godot/scene/animation/tween.cpp

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/**************************************************************************/
/* tween.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
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#include "tween.h"
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#include "scene/animation/easing_equations.h"
#include "scene/main/node.h"
#include "scene/resources/animation.h"
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#define CHECK_VALID() \
ERR_FAIL_COND_V_MSG(!valid, nullptr, "Tween invalid. Either finished or created outside scene tree."); \
ERR_FAIL_COND_V_MSG(started, nullptr, "Can't append to a Tween that has started. Use stop() first.");
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Tween::interpolater Tween::interpolaters[Tween::TRANS_MAX][Tween::EASE_MAX] = {
{ &linear::in, &linear::in, &linear::in, &linear::in }, // Linear is the same for each easing.
{ &sine::in, &sine::out, &sine::in_out, &sine::out_in },
{ &quint::in, &quint::out, &quint::in_out, &quint::out_in },
{ &quart::in, &quart::out, &quart::in_out, &quart::out_in },
{ &quad::in, &quad::out, &quad::in_out, &quad::out_in },
{ &expo::in, &expo::out, &expo::in_out, &expo::out_in },
{ &elastic::in, &elastic::out, &elastic::in_out, &elastic::out_in },
{ &cubic::in, &cubic::out, &cubic::in_out, &cubic::out_in },
{ &circ::in, &circ::out, &circ::in_out, &circ::out_in },
{ &bounce::in, &bounce::out, &bounce::in_out, &bounce::out_in },
{ &back::in, &back::out, &back::in_out, &back::out_in },
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{ &spring::in, &spring::out, &spring::in_out, &spring::out_in },
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};
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void Tweener::set_tween(const Ref<Tween> &p_tween) {
tween = p_tween;
}
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void Tweener::clear_tween() {
tween.unref();
}
void Tweener::_bind_methods() {
ADD_SIGNAL(MethodInfo("finished"));
}
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bool Tween::_validate_type_match(const Variant &p_from, Variant &r_to) {
if (p_from.get_type() != r_to.get_type()) {
// Cast r_to between double and int to avoid minor annoyances.
if (p_from.get_type() == Variant::FLOAT && r_to.get_type() == Variant::INT) {
r_to = double(r_to);
} else if (p_from.get_type() == Variant::INT && r_to.get_type() == Variant::FLOAT) {
r_to = int(r_to);
} else {
ERR_FAIL_V_MSG(false, "Type mismatch between initial and final value: " + Variant::get_type_name(p_from.get_type()) + " and " + Variant::get_type_name(r_to.get_type()));
}
}
return true;
}
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void Tween::_start_tweeners() {
if (tweeners.is_empty()) {
dead = true;
ERR_FAIL_MSG("Tween without commands, aborting.");
}
for (Ref<Tweener> &tweener : tweeners.write[current_step]) {
tweener->start();
}
}
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void Tween::_stop_internal(bool p_reset) {
running = false;
if (p_reset) {
started = false;
dead = false;
total_time = 0;
}
}
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Ref<PropertyTweener> Tween::tween_property(const Object *p_target, const NodePath &p_property, Variant p_to, double p_duration) {
ERR_FAIL_NULL_V(p_target, nullptr);
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CHECK_VALID();
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Vector<StringName> property_subnames = p_property.get_as_property_path().get_subnames();
if (!_validate_type_match(p_target->get_indexed(property_subnames), p_to)) {
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return nullptr;
}
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Ref<PropertyTweener> tweener = memnew(PropertyTweener(p_target, property_subnames, p_to, p_duration));
append(tweener);
return tweener;
}
Ref<IntervalTweener> Tween::tween_interval(double p_time) {
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CHECK_VALID();
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Ref<IntervalTweener> tweener = memnew(IntervalTweener(p_time));
append(tweener);
return tweener;
}
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Ref<CallbackTweener> Tween::tween_callback(const Callable &p_callback) {
CHECK_VALID();
Ref<CallbackTweener> tweener = memnew(CallbackTweener(p_callback));
append(tweener);
return tweener;
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}
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Ref<MethodTweener> Tween::tween_method(const Callable &p_callback, const Variant p_from, Variant p_to, double p_duration) {
CHECK_VALID();
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if (!_validate_type_match(p_from, p_to)) {
return nullptr;
}
Ref<MethodTweener> tweener = memnew(MethodTweener(p_callback, p_from, p_to, p_duration));
append(tweener);
return tweener;
}
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void Tween::append(Ref<Tweener> p_tweener) {
p_tweener->set_tween(this);
if (parallel_enabled) {
current_step = MAX(current_step, 0);
} else {
current_step++;
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}
parallel_enabled = default_parallel;
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tweeners.resize(current_step + 1);
tweeners.write[current_step].push_back(p_tweener);
}
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void Tween::stop() {
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_stop_internal(true);
}
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void Tween::pause() {
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_stop_internal(false);
}
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void Tween::play() {
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ERR_FAIL_COND_MSG(!valid, "Tween invalid. Either finished or created outside scene tree.");
ERR_FAIL_COND_MSG(dead, "Can't play finished Tween, use stop() first to reset its state.");
running = true;
}
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void Tween::kill() {
running = false; // For the sake of is_running().
