How to detect object by going near to it

**Sudharshan** · 03-10-2012, 02:48 AM

I am new to java i have plot of line if i go near to the line it should be highlighted for example in the below link
How This Bear Market Compares - Interactive Graphic - NYTimes.com

In this link when you go closer to the line it will be highlighted how to implement it.

**ozzyman** · 03-10-2012, 03:44 AM

If you want something like that (in the link you provided), especially for a website, it would probably be better and a lot easier to do it in SVG & HTML5.

If you still want to do this in Java you will need to look at a few things,

Mouse Motion Listener: (to detect onmouseover events)
How to Write a Mouse-Motion Listener (The Java™ Tutorials > Creating a GUI With JFC/Swing > Writing Event Listeners)

Drawing lines with Java 2D:
Drawing Geometric Primitives (The Java™ Tutorials > 2D Graphics > Working with Geometry)

**Sudharshan** · 03-13-2012, 08:28 PM

Originally Posted by ozzyman

If you want something like that (in the link you provided), especially for a website, it would probably be better and a lot easier to do it in SVG & HTML5.

If you still want to do this in Java you will need to look at a few things,

Mouse Motion Listener: (to detect onmouseover events)
How to Write a Mouse-Motion Listener (The Java™ Tutorials > Creating a GUI With JFC/Swing > Writing Event Listeners)

Drawing lines with Java 2D:
Drawing Geometric Primitives (The Java™ Tutorials > 2D Graphics > Working with Geometry)

thanks for the info i will try with the method described above but i have implemented when my mouse go above the line it is detecting but i want to detect line when my mouse cursor is 5 or 10 pixel away from line

**Norm** · 03-13-2012, 08:45 PM

i want to detect line when my mouse cursor is 5 or 10 pixel away from line

If you know where the mouse is and where the line is, you should be able to compute the distance between them.

**DarrylBurke** · 03-13-2012, 08:52 PM

Originally Posted by Norm

If you know where the mouse is and where the line is, you should be able to compute the distance between them.

Line2D has a couple of methods for that...

db

**Norm** · 03-13-2012, 08:53 PM

How do you know of all these methods?

**DarrylBurke** · 03-13-2012, 09:08 PM

By hanging around forums for years ;)

db

**Norm** · 03-13-2012, 09:11 PM

And having a brain like flypaper.

**DarrylBurke** · 03-13-2012, 10:40 PM

Like used flypaper :)

**DarrylBurke** · 03-13-2012, 10:44 PM

More seriously, since I'm not a programmer, I'm free to learn and remember whichever aspects of Java take my interest. So while I've picked up quite a bit about Swing and Java2D, I know next to nothing about networking, and have to look at I/O API 20 times to write a few lines of code to read a text file.

You guys have to handle whatever the job throws at you, and if that doesn't happen to appeal to you it won't stick so well. Even so, your knowledge is several orders of magnitude greater than mine.

db