Merge pull request #12 from endlessm/multiplayer-camera

Multiplayer camera

Author: starnight

doc/MODS.md

@@ -144,6 +144,10 @@ Duplicate the `Player` node. Move it next to the existing player. Then
 change the Player to "Two" in the duplicated one. Now the game is
 multiplayer.
 
+You will notice that the camera is following one of the player characters. So
+try disabling the `Camera2D` node that's a child of the `Player` node. And then
+enable the `MultiplayerCamera` node that's at the bottom of the Scene Dock.
+
 ### Player and flag appearance
 
 Click on the `Player` node. In the inspector, observe where it says `Sprite

main.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=13 format=3 uid="uid://dhcpt1kt8cs0g"]
+[gd_scene load_steps=14 format=3 uid="uid://dhcpt1kt8cs0g"]
 
 [ext_resource type="PackedScene" uid="uid://8st4scqt06l8" path="res://components/player/player.tscn" id="2_7yl00"]
 [ext_resource type="PackedScene" uid="uid://jnrusvm3gric" path="res://spaces/background.tscn" id="2_tb5a2"]
@@ -12,6 +12,7 @@
 [ext_resource type="PackedScene" uid="uid://dk0xon0k7ga23" path="res://components/enemy/enemy.tscn" id="9_l6smt"]
 [ext_resource type="SpriteFrames" uid="uid://bo581k1esb50n" path="res://components/player/spriteframes-red.tres" id="9_qmofe"]
 [ext_resource type="PackedScene" uid="uid://beuisy5yrw0bq" path="res://components/flag/flag.tscn" id="12_dkbog"]
+[ext_resource type="Script" path="res://scripts/multiplayer_camera.gd" id="13_0d2mj"]
 
 [node name="Main" type="Node2D"]
 
@@ -221,3 +222,11 @@ position = Vector2(4096, 960)
 
 [node name="Flag" parent="." instance=ExtResource("12_dkbog")]
 position = Vector2(4192, 320)
+
+[node name="MultiplayerCamera" type="Camera2D" parent="."]
+position = Vector2(0, 15)
+enabled = false
+limit_left = 0
+limit_bottom = 1080
+position_smoothing_enabled = true
+script = ExtResource("13_0d2mj")

scripts/multiplayer_camera.gd

@@ -0,0 +1,45 @@
+class_name MultiplayerCamera
+extends Camera2D
+
+const FRAME_MARGIN: int = 128
+const MIN_ZOOM: float = 1.0
+const MAX_ZOOM: float = 0.4
+
+var player_characters: Array[Player]
+
+@onready var viewport_size: Vector2 = get_viewport_rect().size
+
+
+func _ready():
+	if not enabled or not is_current():
+		set_process(false)
+		return
+
+	for pc in get_tree().get_nodes_in_group("players"):
+		player_characters.append(pc as Player)
+
+
+func _physics_process(delta: float):
+	if not player_characters:
+		return
+
+	var new_position: Vector2 = Vector2.ZERO
+	for pc: Player in player_characters:
+		new_position += pc.position
+	new_position /= player_characters.size()
+	if position_smoothing_enabled:
+		position = lerp(position, new_position, position_smoothing_speed * delta)
+	else:
+		position = new_position
+
+	var frame = Rect2(position, Vector2.ONE)
+	for pc: Player in player_characters:
+		frame = frame.expand(pc.position)
+	frame = frame.grow_individual(FRAME_MARGIN, FRAME_MARGIN, FRAME_MARGIN, FRAME_MARGIN)
+
+	var new_zoom: float
+	if frame.size.x > frame.size.y * viewport_size.aspect():
+		new_zoom = clamp(viewport_size.x / frame.size.x, MAX_ZOOM, MIN_ZOOM)
+	else:
+		new_zoom = clamp(viewport_size.y / frame.size.y, MAX_ZOOM, MIN_ZOOM)
+	zoom = lerp(zoom, Vector2.ONE * new_zoom, 0.5)

spaces/background.tscn

@@ -16,11 +16,24 @@ fill_to = Vector2(0, 1)
 
 [node name="Background" type="ParallaxBackground"]
 follow_viewport_enabled = true
+scroll_ignore_camera_zoom = true
 script = ExtResource("1_1jh5j")
 
 [node name="ParallaxLayer" type="ParallaxLayer" parent="."]
 unique_name_in_owner = true
-motion_scale = Vector2(-1, -1)
+motion_scale = Vector2(0, 0)
+motion_mirroring = Vector2(1600, 0)
+
+[node name="ColorRect" type="ColorRect" parent="ParallaxLayer"]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_top = -2352.0
+offset_right = 5129.0
+offset_bottom = 98.0
+grow_horizontal = 2
+grow_vertical = 2
+color = Color(0.980392, 0.980392, 0.980392, 1)
 
 [node name="Sprite2D" type="Sprite2D" parent="ParallaxLayer"]
 texture = SubResource("GradientTexture2D_ljotv")