finish zoom/scroll

Camera2D.gd

@@ -1,37 +1,30 @@
 extends Camera2D
 
-var zoom_speed=Vector2(.2,.2)
-var scrolling=false;
+var last_mouse_position = Vector2.ZERO
 
-# Called when the node enters the scene tree for the first time.
 func _ready():
-	pass # Replace with function body.
+	set_process_input(true)
 
 func _input(event):
 	if event is InputEventMouseButton:
-		if event.is_pressed():
-			if event.button_index==MOUSE_BUTTON_WHEEL_UP:
-				zoom+=zoom_speed
-			if event.button_index==MOUSE_BUTTON_WHEEL_DOWN:
-				zoom-=zoom_speed
-			if event.button_index==MOUSE_BUTTON_MIDDLE:
-				scrolling=true
-		if event.is_released():
-			if event.button_index==MOUSE_BUTTON_MIDDLE:
-				scrolling=false
-	if event is InputEventMouseMotion:
-		if scrolling:
-			offset-=event.velocity*0.1
+		if event.button_index == MOUSE_BUTTON_MIDDLE and event.pressed:
+			last_mouse_position = get_global_mouse_position()
+		elif event.button_index == MOUSE_BUTTON_MIDDLE and not event.pressed:
+			last_mouse_position = Vector2.ZERO
+		if event.button_index == MOUSE_BUTTON_WHEEL_DOWN and event.pressed:
+			zoom_towards_mouse(Vector2(0.9, 0.9))
+		elif event.button_index == MOUSE_BUTTON_WHEEL_UP and event.pressed:
+			zoom_towards_mouse(Vector2(1.1, 1.1))
 
-# Called every frame. 'delta' is the elapsed time since the previous frame.
-func _process(delta):
-	if Input.is_action_pressed('move_up'):
-		offset.y -= 1
-	if Input.is_action_pressed('move_down'):
-		offset.y += 1
-	if Input.is_action_pressed('move_left'):
-		offset.x -= 1
-	if Input.is_action_pressed('move_right'):
-		offset.x += 1
-#	if Input.is_action_just_pressed('take'):
-#		drop()
+	elif event is InputEventMouseMotion:
+		if last_mouse_position != Vector2.ZERO:
+			var mouse_motion = event.relative
+			var drag_offset = mouse_motion / zoom
+			position -= drag_offset
+			last_mouse_position = get_global_mouse_position()
+
+func zoom_towards_mouse(zoom_factor):
+	var previous_mouse_position := get_local_mouse_position()
+	zoom *= zoom_factor
+	var diff = previous_mouse_position - get_local_mouse_position()
+	offset += diff