Canvas Draw Bezier

Posted in Canvas Tutorial

Updated on May 19, 2024

By Mari Selvan

👁️ 68 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In the realm of HTML5 canvas graphics, the Bezier curve is a powerful tool for creating smooth and visually appealing curves. Understanding how to draw Bezier curves using the canvas API opens up possibilities for creating complex shapes, animations, and interactive elements.

In this guide, we'll explore the syntax, methods, and techniques for drawing Bezier curves on the HTML5 canvas.

💡 Syntax

The canvas API provides methods for drawing Bezier curves, including quadratic and cubic curves. The basic syntax involves specifying control points that define the curve's shape. Here's an overview:

Quadratic Bezier Curve:

Syntax

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context.quadraticCurveTo(cp1x, cp1y, x, y);

Cubic Bezier Curve:

Syntax

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context.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y);

🧰 Methods

quadraticCurveTo(cp1x, cp1y, x, y): Draws a quadratic Bezier curve from the current pen position to the specified end point (x, y) using the control point (cp1x, cp1y).
bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y): Draws a cubic Bezier curve from the current pen position to the specified end point (x, y) using two control points (cp1x, cp1y) and (cp2x, cp2y).

🧰 Attribute Values:

The control points (cp1x, cp1y) and (cp2x, cp2y) determine the shape of the Bezier curve, while (x, y) specifies the end point of the curve.

📄 Example

Let's draw a quadratic Bezier curve on the canvas:

index.html

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<canvas id="myCanvas" width="400" height="200"></canvas>
<script>
  var canvas = document.getElementById('myCanvas');
  var context = canvas.getContext('2d');
  
  context.beginPath();
  context.moveTo(50, 50); // Starting point
  context.quadraticCurveTo(100, 25, 200, 100); // Control point and end point
  context.stroke();
</script>

🧠 How it works?

This code snippet draws a quadratic Bezier curve from (50, 50) to (200, 100) with a control point at (100, 25).

🎉 Conclusion

Mastering the art of drawing Bezier curves on the HTML5 canvas empowers you to create intricate graphics and animations in web applications.

By understanding the syntax, methods, and attributes involved, you can unleash your creativity and produce visually stunning content that captivates your audience.