intersection

What is the best way to find the intersection of two ranges in C++? For example, if I have one range as [1...20] inclusive, and another as [13...45] inclusive, I want to get [13...20], as that is the intersection between them. I thought about using the native set intersection function in C++, but I would first have to convert the range into a set, which would take too much computation time for large values. intersection = { std::max(arg1.min, arg2.min), std::min(arg1.max, arg2.max) }; if (intersection.max < intersection.min) { intersection.markAsEmpty(); } yau For the sake of completeness I

How to extract intersections in the OpenStreetMap？ I need the longitude and latitude of the intersections, thanks! There has been a similar question here . There is no direct API call to retrieve intersections. But you can query all ways in a given bounding box (for example directly via the API or via the Overpass API ) and look for nodes shared by two or more ways as explained in the other answer. Try the GeoNames findNearestIntersectionOSM API: http://api.geonames.org/findNearestIntersectionOSMJSON?lat=37.451&lng=-122.18&username=demo The input is lng and lat of location and the response

I have been coding up a small search engine and need to find out if there is a faster way to find set intersections. Currently, I am using a Sorted linked list as explained in most search engine algorithms. i.e for every word I have a list of documents sorted in a list and then find the intersection among the lists. The performance profiling of the case is here . Any other ideas for a faster set intersection? An efficient way to do it is by "zig-zag": Assume your terms is a list T : lastDoc <- 0 //the first doc in the collection currTerm <- 0 //the first term in T while (lastDoc != infinity):

I was wondering how I would go about mapping 2D screen coordinates to a 3D world (specifically the xz plane) knowing: -position of the camera -equation of the screen plane -equation of the xz plane All I want to do is have the land on the xz plane light up when I hover the mouse over it. Any help is greatly appreciated! Thanks! If your world is rotated and shifted such that the camera is at x=y=z=0 (world coordinates), the world z coordinate increases away from the viewer (into the screen), and the projection plane is parallel to the screen and is at z=d (world coordinate; d > 0 ), then you

In 3D space I am trying to determine if a ray/line intersects a square and if so, the x and y position on the square that it intersects. I have a ray represented by two points: R1 = (Rx1, Ry1, Rz1) and R2 = (Rx2, Ry2, Rz2) And the square is represented by four vertices: S1 = (Sx1, Sy1, Sz1), S2 = (Sx2, Sy2, Sz2), S3 = (Sx3, Sy3, Sz3) and S4 = (Sx4, Sy4, Sz4). I’ve found lots of algebraic equations for this online but none seem to fit this problem exactly. Ideally I would like the answer in Java code, but an equation that I can easily convert to code will do also. All help will be appreciated.