In "getEventFramesAndReset", it seems the 'rx' and 'ry' are always zero ?

[wtyytw0]

Hi,

In patch.h, the function "getEventFramesAndReset", line 109 ~ 119:
int x = e.x - center_.x + half_size_;
int y = e.y - center_.y + half_size_;
double rx = e.x - center_.x + half_size_ - x;
double ry = e.y - center_.y + half_size_ - y;
It seems the 'rx' and 'ry' are always zero, because you just calculate x as "e.x - center_.x + half_size_" and then calculate the subtraction of x and 'e.x - center_.x + half_size_' as 'rx'. How do I understand the variable 'rx' and 'ry'?

Thank you,
Taoyi