Dmitrii, So we are finally ready to write some code for your first OpenJUMP plug-in!
There are a couple of different ways to approach the design of a simple plug-in. In the first approach you cram all of your code in a single class that extends the AbstractPlugInClass. In the second approach (the approach that I like to take) you put the code that does the heavy lifting for your plug-in in a supporting class or classes, and you just use the extension of the AbstractPlugIn handle the housekeeping and GUI. So in your case I think we can likely get buy with two classes to start: LineStringSimplifierPlugIn (Does the housekeeping.) LineStringSimplifier (Does the heavy lifting.) Actually, I think we should make LineStringSimplifier an interface so we can swap out different implementations of a simplification algorithm without too much trouble. For our first attempt at the plug-in I'm going to place the following restrictions on our design so we can keep things simple: - We will obtain the LineStrings that will be simplified from the SelectionManager. This will allow us to work with OpenJUMP's existing code. There are other ways to let the user choose the LineStrings to be simplified, but this will be the easiest way. With this method the user will create the selection of LineStrings using the existing slection tool, and we will work with the LineStrings in that selection. - We won't allow the user to control the simplification process with any parameters. We are going to use some "default" parameters in our algorithm. This restriction will eliminate the need for a GUI where the user enters the parameter values. However, we will code our LineStringSimplifier interface to accept parameters so we can add support for them and a GUI entry form later if you want. We can use a SimplificationParams class to pass the parameters to our algorithim. If these restrictions don't make sense now, they will as we work through this example. Be patient with me, and don't hesitate to ask a lot of questions. I put together a crude video where I create the first couple of classes for the plug-in using Eclipse. See if you can follow my basic steps. I need to do some editing of the video and I need to add some voice-over. But it should help you to get started. You can download a zip file of the video here: http://www.redefinedhorizons.com/shared_files/create_first_plug-in_classes.zip You also need to figure out the steps for our simplification algorithim. If you want do things the correct way, do some research on existing simplification algorithims. Stefan or Martin would be good programmers to ask about this. If you want to do things the way I typically operate whip up the steps to a home grown algorithim and we will tweak it until it works. :] The Sunburned Surveyor P.S. - If we really get cooking on this I'll commit our code to the SurveyOS or JPP SVN so we can work on it together and share it with the other programmers. Have you ever worked with Subclipse? That might be another tutorial video... ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
