javascript - How to draw Cloud shape in HTML5 Canvas?

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javascript - How to draw Cloud shape in HTML5 Canvas?

asked Jan 31, 2022 in Technique[技术] by 深蓝 (71.8m points)

I am working on drawing of different shapes using HTML5 Canvas & javascript. But i am not gettting the calculation for drawing CLOUD shape in HTML5Canvas. I am trying to draw CLOUD shape using 2 points (i.e. Start point & End point). kindly suggest some ideas? Thanks

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1 Answer

深蓝 · Answer 1 · 2022-01-31T07:26:48+0000

Ref. Link : http://www.html5canvastutorials.com/advanced/html5-canvas-save-drawing-as-an-image/

var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');

// draw cloud
context.beginPath();
context.moveTo(170, 80);
context.bezierCurveTo(130, 100, 130, 150, 230, 150);
context.bezierCurveTo(250, 180, 320, 180, 340, 150);
context.bezierCurveTo(420, 150, 420, 120, 390, 100);
context.bezierCurveTo(430, 40, 370, 30, 340, 50);
context.bezierCurveTo(320, 5, 250, 20, 250, 50);
context.bezierCurveTo(200, 5, 150, 20, 170, 80);
context.closePath();
context.lineWidth = 5;
context.fillStyle = '#8ED6FF';
context.fill();
context.strokeStyle = '#0000ff';
context.stroke();

// save canvas image as data url (png format by default)
var dataURL = canvas.toDataURL();

// set canvasImg image src to dataURL
// so it can be saved as an image
document.getElementById('canvasImg').src = dataURL;

body {
  margin: 0px;
  padding: 0px;
}

<!DOCTYPE HTML>
<html>

<head>
</head>

<body>
  <canvas id="myCanvas" width="578" height="200" style="display:none;"></canvas>
  <img id="canvasImg" alt="Right click to save me!">
</body>

</html>

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