2d

I'm looking for a way to programmatically recreate the following effect: Give an input image: input http://www.shiny.co.il/shooshx/ConeCarv/q_input.png I want to iteratively apply the "stroke" effect. The first step looks like this: step 1 http://www.shiny.co.il/shooshx/ConeCarv/q_step1.png The second step like this: alt text http://www.shiny.co.il/shooshx/ConeCarv/q_step2.png And so on. I assume this will involves some kind of edge detection and then tracing the edge somehow. Is there a known algorithm to do this in an efficient and robust way? VonC Basically, a custom algorithm would be,

I have an applet which displays some data using circles and lines. As the data continually changes, the display is updated, which means that sometimes the circles and lines must be erased, so I just draw them in white (my background color) to erase them. (There are a lot of them, so erasing everything and then recomputing and redrawing everything except the erased item would be a horribly slow way to erase a single item.) The logic of the situation is that there are two layers that need to be displayed, and I need to be able to erase an object in one layer without affecting the other layer. I

I need to pass an array of integer arrays (basically a 2 d array )to all the processors from root.I am using MPI in C programs. How to declare MPI datatype for 2 d array.and how to send the message (should i use broadcast or scatter) You'll need to use Broadcast , because you want to send a copy of the same message to every process. Scatter breaks up a message and distributes the chunks between processes. As for how to send the data: the HIndexed datatype is for you. Suppose your 2d array is defined like this: int N; // number of arrays (first dimension) int sizes[N]; // number of elements in