Cos(90) returning a value very close to 0, but I need 0?

Question

The values for temp_x_btm_left = 0 & temp_y_btm_left=1;

angle = 90;

//Moving the bottom left coordinates
_btm_left.real() = (temp_x_btm_left * cos(angle         


        

Answer 1

Pre-calculate your angle calculations, then use the results. Something like:

if (angle == 90) {
  cos_angle = 0
} else {
  cos_angle = cos(angle)
}
...
_btm_left.real() = ... * cos_angle ...

This has the additional benefit of doing fewer calls to cos() and sin().

Keep in mind that if angle is a float, doing something like angle == 90 could always return false, because of how floating point numbers are represented internally. You might want to change that to something like:

if (abs(angle-90) < some_small_number) {