Application Architecture Design

Hi,

I need to put together an architecture for an application and would appreciate any pointers you could give me.

The requirements:

A rich client application
A web version (applet)
Needs to "look like a Windows application"
Ideally also run on non-Windows platforms, e.g. Mac.
Displays a vector image
Allows the user to interact with the vector image, (left and right) click on it, altering the image generation rules and subsequent re-drawing of the image. Basically I need to capture the click event, know where the cursor was etc.

The rich client application and the web (applet) version should have indentical functionality and be similar in appearance / usability.

Questions:

1. What is the best rich client API selection to use that would also either support or fit well with an applet version?

2. What is the best method for drawing vector images and then supporting interaction with the image (say, left and right clicking, context menus etc) for rich client and applet?

3. What APIs will give me the closest appearance to Windows, e.g. SWT/JFACE?

I know these are big questions, but any help you could give would be appreciated.

From what I've seen SWT / JFace looks promising in terms of Windows-like appearance, but I have no idea about applets, drawing vector images and interacting with them etc.

Cheers

B.

* bump *