Add tween support for godot

scene/animation/tween.cpp

@@ -0,0 +1,684 @@
+/*************************************************************************/
+/*  tween.cpp                                                            */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* 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.                */
+/*************************************************************************/
+#include "tween.h"
+
+bool Tween::_set(const StringName& p_name, const Variant& p_value) {
+
+	String name=p_name;
+
+	if (name=="playback/speed" || name=="speed") { //bw compatibility
+		set_speed(p_value);
+
+	} else if (name=="playback/active") {
+		set_active(p_value);
+	}
+	return true;
+}
+
+bool Tween::_get(const StringName& p_name,Variant &r_ret) const {
+
+	String name=p_name;
+
+	if (name=="playback/speed") { //bw compatibility
+	
+		r_ret=speed_scale;
+	} else if (name=="playback/active") {
+
+		r_ret=is_active();
+	}
+	return true;
+}
+
+void Tween::_get_property_list(List<PropertyInfo> *p_list) const {
+
+	p_list->push_back( PropertyInfo( Variant::BOOL, "playback/active", PROPERTY_HINT_NONE,"" ) );
+	p_list->push_back( PropertyInfo( Variant::REAL, "playback/speed", PROPERTY_HINT_RANGE, "-64,64,0.01") );
+}
+
+void Tween::_notification(int p_what) {
+
+	switch(p_what) {
+	
+		case NOTIFICATION_ENTER_SCENE: {
+
+			if (!processing) {
+				//make sure that a previous process state was not saved
+				//only process if "processing" is set
+				set_fixed_process(false);
+				set_process(false);
+			}
+		} break;
+		case NOTIFICATION_READY: {
+
+		} break;
+		case NOTIFICATION_PROCESS: {
+			if (tween_process_mode==TWEEN_PROCESS_FIXED)
+				break;
+
+			if (processing)
+				_tween_process( get_process_delta_time() );
+		} break;
+		case NOTIFICATION_FIXED_PROCESS: {
+		
+			if (tween_process_mode==TWEEN_PROCESS_IDLE)
+				break;
+
+			if (processing)
+				_tween_process( get_fixed_process_delta_time() );
+		} break;
+		case NOTIFICATION_EXIT_SCENE: {
+		
+			stop_all();
+		} break;
+	}
+}
+
+void Tween::_bind_methods() {
+
+	ObjectTypeDB::bind_method(_MD("is_active"),&Tween::is_active );
+	ObjectTypeDB::bind_method(_MD("set_active","active"),&Tween::set_active );
+
+	ObjectTypeDB::bind_method(_MD("set_speed","speed"),&Tween::set_speed);
+	ObjectTypeDB::bind_method(_MD("get_speed"),&Tween::get_speed);
+
+	ObjectTypeDB::bind_method(_MD("set_tween_process_mode","mode"),&Tween::set_tween_process_mode);
+	ObjectTypeDB::bind_method(_MD("get_tween_process_mode"),&Tween::get_tween_process_mode);
+
+	ObjectTypeDB::bind_method(_MD("start"),&Tween::start );
+	ObjectTypeDB::bind_method(_MD("reset","object,key"),&Tween::reset );
+	ObjectTypeDB::bind_method(_MD("reset_all"),&Tween::reset_all );
+	ObjectTypeDB::bind_method(_MD("stop","object,key"),&Tween::stop );
+	ObjectTypeDB::bind_method(_MD("stop_all"),&Tween::stop_all );
+
+	ObjectTypeDB::bind_method(_MD("interpolate_property","object","property","initial_val","final_val","times_in_sec","trans_type","ease_type"),&Tween::interpolate_property );
+	ObjectTypeDB::bind_method(_MD("interpolate_method","object","method","initial_val","final_val","times_in_sec","trans_type","ease_type"),&Tween::interpolate_method );
+
+	ADD_SIGNAL( MethodInfo("tween_start", PropertyInfo( Variant::OBJECT,"object"), PropertyInfo( Variant::STRING,"key")) );
+	ADD_SIGNAL( MethodInfo("tween_step", PropertyInfo( Variant::OBJECT,"object"), PropertyInfo( Variant::STRING,"key"), PropertyInfo( Variant::OBJECT,"value")) );
+	ADD_SIGNAL( MethodInfo("tween_complete", PropertyInfo( Variant::INT,"id")) );
