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[LeetCode] Convex Polygon 凸多边形

Given a list of points that form a polygon when joined sequentially, find if this polygon is convex (Convex polygon definition). Note: There are at least 3 and at most 10,000 points. Coordinates are in the range -10,000 to 10,000. You may assume the…

结合谷歌地图多边形(polygon)与Sql Server 2008的空间数据类型计算某个点是否在多边形内的注意事项

首先在利用 GEOGRAPHY::STPolyFromText(@GeoStr, 4326) 这样的函数把字符串转换为Geography类型时,字符串里经纬度的顺序是 “经度[空格]纬度”,即“longitude latitude”. 另外就是从谷歌地图里得到的多边形(polygon)的顶点定义的顺序和Sql Server里Geography类型中的顶点定义顺序是相反的,即一个是顺时针定义,一个是逆时针定义(至于哪个是顺时针,哪个是逆时针,没有细究),所以把这些顶点存到数据库的时候,需要先反转一…

[svg 翻译教程]Polyline（折线）polygon（多边形）

原文: http://tutorials.jenkov.com/svg/polygon-element.html Polyline 虽然说这个 元素我没用过,但是还是蛮强大的,也翻译下 示例 <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <polyline points="0,0 30,0 15,30" st…

[OpenGL][SharpGL]用Polygon Offset解决z-fighting和stitching问题

[OpenGL][SharpGL]用Polygon Offset解决z-fighting和stitching问题 本文参考了(http://www.zeuscmd.com/tutorials/opengl/15-PolygonOffset.php),用SharpGL重写了示例代码,您可以点击文末的链接下载. 什么是stitching和z-fighting 在OpenGL中,如果想绘制一个多边形同时绘制其边界,可是先使用多边形模式GL_FILL绘制物体,然后使用多边形模式GL_LINE和不同的颜色…

WebGIS中基于AGS的画圆查询简析以及通过Polygon来构造圆的算法

文章版权由作者李晓晖和博客园共有,若转载请于明显处标明出处:http://www.cnblogs.com/naaoveGIS/. 1.背景 某个项目需求中需要在前端进行画圆查询,将圆范围上的多边形要素在前端进行展示.因为此项目的环境是AGS环境,考虑使用AGS的I查询来完成. 2.I查询的相关参数介绍 I查询中主要涉及到如下几个参数:geometry.geometryType.layerDefs.layers.tolerance.mapExtent.imageDisplay等. 2.1理解相对简…

【ASC 23】G. ACdream 1429 Rectangular Polygon --DP

题意:有很多棍子,从棍子中选出两个棍子集合,使他们的和相等,求能取得的最多棍子数. 解法:容易看出有一个多阶段决策的过程,对于每个棍子,我们有 可以不选,或是选在第一个集合,或是选在第二个集合 这三种决策.因为两个集合最后的和要相等,那么令一个集合为正,另一个为负,那么最后和为0,我们用偏移0的量来作为状态之一. dp[i][j]表示前 i 个 偏移量为 j 的最大棍子数,因为每根棍最长为200,所以偏移量最多为+-20000,所以在+-20000之间枚举,最多100*40000 代码: #in…

libgdx 裁剪多边形(clip polygon、masking polygon)

直接放例子代码,代码中以任意四边形为例,如果需要做任意多边形,注意libgdx不能直接用ShapeRender填充多边形,需要先切割成三角形. public static void drawClip(Batch batch, Polygon polygon, TextureRegion region, float x, float y) { float[] vertices = polygon.getVertices(); if (shapes == null) { shapes = new S…

Leetcode: Convex Polygon

Given a list of points that form a polygon when joined sequentially, find if this polygon is convex (Convex polygon definition). Note: There are at least 3 and at most 10,000 points. Coordinates are in the range -10,000 to 10,000. You may assume the…

