-Added lookat/get_angle_to functions in 2D, and a demo, closes #1843

-Added get_viewport().get_mouse_pos() to replace Input.get_mouse_pos(), closes #1838

8 files changed, 71 insertions, 0 deletions

diff --git a/demos/2d/lookat/arrow.png b/demos/2d/lookat/arrow.png
new file mode 100644
index 0000000000..25db91e8d1
--- /dev/null
+++ b/demos/2d/lookat/arrow.png
diff --git a/demos/2d/lookat/engine.cfg b/demos/2d/lookat/engine.cfg
new file mode 100644
index 0000000000..56917a39ec
--- /dev/null
+++ b/demos/2d/lookat/engine.cfg
@@ -0,0 +1,4 @@
+[application]
+
+name="Look At Pointer"
+main_scene="res://lookat.scn"
diff --git a/demos/2d/lookat/lookat.gd b/demos/2d/lookat/lookat.gd
new file mode 100644
index 0000000000..742c5b0671
--- /dev/null
+++ b/demos/2d/lookat/lookat.gd
@@ -0,0 +1,43 @@
+
+extends Sprite
+
+# member variables here, example:
+# var a=2
+# var b="textvar"
+
+const MODE_DIRECT=0
+const MODE_CONSTANT=1
+const MODE_SMOOTH=2
+
+const ROTATION_SPEED = 1
+const SMOOTH_SPEED = 2.0
+
+export(int,"Direct","Constant","Smooth") var mode=MODE_DIRECT
+
+func _process(delta):
+	var mpos = get_viewport().get_mouse_pos()
+	
+	if (mode==MODE_DIRECT):
+	
+		look_at(mpos)
+		
+	elif (mode==MODE_CONSTANT):
+	
+		var ang = get_angle_to(mpos)
+		var s = sign(ang)
+		ang=abs(ang)
+		
+		rotate( min(ang,ROTATION_SPEED*delta)*s )
+		
+	elif (mode==MODE_SMOOTH):
+	
+		var ang = get_angle_to(mpos)		
+		
+		rotate( ang*delta*SMOOTH_SPEED )
+
+func _ready():
+	# Initialization here
+	set_process(true)
+	pass
+
+
diff --git a/demos/2d/lookat/lookat.scn b/demos/2d/lookat/lookat.scn
new file mode 100644
index 0000000000..880070b4c7
--- /dev/null
+++ b/demos/2d/lookat/lookat.scn
diff --git a/scene/2d/node_2d.cpp b/scene/2d/node_2d.cpp
index fc5be255ce..99c33c787d 100644
--- a/scene/2d/node_2d.cpp
+++ b/scene/2d/node_2d.cpp
@@ -346,6 +346,17 @@ Matrix32 Node2D::get_relative_transform(const Node *p_parent) const {
 		return parent_2d->get_relative_transform(p_parent) * get_transform();
 }
 
+
+void Node2D::look_at(const Vector2& p_pos) {
+
+	rotate(get_angle_to(p_pos));
+}
+
+float Node2D::get_angle_to(const Vector2& p_pos) const {
+
+	return (get_global_transform().affine_inverse().xform(p_pos)).atan2();
+}
+
 void Node2D::_bind_methods() {
 
 
@@ -374,6 +385,9 @@ void Node2D::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("set_transform","xform"),&Node2D::set_transform);
 	ObjectTypeDB::bind_method(_MD("set_global_transform","xform"),&Node2D::set_global_transform);
 
+	ObjectTypeDB::bind_method(_MD("look_at","point"),&Node2D::look_at);
+	ObjectTypeDB::bind_method(_MD("get_angle_to","point"),&Node2D::get_angle_to);
+
 	ObjectTypeDB::bind_method(_MD("set_z","z"),&Node2D::set_z);
 	ObjectTypeDB::bind_method(_MD("get_z"),&Node2D::get_z);
 
diff --git a/scene/2d/node_2d.h b/scene/2d/node_2d.h
index 74612b3c6d..8efce33cda 100644
--- a/scene/2d/node_2d.h
+++ b/scene/2d/node_2d.h
@@ -93,6 +93,9 @@ public:
 	void set_z(int p_z);
 	int get_z() const;
 
+	void look_at(const Vector2& p_pos);
+	float get_angle_to(const Vector2& p_pos) const;
+
 	void set_z_as_relative(bool p_enabled);
 	bool is_z_relative() const;
 
diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 4d9feb3af1..3bb64e54c6 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -1177,6 +1177,11 @@ void Viewport::_vp_unhandled_input(const InputEvent& p_ev) {
 
 }
 
+Vector2 Viewport::get_mouse_pos() const {
+
+	return (get_final_transform().affine_inverse() * _get_input_pre_xform()).xform(Input::get_singleton()->get_mouse_pos());
+}
+
 void Viewport::warp_mouse(const Vector2& p_pos) {
 
 	Vector2 gpos = (get_final_transform().affine_inverse() * _get_input_pre_xform()).affine_inverse().xform(p_pos);
@@ -1377,6 +1382,7 @@ void Viewport::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("is_audio_listener_2d","enable"), &Viewport::is_audio_listener_2d);
 	ObjectTypeDB::bind_method(_MD("set_render_target_to_screen_rect"), &Viewport::set_render_target_to_screen_rect);
 
+	ObjectTypeDB::bind_method(_MD("get_mouse_pos"), &Viewport::get_mouse_pos);
 	ObjectTypeDB::bind_method(_MD("warp_mouse","to_pos"), &Viewport::warp_mouse);
 
 	ADD_PROPERTY( PropertyInfo(Variant::RECT2,"rect"), _SCS("set_rect"), _SCS("get_rect") );
diff --git a/scene/main/viewport.h b/scene/main/viewport.h
index fba6725610..c3c339ac5d 100644
--- a/scene/main/viewport.h
+++ b/scene/main/viewport.h
@@ -252,6 +252,7 @@ public:
 	void set_render_target_to_screen_rect(const Rect2& p_rect);
 	Rect2 get_render_target_to_screen_rect() const;
 
+	Vector2 get_mouse_pos() const;
 	void warp_mouse(const Vector2& p_pos);
 
 	void set_physics_object_picking(bool p_enable);