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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标签：x1,y1,float,斜率,k1,计算,x2,y2 From： https://www.cnblogs.com/herd/p/17231817.html