# Need help for p5.js ellipse "detail"

**URL:** <https://discourse.processing.org/t/need-help-for-p5-js-ellipse-detail/13983>\
**Category:** Beginners\
**Created:** [September 14, 2019, 5:17am UTC](https://discourse.processing.org/t/need-help-for-p5-js-ellipse-detail/13983 "2019-09-14T05:17:59Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![SayokoWang](https://avatars.discourse-cdn.com/v4/letter/s/eada6e/32.png) [@SayokoWang](https://discourse.processing.org/u/SayokoWang)\
**Post date:** [September 14, 2019, 5:17am UTC](https://discourse.processing.org/t/need-help-for-p5-js-ellipse-detail/13983/1 "2019-09-14T05:17:59Z")

</div>

Hi, I am new to p5.js;

now I can draw ellipse ; but I don’t understand the “detail” in  
ellipse(x, y, w, h, detail) , how to use “detail”, I found no one example for it.

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<div class="post-metadata">

**Author:** ![kll](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/kll/32/964_2.png) [@kll](https://discourse.processing.org/u/kll)\
**Post date:** [September 14, 2019, 5:49am UTC](https://discourse.processing.org/t/need-help-for-p5-js-ellipse-detail/13983/2 "2019-09-14T05:49:13Z")

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as the  
[https://p5js.org/reference/#/p5/ellipse](https://p5js.org/reference/#/p5/ellipse)  
say need WEBGL  
[https://p5js.org/reference/#/p5/createCanvas](https://p5js.org/reference/#/p5/createCanvas)

```auto
function setup() {
  createCanvas(400, 400, WEBGL);
  frameRate(1);
}

function draw() {
  background(200,200,0);
  let detail = int(mouseX/20.0);
  print(detail);
  ellipse(0,0,100,100,detail);
}

```

[https://editor.p5js.org/kll/sketches/JMYKsuqUh](https://editor.p5js.org/kll/sketches/JMYKsuqUh)

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<div class="post-metadata">

**Author:** ![SayokoWang](https://avatars.discourse-cdn.com/v4/letter/s/eada6e/32.png) [@SayokoWang](https://discourse.processing.org/u/SayokoWang)\
**Post date:** [September 14, 2019, 6:35am UTC](https://discourse.processing.org/t/need-help-for-p5-js-ellipse-detail/13983/3 "2019-09-14T06:35:13Z")

</div>

Thank you very much , I understand now 🙂