polygon poster

There is an n-sided shape, the vertex is P1,P2,..., pn; Given a known point P, determine whether p is inside or outside the polygon.Preliminary knowledge: The definition of intersection of two segments, if the ends of one segment are at both ends of another segment, the two segments intersectThe two sides of the 2-point segment can be realized with the cross-multiplication of vectors!Basic steps:1, over P point vertical upward as a ray2, determine the intersection of this ray and N edge3, add al

[WebGL entry] 6. vertices and polygon. webgl entry vertices Note: The article is translated from http://wgld.org/, the original author shanbenya (doxas). If I have additional instructions in the article, I will add [lufy:]. In addition, the research on webgl is not in-depth enough, and some professional words are required, if the translation is incorrect, please correct me. Something that can be drawn in a 3D space Anything can be traced in the Web GL

Title Link: http://poj.org/problem?id=2007DescriptionA closed polygon is a figure bounded by a finite number of line segments. The intersections of the bounding line segments is called the vertices of the polygon. When one starts at any vertex of a closed polygon and traverses each bounding line segment exactly once, one comes back to The starting vertex.A closed

Question link: http://poj.org/problem? Id = 3335 This question is to give you a polygon, so that you can determine whether there is a point (or an area) inside the polygon so that you can observe all the places inside the polygon as long as it is inside the area. The edges of a polygon are not transparent; A well-unde

Sutherland-hotman Algorithm The Sutherland-hodman algorithm is also called the edge-by-edge cropping method, which was proposed by sastherland (I. e. Sutherland) and hodman in 1974. This algorithm adopts the segmentation and edge-based cropping methods. I. Basic Ideas: Crop a polygon with an edge of the window at a time. Consider the cropping line composed of an edge of the window and the extension line. The line divides the plane into two parts: visi

Label: style blog HTTP color Io OS ar Java sp I. Application Scenario: the map application determines whether a location is in a region. I used Baidu map and implemented the code as Js. As far as I know, Baidu map API already provides this function. Ii. Overview: 1. the boundary of the administrative area is a polygon. 2. polygon is divided into Convex Polygon an

Original source: http://www.html-js.com/article/1517 This article is based on a microblog that I saw a few days ago HTTP://WEIBO.COM/1057676857/ADPFWWFSV I don't agree with the PO Master's remarks. I have studied chemistry, I have not studied the course of computer science, but intuitively I think this should also be a kind of common problem in computer graphics. And I think this does not need how high-end computer expertise, as long as the middle school mathematics not all back to the teache

1. Angle and discriminant method (for freeform polygon) Double angle = 0; Realpointlist::iterator iter1 = Points.begin (); for (Realpointlist::iterator Iter2 = (iter1 + 1); Iter2 { Double x1 = (*iter1). x-p.x; Double y1 = (*iter1). y-p.y; Double x2 = (*iter2). x-p.x; Double y2 = (*iter2). y-p.y; Angle + = angle2d (x1, y1, x2, y2); } if (Fabs (angle-span::P I2) else return false; Alternatively, you can use bounding box to speed up. if (P.x p.x > (*i

Class relationship{Static void main (string [] ARGs){// Vector2d point1 = new vector2d (39.909209536859834, 116.3225715637207); // inVector2d point1 = new vector2d (39.901045, 116.415596); // outVector2d cpoint = new vector2d (39.909209536859834, 116.3225715637207 );Console. writeline ("Whether the vertex is in the circle:" + whether the vertex is in the circle (cpoint, 8000, point1 ));Console. writeline ("Whether the vertex is in the circle:" + whether the vertex is in the circle (cpoint, new v

anything about Virtual Earth development before, I tried to describe it simpler. From the common sense, each polygon should have some basic attributes, such as fill color, border, transparency, and so on. Similarly, we need to define these attributes when initializing a polygon instance. Fill-How to fill a polygon? It is a brush object. Stroke-What is the bor

The relationship between points and polygon through the corner method is known to all. The principle is relatively simple. The angle swept inside the polygon must be 360 degrees, but not necessarily on the boundary and outside.It is also difficult to implement, and the floating point error is large, and some special cases should be considered.I found an algorithm called the improved arc-length method on the

http://blog.csdn.net/ACMaker/archive/2008/10/29/3176910.aspx http://cgm.cs.mcgill.ca/~orm/rotcal.frame.html History: In 1978, the paper "Computational Geometry", M.i Shamos's Ph.D, marked the birth of this field of computer science. What he was doing was a very simple algorithm for finding the diameter of a convex polygon, which is determined by the maximum value of a pair of points of a polygon.Later, the diameter evolved to be determined by a pai

Write a C language experiment to use an algorithm to determine whether a point is within the polygon. The code for C is as follows: int pnpoly (int nvert, float *vertx, float *verty, float testx, float testy) { int I, j, C = 0; for (i = 0, j = nvert-1; i if ((verty[i]>testy)! = (verty[j]>testy)) (Testx (ver TY[J] -verty[i]) + vertx[i])) c =! C; return C;} Where the Nvert is the number of

to pass the value This method is mainly referred to http://www.cnblogs.com/Anders888/p/3542288.html this article, the final problem resolution, the code is as follows: Here Sdogeometry, Sdopoint have been encapsulated, can refer to http://blog.csdn.net/rrrrssss00/article/details/22879719 The final parameters are used: Single pointString wkt = "point (63918.6936862222 39311.6724619204)";String conn_str = "Data source=orcl162; User ID = gttest; Password = Gttest ";//String connecting the Oracle D

Sutherland-hodgman Polygon Clipping algorithm of CGA clipping algorithmThe Sutherland-hodgman algorithm is also called edge trimming, and the algorithm is Sasserande (i. E. Sutherland) and Trautman (Hodgman) were introduced in 1974.This algorithm adopts the method of segmentation processing and Edge cutting . This algorithm is suitable for the clipping of any convex or concave, or planar or non-planar polygon