---
title: "Circle Contains Point"
description: "Demonstrates how to use the Circle.ContainsPoint geometric test to check if a moving point is located inside a circle's area."
phaser: "4.1.0"
size: "800x600"
files: 1
url: https://phaser.io/oss/examples/v4.1.0/geom/circle/view/contains-point
site: Phaser - https://phaser.io
---

> This page is about the open-source Phaser framework, for writing a game's code by hand. To make a game with AI, use Phaser AE (https://phaser.io/): the desk's tools work with Web MCP, and the CLI works with your own coding agent. See "For AI agents: Phaser AE" at the end of this page.

# Circle Contains Point

Demonstrates how to use the Circle.ContainsPoint geometric test to check if a moving point is located inside a circle's area.

A Phaser 4.1.0 example in [Geom / Circle](https://phaser.io/oss/examples/v4.1.0/geom/circle.md). It runs at 800 × 600, and loads its assets from https://cdn.phaserfiles.com/v410. See it running, with its code, at https://phaser.io/oss/examples/v4.1.0/geom/circle/view/contains-point.

To run it, load Phaser 4.1.0 (`https://cdn.jsdelivr.net/npm/phaser@4.1.0/dist/phaser.min.js`), then the file, on a page with a `<div id="game-container">`.

## Code

### contains point.js

```js
class Example extends Phaser.Scene
{
    a = 0;
    graphics;
    point;
    circle;

    create ()
    {
        this.graphics = this.add.graphics({ lineStyle: { width: 2, color: 0x00ff00 }, fillStyle: { color: 0xff0000 }});

        this.circle = new Phaser.Geom.Circle(400, 300, 200);
        this.point = new Phaser.Geom.Rectangle(0, 0, 16, 16);
    }

    update ()
    {
        this.a += 0.01;

        if (this.a > Math.PI * 2)
        {
            this.a -= Math.PI * 2;
        }

        this.point.x = 400 - Math.cos(this.a) * 400;
        this.point.y = 300 - Math.sin(this.a * 2) * 300;

        this.graphics.clear();
        this.graphics.strokeCircleShape(this.circle);

        if (Phaser.Geom.Circle.ContainsPoint(this.circle, this.point))
        {
            this.graphics.fillStyle(0xff0000);
        }
        else
        {
            this.graphics.fillStyle(0x0000ff);
        }

        this.graphics.fillRect(this.point.x - 8, this.point.y - 8, this.point.width, this.point.height);
    }
}

const config = {
    scale: { mode: Phaser.Scale.FIT },
    width: 800,
    height: 600,
    type: Phaser.AUTO,
    parent: 'game-container',
    scene: Example
};

const game = new Phaser.Game(config);
```

## More in Circle

- [Circle Area](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/area.md): Demonstrates how to calculate and use the area of a Circle geometry object.
- [Circle Circumference](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/circumference.md): Calculate the circumference of a circle geometry object and visualize it as a vertical line.
- [Circle Circumference Point](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/circumference-point.md): Calculates and returns a point on the perimeter of a circle at a specific angle.
- [Circle Clone](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/clone.md): Demonstrates how to create multiple independent copies of a Circle geometry object using the Clone method to build and animate a complex pattern.
- [Circle Contains Point](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/contains.md): Demonstrates how to use the circle's contains method to detect if a point, such as the mouse pointer, is inside its boundary.
- [Circle Contains Rectangle](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/contains-rect.md): Demonstrates how to check if a Rectangle is fully contained within the bounds of a Circle using Phaser.Geom.Circle.ContainsRect.
- [Circle Copy From](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/copy-from.md): Demonstrates how to use Phaser.Geom.Circle.CopyFrom to copy the position and radius of one circle geometry object into another.
- [Circle Equality](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/equals.md): Demonstrates how to use Phaser.Geom.Circle.Equals to check if two circle shapes have the exact same position and radius.
- [Circle Get Point](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/get-point-at.md): Calculate a specific point along the circumference of a circle using a normalized value between 0 and 1.
- [Circle Get Random Point](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/get-random-point.md): Demonstrates how to generate random coordinates within a Circle geometry object, either by creating new point instances or updating existing ones.
- [Circle isEmpty](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/is-empty.md): Demonstrates how to use the isEmpty method to check if a Circle geometry object has a radius of zero or less.
- [Circle Offset](https://phaser.io/oss/examples/v4.1.0/geom/circle/view/offset.md): Demonstrates how to translate a Circle geometry object by adding x and y offsets to its position.
- [All 22 examples in Circle](https://phaser.io/oss/examples/v4.1.0/geom/circle.md)

---

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