impl camera

PanningCamera/PanningCamera2D.gd

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+extends Camera2D
+class_name PanningCamera2D
+
+@export var MIN_ZOOM: float = 0.5
+@export var MAX_ZOOM: float = 3.0
+@export var ZOOM_RATE: float = 8.0
+@export var ZOOM_INCREMENT: float = 0.1
+
+var target_zoom: float = 1.0
+var reset_pos: Vector2 = Vector2(0.0, 0.0)
+
+
+func _physics_process(delta: float) -> void:
+	zoom = lerp(zoom, target_zoom * Vector2.ONE, ZOOM_RATE * delta)
+	set_physics_process(not is_equal_approx(zoom.x, target_zoom))
+
+
+func _unhandled_input(event: InputEvent) -> void:
+	if event is InputEventMouseButton:
+		if event.is_pressed():
+			if event.button_index == MOUSE_BUTTON_WHEEL_UP:
+				zoom_in()
+			if event.button_index == MOUSE_BUTTON_WHEEL_DOWN:
+				zoom_out()
+	if event is InputEventMouseMotion:
+		if event.button_mask == MOUSE_BUTTON_MASK_LEFT:
+			position -= event.relative / zoom
+	if event is InputEventKey:
+		if event.keycode == KEY_SPACE:
+			target_zoom = 1.0
+			zoom = Vector2(1.0, 1.0)
+			position = reset_pos
+
+
+func zoom_in() -> void:
+	target_zoom = max(target_zoom - ZOOM_INCREMENT, MIN_ZOOM)
+	set_physics_process(true)
+
+
+func zoom_out() -> void:
+	target_zoom = min(target_zoom + ZOOM_INCREMENT, MAX_ZOOM)
+	set_physics_process(true)

main.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://djirenq1psstj"]
+
+[ext_resource type="Script" path="res://PanningCamera/PanningCamera2D.gd" id="1_vtapg"]
+[ext_resource type="PackedScene" uid="uid://qipfodwbk1gf" path="res://Field/field.tscn" id="1_y0qkv"]
+
+[node name="Main" type="Node2D"]
+
+[node name="Camera2D" type="Camera2D" parent="."]
+script = ExtResource("1_vtapg")
+MIN_ZOOM = null
+MAX_ZOOM = null
+ZOOM_RATE = 5.0
+
+[node name="Field" parent="." instance=ExtResource("1_y0qkv")]
+rotation = 0.523599
+skew = 0.523599