应用上下测试来查找点相对于直线的位置的 C++ 程序
这是一个 C++ 程序,用于应用上下测试来查找点相对于线的位置。对于平面上的任何点 t (xt, yt),它相对于连接 m 和 n 的线 L 的位置是通过计算标量 s 找到的 -
Y = A xt + B yt + C
如果 Y<0,t 位于 L 的顺时针半平面内;如果 Y>0,则 t 位于逆时针半平面上;如果 Y= 0,则 t 位于 L 上。
算法
BeginTake the points as input.
For generating equation of the line, generate random numbers for coefficient of x and y (x1,x2,y1,y2) by using rand function at every time of compilation.
Compute s as (y2 - y1) * x + (x1 - x2) * y + (x2 * y1 - x1 * y2).
if (s < 0)
Print "The point lies below the line or left side of the line".
else if (s >0)
print "The point lies above the line or right side of the line";
else
print "The point lies on the line"
End
示例代码
#include<stdlib.h>输出结果#include<iostream>
#include<math.h>
#include<time.h>
using namespace std;
const int L = 0;
const int H= 20;
int main(int argc, char **argv) {
time_t seconds;
time(&seconds);
srand((unsigned int) seconds);
int x1, x2, y1, y2;
x1 = rand() % (H - L + 1) + L;
x2 = rand() % (H - L + 1) + L;
y1 = rand() % (H - L + 1) + L;
y2 = rand() % (H - L + 1) + L;
cout << "The Equation of the 1st line is : (" << (y2 - y1) << ")x+(" << (x1 - x2) << ")y+(" << (x2 * y1 - x1 * y2) << ") = 0\n";
int x, y;
cout << "\nEnter the point:";
cin >>x;
cin >>y;
int s = (y2 - y1) * x + (x1 - x2) * y + (x2 * y1 - x1 * y2);
if (s < 0)
cout << "The point lies below the line or left side of the line";
else if (s >0)
cout << "The point lies above the line or right side of the line";
else
cout << "The point lies on the line";
return 0;
}
The Equation of the 1st line is : (7)x+(0)y+(-105) = 0Enter the point:7
6
The point lies below the line or left side of the line
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