atan函数与atan2函数的一点区别
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;

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