PaintProject/index.html at main · AahanGhode/PaintProject · GitHub

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<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title></title>
	<style>
		.buttonCSS{
			position: absolute;
			top: 80px;
			border: solid black 2px;
			padding: 50px;
			border-radius: 100%;
		}
		canvas{
			background-color: yellow;
			position: absolute;
			top: 220px;
			left: 375px;
		}
	</style>
</head>
<body style='background-image: url("https://cdn.pixabay.com/photo/2021/02/24/20/53/abstract-6047465_1280.jpg"); background-size: cover;'>

<button onclick="chooseColour('green')" style="background-color: green; left: 330px;" class="buttonCSS"></button>

<button onclick="chooseColour('blue')" style="background-color: blue; left: 440px;" class="buttonCSS"></button>

<button onclick="chooseColour('red')" style="background-color: red; left:550px;" class="buttonCSS"></button>

<button onclick="chooseColour('purple')" style="background-color: purple; left:660px;" class="buttonCSS"></button>

<button onclick="chooseColour('orange')" style="background-color: orange; left: 770px;" class="buttonCSS"></button>

<button onclick="chooseColour('black')" style="background-color: black; left: 880px;" class="buttonCSS"></button>

<button onclick="chooseColour('yellow')" style="background-color: grey; left: 1050px; color: white; font-size: 15px; border-radius: 5%;" class="buttonCSS">Eraser</button>

<button onclick="setSize()" style="position: absolute; left: 1230px; top: 80px; background-color: grey; border-radius: 5%; font-size: 15px; color: white;" class="buttonCSS">Choose size</button>

<canvas id="canvas" onmousedown="funcMouseDown(event)" onmousemove="funcMouseMove(event)" onmouseup="funcMouseUp(event)" width="1050" height="600"></canvas>

<button onclick="clearCanvas()" style="position: relative; left: 850px; top: 820px; background-color: grey; border-radius: 5%; font-size: 15px; color: white;" class="buttonCSS">Clear</button>
<script>
	isMouseDown = false;
	var previousX;
	var previousY;

	var c = document.getElementById("canvas");
	var ctx = c.getContext("2d");

	ctx.strokeStyle = "black";
	ctx.lineWidth = 5;
	function funcMouseDown(event){
		isMouseDown = true;
		previousX = event.offsetX;
		previousY = event.offsetY;
	}

	function funcMouseMove(event){
		if(isMouseDown == true){
			ctx.beginPath();
			ctx.moveTo(previousX,previousY);
			ctx.lineTo(event.offsetX, event.offsetY);
			ctx.lineCap = "round";
			ctx.stroke();
			previousX = event.offsetX;
			previousY = event.offsetY;
		}
	}

	function funcMouseUp(event){
		isMouseDown = false;
	}

	function chooseColour(colour){
		ctx.strokeStyle = colour;
	}

	function setSize(){
		var size = +prompt("Set size for pen/eraser: ");
		ctx.lineWidth = size;
	}

	function clearCanvas(){
		ctx.clearRect(0,0,canvas.width,canvas.height);
	}
</script>
</body>
</html>