Masking

[EA10 0 Likes (Newbie)]

Hi guys I'm trying emulate css masking on sendpotion  where the purple div scales behind the image but somehow I my work isn't as working wrll

[GSAP Helper 97 Likes (Contributor)]

It's pretty tough to troubleshoot without a minimal demo - the issue could be caused by CSS, markup, a third party library, your browser, an external script that's totally unrelated to GSAP, etc. Would you please provide a very simple CodePen or CodeSandbox that demonstrates the issue? 

 

Please don't include your whole project. Just some colored <div> elements and the GSAP code is best (avoid frameworks if possible). See if you can recreate the issue with as few dependancies as possible. If not, incrementally add code bit by bit until it breaks. Usually people solve their own issues during this process! If not, then at least we have a reduced test case which greatly increases your chances of getting a relevant answer.

 

Here's a starter CodePen that loads all the plugins. Just click "fork" at the bottom right and make your minimal demo: 

See the Pen aYYOdN by GreenSock (@GreenSock) on CodePen

 

If you're using something like React/Next/Vue/Nuxt or some other framework, you may find StackBlitz easier to use. We have a series of collections with different templates for you to get started on these different frameworks: React/Next/Vue/Nuxt.

 

Once we see an isolated demo, we'll do our best to jump in and help with your GSAP-specific questions. 

[EA10 0 Likes (Newbie)]

Here is the link 

See the Pen poOWdPw?editors=1111 by EAchris10 (@EAchris10) on CodePen

 i'm trying to emulate the masking effect on sendpotion, i want the blue mask appearing from behind that image to scale and fill the entire screen which is the header and also the smooth scaling.

[Cassie 5,406 Likes (Superhero)]

Hi this demo isn't loading at all - can you make sure it's actually rendering content and showing the issue. Thanks!

[Rodrigo 5,420 Likes (Superhero)]

Hi,

 

You are importing some stuff that can't be located:

import img1 from './assets/test.jpg';
import './test.css';

Is better to use one of our GSAP + React starter templates in Stackblitz for scaffolding a minimal demo:

https://stackblitz.com/@GreenSockLearning/collections/gsap-react-starters

 

Happy Tweening!

[EA10 0 Likes (Newbie)]

Please refer back to the link, i updated it to use a remote image.

[EA10 0 Likes (Newbie)]

Here is a codesandbox url masking

[Rodrigo 5,420 Likes (Superhero)]

Hi,

 

How exactly this is not working?

 

I can see the light blue circle growing and using the entire screen, so I'm a bit lost in terms of what you're trying to do and how this current approach is not achieving that 🤷‍♂️

 

Please be more specific about what you want to do and how your current code is not working.

 

Also is better to create all your GSAP instances in the MatchMedia instance, this particular instance won't get cleaned up properly and you could run into issues with the double calls in effect hooks, that React uses on strict mode:

useLayoutEffect(() => {
  gsap.to(".mask", {
    scale: 12.18999,
    scrollTrigger: {
      trigger: "#img",
      start: "center bottom",
      markers: true,
      // pin: true,
      scrub: true
      // end: "+=200%"
    }
  });
}, []);

What you can do is either use the current MatchMedia instance you have and add that particular instance with a very small screen size, so you can be sure that it will be created just one and for all the screen sizes (something like min-width: 100px). Another option is to create a GSAP Context instance in that effect hook:

useLayoutEffect(() => {
  const ctx = gsap.context(() => {
    gsap.to(".mask", {
      scale: 12.18999,
      scrollTrigger: {
        trigger: "#img",
        start: "center bottom",
        markers: true,
        // pin: true,
        scrub: true
        // end: "+=200%"
      }
    });
  });
  return () => ctx.revert();
}, []);

Hopefully this helps.

Happy Tweening!