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imagosonus

which is the best way to animate css background-position property?

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I' m sorry, but i start using gsap, from a few days, so my question may be a little silly...
 
which is the best way to animate css background-position property?
 
I've tried doing:

TweenMax.to('.back', 8, {'background-position':300});

where '.back' is the element with background image.

.back {
  background: rgba(0, 0, 0, 0) url("img/seq2_0000.jpg") no-repeat fixed 0 0 / 200% 100%;
}

but what i'm tryng to get is a kind of 'seamless loop' in the background for example a sky and clouds horizontal moving.

 

Anyway GSAP is amazing!!!

 

 

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Hello imagosonus, and Welcome to the GreenSock Forum!

 

In order to animate the background-position property use backgroundPosition in your tween. Make sure you have your value in a string since background-position accepts two values left and top. Default is 0% 0%

 

See the Pen gavKab by jonathan (@jonathan) on CodePen

var tl = new TimelineMax({repeat:-1}); /* repeat loop forever */
tl.to("#clouds", 30,{
  backgroundPosition: "-2247px 0px", /* negative width of background image your animating - left top */
  ease: Linear.easeNone /* make sure you use Linear.easeNone so its smooth */
});

x
And with clouds and grass

 

See the Pen YyMKMz by jonathan (@jonathan) on CodePen

 

:)

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  • 5 months later...

Hello imagosonus, and Welcome to the GreenSock Forum!

 

In order to animate the background-position property use backgroundPosition in your tween. Make sure you have your value in a string since background-position accepts two values left and top. Default is 0% 0%

 

See the Pen gavKab by jonathan (@jonathan) on CodePen

var tl = new TimelineMax({repeat:-1}); /* repeat loop forever */
tl.to("#clouds", 30,{
  backgroundPosition: "-2247px 0px", /* negative width of background image your animating - left top */
  ease: Linear.easeNone /* make sure you use Linear.easeNone so its smooth */
});

x

And with clouds and grass

 

See the Pen YyMKMz by jonathan (@jonathan) on CodePen

 

:)

 

 

Hi Jonathan,

 

I am also new to Greensock. I'm trying to create a seamless looping cloud background image for a banner ad. The looping is working, but I have a 1 pixel line gap on the seam. I cannot figure out how to get rid of it. Any tips as to what might be causing it? Thank you!

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Hi smzweb04,

 

Welcome to the forums!

 

Do you think you could set a reduced case example? It could be so many things creating this pixel gap that would be very hard to troubleshot in the dark.

 

Here's a little video on how to if you are not familiar with CodePen:

 

And the forum thread:

http://greensock.com/forums/topic/9002-read-this-first-how-to-create-a-codepen-demo/

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  • 1 year later...

Hi,

 

I try to do a sprite animation with an image that is 4000x3800. And it works rather good but every time it changes row it "blinks". I want to move it 20 steps at a time vertical and after that move the image up 200 px and move image from left 0px to 4000px again.  This is the code I use.

<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  <title>Sprite Sheet Animation</title>
 
 <style> 
#character {
	width: 4000px; 
	height: 3800px;
	background: url(circle-sprite-2.png);
}
</style>
  
</head>

<body>
<div style="width: 200px; height: 200px; background-color: #ccc; overflow: hidden;">
<div id="character"></div>
</div>

  <script src='https://cdnjs.cloudflare.com/ajax/libs/gsap/1.19.1/TweenMax.min.js'></script>
var tlCircle = new TimelineMax({delay:0, repeat:-1, repeatDelay:0});	
	tlCircle.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 0)
	.set(character, {x:0, y:"-=200"}, 1)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 1)
	.set(character, {x:0, y:"-=200"}, 2)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 2)
	.set(character, {x:0, y:"-=200"}, 3)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 3)
	.set(character, {x:0, y:"-=200"}, 4)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 4)
	.set(character, {x:0, y:"-=200"}, 5)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 5)
	.set(character, {x:0, y:"-=200"}, 6)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 6)
	.set(character, {x:0, y:"-=200"}, 7)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 7)
	.set(character, {x:0, y:"-=200"}, 8)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 8)
	.set(character, {x:0, y:"-=200"}, 9)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 9)
	.set(character, {x:0, y:"-=200"}, 10)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 10)
	.set(character, {x:0, y:"-=200"}, 11)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 11)
	.set(character, {x:0, y:"-=200"}, 12)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 12)
	.set(character, {x:0, y:"-=200"}, 13)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 13)
	.set(character, {x:0, y:"-=200"}, 14)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 14)
	.set(character, {x:0, y:"-=200"}, 15)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 15)
	.set(character, {x:0, y:"-=200"}, 16)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 16)
	.set(character, {x:0, y:"-=200"}, 17)
	.to(character, 1, {x:-4000, ease:SteppedEase.config(20)}, 17)
	.set(character, {x:0, y:"-=200"}, 18)
	.to(character, .8, {x:-2800, ease:SteppedEase.config(14)}, 18)

 

Is there a smarter way to do this? I guess there is... :)

 

//Devotee007

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