dead = true;
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}
bool Tween::is_running() {
return running;
}
bool Tween::is_valid() {
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return valid;
}
void Tween::clear() {
valid = false;
for (List<Ref<Tweener>> &step : tweeners) {
for (Ref<Tweener> &tweener : step) {
tweener->clear_tween();
}
}
tweeners.clear();
}
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Ref<Tween> Tween::bind_node(const Node *p_node) {
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ERR_FAIL_NULL_V(p_node, this);
bound_node = p_node->get_instance_id();
is_bound = true;
return this;
}
Ref<Tween> Tween::set_process_mode(TweenProcessMode p_mode) {
process_mode = p_mode;
return this;
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}
Tween::TweenProcessMode Tween::get_process_mode() {
return process_mode;
}
Ref<Tween> Tween::set_pause_mode(TweenPauseMode p_mode) {
pause_mode = p_mode;
return this;
}
Tween::TweenPauseMode Tween::get_pause_mode() {
return pause_mode;
}
Ref<Tween> Tween::set_parallel(bool p_parallel) {
default_parallel = p_parallel;
parallel_enabled = p_parallel;
return this;
}
Ref<Tween> Tween::set_loops(int p_loops) {
loops = p_loops;
return this;
}
int Tween::get_loops_left() const {
if (loops <= 0) {
return -1; // Infinite loop.
} else {
return loops - loops_done;
}
}
Ref<Tween> Tween::set_speed_scale(float p_speed) {
speed_scale = p_speed;
return this;
}
Ref<Tween> Tween::set_trans(TransitionType p_trans) {
default_transition = p_trans;
return this;
}
Tween::TransitionType Tween::get_trans() {
return default_transition;
}
Ref<Tween> Tween::set_ease(EaseType p_ease) {
default_ease = p_ease;
return this;
}
Tween::EaseType Tween::get_ease() {
return default_ease;
}
Ref<Tween> Tween::parallel() {
parallel_enabled = true;
return this;
}
Ref<Tween> Tween::chain() {
parallel_enabled = false;
return this;
}
bool Tween::custom_step(double p_delta) {
bool r = running;
running = true;
bool ret = step(p_delta);
running = running && r; // Running might turn false when Tween finished.
return ret;
}
bool Tween::step(double p_delta) {
if (dead) {
return false;
}
if (is_bound) {
Node *node = get_bound_node();
if (node) {
if (!node->is_inside_tree()) {
return true;
}
} else {
return false;
}
}
if (!running) {
return true;
}
if (!started) {
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if (tweeners.is_empty()) {
String tween_id;
Node *node = get_bound_node();
if (node) {
tween_id = vformat("Tween (bound to %s)", node->is_inside_tree() ? (String)node->get_path() : (String)node->get_name());
} else {
tween_id = to_string();
}
ERR_FAIL_V_MSG(false, tween_id + ": started with no Tweeners.");
}
current_step = 0;
loops_done = 0;
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total_time = 0;
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_start_tweeners();
started = true;
}
double rem_delta = p_delta * speed_scale;
bool step_active = false;
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total_time += rem_delta;
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#ifdef DEBUG_ENABLED
double initial_delta = rem_delta;
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bool potential_infinite = false;
#endif
while (rem_delta > 0 && running) {
double step_delta = rem_delta;
step_active = false;
for (Ref<Tweener> &tweener : tweeners.write[current_step]) {
// Modified inside Tweener.step().
