[OpenJDK 2D-Dev] Pixel-perfect drawing on JPanel

[Sergey Bylokhov]

Hi, Michał.

You can create a bug report here:
https://bugreport.java.com/bugreport

Please additionally to the test provide the system
information, and information about screen(resolutions and default scale factor).


On 20/12/2018 03:11, Michał Błaszak wrote:
> Hi All,
> 
> I hope this is a known problem but just in case it’s not.
> 
> Trying to make an app drawing something on JPanel I noticed some annoying inaccuracies.
> 
> The attached piece of code is supposed to draw a series of lines one below the other (swapping colors are to demonstrate what's happening).
> 
> The result is presented in the following picture:
> 
> That means that some pixels are unreachable.
> 
> I tested it on several jdk releases. Results are:
> 
> OpenJDK Runtime Environment (build 1.8.0_40-b25): Works correctly
> 
> OpenJDK Runtime Environment (build 9+181): Wrong behavior
> 
> OpenJDK Runtime Environment 18.3 (build 10.0.2+13): Wrong behavior
> 
> OpenJDK Runtime Environment 18.9 (build 11.0.1+13): Wrong behavior
> 
> The same inaccuracies are observable when using drawRect() or fillRect().
> 
> I wanted to report is a bug but I do not know how to do it.
> 
> Thank you for looking at it.
> 
> Best regards
> 
> *Michał Błaszak*
> 
> Section Manager, Research & Development
> 


-- 
Best regards, Sergey.