+
+	//ADD_PROPERTY( PropertyInfo( Variant::BOOL, "activate"), _SCS("set_active"), _SCS("is_active"));
+
+	BIND_CONSTANT(TRANS_LINEAR);
+	BIND_CONSTANT(TRANS_SINE);
+	BIND_CONSTANT(TRANS_QUINT);
+	BIND_CONSTANT(TRANS_QUART);
+	BIND_CONSTANT(TRANS_QUAD);
+	BIND_CONSTANT(TRANS_EXPO);
+	BIND_CONSTANT(TRANS_ELASTIC);
+	BIND_CONSTANT(TRANS_CUBIC);
+	BIND_CONSTANT(TRANS_CIRC);
+	BIND_CONSTANT(TRANS_BOUNCE);
+	BIND_CONSTANT(TRANS_BACK);
+
+	BIND_CONSTANT(EASE_IN);
+	BIND_CONSTANT(EASE_OUT);
+	BIND_CONSTANT(EASE_IN_OUT);
+	BIND_CONSTANT(EASE_OUT_IN);
+}
+
+Variant Tween::_run_equation(InterpolateData& p_data) {
+
+	Variant& initial_val = p_data.initial_val;
+	Variant& delta_val = p_data.delta_val;
+	Variant result;
+
+#define APPLY_EQUATION(element)\
+	r.element = _run_equation(p_data.trans_type, p_data.ease_type, p_data.elapsed, i.element, d.element, p_data.times_in_sec);
+
+	switch(initial_val.get_type())
+	{
+	case Variant::INT:
+		result = (int) _run_equation(p_data.trans_type, p_data.ease_type, p_data.elapsed, (int) initial_val, (int) delta_val, p_data.times_in_sec);
+		break;
+
+	case Variant::REAL:
+		result = _run_equation(p_data.trans_type, p_data.ease_type, p_data.elapsed, (real_t) initial_val, (real_t) delta_val, p_data.times_in_sec);
+		break;
+
+	case Variant::VECTOR2:
+		{
+			Vector2 i = initial_val;
+			Vector2 d = delta_val;
+			Vector2 r;
+
+			APPLY_EQUATION(x);
+			APPLY_EQUATION(y);
+
+			result = r;
+		}
+		break;
+
+	case Variant::VECTOR3:
+		{
+			Vector3 i = initial_val;
+			Vector3 d = delta_val;
+			Vector3 r;
+
+			APPLY_EQUATION(x);
+			APPLY_EQUATION(y);
+			APPLY_EQUATION(z);
+
+			result = r;
+		}
+		break;
+
+	case Variant::MATRIX3:
+		{
+			Matrix3 i = initial_val;
+			Matrix3 d = delta_val;
+			Matrix3 r;
+
+			APPLY_EQUATION(elements[0][0]);
+			APPLY_EQUATION(elements[0][1]);
+			APPLY_EQUATION(elements[0][2]);
+			APPLY_EQUATION(elements[1][0]);
+			APPLY_EQUATION(elements[1][1]);
+			APPLY_EQUATION(elements[1][2]);
+			APPLY_EQUATION(elements[2][0]);
+			APPLY_EQUATION(elements[2][1]);
+			APPLY_EQUATION(elements[2][2]);
+
+			result = r;
+		}
+	break;
+
+	case Variant::MATRIX32:
+		{
+			Matrix3 i = initial_val;
+			Matrix3 d = delta_val;
+			Matrix3 r;
+
+			APPLY_EQUATION(elements[0][0]);
+			APPLY_EQUATION(elements[0][1]);
+			APPLY_EQUATION(elements[1][0]);
+			APPLY_EQUATION(elements[1][1]);
+			APPLY_EQUATION(elements[2][0]);
+			APPLY_EQUATION(elements[2][1]);
+
+			result = r;
+		}
+	break;
+	case Variant::QUAT:
+		{
+			Quat i = initial_val;
+			Quat d = delta_val;
+			Quat r;
+
+			APPLY_EQUATION(x);
+			APPLY_EQUATION(y);
+			APPLY_EQUATION(z);
+			APPLY_EQUATION(w);
+
+			result = r;
+		}
+		break;
+	case Variant::_AABB:
+		{
+			AABB i = initial_val;
+			AABB d = delta_val;
+			AABB r;
+
+			APPLY_EQUATION(pos.x);
+			APPLY_EQUATION(pos.y);
+			APPLY_EQUATION(pos.z);
+			APPLY_EQUATION(size.x);
+			APPLY_EQUATION(size.y);
+			APPLY_EQUATION(size.z);
+
+			result = r;
+		}
+		break;
+	case Variant::TRANSFORM:
+		{
+			Transform i = initial_val;
+			Transform d = delta_val;
+			Transform r;
+
+			APPLY_EQUATION(basis.elements[0][0]);
+			APPLY_EQUATION(basis.elements[0][1]);
+			APPLY_EQUATION(basis.elements[0][2]);
+			APPLY_EQUATION(basis.elements[1][0]);
+			APPLY_EQUATION(basis.elements[1][1]);
+			APPLY_EQUATION(basis.elements[1][2]);
+			APPLY_EQUATION(basis.elements[2][0]);
+			APPLY_EQUATION(basis.elements[2][1]);
+			APPLY_EQUATION(basis.elements[2][2]);
+			APPLY_EQUATION(origin.x);
+			APPLY_EQUATION(origin.y);