double temp_delta = rem_delta;
// Turns to true if any Tweener returns true (i.e. is still not finished).
step_active = tweener->step(temp_delta) || step_active;
step_delta = MIN(temp_delta, step_delta);
}
rem_delta = step_delta;
if (!step_active) {
emit_signal(SNAME("step_finished"), current_step);
current_step++;
if (current_step == tweeners.size()) {
loops_done++;
if (loops_done == loops) {
running = false;
dead = true;
emit_signal(SNAME("finished"));
break;
} else {
emit_signal(SNAME("loop_finished"), loops_done);
current_step = 0;
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_start_tweeners();
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#ifdef DEBUG_ENABLED
if (loops <= 0 && Math::is_equal_approx(rem_delta, initial_delta)) {
if (!potential_infinite) {
potential_infinite = true;
} else {
// Looped twice without using any time, this is 100% certain infinite loop.
ERR_FAIL_V_MSG(false, "Infinite loop detected. Check set_loops() description for more info.");
}
}
#endif
}
} else {
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_start_tweeners();
}
}
}
return true;
}
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bool Tween::can_process(bool p_tree_paused) const {
if (is_bound && pause_mode == TWEEN_PAUSE_BOUND) {
Node *node = get_bound_node();
if (node) {
return node->is_inside_tree() && node->can_process();
}
}
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return !p_tree_paused || pause_mode == TWEEN_PAUSE_PROCESS;
}
Node *Tween::get_bound_node() const {
if (is_bound) {
return Object::cast_to<Node>(ObjectDB::get_instance(bound_node));
} else {
return nullptr;
}
}
double Tween::get_total_time() const {
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return total_time;
}
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real_t Tween::run_equation(TransitionType p_trans_type, EaseType p_ease_type, real_t p_time, real_t p_initial, real_t p_delta, real_t p_duration) {
if (p_duration == 0) {
// Special case to avoid dividing by 0 in equations.
return p_initial + p_delta;
}
interpolater func = interpolaters[p_trans_type][p_ease_type];
return func(p_time, p_initial, p_delta, p_duration);
}
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Variant Tween::interpolate_variant(const Variant &p_initial_val, const Variant &p_delta_val, double p_time, double p_duration, TransitionType p_trans, EaseType p_ease) {
ERR_FAIL_INDEX_V(p_trans, TransitionType::TRANS_MAX, Variant());
ERR_FAIL_INDEX_V(p_ease, EaseType::EASE_MAX, Variant());
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// Special case for bool.
