计算斜率k

计算斜率k

 

double calculate_k(float x1,float y1,float x2,float y2)
{
    double k1 = 0.00001;

    if (x1 == x2 && y1 == y2)//1.共位
    {
        k1 = 0.00001;
    }
    else if (x1 == x2 && y1 != y2) //2.共X
    {
        k1 = 0.00001;
    }
    else if (x1 != x2 && y1 == y2) //3.共Y
    {
        k1 = 1.0000;
    }
    else              //4.共斜率
    {
        
        k1 = (y2 - y1) / (x2 - x1);
    }

    return k1;
}

 

 

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