I'm trying to determine a fast way of storing a set of objects, each of which have an x and y coordinate value, such that I can quickly retrieve all objects within a certain rectangle or circle. For small sets of objects (~100) the naive approach of simply storing them in a list, and iterating through it, is relatively quick. However, f...
Hi everyone, I have been looking for a quadtree/quadtree node implementation on the net for ages. There is some basic stuff but nothing that I would be able to really use it a game. My purpose is to store objects in a game for processing things such as collision detection. I am not 100% certain that a quadtree is the best data structure...
I want to create a large database of GPS coordinates that can be queried by saying "Return all coordinates that are within 'n' metres of [this coordinate]". I would like to know how to implement Quadtree Indexing in Sqlserver2008? I want to write a .net module that calls the query which uses quad tree so that i can retrieve the objects...
hi! i have the following quadtree-like structure, in which each cell can either be a inner node or a leaf. if it is a leaf, it can store a color. if it is a inner node, it stores pointers to four children (which can be either leaf or inner node): class RenderBucketCell{ public: RenderBucketCell(); RenderBucketCell(float R, floa...
Hi, I am trying to implement a quadtree of rectangles (instead of points) to be used for collision detection. For some reason, overlap/intersection/collision is not always detected. I suspect this has something to do with the way an inserted collider looks for nearby colliders (see the "COLLISION A" and "COLLISION B" sections of Quadtr...
2D spatial indexing question: What do you call a data structure that is essentially an infinite* quadtree whose nodes contain neither absolute coordinates nor absolute scales -- in which the coordinate system of each node has been normalized to the unit square (0,0)-(1,1), and in which the top-level node is not fixed absolutely? It's a...
I have a panel that is filled with a large number of circles (Ellipse2D). The circles are stored in a 2 dimensional array (rows and columns). My goal is to be able to "paint" the circles as I drag the mouse over them. I will eventually want to use selection shapes that will change the color of all the circles contained within the selec...
It appears that a certain project of mine will require the use of quad-trees, something that I have never worked with before. From what I have read they should allow substantial performance enhancements than a brute-force attempt at the problem would yield. Are any of these python modules any good? Quadtree 0.1.2 <= No: unable to execu...
I'm attempting to use a quadtree (a 4-ary tree) to hold the information in a given BMP. I'm struggling to figure out how to build the tree given any BMP. Basically the structure is such that every leaf represents a pixel. Each Node has 4 pointers each of which point to one of the four remaining quadrants in the image. Thus each node d...
I've implemented a working QuadTree. It subdivides 2-d space in order to accomodate items, identified by their bounding box (x,y,width,height) on the smallest possible quad (up to a minimum area). My code is based on this implementation (mine is in Lua instead of C#) : http://www.codeproject.com/KB/recipes/QuadTree.aspx I've been able ...
Hi everyone, I have a problem: Given an array nxm that contains 0's or 1's, I need group the 0 values into rectangles. At the beginning, I was used a simple quadtree, but different nodes in the same level of the tree have the same value. I'm not totally sure if the R-tree works for my problem or another data structure because I just will...
How can I go about creating a quadtree in PHP, is it even possible? I would like a "grid like" layout. So each "node" has 4 "exits" - north, south, east and west. Does anyone have some sample PHP code of a Quadtree because I couldn't find any documentation specifically for PHP :( I'll be your best friend... (possibly some Rep in th...
I'm writing an integer-based quadtree structure which builds up from the node, and not down. To do this, I need to discover the next largest node which contains all my elements. If I have a preexisting node defined, then try to add an item outside of that node's bounds, it needs to create a larger node to encompass them both. I have (wha...
I have a database of 20k+ cities with latitude and longitude and I need to make lot of nearest point queries (which city is the nearest to certain lat,long point) against this dataset. I guess an R-Tree or QuadTree would be a perfect data structure for this, but I haven't been able to find a working ruby implementation. Do you know any...