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atan函数与atan2函数的一点区别

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Release： 2016-06-07 15:49:32
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atan 和 atan2 都是求反正切函数，如：有两个点 point(x1,y1), 和 point(x2,y2); 那么这两个点形成的斜率的角度计算方法分别是： floatangle = atan( (y2-y1)/(x2-x1) ); 或 float angle = atan2( y2-y1, x2-x1); atan 和 atan2 区别： 1：参数的填写方式不

 atan 和 atan2 都是求反正切函数，如：有两个点 point(x1,y1), 和 point(x2,y2);

那么这两个点形成的斜率的角度计算方法分别是：

float angle = atan( (y2-y1)/(x2-x1) );

或

float angle = atan2( y2-y1, x2-x1 );

 

 atan 和 atan2 区别：

1：参数的填写方式不同；

2：atan2 的优点在于 如果 x2-x1等于0 依然可以计算，但是atan函数就会导致程序出错；

 

结论： atan 和 atan2函数，建议用 atan2函数；

Related labels：
function the difference
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