poj2074（求直线的交点）

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poj1269 (叉积求直线的交点)

题目链接:https://vjudge.net/problem/POJ-1269 题意:给出4个顶点,表示两条直线,求这两条直线的相交情况,重合输出LINE,平行输出NONE,相交于一点输出该点的距离. 思路: 用叉积判断直线的重合和平行,并且可以用叉积求相交直线的交点. 用叉积求直线交点的模板: double t=((a-c)^(c-d))/((a-b)^(c-d)); ans=Point(a.x+(b.x-a.x)*t,a.y+(b.y-a.y)*t) 证明见https://www.cnbl…

poj2074（求直线的交点）

题目链接:https://vjudge.net/problem/POJ-2074 题意:给定L1(Housing Line),L2(properity line),和一些L[i](obstructions line),求L2最长连续区间,使得在该区间能够完整地看见L1(视线不被L[i]遮挡). 思路: 简单几何题.对L[i],计算其遮挡的区间,假设Line( L1.e , L[i].s )和L2交点的横坐标为t1,Line( L1.s , L[i].e )和L2交点的横坐标为t2,那么L[i]遮…

hdu 2857:Mirror and Light（计算几何，点关于直线的对称点，求两线段交点坐标）

Mirror and Light Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 650 Accepted Submission(s): 316 Problem Description The light travels in a straight line and always goes in the minimal path b…

UVa 11437:Triangle Fun（计算几何综合应用，求直线交点，向量运算，求三角形面积）

Problem ATriangle Fun Input: Standard Input Output: Standard Output In the picture below you can see a triangle ABC. Point D, E and F divides the sides BC, CA and AB into ratio 1:2 respectively. That is CD=2BD, AE=2CE and BF=2AF. A, D; B, E and C, F…

POJ_1269_Intersecting Lines_求直线交点

POJ_1269_Intersecting Lines_求直线交点 Description We all know that a pair of distinct points on a plane defines a line and that a pair of lines on a plane will intersect in one of three ways: 1) no intersection because they are parallel, 2) intersect in…

MATLAB—求直线或者线段之间的交点坐标

function CrossPoint( ) %% 求两条直线的交点坐标 x1 = [7.8 8]; y1 = [0.96 0.94]; %line2 x2 = [8.25 8.25]; y2 = [0 0.99]; %fit linear polynomial p1 = polyfit(x1,y1,1); p2 = polyfit(x2,y2,1); %calculate intersection x_intersect = fzero(@(x) polyval(p1-p2,x),3); y_…