35 lines
756 B
C++
35 lines
756 B
C++
// src/timing/speed_controller.cpp
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#include "speed_controller.h"
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void SpeedController::set_ground_speed(int spd) {
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if (spd < 0) spd = 0;
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if (spd > 30) spd = 30;
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ground_speed = spd;
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}
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int SpeedController::frame_advance_for(int object_speed, int tick_counter) const {
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if (object_speed <= 0) {
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return 0;
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}
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if (ground_speed == 0) {
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return 1 + object_speed;
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}
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const int delta = object_speed - ground_speed;
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if (delta > 0) {
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return 1 + delta;
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}
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if (delta == 0) {
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return 1;
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}
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float ratio_f = static_cast<float>(ground_speed) / object_speed;
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int ratio = static_cast<int>(ratio_f + 0.3f);
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if (ratio < 1) ratio = 1;
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return (tick_counter % ratio == 0) ? 1 : 0;
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}
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