+			APPLY_EQUATION(origin.z);
+
+			result = r;
+		}
+		break;
+	case Variant::COLOR:
+		{
+			Color i = initial_val;
+			Color d = delta_val;
+			Color r;
+
+			APPLY_EQUATION(r);
+			APPLY_EQUATION(g);
+			APPLY_EQUATION(b);
+			APPLY_EQUATION(a);
+
+			result = r;
+		}
+		break;
+	};
+#undef APPLY_EQUATION
+
+	return result;
+}
+
+bool Tween::_apply_tween_value(InterpolateData& p_data, Variant& value) {
+
+	Variant& object = p_data.object;
+
+	if(p_data.is_method) {
+
+		Variant *arg[1] = { &value };
+
+		Variant::CallError error;
+		object.call(p_data.key, (const Variant **) arg, 1, error);
+		if(error.error == Variant::CallError::CALL_OK)
+			return true;
+
+		return false;
+
+	} else {
+
+		bool valid = false;
+		object.set(p_data.key,value, &valid);
+		return valid;
+	}
+	return true;
+}
+
+void Tween::_tween_process(float p_delta) {
+
+	if (speed_scale == 0)
+		return;
+	p_delta *= speed_scale;
+
+	for(List<InterpolateData>::Element *E=interpolates.front();E;E=E->next()) {
+
+		InterpolateData& data = E->get();
+		if(!data.active || data.elapsed == data.times_in_sec)
+			continue;
+
+		if(data.elapsed == 0)
+			emit_signal("tween_start",data.object,data.key);
+
+		data.elapsed += p_delta;
+		if(data.elapsed > data.times_in_sec)
+			data.elapsed = data.times_in_sec;
+
+		Variant result = _run_equation(data);
+		emit_signal("tween_step",data.object,data.key,result);
+
+		_apply_tween_value(data, result);
+
+		if(data.elapsed == data.times_in_sec)
+			emit_signal("tween_complete",data.object,data.key);
+	}
+}
+
+void Tween::set_tween_process_mode(TweenProcessMode p_mode) {
+
+	if (tween_process_mode==p_mode)
+		return;
+
+	bool pr = processing;
+	if (pr)
+		_set_process(false);
+	tween_process_mode=p_mode;
+	if (pr)
+		_set_process(true);
+}
+
+Tween::TweenProcessMode Tween::get_tween_process_mode() const {
+
+	return tween_process_mode;
+}
+
+void Tween::_set_process(bool p_process,bool p_force) {
+
+	if (processing==p_process && !p_force)
+		return;
+
+	switch(tween_process_mode) {
+
+		case TWEEN_PROCESS_FIXED: set_fixed_process(p_process && active); break;
+		case TWEEN_PROCESS_IDLE: set_process(p_process && active); break;
+	}
+
+	processing=p_process;
+}
+
+bool Tween::is_active() const {
+
+	return active;
+}
+
+void Tween::set_active(bool p_active) {
+
+	if (active==p_active)
+		return;
+
+	active=p_active;
+	_set_process(processing,true);
+}
+
+void Tween::set_speed(float p_speed) {
+
+	speed_scale=p_speed;
+}
+
+float Tween::get_speed() const {
+
+	return speed_scale;
+}
+
+bool Tween::start() {
+
+	set_active(true);
+	_set_process(true);
+	return true;
+}
+
+bool Tween::reset(Variant p_object, String p_key) {
+
+	for(List<InterpolateData>::Element *E=interpolates.front();E;E=E->next()) {
+
+		InterpolateData& data = E->get();
+		if(data.object == p_object && data.key == p_key)
+			_apply_tween_value(data, data.initial_val);
+	}
+	return true;
+}
+
+bool Tween::reset_all() {
+
+	for(List<InterpolateData>::Element *E=interpolates.front();E;E=E->next()) {
+
+		InterpolateData& data = E->get();
+		_apply_tween_value(data, data.initial_val);
+	}
+	return true;
+}
+
+bool Tween::stop(Variant p_object, String p_key) {
+
+	for(List<InterpolateData>::Element *E=interpolates.front();E;E=E->next()) {
+
+		InterpolateData& data = E->get();
+		if(data.object == p_object && data.key == p_key)
+			data.active = false;
+	}
+	return true;
+}
+
+bool Tween::stop_all() {
+
+	set_active(false);
+	_set_process(false);
+
+	for(List<InterpolateData>::Element *E=interpolates.front();E;E=E->next()) {
+
