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Ensures positional continuity across rotation speed changes.

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This commit is contained in:
Thomas Harte 2019-07-25 22:29:54 -04:00
parent 3d20ae47ea
commit d2bfd59953
1 changed files with 4 additions and 3 deletions
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7
Storage/Disk/Drive.cpp
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@ -38,9 +38,10 @@ Drive::Drive(int input_clock_rate, int revolutions_per_minute, int number_of_hea
Drive::Drive(int input_clock_rate, int number_of_heads) : Drive(input_clock_rate, 300, number_of_heads) {}
void Drive::set_rotation_speed(float revolutions_per_minute) {
// TODO: probably I should look into
// whether doing all this with quotients is really a good idea.
rotational_multiplier_ = 60.0f / revolutions_per_minute;
const float new_rotational_multiplier = 60.0f / revolutions_per_minute;
cycles_since_index_hole_ *= new_rotational_multiplier / rotational_multiplier_;
rotational_multiplier_ = new_rotational_multiplier;
cycles_since_index_hole_ %= int(get_input_clock_rate() * rotational_multiplier_);
}
Drive::~Drive() {