点位测设生成随机数

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//此程序为点位测设随机生成训练使用坐标而设计
//2019.6.2
//设计人：YHJ
//商业使用需授权，最终解释权归设计者本人所有
#include<iostream>
#include<math.h>
#include<unistd.h>
using namespace std;
 
int main()
{
    cout<<"程序说明：使用前提条件需要获取AB线段的准确距离，P点的角度范围，direction='L'(-90~0)/'R'(0~90)/'0'(手动输入角度范围，[-90~90])"<<endl;
    float R(float x0, float y0, float x, float y, float angle, int num);//声明随机生成范围P点坐标函数
     
    float xa, ya, xb, yb, ab=29.740;
    int left_angle = -90, right_angle = 90;
    cout<<endl<<"input distance of AB"<<endl;
    cout<<">>AB = ";//ab已知点距离
    cin>>ab;
    char direction='L';
    cout<<"input direction"<<endl<<">>(L/R/0):";//点P坐标的随机范围，'L'=-90~0，'R'=0~90，'0'为手动输入左右范围
    cin>>direction;
     
     
    if(direction=='0')
    {
        cout<<"input range of angle:"<<endl
        <<">>left angle=";
        cin>>left_angle;
        cout<<">>right angle=";
        cin>>right_angle;
    }
    else if(direction=='L' || direction=='l')
    {
        right_angle=0;
    }
    else if(direction=='R' || direction=='r')
    {
        left_angle=0;
    }
    else
    {
        cout<<"Input Error!"<<endl;
        return 0;
    }
     
    //随机生成A，B坐标
    srand(time(NULL)) ;
    xa=rand()%1000000*0.001+300.0;
    sleep(1);
    srand(time(NULL)) ;
    ya=rand()%1000000*0.001;
    cout<<"A( "<<xa<<" , "<<ya<<" )"<<endl;
     
    sleep(1);
    srand(time(NULL)) ;
    int t=rand()%4+1; //随机象限
    //cout<<t<<endl;
    if(t==1)
    {
        xb=rand()%(int)(ab*1000)*0.001+xa;
        yb=ya+sqrt(pow(ab, 2)-pow((xa-xb), 2));
    }
    if(t==2)
    {
        xb=-rand()%(int)(ab*1000)*0.001+xa;
        yb=ya+sqrt(pow(ab, 2)-pow((xa-xb), 2));
    }
    if(t==3)
    {
        xb=-rand()%(int)(ab*1000)*0.001+xa;
        yb=ya-sqrt(pow(ab, 2)-pow((xa-xb), 2));
    }
    if(t==4)
    {
        xb=rand()%(int)(ab*1000)*0.001+xa;
        yb=ya-sqrt(pow(ab, 2)-pow((xa-xb), 2));
    }
    cout<<"B( "<<xb<<" , "<<yb<<" )"<<endl;
 
    //随机生成P点坐标
    for(int i=0;i<3;i++)
    {
        sleep(1);
        srand(time(NULL)) ;
        float distance=rand()%10000*0.001+10;
        sleep(1);
        srand(time(NULL)) ;
        float angle=(rand()%(right_angle*100-left_angle*100)+(left_angle*100))*0.01;
    cout<<angle<<endl;
        float dx=xb-xa;
        float dy=yb-ya;
        float x_rand=distance*dx/ab+xa;
        float y_rand=distance*dy/ab+ya;
        //cout<<distance<<endl<<angle<<endl;
        R(xa,ya,x_rand,y_rand,angle,i);
    }
    cout<<">>>"<<endl;
    return 0;
}
 
 
float R(float x0, float y0, float x, float y, float angle, int num) //随机生成P点坐标函数
{
        float dx=x-x0;
        float dy=y-y0;
        float x_=dx*cos(angle/180*3.14)-dy*sin(angle/180*3.14)+x0;
        float y_=dx*sin(angle/180*3.14)+dy*cos(angle/180*3.14)+y0;
        cout<<"P"<<num+1<<"( "<<x_<<" , "<<y_<<" )"<<endl;
        return 0;
}