The `CanvasRenderingContext2D.quadraticCurveTo()` method of the Canvas 2D API adds a quadratic Bézier curve to the current sub-path. It requires two points: the first one is a control point and the second one is the end point. The starting point is the latest point in the current path, which can be changed using `moveTo()` before creating the quadratic Bézier curve.

## Syntax

js
``````quadraticCurveTo(cpx, cpy, x, y)
``````

### Parameters

`cpx`

The x-axis coordinate of the control point.

`cpy`

The y-axis coordinate of the control point.

`x`

The x-axis coordinate of the end point.

`y`

The y-axis coordinate of the end point.

## Examples

This example shows how a quadratic Bézier curve is drawn.

#### HTML

html
``````<canvas id="canvas"></canvas>
``````

#### JavaScript

js
``````const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");

ctx.beginPath();
ctx.moveTo(50, 20);
ctx.stroke();

// Start and end points
ctx.fillStyle = "blue";
ctx.beginPath();
ctx.arc(50, 20, 5, 0, 2 * Math.PI); // Start point
ctx.arc(50, 100, 5, 0, 2 * Math.PI); // End point
ctx.fill();

// Control point
ctx.fillStyle = "red";
ctx.beginPath();
ctx.arc(230, 30, 5, 0, 2 * Math.PI);
ctx.fill();
``````

#### Result

In this example, the control point is red and the start and end points are blue.

This example draws a simple quadratic Bézier curve using `quadraticCurveTo()`.

#### HTML

html
``````<canvas id="canvas"></canvas>
``````

#### JavaScript

The curve begins at the point specified by `moveTo()`: (20, 110). The control point is placed at (230, 150). The curve ends at (250, 20).

js
``````const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");

ctx.beginPath();
ctx.moveTo(20, 110);
ctx.stroke();
``````

Specification
HTML Standard