十五、polygon API

How polygons are handled internally The five basic polygonal API classes Construction History and Tweaks polyModifierCmd example splitUVCmd example Poly exporter plug-ins 用来存储polygon(faces,edges,vertices)等部分的基本数据结构,这些数据结构然后被封装到polygonal shape nodes,这…

[javascript svg fill stroke stroke-width points polygon属性讲解] svg fill stroke stroke-width points polygon绘制多边形属性并且演示polyline和polygon区别讲解

<!DOCTYPE html> <html lang='zh-cn'> <head> <title>Insert you title</title> <meta name='description' content='this is my page'> <meta name='keywords' content='keyword1,keyword2,keyword3'> <meta http-equiv="…

svg学习（七）polygon

<polygon> 标签用来创建含有不少于三个边的图形. <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="100%"…

《zw版·Halcon-delphi系列原创教程》 Halcon分类函数012,polygon，多边形

<zw版·Halcon-delphi系列原创教程> Halcon分类函数012,polygon,多边形 为方便阅读,在不影响说明的前提下,笔者对函数进行了简化: :: 用符号“**”,替换:“procedure” :: 用大写字母“X”,替换:“IHUntypedObjectX” :: 省略了字符:“const”.“OleVariant” [示例] 说明 函数: procedure AddNoiseWhiteContourXld( const Contours: IHUntypedObject…

point\polyline\polygon的转化（转）

首先你要明白Polyline是由path对象构成,Polygon是由ring对象构成,因此实现polyline向polygon的转换,思路如下:1.提取polyline中的所有path对象2.将path对象转换成ring对象,由于IRing继承自IPath,因此该转换是合理的3.利用IGeometryCollection.AddGeometry添加ring对象,构成polygon示例如下: //cast the polyline object to the polygon ISegmentCol…

flex polygon 序列化为txt 文本

当我们要把一个地块导出为txt的时候,应该怎么写,这是比较有用的这样可以帮助我们存档之类的,这里是基于某个地方的独立坐标系,是基于自己发布地图,如果是用百度地图或者其他网上的地图可能不适用. package com.szpl.extension.util { import com.esri.ags.geometry.MapPoint; import com.esri.ags.geometry.Polygon; import com.esri.ags.layers.GraphicsLayer; i…

LightOJ 1285 - Drawing Simple Polygon （几何，极角排序）

1285 - Drawing Simple Polygon   PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB Given set of points in the plane, your task is to draw a polygon using the points. You have to use all the points. To be more specific, each po…

Determining if a point lies on the interior of a polygon

Determining if a point lies on the interior of a polygon Written by Paul Bourke  November 1987 Solution 1 (2D) The following is a simple solution to the problem often encountered in computer graphics, determining whether or not a point (x,y) lies ins…

Converting a Polygon ZM shape file to a regular Shape Polygon

from:http://blog.csdn.net/qb371/article/details/8102109 Locate the following tool - ArcToolbox > Conversion Tools > To Shapefile > Feature Class To Shapefile (multiple) Launch the tool and add your Polygon ZM shapefiles to the input features. Sel…

[CareerCup] 7.2 Ants on Polygon 多边形上的蚂蚁

7.2 There are three ants on different vertices of a triangle. What is the probability of collision (between any two or all of them) if they start walking on the sides of the triangle? Assume that each ant randomly picks a direction, with either direc…

ACdream 1429 Rectangular Polygon

Rectangular Polygon Time Limit: 1000MS   Memory Limit: 256000KB   64bit IO Format: %lld & %llu Description A rectangular polygon is a polygon whose edges are all parallel to the coordinate axes. The polygon must have a single, non-intersecting bounda…

[算法]A General Polygon Clipping Library

A General Polygon Clipping Library Version 2.32    http://www.cs.man.ac.uk/~toby/alan/software/gpc.html Alan Murta Advanced Interfaces Group Department of Computer Science University of Manchester Manchester M13 9PL, UK Abstract: This document descri…