+		InterpolateData& data = E->get();
+		data.active = false;
+	}
+	return true;
+}
+
+bool Tween::resume(Variant p_object, String p_key) {
+
+	set_active(true);
+	_set_process(true);
+
+	for(List<InterpolateData>::Element *E=interpolates.front();E;E=E->next()) {
+
+		InterpolateData& data = E->get();
+		if(data.object == p_object && data.key == p_key)
+			data.active = true;
+	}
+	return true;
+}
+
+bool Tween::resume_all() {
+
+	set_active(true);
+	_set_process(true);
+
+	for(List<InterpolateData>::Element *E=interpolates.front();E;E=E->next()) {
+
+		InterpolateData& data = E->get();
+		data.active = true;
+	}
+	return true;
+}
+
+bool Tween::_calc_delta_val(InterpolateData& p_data) {
+
+	Variant& initial_val = p_data.initial_val;
+	Variant& delta_val = p_data.delta_val;
+	Variant& final_val = p_data.final_val;
+
+	switch(initial_val.get_type()) {
+		case Variant::INT:
+			delta_val = (int) final_val - (int) initial_val;
+			break;
+
+		case Variant::REAL:
+			delta_val = (real_t) final_val - (real_t) initial_val;
+			break;
+
+		case Variant::VECTOR2:
+			delta_val = final_val.operator Vector2() - initial_val.operator Vector2();
+			break;
+
+		case Variant::VECTOR3:
+			delta_val = final_val.operator Vector3() - initial_val.operator Vector3();
+			break;
+
+		case Variant::MATRIX3:
+			{
+				Matrix3 i = initial_val;
+				Matrix3 f = final_val;
+				delta_val = Matrix3(f.elements[0][0] - i.elements[0][0],
+					f.elements[0][1] - i.elements[0][1],
+					f.elements[0][2] - i.elements[0][2],
+					f.elements[1][0] - i.elements[1][0],
+					f.elements[1][1] - i.elements[1][1],
+					f.elements[1][2] - i.elements[1][2],
+					f.elements[2][0] - i.elements[2][0],
+					f.elements[2][1] - i.elements[2][1],
+					f.elements[2][2] - i.elements[2][2]
+				);
+			}
+			break;
+
+		case Variant::MATRIX32:
+			{
+				Matrix32 i = initial_val;
+				Matrix32 f = final_val;
+				Matrix32 d = Matrix32();
+				d[0][0] = f.elements[0][0] - i.elements[0][0];
+				d[0][1] = f.elements[0][1] - i.elements[0][1];
+				d[1][0] = f.elements[1][0] - i.elements[1][0];
+				d[1][1] = f.elements[1][1] - i.elements[1][1];
+				d[2][0] = f.elements[2][0] - i.elements[2][0];
+				d[2][1] = f.elements[2][1] - i.elements[2][1];
+				delta_val = d;
+			}
+			break;
+		case Variant::QUAT:
+			delta_val = final_val.operator Quat() - initial_val.operator Quat();
+			break;
+		case Variant::_AABB:
+			{
+				AABB i = initial_val;
+				AABB f = final_val;
+				delta_val = AABB(f.pos - i.pos, f.size - i.size);
+			}
+			break;
+		case Variant::TRANSFORM:
+			{
+				Transform i = initial_val;
+				Transform f = final_val;
+				Transform d;
+				d.set(f.basis.elements[0][0] - i.basis.elements[0][0],
+					f.basis.elements[0][1] - i.basis.elements[0][1],
+					f.basis.elements[0][2] - i.basis.elements[0][2],
+					f.basis.elements[1][0] - i.basis.elements[1][0],
+					f.basis.elements[1][1] - i.basis.elements[1][1],
+					f.basis.elements[1][2] - i.basis.elements[1][2],
+					f.basis.elements[2][0] - i.basis.elements[2][0],
+					f.basis.elements[2][1] - i.basis.elements[2][1],
+					f.basis.elements[2][2] - i.basis.elements[2][2],
+					f.origin.x - i.origin.x,
+					f.origin.y - i.origin.y,
+					f.origin.z - i.origin.z
+				);
+
+				delta_val = d;
+			}
+			break;
+		case Variant::COLOR:
+			{
+				Color i = initial_val;
+				Color f = final_val;
+				delta_val = Color(f.r - i.r, f.g - i.g, f.b - i.b, f.a - i.a);
+			}
+			break;
+
+		default:
+			ERR_PRINT("Invalid param type, except(int/real/vector2/vector/matrix/matrix32/quat/aabb/transform/color)");
