87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
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/**
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* Behavior for bhvTTCPendulum. This is not the pendulum inside the clock in the
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* castle, but rather the one in TTC itself.
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*/
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/**
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* Initial angle acceleration.
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*/
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static f32 sTTCPendulumInitialAccels[] = {
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/* TTC_SPEED_SLOW */ 13.0f,
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/* TTC_SPEED_FAST */ 22.0f,
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/* TTC_SPEED_RANDOM */ 13.0f,
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/* TTC_SPEED_STOPPED */ 0.0f,
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};
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/**
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* Init function for bhvTTCPendulum.
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*/
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void bhv_ttc_pendulum_init(void) {
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if (gTTCSpeedSetting != TTC_SPEED_STOPPED) {
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o->oTTCPendulumAngleAccel = sTTCPendulumInitialAccels[gTTCSpeedSetting];
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o->oTTCPendulumAngle = 6500.0f;
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} else {
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o->oTTCPendulumAngle = 6371.5557f;
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}
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}
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/**
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* Update function for bhvTTCPendulum.
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*/
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void bhv_ttc_pendulum_update(void) {
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if (gTTCSpeedSetting != TTC_SPEED_STOPPED) {
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UNUSED f32 startVel = o->oTTCPendulumAngleVel;
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// Play sound
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if (o->oTTCPendulumSoundTimer != 0) {
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if (--o->oTTCPendulumSoundTimer == 0) {
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cur_obj_play_sound_2(SOUND_GENERAL_PENDULUM_SWING);
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}
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}
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// Stay still for a while
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if (o->oTTCPendulumDelay != 0) {
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o->oTTCPendulumDelay -= 1;
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} else {
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// Accelerate in the direction that moves angle to zero
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if (o->oTTCPendulumAngle * o->oTTCPendulumAccelDir > 0.0f) {
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o->oTTCPendulumAccelDir = -o->oTTCPendulumAccelDir;
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}
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o->oTTCPendulumAngleVel += o->oTTCPendulumAngleAccel * o->oTTCPendulumAccelDir;
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// Ignoring floating point imprecision, angle vel should always be
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// a multiple of angle accel, and so it will eventually reach zero
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//! If the pendulum is moving fast enough, the vel could fail to
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// be a multiple of angle accel, and so the pendulum would continue
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// oscillating forever
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if (o->oTTCPendulumAngleVel == 0.0f) {
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if (gTTCSpeedSetting == TTC_SPEED_RANDOM) {
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// Select a new acceleration
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//! By manipulating this, we can cause the pendulum to reach
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// extreme angles and speeds
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if (random_u16() % 3 != 0) {
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o->oTTCPendulumAngleAccel = 13.0f;
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} else {
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o->oTTCPendulumAngleAccel = 42.0f;
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}
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// Pick a random delay
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if (random_u16() % 2 == 0) {
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o->oTTCPendulumDelay = random_linear_offset(5, 30);
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}
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}
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// Play the sound 15 frames after beginning to move
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o->oTTCPendulumSoundTimer = o->oTTCPendulumDelay + 15;
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}
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o->oTTCPendulumAngle += o->oTTCPendulumAngleVel;
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}
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} else {
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}
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o->oFaceAngleRoll = (s32) o->oTTCPendulumAngle;
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// Note: no platform displacement
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}
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