From 60e08f19991a325bb85062c20f80649b3be00369 Mon Sep 17 00:00:00 2001
From: Federico Ciuffardi <federico.ciuffardi@outlook.com>
Date: Tue, 18 May 2021 17:44:21 -0300
Subject: [PATCH] Fix limits for zoom and move

---
 Demo.tscn     |  5 +++++
 GCC2D.gd      | 42 ++++++++++++++++++++++++++++++++++++++----
 project.godot | 12 ++++++------
 3 files changed, 49 insertions(+), 10 deletions(-)

diff --git a/Demo.tscn b/Demo.tscn
index d868bfd..a26bd89 100644
--- a/Demo.tscn
+++ b/Demo.tscn
@@ -9,3 +9,8 @@
 texture = ExtResource( 1 )
 
 [node name="GCC2D" parent="." instance=ExtResource( 2 )]
+anchor_mode = 0
+limit_left = -1920
+limit_top = -1080
+limit_right = 1920
+limit_bottom = 1080
diff --git a/GCC2D.gd b/GCC2D.gd
index 7cdbe70..962ee54 100644
--- a/GCC2D.gd
+++ b/GCC2D.gd
@@ -8,6 +8,39 @@ export(int,"disabled","pinch") var zoom_gesture = 1
 export(int,"disabled","twist") var rotation_gesture = 1
 export(int,"disabled","single_drag","multi_drag") var movement_gesture = 2
 
+func set_position(p):
+	var position_limit_right
+	var position_limit_left
+	var position_limit_top
+	var position_limit_bottom
+	var camera_size = get_camera_size()*zoom
+	if anchor_mode == ANCHOR_MODE_FIXED_TOP_LEFT:
+		position_limit_right  = limit_right - camera_size.x
+		position_limit_left   = limit_left 
+		position_limit_top    = limit_top
+		position_limit_bottom = limit_bottom - camera_size.y
+	elif anchor_mode ==  ANCHOR_MODE_DRAG_CENTER:
+		position_limit_right  = limit_right  - camera_size.x/2
+		position_limit_left   = limit_left   + camera_size.x/2
+		position_limit_top    = limit_top    + camera_size.y/2
+		position_limit_bottom = limit_bottom - camera_size.y/2
+	if(position_limit_right < position_limit_left or position_limit_bottom < position_limit_top):
+		return false
+	position = p
+	if(position.x > position_limit_right):
+		position.x = position_limit_right
+	if(position.x < position_limit_left):
+		position.x = position_limit_left
+	if(position.y < position_limit_top):
+		position.y = position_limit_top
+	if(position.y > position_limit_bottom):
+		position.y = position_limit_bottom
+	print(position)
+	print("horizontal limits: ", position_limit_left," , ", position_limit_right )
+	print("vertical limits: ", position_limit_top," , ", position_limit_bottom )
+	return true
+
+
 func _unhandled_input(e):
 	if (e is InputEventMultiScreenDrag and  movement_gesture == 2
 		or e is InputEventSingleScreenDrag and  movement_gesture == 1):
@@ -24,8 +57,8 @@ func camera2global(position):
 	return camera_center + (from_camera_center_pos*zoom).rotated(rotation)
 
 func _move(event):
-	position -= (event.relative*zoom).rotated(rotation)
-	
+	set_position(position - (event.relative*zoom).rotated(rotation))
+
 func _zoom(event):
 	var li = event.distance
 	var lf = event.distance + event.relative
@@ -43,13 +76,14 @@ func _zoom(event):
 		zd = zf - zi
 	
 	var from_camera_center_pos = event.position - get_camera_center_offset()
-	position -= (from_camera_center_pos*zd).rotated(rotation)
 	zoom = zf*Vector2.ONE
+	if(!set_position(position - (from_camera_center_pos*zd).rotated(rotation))):
+		zoom = zi*Vector2.ONE
 
 func _rotate(event):
 	var fccp = (event.position - get_camera_center_offset()) # from_camera_center_pos = fccp
 	var fccp_op_rot =  -fccp.rotated(event.relative)
-	position -= ((fccp_op_rot + fccp)*zoom).rotated(rotation-event.relative)
+	set_position(position - ((fccp_op_rot + fccp)*zoom).rotated(rotation-event.relative))
 	rotation -= event.relative
 
 func get_camera_center_offset():
diff --git a/project.godot b/project.godot
index e15486c..5540feb 100644
--- a/project.godot
+++ b/project.godot
@@ -9,32 +9,32 @@
 config_version=4
 
 _global_script_classes=[ {
-"base": "Reference",
+"base": "InputEventAction",
 "class": "InputEventMultiScreenDrag",
 "language": "GDScript",
 "path": "res://GDTIM-v1_1_0/CustomInputEvents/InputEventMultiScreenDrag.gd"
 }, {
-"base": "Reference",
+"base": "InputEventAction",
 "class": "InputEventScreenPinch",
 "language": "GDScript",
 "path": "res://GDTIM-v1_1_0/CustomInputEvents/InputEventScreenPinch.gd"
 }, {
-"base": "Reference",
+"base": "InputEventAction",
 "class": "InputEventScreenTwist",
 "language": "GDScript",
 "path": "res://GDTIM-v1_1_0/CustomInputEvents/InputEventScreenTwist.gd"
 }, {
-"base": "Reference",
+"base": "InputEventAction",
 "class": "InputEventSingleScreenDrag",
 "language": "GDScript",
 "path": "res://GDTIM-v1_1_0/CustomInputEvents/InputEventSingleScreenDrag.gd"
 }, {
-"base": "Reference",
+"base": "InputEventAction",
 "class": "InputEventSingleScreenTap",
 "language": "GDScript",
 "path": "res://GDTIM-v1_1_0/CustomInputEvents/InputEventSingleScreenTap.gd"
 }, {
-"base": "Reference",
+"base": "InputEventAction",
 "class": "InputEventSingleScreenTouch",
 "language": "GDScript",
 "path": "res://GDTIM-v1_1_0/CustomInputEvents/InputEventSingleScreenTouch.gd"