+			return false;
+	};
+	return true;
+}
+
+bool Tween::interpolate_property(Variant p_object
+	, String p_property
+	, Variant p_initial_val
+	, Variant p_final_val
+	, real_t p_times_in_sec
+	, TransitionType p_trans_type
+	, EaseType p_ease_type
+) {
+
+	ERR_FAIL_COND_V(p_object.get_type() != Variant::OBJECT, false);
+	ERR_FAIL_COND_V(p_initial_val.get_type() != p_final_val.get_type(), false);
+	ERR_FAIL_COND_V(p_times_in_sec <= 0, false);
+
+	bool prop_found = false;
+	Object *obj = (Object *) p_object;
+	List<PropertyInfo> props;
+	obj->get_property_list(&props);
+	for(List<PropertyInfo>::Element *E=props.front();E;E=E->next()) {
+
+		PropertyInfo& prop=E->get();
+		if(prop.name==p_property)
+		{
+			prop_found = true;
+			break;
+		}
+	}
+	ERR_FAIL_COND_V(!prop_found, false);
+
+	InterpolateData data;
+	data.active = true;
+	data.is_method = false;
+	data.elapsed = 0;
+
+	data.object = p_object;
+	data.key = p_property;
+	data.initial_val = p_initial_val;
+	data.final_val = p_final_val;
+	data.times_in_sec = p_times_in_sec;
+	data.trans_type = p_trans_type;
+	data.ease_type = p_ease_type;
+
+	if(!_calc_delta_val(data))
+		return false;
+
+	interpolates.push_back(data);
+	return true;
+}
+
+bool Tween::interpolate_method(Variant p_object
+	, String p_method
+	, Variant p_initial_val
+	, Variant p_final_val
+	, real_t p_times_in_sec
+	, TransitionType p_trans_type
+	, EaseType p_ease_type
+) {
+
+	ERR_FAIL_COND_V(p_object.get_type() != Variant::OBJECT, false);
+	ERR_FAIL_COND_V(p_initial_val.get_type() != p_final_val.get_type(), false);
+	ERR_FAIL_COND_V(p_times_in_sec <= 0, false);
+
+	Object *obj = (Object *) p_object;
+	ERR_FAIL_COND_V(!obj->has_method(p_method), false);
+
+	InterpolateData data;
+	data.active = true;
+	data.is_method = true;
+	data.elapsed = 0;
+
+	data.object = p_object;
+	data.key = p_method;
+	data.initial_val = p_initial_val;
+	data.final_val = p_final_val;
+	data.times_in_sec = p_times_in_sec;
+	data.trans_type = p_trans_type;
+	data.ease_type = p_ease_type;
+
+	if(!_calc_delta_val(data))
+		return false;
+
+	interpolates.push_back(data);
+	return true;
+}
+
+Tween::Tween() {
+
+	//String autoplay;
+	tween_process_mode=TWEEN_PROCESS_IDLE;
+	processing=false;
+	active=false;
+	speed_scale=1;
+}
+
+Tween::~Tween() {
+
+}

scene/animation/tween.h

@@ -0,0 +1,161 @@
+/*************************************************************************/
+/*  tween.h                                                              */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* 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.                */
+/*************************************************************************/
+#ifndef TWEEN_H
+#define TWEEN_H
+
+#include "scene/main/node.h"
+
+
+class Tween : public Node {
+
+	OBJ_TYPE( Tween, Node );
+
+public:
+	enum TweenProcessMode {
+		TWEEN_PROCESS_FIXED,
+		TWEEN_PROCESS_IDLE,
+	};
+
+    enum TransitionType {
+        TRANS_LINEAR,
+        TRANS_SINE,
+        TRANS_QUINT,
+        TRANS_QUART,
+        TRANS_QUAD,
+        TRANS_EXPO,
+        TRANS_ELASTIC,
+        TRANS_CUBIC,
+        TRANS_CIRC,
+        TRANS_BOUNCE,
+        TRANS_BACK,
+
+		TRANS_COUNT,
+    };
+        
+    enum EaseType {
+        EASE_IN,
+        EASE_OUT,
+        EASE_IN_OUT,
+		EASE_OUT_IN,
+
+		EASE_COUNT,
+    };
+
+private:
+
+	struct InterpolateData {
+		bool active;
+		bool is_method;
+		real_t elapsed;
+
+		Variant object;
+		String key;
+		Variant initial_val;
+		Variant delta_val;
+		Variant final_val;
+		real_t times_in_sec;
