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MorsGames
GitHub Repository: MorsGames/sm64plus
 Path: blob/master/src/game/behaviors/butterfly.inc.c
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// butterfly.c.inc

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void bhv_butterfly_init(void) {

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    cur_obj_init_animation(1);

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    o->oButterflyYPhase = random_float() * 100.0f;

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    o->header.gfx.animInfo.animFrame = random_float() * 7.0f;

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    o->oHomeX = o->oPosX;

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    o->oHomeY = o->oPosY;

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    o->oHomeZ = o->oPosZ;

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}

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// sp28 = speed

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void butterfly_step(s32 speed) {

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    struct FloorGeometry *sp24;

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    s16 yaw = o->oMoveAngleYaw;

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    s16 pitch = o->oMoveAnglePitch;

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    s16 yPhase = o->oButterflyYPhase;

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    f32 floorY;

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    o->oVelX = sins(yaw) * (f32) speed;

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    o->oVelY = sins(pitch) * (f32) speed;

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    o->oVelZ = coss(yaw) * (f32) speed;

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    o->oPosX += o->oVelX;

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    o->oPosZ += o->oVelZ;

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    if (o->oAction == BUTTERFLY_ACT_FOLLOW_MARIO)

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        o->oPosY -= o->oVelY + coss((s32)(yPhase * 655.36)) * 20.0f / 4;

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    else

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        o->oPosY -= o->oVelY;

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    floorY = find_floor_height_and_data(o->oPosX, o->oPosY, o->oPosZ, &sp24);

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    if (o->oPosY < floorY + 2.0f)

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        o->oPosY = floorY + 2.0f;

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    o->oButterflyYPhase++;

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    if (o->oButterflyYPhase >= 101)

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        o->oButterflyYPhase = 0;

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}

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void butterfly_calculate_angle(void) {

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    gMarioObject->oPosX += 5 * o->oButterflyYPhase / 4;

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    gMarioObject->oPosZ += 5 * o->oButterflyYPhase / 4;

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    obj_turn_toward_object(o, gMarioObject, 16, 0x300);

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    gMarioObject->oPosX -= 5 * o->oButterflyYPhase / 4;

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    gMarioObject->oPosZ -= 5 * o->oButterflyYPhase / 4;

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    gMarioObject->oPosY += (5 * o->oButterflyYPhase + 0x100) / 4;

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    obj_turn_toward_object(o, gMarioObject, 15, 0x500);

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    gMarioObject->oPosY -= (5 * o->oButterflyYPhase + 0x100) / 4;

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}

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void butterfly_act_rest(void) {

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    if (is_point_within_radius_of_mario(o->oPosX, o->oPosY, o->oPosZ, 1000)) {

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        cur_obj_init_animation(0);

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        o->oAction = BUTTERFLY_ACT_FOLLOW_MARIO;

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        o->oMoveAngleYaw = gMarioObject->header.gfx.angle[1];

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    }

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}

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void butterfly_act_follow_mario(void) {

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    butterfly_calculate_angle();

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    butterfly_step(7);

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    if (!is_point_within_radius_of_mario(o->oHomeX, o->oHomeY, o->oHomeZ, 1200))

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        o->oAction = BUTTERFLY_ACT_RETURN_HOME;

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}

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void butterfly_act_return_home(void) {

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    f32 homeDistX = o->oHomeX - o->oPosX;

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    f32 homeDistY = o->oHomeY - o->oPosY;

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    f32 homeDistZ = o->oHomeZ - o->oPosZ;

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    s16 hAngleToHome = atan2s(homeDistZ, homeDistX);

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    s16 vAngleToHome = atan2s(sqrtf(homeDistX * homeDistX + homeDistZ * homeDistZ), -homeDistY);

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    o->oMoveAngleYaw = approach_s16_symmetric(o->oMoveAngleYaw, hAngleToHome, 0x800);

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    o->oMoveAnglePitch = approach_s16_symmetric(o->oMoveAnglePitch, vAngleToHome, 0x50);

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    butterfly_step(7);

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    if (homeDistX * homeDistX + homeDistY * homeDistY + homeDistZ * homeDistZ < 144.0f) {

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        cur_obj_init_animation(1);

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        o->oAction = BUTTERFLY_ACT_RESTING;

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        o->oPosX = o->oHomeX;

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        o->oPosY = o->oHomeY;

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        o->oPosZ = o->oHomeZ;

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    }

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}

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void bhv_butterfly_loop(void) {

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    switch (o->oAction) {

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        case BUTTERFLY_ACT_RESTING:

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            butterfly_act_rest();

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            break;

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        case BUTTERFLY_ACT_FOLLOW_MARIO:

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            butterfly_act_follow_mario();

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            break;

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        case BUTTERFLY_ACT_RETURN_HOME:

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            butterfly_act_return_home();

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            break;

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    }

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    set_object_visibility(o, 3000);

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}

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