utiLITI windows scaling issues

[profiluefter]

If I open utiLITI on my 4k monitor, the tiles of a map get scaled but the grid doesn't and weird rendering issues appear.

A workaround to get it working is to let windows handle the scaling. This is done via the compatibility settings by selecting system as a scaling mode. The downside of this workaround is that the UI gets blurry.

[nightm4re94]

Thanks for reporting this!

[nightm4re94]

Sorry, can't test without having a 4k monitor at my disposal :/ anyone else?

[profiluefter]

I can test builds for you but I currently don't have time to look into the source code or something like that

[steffen-wilke]

Just to track this: WQHD (2560 x1440) works fine.

[nightm4re94]

While working on my Laptop with FullHD resolution, I also encountered this issue (and it persists, no matter which game project I edit).
The rendering of the Tiles is misaligned from the actual grid, as you can see in the screenshot below:

If I zoom out more, the offset increases.

[nightm4re94]

Today we have been able to reproduce the issue on my laptop:
When using the built-in Windows scaling feature (for readability on small screens), the Entity bounding boxes are rendered with an offset.
Can you confirm this as the reason for the issue? Try messing around with Windows scaling settings and see if the problem still occurs.

[profiluefter]

Monitor scaling 100%:

Monitor scaling 150%:

Monitor scaling 200%:

So I'm pretty sure this is the reason for this issue, yes.

[nightm4re94]

Thanks for checking it out! We may already have a lead on this, but oddly this doesn't seem to happen on all hardware.

[steffen-wilke]

Update: This issue is related to the installed/used JDK version. It works as expected for up until Java 8 (tested with jdk1.8.0_201).
The problem occurs, starting with Java 9 and above. Tested with jdk-9.0.4, jdk-11.0.2, jdk-13.0.2

[steffen-wilke]

Possibly related to HiDPI support, implemented with Java 9:
JEP 263: HiDPI Graphics on Windows and Linux

see also: jfree/jfreechart#170

[steffen-wilke]

Starting with Java9, the implementation defines a default transformation for the Graphics2D object to support HighDPI settings:

JAVA 9:

JAVA 8

When rendering Shapes we overwrite the default AffineTransform of the Graphics2D object:

litiengine/src/de/gurkenlabs/litiengine/graphics/ShapeRenderer.java

Lines 73 to 76 in 0af1561

	final AffineTransform oldTransForm = g.getTransform();
	g.setTransform(transform);
	renderOutline(g, shape, stroke);
	g.setTransform(oldTransForm);