Create New Drawing Box With HTML CSS and JavaScript
now we code javascript for Drawing App. we use canvas in code so we can draw anything. we define size, color, linewidth so that
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="style.css" />
<title>Drawing App</title>
</head>
<body>
<canvas id="canvas" width="800" height="700"></canvas>
<div class="toolbox">
<button id="decrease">-</button>
<span id="size">10</span>
<button id="increase">+</button>
<input type="color" id="color">
<button id="clear">X</button>
</div>
<script src="script.js"></script>
</body>
</html>
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');
* {
box-sizing: border-box;
}
body {
background-color: #f5f5f5;
font-family: 'Roboto', sans-serif;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
height: 100vh;
margin: 0;
}
canvas {
border: 2px solid steelblue;
}
.toolbox {
background-color: steelblue;
border: 1px solid slateblue;
display: flex;
width: 804px;
padding: 1rem;
}
.toolbox > * {
background-color: #fff;
border: none;
display: inline-flex;
align-items: center;
justify-content: center;
font-size: 2rem;
height: 50px;
width: 50px;
margin: 0.25rem;
padding: 0.25rem;
cursor: pointer;
}
.toolbox > *:last-child {
margin-left: auto;
}
Javascript Source Code
const canvas = document.getElementById('canvas');
const increaseBtn = document.getElementById('increase');
const decreaseBtn = document.getElementById('decrease');
const sizeEL = document.getElementById('size');
const colorEl = document.getElementById('color');
const clearEl = document.getElementById('clear');
const ctx = canvas.getContext('2d');
let size = 10
let isPressed = false
colorEl.value = 'black'
let color = colorEl.value
let x
let y
canvas.addEventListener('mousedown', (e) => {
isPressed = true
x = e.offsetX
y = e.offsetY
})
document.addEventListener('mouseup', (e) => {
isPressed = false
x = undefined
y = undefined
})
canvas.addEventListener('mousemove', (e) => {
if(isPressed) {
const x2 = e.offsetX
const y2 = e.offsetY
drawCircle(x2, y2)
drawLine(x, y, x2, y2)
x = x2
y = y2
}
})
function drawCircle(x, y) {
ctx.beginPath();
ctx.arc(x, y, size, 0, Math.PI * 2)
ctx.fillStyle = color
ctx.fill()
}
function drawLine(x1, y1, x2, y2) {
ctx.beginPath()
ctx.moveTo(x1, y1)
ctx.lineTo(x2, y2)
ctx.strokeStyle = color
ctx.lineWidth = size * 2
ctx.stroke()
}
function updateSizeOnScreen() {
sizeEL.innerText = size
}
increaseBtn.addEventListener('click', () => {
size += 5
if(size > 50) {
size = 50
}
updateSizeOnScreen()
})
decreaseBtn.addEventListener('click', () => {
size -= 5
if(size < 5) {
size = 5
}
updateSizeOnScreen()
})
colorEl.addEventListener('change', (e) => color = e.target.value)
clearEl.addEventListener('click', () => ctx.clearRect(0,0, canvas.width, canvas.height))
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