choose grid size: "));
if (newGridSize <= 100) {
gridSize = newGridSize;
span.textContent = gridSize;
while (canvas.firstChild) {
canvas.removeChild(canvas.firstChild);
}
drawCanvas();
} else {
alert ("max value = 100");
}
}