Moving Java Drawing Objects

manolakis · 10-03-2009, 09:04 PM

Hi there,

I have made a Java GUI which has a panel where I draw different kind of objects like circles, rectagulars, lines, etc. I would like to ask if anyone knows how is it possible to be able to select these objects with the mouse and drag them to a different location? Where I really stack is at the draging.
Any ideads?

Thank you.

lutusp · 10-03-2009, 10:27 PM

Quote:

Originally Posted by manolakis

Hi there,

I have made a Java GUI which has a panel where I draw different kind of objects like circles, rectagulars, lines, etc. I would like to ask if anyone knows how is it possible to be able to select these objects with the mouse and drag them to a different location? Where I really stack is at the draging.
Any ideads?

Thank you.

You need to create a system of relocatable, transparent, borderless windows, windows whose only opaque content is the lines or geometric objects. Then you can select them with the mouse and move them around.

Be sure to put in a way to change the z-order of the windows. That is a standard and essential feature of this kind of drawing program.

manolakis · 10-05-2009, 04:45 PM

lutusp,

Because I do not know everything about Java GUIs could you please give an example of what you mean. I can not to do that by having a sub-class of a JPanel and overwriting the paintComponent(Graphics g) method? What exactly windows do I have to use? Could you give me example of Java classes that you mean?

Thank you very much.

lutusp · 10-05-2009, 06:14 PM

Quote:

Originally Posted by manolakis

lutusp,

Because I do not know everything about Java GUIs could you please give an example of what you mean. I can not to do that by having a sub-class of a JPanel and overwriting the paintComponent(Graphics g) method? What exactly windows do I have to use? Could you give me example of Java classes that you mean?

Thank you very much.

Java Swing

You need to learn this stuff just like everyone else, by browsing, reading, learning, and coding. Good luck.

Fallen_Demon · 10-05-2009, 11:37 PM

I recently did this. Basically, you want a generic shape object and a method in it that can detect whether a given point is inside it. Then, you want a "drag" method that you can use to change the co-ordinates of the model. If you've done MVC right it should be simple to decouple it to the point where this isn't a pain