intersection

问题 I wish to draw angle lines over a circle (I change the angles in the script). The plot line I get is 0 angle, why does the script not show me all of them, and how can I fix it? In addition, how can I calculate the intersection points? Script: clc; clear; close all; r=1000; % based on : https://stackoverflow.com/questions/29194004/how-to-plot-a-circle-in-matlab nCircle = 1000; t = linspace(0,2*pi,nCircle); xCircle = 0+ r*sin(t); yCircle = 0+ r*cos(t); line(xCircle,yCircle ); axis equal; hold

问题 For a given rectangle R1 I am trying to find out which are the other rectangles that could intersect with it IF I draw a vectical line segment. The rectangles that intersect with R1 are marked in Red. Every rectangle is characterized by its (top, left) and (bottom, right) coordinates. R1 = [top, left, bottom, right],...,Rn = [top, left, bottom, right] By using the coordinates and the vertical line. I want to find the rectangles that intersects with R1 Solution I found the following library

问题 This is kind of a small issue and I hope you are able to help me. My code is probably rubbish. For an example, I have a file in which the only statement is John is the uncle of Sam . My Perl script should copy the file contents into an array. User should be able to input different names and search if those names are mentioned in the file. There should be an array with relationships like "uncle aunt, mother, father etc" in the program. #use warnings; use Array::Utils qw(:all); print "Please

问题 I want to compute a list "intersection". The problem is: L1 = [1, 0, 2, 3, 1 , 3, 0, 5] L2 = [3, 5] Then the result will be L3 = [0, 0, 0, 1, 0, 1, 0, 1] Then i will convert this result in a byte. In this case will be 21 in decimal format. I want to make in delphi and I need this do efficiently. Is there a way to solve this problem better than O(m*n)? 回答1: Here's a function that should do what you want. I defined L2 as a set instead of an array since you said all your values will fit in a

问题 I posted a version of this question previously but am struggling to get that answer working with this slightly different format of data working...hence i am reaching out again on this. I have the following set of data (note the way to read the data below is ID1, Ford, has the following attributes and values A:B, B:C and C:D +------------------------------------------------+ | ID NAME Attribute Attribute Value | +------------------------------------------------+ | 1 Ford A B | | 1 Ford B C | |

问题 I have written a simple raytracer (the code is here but you don't have to debug it). It can render simple meshes: It looks pretty cool, I think. There is no reflection in the raytracer and the pixels are shaded solely based on their interpolated normals. However, if you zoom up you see that there are rendering artifacts all over it: My question is, what is causing these "dots" on the model? I know it must have something to do with the intersection test because here is the same model rendered

问题 I'm trying set97 <- gIntersection(setbp,d97) and getting the error message: Error in RGEOSBinTopoFunc(spgeom1, spgeom2, byid, id, "rgeos_intersection") : TopologyException: found non-noded intersection between LINESTRING (533036 -314770, 533036 -314770) and LINESTRING (533036 -314780, 533036 -314770) at 533035.88110651996 -314769.97350772272 (setbp is a sector of a county - for census purposes - and d97 is the deforestation in brazilian Amazon up to 1997.) When I do gIsValid(d97) gIsValid

问题 I know how to test intersection between a point and a triangle. ...But i dont get it, how i can move the starting position of the point onto the screen plane precisely by using my mouse coordinates, so the point angle should change depending on where mouse cursor is on the screen, also this should work perfectly no matter which perspective angle i am using in my OpenGL application, so the point angle would be different on different perspective angles... gluPerspective() is the function im

问题 I have two polygons defined as a series of 2D floating point values. They are not guaranteed to be concave or convex. They do not cross over themselves. They cannot rotate. I want to place one randomly inside the other should it be possible based on it's size. The main problem is efficiency. I have to do this about 200 or so times in a few seconds. I've been looking into this for a couple of days now, and have made no discernible headway. Any leads would be appreciated. 回答1: Disclaimer: If

问题 I'm using JAVA. Ellipse2D s1=new Ellipse2D.Float(0,0,100,100); System.out.println(s1.intersects(99, 30, 100, 100)); Should return false but it return true. How to find intersection between 2 ellipse? Thx 回答1: CADEMIA has an useful api which can be downloaded from here. The class cib.util.geo.Geo2D has a method Geo2D#intersection which calculates the intersection points between two ellipses. Hope this will help you. Thanks. 来源： https://stackoverflow.com/questions/6544441/how-ellipse-to-ellipse