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app.js
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app.js
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const canvas = document.getElementById("jsCanvas");
const ctx = canvas.getContext("2d");
const colors = document.getElementsByClassName("jsColor");
const range = document.getElementById("jsRange");
const mode = document.getElementById("jsMode");
const save = document.getElementById("jsSave");
CANVAS_SIZE = 500;
ctx.lineWidth = 3;
canvas.width = CANVAS_SIZE;
canvas.height = CANVAS_SIZE;
ctx.fillStyle = "white";
ctx.fillRect(0, 0, CANVAS_SIZE, CANVAS_SIZE);
let filling = false;
let painting = false;
function onMouseMove(event) {
const x = event.offsetX;
const y = event.offsetY;
if (!painting) {
ctx.beginPath();
ctx.moveTo(x, y);
} else {
ctx.lineTo(x, y);
ctx.stroke();
}
}
function startPainting() {
painting = true;
}
function onMouseDown(event) {
painting = true;
}
function stopPainting() {
painting = false;
}
function handColorClick(event) {
const color = event.target.style.backgroundColor;
ctx.fillStyle = color;
ctx.strokeStyle = color;
}
function handRangeChange(event) {
const size = event.target.value;
ctx.lineWidth = size;
}
function handelModeClick() {
if (filling == true) {
filling = false;
mode.innerText = "Fill";
} else {
filling = true;
mode.innerText = "Paint";
}
}
function handelCanvasClick() {
if (filling) {
ctx.fillRect(0, 0, CANVAS_SIZE, CANVAS_SIZE);
}
}
function handleSaveClick() {
const image = canvas.toDataURL("image/png");
const link = document.createElement("a");
link.href = image;
link.download = "PaintJS";
link.click();
}
if (canvas) {
canvas.addEventListener("mousemove", onMouseMove);
canvas.addEventListener("mousedown", startPainting);
canvas.addEventListener("mouseup", stopPainting);
canvas.addEventListener("mouseleave", stopPainting);
canvas.addEventListener("click", handelCanvasClick);
canvas.addEventListener("contextmenu", (event) => event.preventDefault());
}
if (colors) {
Array.from(colors).forEach((color) =>
color.addEventListener("click", handColorClick)
);
}
if (range) {
range.addEventListener("input", handRangeChange);
}
if (mode) {
mode.addEventListener("click", handelModeClick);
}
if (save) {
save.addEventListener("click", handleSaveClick);
}