if (p_initial_val.get_type() == Variant::BOOL) {
return run_equation(p_trans, p_ease, p_time, p_initial_val, p_delta_val, p_duration) >= 0.5;
}
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Variant ret = Animation::add_variant(p_initial_val, p_delta_val);
ret = Animation::interpolate_variant(p_initial_val, ret, run_equation(p_trans, p_ease, p_time, 0.0, 1.0, p_duration));
return ret;
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}
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String Tween::to_string() {
String ret = Object::to_string();
Node *node = get_bound_node();
if (node) {
ret += vformat(" (bound to %s)", node->get_name());
}
return ret;
}
void Tween::_bind_methods() {
ClassDB::bind_method(D_METHOD("tween_property", "object", "property", "final_val", "duration"), &Tween::tween_property);
ClassDB::bind_method(D_METHOD("tween_interval", "time"), &Tween::tween_interval);
ClassDB::bind_method(D_METHOD("tween_callback", "callback"), &Tween::tween_callback);
ClassDB::bind_method(D_METHOD("tween_method", "method", "from", "to", "duration"), &Tween::tween_method);
ClassDB::bind_method(D_METHOD("custom_step", "delta"), &Tween::custom_step);
ClassDB::bind_method(D_METHOD("stop"), &Tween::stop);
ClassDB::bind_method(D_METHOD("pause"), &Tween::pause);
ClassDB::bind_method(D_METHOD("play"), &Tween::play);
ClassDB::bind_method(D_METHOD("kill"), &Tween::kill);
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ClassDB::bind_method(D_METHOD("get_total_elapsed_time"), &Tween::get_total_time);
ClassDB::bind_method(D_METHOD("is_running"), &Tween::is_running);
ClassDB::bind_method(D_METHOD("is_valid"), &Tween::is_valid);
ClassDB::bind_method(D_METHOD("bind_node", "node"), &Tween::bind_node);
ClassDB::bind_method(D_METHOD("set_process_mode", "mode"), &Tween::set_process_mode);
ClassDB::bind_method(D_METHOD("set_pause_mode", "mode"), &Tween::set_pause_mode);
ClassDB::bind_method(D_METHOD("set_parallel", "parallel"), &Tween::set_parallel, DEFVAL(true));
ClassDB::bind_method(D_METHOD("set_loops", "loops"), &Tween::set_loops, DEFVAL(0));
ClassDB::bind_method(D_METHOD("get_loops_left"), &Tween::get_loops_left);
ClassDB::bind_method(D_METHOD("set_speed_scale", "speed"), &Tween::set_speed_scale);
ClassDB::bind_method(D_METHOD("set_trans", "trans"), &Tween::set_trans);
ClassDB::bind_method(D_METHOD("set_ease", "ease"), &Tween::set_ease);
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ClassDB::bind_method(D_METHOD("parallel"), &Tween::parallel);
ClassDB::bind_method(D_METHOD("chain"), &Tween::chain);
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ClassDB::bind_static_method("Tween", D_METHOD("interpolate_value", "initial_value", "delta_value", "elapsed_time", "duration", "trans_type", "ease_type"), &Tween::interpolate_variant);
ADD_SIGNAL(MethodInfo("step_finished", PropertyInfo(Variant::INT, "idx")));
ADD_SIGNAL(MethodInfo("loop_finished", PropertyInfo(Variant::INT, "loop_count")));
ADD_SIGNAL(MethodInfo("finished"));
BIND_ENUM_CONSTANT(TWEEN_PROCESS_PHYSICS);
BIND_ENUM_CONSTANT(TWEEN_PROCESS_IDLE);
BIND_ENUM_CONSTANT(TWEEN_PAUSE_BOUND);
BIND_ENUM_CONSTANT(TWEEN_PAUSE_STOP);
BIND_ENUM_CONSTANT(TWEEN_PAUSE_PROCESS);
BIND_ENUM_CONSTANT(TRANS_LINEAR);
BIND_ENUM_CONSTANT(TRANS_SINE);
BIND_ENUM_CONSTANT(TRANS_QUINT);
BIND_ENUM_CONSTANT(TRANS_QUART);
BIND_ENUM_CONSTANT(TRANS_QUAD);
BIND_ENUM_CONSTANT(TRANS_EXPO);
BIND_ENUM_CONSTANT(TRANS_ELASTIC);
BIND_ENUM_CONSTANT(TRANS_CUBIC);
BIND_ENUM_CONSTANT(TRANS_CIRC);
BIND_ENUM_CONSTANT(TRANS_BOUNCE);
BIND_ENUM_CONSTANT(TRANS_BACK);
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BIND_ENUM_CONSTANT(TRANS_SPRING);
BIND_ENUM_CONSTANT(EASE_IN);
BIND_ENUM_CONSTANT(EASE_OUT);
BIND_ENUM_CONSTANT(EASE_IN_OUT);
BIND_ENUM_CONSTANT(EASE_OUT_IN);
}
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Tween::Tween() {
ERR_FAIL_MSG("Tween can't be created directly. Use create_tween() method.");
}
Tween::Tween(bool p_valid) {
valid = p_valid;
}
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Ref<PropertyTweener> PropertyTweener::from(const Variant &p_value) {
ERR_FAIL_COND_V(tween.is_null(), nullptr);
if (!tween->_validate_type_match(p_value, final_val)) {
return nullptr;
}
initial_val = p_value;
do_continue = false;
return this;
}
Ref<PropertyTweener> PropertyTweener::from_current() {
