Java rounded corner bug

Question

I'm working on a GUI in Java, and I'm trying to give rounded corners to my borders.

JPanel recentProjectsPanel = new JPanel();
    recentProjectsPanel.setLayout(new BorderLayout());
    recentProjectsPanel.setBackground(Color.red);
    recentProjectsPanel.setBorder(new LineBorder(Color.green, 15, true));

This is the output I get (don't mind the colors):

Failing Border GUI

Why do I get these red stripes in the corners? Any way to fix this?

Be certain to honor the [opacity](http://java.sun.com/products/jfc/tsc/articles/painting/index.html#props) property. — trashgod, May 04 '12 at 11:09
If you look at the source code, the way the rounded corner border is painted is terrible...instead of setting a stroke and drawing a single rounded rectangle, successive rounded rectangles are drawn, which results in the above ugliness. — user1329572, May 04 '12 at 13:59

score 3 · Answer 1 · edited May 23 '17 at 12:13

3

You might use a variant of the TextBubbleBorder instead.

edited May 23 '17 at 12:13

Community

1
1

answered May 04 '12 at 12:09

Andrew Thompson

166,747
40
210
420

score 2 · Answer 2 · edited May 23 '17 at 12:19

2

Have a look at this

Java - rounded corner panel with compositing in paintComponent

this has much information regarding same.

edited May 23 '17 at 12:19

Community

1
1

answered May 04 '12 at 11:14

Rahul Borkar

2,724
2
22
38

Java rounded corner bug

2 Answers2