polygon diamonds

Address: http://blog.csdn.net/sun_shine_/article/details/18799739 Given the vertex coordinates (ordered) of a polygon, how do you obtain the area of the polygon?We know that any polygon can be divided into N triangles. Therefore, if we take this as the breakthrough point, the first step is to divide the given polygon i

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

Area DescriptionBeing well known for its highly innovative products, Merck wocould definitely be a good target for industrial espionage. to protect its brand-new research and development facility the company has installed the latest system of surveillance robots patrolling the area. these robots move along the walls of the facility and report suspicous observations to the Central Security Office. the only flaw in the system a competitor using agent cocould find is the fact that the robots radio

Scrambled Polygon Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 7799 Accepted: 3707 DescriptionA 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

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

How can I determine whether a point is inside a polygon? (1) area and discriminant method: determine the area of the triangle formed by the target point and each side of the polygon and whether it is equal to the polygon. If it is equal, it is inside the polygon. (2) angle and discriminant method: Determine the angle b

　　What are 3D polygon features?A polygon feature is a GIS object whose geographic representation (a series of x-and y-coordinate pairs for enclosing areas) is stored in a row of the database as one of its properties (or fields). Polygon features have two separate parts that may be used for modeling in 3D mode: their outer perimeter lines and inner areas. In almos

Given two Convex Polygon that are not connected (that is, not intersecting)PAndQTo find the point at the minimum distance between them (P,Q)(PBelongPAndQBelongQ). In fact, polygon do not intersect, because the polygon we call contains all vertices inside it. If the polygon intersect, the minimum distance becomes meanin

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

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

Three basic types of elements: point, line segment, and polygon. Other complex objects are built by these three elements. Point Void glpointsize (glfloat size) // set the point size state variable in pixels. The default value is 1.0. Note: glpointsize () cannot be placed between glbegin () and glend () functions. Straight Line When glbegin (mode) draws a straight line, the mode value can be: Gl_lines: draw a line segment between each two consecutive

Bing Maps Silverlight Control allows you to customize Polygon images, including triangles, rectangles (rectangles, diamond), and other Polygon images. A polygon is a regular Graph composed of multiple edges. For example, a triangle is composed of three edges, to draw a triangle on a map, we need to know the coordinate values (precision and latitude) of the three

Recently, I helped someone solve a problem. How can I determine whether a coordinate point is in a polygon area (two-dimensional ). I searched for a circle on the Internet and wrote my own code. There are multiple algorithms, such as convex polygon and concave polygon. In short, this is troublesome. Continue searching and learn that there are ready-made class fu

Now, a lot of people are using geometric artboards. As we all know, geometric artboards are excellent geometrical drawing software, we can draw various geometries with geometric artboards. The Toolbox contains basic drawing tools, and the following tutorial details how to use the Geometry artboard polygon tool. The default state of the Polygon tool is to draw the internal tools of the

In the GIS system often use some cutting method, first recommend a very useful space analysis JavaScript library--turf.js, not only powerful, easy to use, but also fast processing speed.The clipping method for a polygon in turf.js is to use a polygon to crop the polygon, but it is not sufficient to use the line to cut the pol