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Here is my problem:
I have a bunch of 2D points in a data file on the web server, I would like to transfer the points from the server to the client browser and displayed on his browser. The user needs to have options to zoom(in/out), pan(drag) and select regions of the points on the 2d data canvas.
W.R.T. the scenario above, what is the best way to implement? Can I use javascript + ajax or use java applet? Can I improve the performance by transforming the data points into images and then do the image manipulation instead?
Thanks!
Shumin
I'd use HTML5 and canvas or just a good JavaScript graphing library.
Java applets are 1995 technology. Who cares about dancing teapots anymore?
There are lists of data visualization tools at http://datavisualization.ch/tools/ and https://en.wikipedia.org/wiki/Data_visualization . If you are interested in data visualization and charts, http://reddit.com/r/visualization, http://flowingdata.com/ , and http://visual.ly/ are great resources. Edward Tufte. http://dygraphs.com/ and http://square.github.com/cubism/ [ http://d3js.org/ ] look great. There are a lot of cool data visualizations listed in the D3JS Gallery: https://github.com/mbostock/d3/wiki/Gallery . For example, the http://mbostock.github.com/d3/talk/20111116/iris-splom.html example shows 2D data with extra categorical dimensions.
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I have 1000 images, each of them signifies a state at the time step. I would like to create an application that allows us to use a slider move through time steps, eventually being able also to see some information about what is going on in the image (like region size ect). I created the algorithm which creates generates and analyzes images in Python and I guess I will try to create UI in Java. Any recommendations on how to approach it? ( I am not very proficient in Java but I understand the basics). I attached the general view of what I want it to be below:
Try Tkinter, it is a very easy to use UI creator in python.
https://docs.python.org/3/library/tkinter.html
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I am new to the image processing discipline, currently I am working on an activity to find the path in a given floor plan image using java. I could understand & implement a plain Dijkstra or A star algorithm in java to find the shortest path between nodes that can work on hard coded values for nodes & edges. But I have no idea on how to do the same with image file as input.
I could not find any much detailed or comprehensive solution for this on web surfing. Any idea on how to achieve this. Kindly help.
If the walls on your plan are black, and the space is white, then use the white pixels as the space in which you can search using your algorithms.
be aware that:
The plan images could need some preprocessing, like adjusting brightness/contrast and/or converting into lower resolution picture.
If the plans are more complicated than that, ie. you need to take into account some special signs or structures on them then you need to do more complicated conversion/preprocessing and/or image recognition, using some special tools, maybe even some AI.
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I'm working on a game, and I am using various tilesets. Suppose for example that my tileset is 25x25 (meaning each image is 25px wide by 25px high), and I have 16 images. I can either use one 100x100 image and use the BufferedImage#getSubimage method, or I can create 16 25x25 .png files. The first answer would save on time since I wouldn't need to create the 16 files required, but the second method would be clearer since I can name each of my files something obvious.
I'm mostly worried about performance; is it better to keep several small images in memory, or one large file?
Has anyone tried both methods? If so, which did you find worked best?
People generally go with spritesheets/tilesets as this cuts down on size and it's not really much a performance hit to just grab the image you need based on its position and size. For a 2D game with pixel graphics, performance isn't generally much of a concern anyway.
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I'm fairly new to android programming and have a couple years of university experience in Java. I am planning on writing an app for android that will require me to see what category an item entered belongs.
As an example, if a user inputs 'apple', that data must be placed under a 'fruit' category. So in other words I require a data file that will be able to tell me what category the item is in or alternatively the user can add an item to a category if it is not yet categorised.
I am wondering what would be the best way to store this data. Should I use an xml file, database file, text file or what? It would be necessary to perform look-ups and also insertions.
Thanks in advance
I think this question is more of a personal preference, but I would use XML in this case. You can have the structure predefined with distribution of your app, and modify/write the file at runtime. Its easy to read and understand, and just as easily modified. Simply universal.
Sqlite has its positives in large forms of data, but can be much more complex for something that doesn't need much detail.
<index>
<category name="fruit">
<item>apple</item>
.....
</category>
......
</index>
A simple for loop through the categories, and see if the item is present, else add it.
Hope this helps, happy coding!
Android has SQLite built in...for your purposes I'd go with that.
http://developer.android.com/guide/topics/data/data-storage.html
http://developer.android.com/training/basics/data-storage/index.html
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What are some good data structures for keeping track of agents in a two-dimensional, spatial simulation?
I've seen some references to quadtrees (which I understand) and kd-trees (which I don't understand very well).
I'm looking for something through which an agent can efficiently say, "I know my location, and I would like to know which agents are near me (within a certain radius of myself)."
Examples (pseudo-code is fine) would be greatly appreciated.
I'm working in Java.
Well, I'm not sure exactly how it is implemented, but the MASON toolkit uses a discretization algorithm that places agents that are close to one another in the same "bucket" of a hash table. It makes for very fast lookups, as only a few of these buckets have to be checked for each query.
The best thing for you is probably to take a look at the source code here:
http://code.google.com/p/mason/source/browse/trunk/mason/sim/field/continuous/Continuous2D.java?r=529
I have found something called a Bucket PR Quadtree.