do_continue = false;
return this;
}
Ref<PropertyTweener> PropertyTweener::as_relative() {
relative = true;
return this;
}
Ref<PropertyTweener> PropertyTweener::set_trans(Tween::TransitionType p_trans) {
trans_type = p_trans;
return this;
}
Ref<PropertyTweener> PropertyTweener::set_ease(Tween::EaseType p_ease) {
ease_type = p_ease;
return this;
}
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Ref<PropertyTweener> PropertyTweener::set_delay(double p_delay) {
delay = p_delay;
return this;
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}
void PropertyTweener::start() {
elapsed_time = 0;
finished = false;
Object *target_instance = ObjectDB::get_instance(target);
if (!target_instance) {
WARN_PRINT("Target object freed before starting, aborting Tweener.");
return;
}
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if (do_continue) {
initial_val = target_instance->get_indexed(property);
}
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if (relative) {
final_val = Animation::add_variant(initial_val, base_final_val);
}
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delta_val = Animation::subtract_variant(final_val, initial_val);
}
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bool PropertyTweener::step(double &r_delta) {
if (finished) {
// This is needed in case there's a parallel Tweener with longer duration.
return false;
}
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Object *target_instance = ObjectDB::get_instance(target);
if (!target_instance) {
return false;
}
elapsed_time += r_delta;
if (elapsed_time < delay) {
r_delta = 0;
return true;
}
double time = MIN(elapsed_time - delay, duration);
if (time < duration) {
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target_instance->set_indexed(property, tween->interpolate_variant(initial_val, delta_val, time, duration, trans_type, ease_type));
r_delta = 0;
return true;
} else {
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target_instance->set_indexed(property, final_val);
finished = true;
r_delta = elapsed_time - delay - duration;
emit_signal(SNAME("finished"));
return false;
}
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}
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void PropertyTweener::set_tween(const Ref<Tween> &p_tween) {
tween = p_tween;
if (trans_type == Tween::TRANS_MAX) {
trans_type = tween->get_trans();
}
if (ease_type == Tween::EASE_MAX) {
ease_type = tween->get_ease();
}
}
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void PropertyTweener::_bind_methods() {
ClassDB::bind_method(D_METHOD("from", "value"), &PropertyTweener::from);
ClassDB::bind_method(D_METHOD("from_current"), &PropertyTweener::from_current);
ClassDB::bind_method(D_METHOD("as_relative"), &PropertyTweener::as_relative);
ClassDB::bind_method(D_METHOD("set_trans", "trans"), &PropertyTweener::set_trans);
ClassDB::bind_method(D_METHOD("set_ease", "ease"), &PropertyTweener::set_ease);
ClassDB::bind_method(D_METHOD("set_delay", "delay"), &PropertyTweener::set_delay);
}
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PropertyTweener::PropertyTweener(const Object *p_target, const Vector<StringName> &p_property, const Variant &p_to, double p_duration) {
target = p_target->get_instance_id();
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property = p_property;
initial_val = p_target->get_indexed(property);
base_final_val = p_to;
final_val = base_final_val;
duration = p_duration;
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if (p_target->is_ref_counted()) {
ref_copy = p_target;
}
}
PropertyTweener::PropertyTweener() {
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ERR_FAIL_MSG("PropertyTweener can't be created directly. Use the tween_property() method in Tween.");
}
void IntervalTweener::start() {
elapsed_time = 0;
finished = false;
}
bool IntervalTweener::step(double &r_delta) {
if (finished) {
return false;
}
elapsed_time += r_delta;
if (elapsed_time < duration) {
r_delta = 0;
return true;
} else {
finished = true;
r_delta = elapsed_time - duration;
emit_signal(SNAME("finished"));
return false;
}
}
IntervalTweener::IntervalTweener(double p_time) {
duration = p_time;
}
IntervalTweener::IntervalTweener() {
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ERR_FAIL_MSG("IntervalTweener can't be created directly. Use the tween_interval() method in Tween.");
