Canvas Snow

Developer
Kevin
Size
2,694 Kb
Views
40,480
  1. Canvas Snow Previews
  2. Canvas Snow HTML Codes
  3. Canvas Snow CSS Codes
  4. Canvas Snow JS Codes

How do I make an canvas snow?

Snow effect using two canvas elements. Direction of snow flakes is dependent on mouse position. The main canvas contains the animated flakes. The background canvas contains the gradient and flakes that have landed.. What is a canvas snow? How do you make a canvas snow? This script and codes were developed by Kevin on 27 August 2022, Saturday.

Canvas Snow Previews
IQ Test

Canvas Snow - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Canvas Snow</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="css/style.css">
</head>
<body> <canvas id="bgCanvas"></canvas>
<canvas id = "canvas"></canvas> <script src="js/index.js"></script>
</body>
</html>

Canvas Snow - Script Codes CSS Codes

body{ margin: 0;
}
#canvas{ display: block; position: absolute; height: 100vh; width: 100vw; z-index:1;
}
#bgCanvas{ display: block; position: absolute; height: 100vh; width: 100vw; z-index:-10;
}

Canvas Snow - Script Codes JS Codes

function draw() { var canvas = document.getElementById("canvas"); var bgCanvas = document.getElementById("bgCanvas"); canvas.width = window.innerWidth; canvas.height = window.innerHeight; bgCanvas.width = window.innerWidth; bgCanvas.height = window.innerHeight; if (canvas.getContext) { var ctx = canvas.getContext("2d"); var bgCtx = bgCanvas.getContext("2d"); var flakes = []; function Flake(xPos, yPos, size, ySpeed) { this.xPos = xPos; this.yPos = yPos; this.size = size; this.ySpeed = ySpeed; } var windAngle = 0; canvas.addEventListener('mousemove', function(e) { var xCoord = e.clientX; windAngle = (xCoord - (canvas.width / 2)) / (canvas.width / 2); }, false) var skyGrad = bgCtx.createLinearGradient(0, 0, 0, canvas.height / 2); skyGrad.addColorStop(0, "black"); skyGrad.addColorStop(.4, "black"); skyGrad.addColorStop(1, "rgb(20,20,50)"); var groundGrad = bgCtx.createLinearGradient(0, canvas.height / 2, 0, canvas.height); groundGrad.addColorStop(0, "rgb(20,20,50)"); groundGrad.addColorStop(.1, "rgb(5,5,12)"); groundGrad.addColorStop(1, "rgb(50,50,50)"); bgCtx.fillStyle = skyGrad; bgCtx.fillRect(0, 0, canvas.width, canvas.height / 2 + 1); bgCtx.fillStyle = groundGrad; bgCtx.fillRect(0, canvas.height / 2, canvas.width, canvas.height); var landedGrad = bgCtx.createRadialGradient(0, 0, 0, 0, 0, 8); landedGrad.addColorStop(0, "rgba(255,255,255,1)"); landedGrad.addColorStop(1, "rgba(255,255,255,0)"); bgCtx.fillStyle = landedGrad; function landedFlake(flake, x) { bgCtx.save(); bgCtx.scale(1, .50); bgCtx.beginPath(); bgCtx.translate(flake.xPos, flake.yPos * 2); bgCtx.arc(0, 0, flake.size, 0, 2 * Math.PI); bgCtx.fill(); flakes.splice(x, 1); bgCtx.restore(); } var flakeGrad = ctx.createRadialGradient(0, 0, 0, 0, 0, 8); flakeGrad.addColorStop(0, "white"); flakeGrad.addColorStop(1, "rgba(255,255,255,0)"); ctx.fillStyle = flakeGrad; function snowFall() { ctx.clearRect(0, 0, canvas.width, canvas.height); var random200 = Math.floor((Math.random() * 200) + 1); var randomSize = random200 / 20; var randomXPos = Math.floor((Math.random() * canvas.width) + 1) - randomSize; var flake = new Flake(randomXPos, 0 - randomSize, randomSize, randomSize / 2.5); flakes.push(flake); for (var x = 0; x < flakes.length; x++) { if (flakes[x].yPos > canvas.height / 2 + ((canvas.height / 2) / 200) * (flakes[x].size * 20)) { landedFlake(flakes[x], x); x--; continue; } ctx.beginPath(); ctx.translate(flakes[x].xPos, flakes[x].yPos); ctx.arc(0, 0, flakes[x].size, 0, Math.PI * 2); ctx.fill(); ctx.translate(-flakes[x].xPos, -flakes[x].yPos); flakes[x].yPos += flakes[x].ySpeed; flakes[x].xPos += flakes[x].ySpeed * windAngle; if (flakes[x].xPos - flakes[x].size > canvas.width) { flakes[x].xPos -= canvas.width; } if (flakes[x].xPos + flakes[x].size < 0) { flakes[x].xPos += canvas.width; } } requestAnimationFrame(snowFall); } snowFall(); }
}
draw();
Canvas Snow - Script Codes
Canvas Snow - Script Codes
Home Page Home
Developer Kevin
Username KevinBruland
Uploaded August 27, 2022
Rating 3
Size 2,694 Kb
Views 40,480
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