+		TransitionType trans_type;
+		EaseType ease_type;
+	};
+
+	String autoplay;
+	TweenProcessMode tween_process_mode;
+	bool processing;
+	bool active;
+	float speed_scale;
+
+	List<InterpolateData> interpolates;
+
+	typedef real_t (*interpolater)(real_t t, real_t b, real_t c, real_t d);
+	static interpolater interpolaters[TRANS_COUNT][EASE_COUNT];
+
+	real_t _run_equation(TransitionType p_trans_type, EaseType p_ease_type, real_t t, real_t b, real_t c, real_t d);
+	Variant _run_equation(InterpolateData& p_data);
+	bool _calc_delta_val(InterpolateData& p_data);
+	bool _apply_tween_value(InterpolateData& p_data, Variant& value);
+
+	void _tween_process(float p_delta);
+	void _set_process(bool p_process,bool p_force=false);
+
+protected:
+
+	bool _set(const StringName& p_name, const Variant& p_value);
+	bool _get(const StringName& p_name,Variant &r_ret) const;
+	void _get_property_list(List<PropertyInfo> *p_list) const;
+	void _notification(int p_what);
+
+	static void _bind_methods();
+
+public:
+
+	bool is_active() const;
+	void set_active(bool p_active);
+
+	void set_tween_process_mode(TweenProcessMode p_mode);
+	TweenProcessMode get_tween_process_mode() const;
+
+	void set_speed(float p_speed);
+	float get_speed() const;
+
+	bool start();
+	bool reset(Variant p_object, String p_key);
+	bool reset_all();
+	bool stop(Variant p_object, String p_key);
+	bool stop_all();
+	bool resume(Variant p_object, String p_key);
+	bool resume_all();
+
+	bool interpolate_property(Variant p_object
+		, String p_property
+		, Variant p_initial_val
+		, Variant p_final_val
+		, real_t p_times_in_sec
+		, TransitionType p_trans_type
+		, EaseType p_ease_type
+	);
+
+	bool interpolate_method(Variant p_object
+		, String p_method
+		, Variant p_initial_val
+		, Variant p_final_val
+		, real_t p_times_in_sec
+		, TransitionType p_trans_type
+		, EaseType p_ease_type
+	);
+
+	Tween();
+	~Tween();
+};
+
+VARIANT_ENUM_CAST( Tween::TweenProcessMode );
+VARIANT_ENUM_CAST( Tween::TransitionType );
+VARIANT_ENUM_CAST( Tween::EaseType );
+
+#endif
+

scene/animation/tween_interpolaters.cpp

@@ -0,0 +1,407 @@
+/*************************************************************************/
+/*  tween.cpp                                                            */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* 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.                */
+/*************************************************************************/
+#include "tween.h"
+
+const real_t pi = 3.1415926535898;
+
+///////////////////////////////////////////////////////////////////////////
+// linear
+///////////////////////////////////////////////////////////////////////////
+namespace linear {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * t / d + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * t / d + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * t / d + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * t / d + b;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// sine
+///////////////////////////////////////////////////////////////////////////
+namespace sine {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return -c * cos(t / d * (pi / 2)) + c + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * sin(t / d * (pi / 2)) + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return -c / 2 * (cos(pi * t / d) - 1) + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// quint
+///////////////////////////////////////////////////////////////////////////