[算法]Comparison of the different algorithms for Polygon Boolean operations

Comparison of the different algorithms for  Polygon Boolean operations. Michael Leonov 1998 http://www.angusj.com/delphi/clipper.php#screenshots http://www.complex-a5.ru/polyboolean/comp.html http://www.angusj.com/delphi/clipper.php#screenshots Intro…

[RGEOS]绘制多边形Polygon

绘制OGIS定义的Polygon public void DrawPolygon(Polygon pol, Brush brush, Pen pen, bool clip) { gc = Graphics.FromHwnd(Handle); if (pol.ExteriorRing == null) return; ) { //Use a graphics path instead of DrawPolygon. DrawPolygon has a problem with several in…

poj 1179 Polygon

http://poj.org/problem?id=1179 Polygon Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 5078   Accepted: 2139 Description Polygon is a game for one player that starts on a polygon with N vertices, like the one in Figure 1, where N=4. Each…

计算机学院大学生程序设计竞赛（2015’12）Polygon

Polygon Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 195    Accepted Submission(s): 41 Problem Description Give you a simple polygon and a line, and your task is to calculate the length of t…

【原创】pads layout 画多边形copper，出现Self-Intersecting Polygon，解决办法

在做线性位移传感器的电路板时,需要在一个很小的多边形Copper操作,总是提示“Self-Intersecting Polygon”报错,意思是outline线自身交叉,换句话说就是线宽与多边形尺寸没有协调好.如下图现象: 解决办法: 1.将outline线宽调小,发现不在提示“Self-Intersecting Polygon”错误,但是敷铜变成网格状,如下图. 铜皮网格的现象,其原因是:这个线宽得小于系统设置的Copper Clearance这个值, 1)调整规则设置,Copper Clea…

poj 2007 Scrambled Polygon（极角排序）

http://poj.org/problem?id=2007 Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 6701   Accepted: 3185 Description A closed polygon is a figure bounded by a finite number of line segments. The intersections of the bounding line segments ar…

hdu 4033Regular Polygon(二分+余弦定理)

Regular Polygon Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65768/65768 K (Java/Others)Total Submission(s): 3274    Accepted Submission(s): 996 Problem Description In a 2_D plane, there is a point strictly in a regular polygon with N side…

unity, polygon collider 2D 添加顶点

正常情况下只要按下了Edit Collider按钮,鼠标停在polygon collider 2D的一条边上,就会出现一个虚拟的新顶点,此时如果按下鼠标,新顶点就创建出来了. 但是我今天遇到一个奇怪的情况就是鼠标放到polygon collider 2D的边上,并不出现虚拟新顶点,点击也不会创建新顶点.后来发现,原来是我的gameObject的Scale值太大了,是一千多,而其上添加的polygon collider 2D是常规尺寸,也就是说此polygon collider 2D在gameOb…

ENVI中利用polygon掩膜修改类到指定类

overlay——classification——制定分类的图像 edit——polygon delete from class(选择这个掩膜模式) edit——set delete class value(设置删除后的类别值,比如要把农田变成竹林,就设置为竹林) 将错分的类设置为active class,例如要将农田修改为竹林,这里active class选择(农田).并将要修改的类(竹林)打开编辑模式 修改完后点击File——save change to file保存修改结果…

判断一个面（Polygon）是不是矩形

判断一个面是不是矩形在GIS中很长用的功能,那么怎么判断一个面是不是矩形呢. 这里先要弄懂一些概念,面是什么,先看OGC标准的定义. 我的英文水平有限,(有翻译更好的请留言,如果翻译的准确将被采纳)大概的意思就是一个面(Polygon 后面说的面都指的是Polygon)是平面的,是由1个外边界和0或者多个内边界组成,每个内边界是一个多边形的孔. 这样还是抽象啊,上个图就清醒多了. 上面三个都是面,但是有一些特殊的情况,这里就不做深入讨论了,在不同的GIS框架中也有一点点小区别. 好了我们就判断这…