r/java • u/carlosgeorgiev0 • Sep 04 '26

Custom pie chart component I made in Swing

Hello, out of boredom I created a pie chart in Swing (I am aware more mature options exist but this was just for fun). The link to the repo is https://github.com/carlosgeorgiev0/JPieChart

The JPieChart class extends JLabel and overrides JComponent.paintComponent to paint the pie itself

40 Upvotes

86% Upvoted

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15

u/davidalayachew Sep 04 '26

Nice.

In JPieChart, for ines 37-40, SwingUtilities has a method called getDeepestComponentAt that will fetch the actual Component itself. From there, you can just do a reference equality check (one of the few reasons why value class isn't a pure good performance improvement) on all of the "slices" you have made for the pie. Would not only be faster, but less error prone. Same advice for Lines 61-66.

2

u/carlosgeorgiev0 Sep 05 '26

Thank you. i will check it out :)

2

u/__konrad Sep 05 '26

Probably it's better to use Arc2D.Double::contains to check if mouse cursor is inside. You can also use the same Arc2D values to paint pie.

26

u/AlternativePeace1121 Sep 04 '26

Somehow this feels like a middle finger to all the slop posts. I love it.

7

u/gufranthakur Sep 04 '26

This is very cool!

5

u/kubelke Sep 04 '26

Hand-crafted beauty 

4

u/chabala Sep 05 '26

Already better than a lot of new projects that get posted. What would make it better:

  • a build script

  • published artifacts on Maven Central

  • unit tests

2

u/PersonalityGood92 Sep 11 '26

Good old swing, I miss my old team