+namespace quint {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * pow(t / d, 5) + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * (pow(t / d - 1, 5) + 1) + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		t = t / d * 2;
+		if (t < 1) return c / 2 * pow(t, 5) + b;
+		return c / 2 * (pow(t - 2, 5) + 2) + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// quart
+///////////////////////////////////////////////////////////////////////////
+namespace quart {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * pow(t / d, 4) + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return -c * (pow(t / d - 1, 4) - 1) + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		t = t / d * 2;
+		if (t < 1) return c / 2 * pow(t, 4) + b;
+		return -c / 2 * (pow(t - 2, 4) - 2) + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// quad
+///////////////////////////////////////////////////////////////////////////
+namespace quad {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * pow(t / d, 2) + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		t = t / d;
+		return -c * t * (t - 2) + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		t = t / d * 2;
+		if (t < 1) return c / 2 * pow(t, 2) + b;
+		return -c / 2 * ((t - 1) * (t - 3) - 1) + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// expo
+///////////////////////////////////////////////////////////////////////////
+namespace expo {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		if (t == 0) return b;
+		return c * pow(2, 10 * (t / d - 1)) + b - c * 0.001;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		if (t == d) return b + c;
+		return c * 1.001 * (-pow(2, -10 * t / d) + 1) + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		if (t == 0) return b;
+		if (t == d) return b + c;
+		t = t / d * 2;
+		if (t < 1) return c / 2 * pow(2, 10 * (t - 1)) + b - c * 0.0005;
+		return c / 2 * 1.0005 * (-pow(2, -10 * (t - 1)) + 2) + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// elastic
+///////////////////////////////////////////////////////////////////////////
+namespace elastic {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+        if (t == 0) return b;
+		if ((t /= d) == 1) return b + c;
+        float p = d * 0.3f;
+        float a = c;
+        float s = p / 4;
+        float postFix = a * pow(2,10 * (t -= 1)); // this is a fix, again, with post-increment operators
+        return -(postFix * sin((t * d - s) * (2 * pi) / p )) + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+        if (t == 0) return b;
+		if ((t /= d) == 1) return b + c;
+        float p = d * 0.3f;
+        float a = c;
+        float s = p / 4;
+        return (a * pow(2, -10 * t) * sin((t * d - s) * (2 * pi) / p ) + c + b);
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+        if (t == 0) return b;
+		if ((t /= d / 2) == 2) return b + c;
+        float p = d * (0.3f * 1.5f);
+        float a = c;
+        float s = p / 4;
+
+        if (t < 1) {
+			float postFix = a * pow(2, 10 * (t -= 1)); // postIncrement is evil
+            return -0.5f * (postFix * sin((t * d - s) * (2 * pi) / p)) + b;
+        }
+        float postFix = a * pow(2, -10 * (t -= 1)); // postIncrement is evil
+        return postFix * sin((t * d - s) * (2 * pi) / p ) * 0.5f + c + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// cubic
+///////////////////////////////////////////////////////////////////////////
+namespace cubic {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * (t /= d) * t * t + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * ((t = t / d - 1) * t * t + 1) + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