}
Ref<CallbackTweener> CallbackTweener::set_delay(double p_delay) {
delay = p_delay;
return this;
}
void CallbackTweener::start() {
elapsed_time = 0;
finished = false;
}
bool CallbackTweener::step(double &r_delta) {
if (finished) {
return false;
}
elapsed_time += r_delta;
if (elapsed_time >= delay) {
Variant result;
Callable::CallError ce;
callback.callp(nullptr, 0, result, ce);
if (ce.error != Callable::CallError::CALL_OK) {
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ERR_FAIL_V_MSG(false, "Error calling method from CallbackTweener: " + Variant::get_callable_error_text(callback, nullptr, 0, ce));
}
finished = true;
r_delta = elapsed_time - delay;
emit_signal(SNAME("finished"));
return false;
}
r_delta = 0;
return true;
}
void CallbackTweener::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_delay", "delay"), &CallbackTweener::set_delay);
}
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CallbackTweener::CallbackTweener(const Callable &p_callback) {
callback = p_callback;
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Object *callback_instance = p_callback.get_object();
if (callback_instance && callback_instance->is_ref_counted()) {
ref_copy = callback_instance;
}
}
CallbackTweener::CallbackTweener() {
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ERR_FAIL_MSG("CallbackTweener can't be created directly. Use the tween_callback() method in Tween.");
}
Ref<MethodTweener> MethodTweener::set_delay(double p_delay) {
delay = p_delay;
return this;
}
Ref<MethodTweener> MethodTweener::set_trans(Tween::TransitionType p_trans) {
trans_type = p_trans;
return this;
}
Ref<MethodTweener> MethodTweener::set_ease(Tween::EaseType p_ease) {
ease_type = p_ease;
return this;
}
void MethodTweener::start() {
elapsed_time = 0;
finished = false;
}
bool MethodTweener::step(double &r_delta) {
if (finished) {
return false;
}
elapsed_time += r_delta;
if (elapsed_time < delay) {
r_delta = 0;
return true;
}
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Variant current_val;
double time = MIN(elapsed_time - delay, duration);
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if (time < duration) {
current_val = tween->interpolate_variant(initial_val, delta_val, time, duration, trans_type, ease_type);
} else {
current_val = final_val;
}
const Variant **argptr = (const Variant **)alloca(sizeof(Variant *));
argptr[0] = &current_val;
Variant result;
Callable::CallError ce;
callback.callp(argptr, 1, result, ce);
if (ce.error != Callable::CallError::CALL_OK) {
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ERR_FAIL_V_MSG(false, "Error calling method from MethodTweener: " + Variant::get_callable_error_text(callback, argptr, 1, ce));
}
if (time < duration) {
r_delta = 0;
return true;
} else {
finished = true;
r_delta = elapsed_time - delay - duration;
emit_signal(SNAME("finished"));
return false;
}
}
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void MethodTweener::set_tween(const Ref<Tween> &p_tween) {
tween = p_tween;
if (trans_type == Tween::TRANS_MAX) {
trans_type = tween->get_trans();
}
if (ease_type == Tween::EASE_MAX) {
ease_type = tween->get_ease();
}
}
void MethodTweener::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_delay", "delay"), &MethodTweener::set_delay);
ClassDB::bind_method(D_METHOD("set_trans", "trans"), &MethodTweener::set_trans);
ClassDB::bind_method(D_METHOD("set_ease", "ease"), &MethodTweener::set_ease);
}
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MethodTweener::MethodTweener(const Callable &p_callback, const Variant &p_from, const Variant &p_to, double p_duration) {
callback = p_callback;
initial_val = p_from;
delta_val = Animation::subtract_variant(p_to, p_from);
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final_val = p_to;
duration = p_duration;
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Object *callback_instance = p_callback.get_object();
if (callback_instance && callback_instance->is_ref_counted()) {
ref_copy = callback_instance;
}
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}
MethodTweener::MethodTweener() {
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ERR_FAIL_MSG("MethodTweener can't be created directly. Use the tween_method() method in Tween.");
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}