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List: openjdk-2d-dev
Subject: [OpenJDK 2D-Dev] Pixel-perfect drawing on JPanel
From: Michał_Błaszak <mibl () stibosystems ! com>
Date: 2018-12-20 11:11:53
Message-ID: AM0PR01MB4577AF9AC3F7275958C44243AABF0 () AM0PR01MB4577 ! eurprd01 ! prod ! exchangelabs ! com
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[Attachment #2 (multipart/related)]
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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 i=
naccuracies.
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:
[cid:image003.jpg@01D4985D.2FD2C670]
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
Micha=B3 B=B3aszak
Section Manager, Research & Development
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<p class="MsoNormal"><span lang="PL">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PL"><o:p> </o:p></span></p>
<p class="MsoNormal">I hope this is a known problem but just in case it’s \
not.<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Trying to make an app drawing something on JPanel I noticed some \
annoying inaccuracies.<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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).<o:p></o:p></p> <p class="MsoNormal">The result is presented in the \
following picture:<o:p></o:p></p> <p class="MsoNormal"><img width="562" height="114" \
style="width:5.85in;height:1.1833in" id="Picture_x0020_1" \
src="cid:image003.jpg@01D4985D.2FD2C670"><o:p></o:p></p> <p \
class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">That means that some \
pixels are unreachable.<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tested it on several jdk releases. Results are:<o:p></o:p></p>
<p class="MsoNormal">OpenJDK Runtime Environment (build 1.8.0_40-b25): Works \
correctly<o:p></o:p></p> <p class="MsoNormal">OpenJDK Runtime Environment (build \
9+181): Wrong behavior<o:p></o:p></p> <p class="MsoNormal">OpenJDK Runtime \
Environment 18.3 (build 10.0.2+13): Wrong behavior<o:p></o:p></p> <p \
class="MsoNormal">OpenJDK Runtime Environment 18.9 (build 11.0.1+13): Wrong \
behavior<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The same inaccuracies are observable when using drawRect() or \
fillRect().<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I wanted to report is a bug but I do not know how to do \
it.<o:p></o:p></p> <p class="MsoNormal">Thank you for looking at it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span \
style="font-family:"Arial",sans-serif;color:#535353;mso-fareast-language:DA">Best \
regards</span><span style="font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:DA"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span \
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<p class="MsoNormal" style="text-autospace:none"><b><span \
style="font-family:"Arial",sans-serif;color:#FF4000;mso-fareast-language:DA">Michał \
Błaszak<o:p></o:p></span></b></p> <p class="MsoNormal"><span \
style="font-family:"Arial",sans-serif;color:#535353;mso-fareast-language:DA">Section \
Manager, Research & Development</span><span \
style="color:#1F497D"><o:p></o:p></span></p> <p \
class="MsoNormal"><o:p> </o:p></p> </div>
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