+		return c / 2 * ((t -= 2) * t * t + 2) + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// circ
+///////////////////////////////////////////////////////////////////////////
+namespace circ {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return -c * (sqrt(1 - (t /= d) * t) - 1) + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c * sqrt(1 - (t = t / d - 1) * t) + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		if ((t /= d / 2) < 1) return -c / 2 * (sqrt(1 - t * t) - 1) + b;
+		return c / 2 * (sqrt(1 - t * (t -= 2)) + 1) + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// bounce
+///////////////////////////////////////////////////////////////////////////
+namespace bounce {
+	static real_t out(real_t t, real_t b, real_t c, real_t d);
+
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return c - out(d - t, 0, c, d) + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+		if ((t /= d) < (1 / 2.75f)) {
+			return c*(7.5625f*t*t) + b;
+		} else if (t < (2/2.75f)) {
+			float postFix = t-=(1.5f/2.75f);
+			return c*(7.5625f*(postFix)*t + .75f) + b;
+		} else if (t < (2.5/2.75)) {
+			float postFix = t-=(2.25f/2.75f);
+			return c*(7.5625f*(postFix)*t + .9375f) + b;
+		} else {
+			float postFix = t-=(2.625f/2.75f);
+			return c*(7.5625f*(postFix)*t + .984375f) + b;
+		}
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? in(t * 2, b, c / 2, d)
+			: out((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+///////////////////////////////////////////////////////////////////////////
+// back
+///////////////////////////////////////////////////////////////////////////
+namespace back {
+	static real_t in(real_t t, real_t b, real_t c, real_t d)
+	{
+        float s = 1.70158f;
+        float postFix = t /= d;
+        return c * (postFix) * t * ((s + 1) * t - s) + b;
+	}
+
+	static real_t out(real_t t, real_t b, real_t c, real_t d)
+	{
+        float s = 1.70158f;
+        return c * ((t = t / d- 1) * t * ((s + 1) * t + s) + 1) + b;
+	}
+
+	static real_t in_out(real_t t, real_t b, real_t c, real_t d)
+	{
+		float s = 1.70158f;
+		if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= (1.525f)) + 1) * t - s)) + b;
+		float postFix = t -= 2;
+		return c / 2 * ((postFix) * t * (((s *= (1.525f)) + 1) * t + s) + 2) + b;
+	}
+
+	static real_t out_in(real_t t, real_t b, real_t c, real_t d)
+	{
+		return (t < d / 2)
+			? out(t * 2, b, c / 2, d)
+			: in((t * 2) - d, b + c / 2, c / 2, d)
+		;
+	}
+};
+
+Tween::interpolater Tween::interpolaters[Tween::TRANS_COUNT][Tween::EASE_COUNT] = {
+	{ &linear::in, &linear::out, &linear::in_out, &linear::out_in },
+	{ &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 },
+};
+
+real_t Tween::_run_equation(TransitionType p_trans_type, EaseType p_ease_type, real_t t, real_t b, real_t c, real_t d) {
+
+	interpolater cb = interpolaters[p_trans_type][p_ease_type];
+	ERR_FAIL_COND_V(cb == NULL, b);
+	return cb(t, b, c, d);
+}
+

scene/register_scene_types.cpp

@@ -108,6 +108,7 @@
 
 #include "scene/animation/animation_player.h"
 #include "scene/animation/animation_tree_player.h"
+#include "scene/animation/tween.h"
 #include "scene/main/scene_main_loop.h"
 #include "scene/main/resource_preloader.h"
 #include "scene/resources/packed_scene.h"
@@ -369,6 +370,7 @@ void register_scene_types() {
 	ObjectTypeDB::register_type<Spatial>();
 	ObjectTypeDB::register_type<Skeleton>();
 	ObjectTypeDB::register_type<AnimationPlayer>();
+	ObjectTypeDB::register_type<Tween>();
 
 	OS::get_singleton()->yield(); //may take time to init