Sprite borders flicker on movement

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larrynachos

- HellMax
- - Joined 3 Jan, 2013
  - 55 topics • 146 posts
- 1
- 8 Mar, 2018
- Quote
Problem Description

A normal non-transparent sprite flickers on movement with scroll-to. This is only fixed by adding some transparent space between the object border and the sprite border.

P.S.

I believe the same error in code makes TileMaps flicker

https://www.scirra.com/forum/viewtopic.php?t=199192

Attach a Capx

https://helldeveloper.weebly.com/uploads/6/0/6/6/6066363/grassbug.capx

Description of Capx

press W to observe the effect. On the upper side, there are sprites without empty space between borders. On the lower side, there are 10 transparent pixel on each side of each sprite.

Steps to Reproduce Bug
- Add a scrollto behaviour to your sprite
- Move past an object wihtout transparent pixels
Observed Result

Flickering of borders

Expected Result

No flickering on borders.

Affected Browsers
- Chrome: (YES)
- FireFox: (YES)
- Internet Explorer: (YES)
Operating System and Service Pack

Windows 10

Construct 2 Version ID

r255
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- Ashley Construct Team Founder
- Moderator
- - Joined 21 May, 2007
  - 669 topics • 30,357 posts
- 1
- 12 Mar, 2018
- Quote
This is a normal result in computer graphics. Sprite images are clipped to their display box (quad). This means pixels at the edges can only be on or off. This causes aliasing when using floating-point positioning. Adding a 1px transparent border allows the edge pixels to have intermediate results thanks to bilinear sampling. Construct 2 adds this by default when cropping sprites to help avoid the aliasing problem. Closing as not a bug.