refactored droplet mode-ing

scenes/model.tscn

@@ -93,11 +93,11 @@ shape = SubResource("RectangleShape2D_jsxgm")
 debug_color = Color(0.5959702, 0.54461277, 0.08352526, 0.41960785)
 
 [node name="big_bucket" type="Node2D" parent="." unique_id=1340688088]
-position = Vector2(-115, 91)
+position = Vector2(360, 460)
 metadata/_edit_group_ = true
 
 [node name="platform4" type="StaticBody2D" parent="big_bucket" unique_id=1712494835]
-position = Vector2(450.99997, 440)
+position = Vector2(11, 74)
 rotation = 1.5717075
 metadata/_edit_group_ = true
 
@@ -107,7 +107,7 @@ shape = SubResource("RectangleShape2D_jsxgm")
 debug_color = Color(0.5959702, 0.54461277, 0.08352526, 0.41960785)
 
 [node name="platform5" type="StaticBody2D" parent="big_bucket" unique_id=1995856626]
-position = Vector2(512, 498.99997)
+position = Vector2(72.00003, 132.99997)
 rotation = 0.0012022424
 metadata/_edit_group_ = true
 
@@ -117,7 +117,7 @@ shape = SubResource("RectangleShape2D_jsxgm")
 debug_color = Color(0.5959702, 0.54461277, 0.08352526, 0.41960785)
 
 [node name="platform7" type="StaticBody2D" parent="big_bucket" unique_id=146253526]
-position = Vector2(650, 498.99997)
+position = Vector2(210.00003, 132.99997)
 rotation = 0.00064454623
 metadata/_edit_group_ = true
 
@@ -127,7 +127,7 @@ shape = SubResource("RectangleShape2D_jsxgm")
 debug_color = Color(0.5959702, 0.54461277, 0.08352526, 0.41960785)
 
 [node name="platform6" type="StaticBody2D" parent="big_bucket" unique_id=749418854]
-position = Vector2(710.00006, 437.00003)
+position = Vector2(270.0001, 71.00003)
 rotation = -1.5774848
 metadata/_edit_group_ = true
 

scripts/droplet.gd

@@ -1,26 +1,65 @@
 class_name Droplet extends RigidBody2D
 
-# bounce mode seems to settle with a consistent surface, but is erratic
+# default mode: a bit sluggish, tendency to pile
-# stick mode seems to make sand castles, but is very calm
+# bounce mode: doesn't settle down at all, but keeps flat surface
-enum Mode { BOUNCE, STICK }
+# bounce_wip: wonky AF, probably due to extra compute
-const mode: Mode = Mode.BOUNCE
+# stick mode: piles tightly, very calm
+# wip mode: interesting, the base stays together, and the new one jumps into place
+enum Mode { DEFAULT, BOUNCE, BOUNCE_WIP, STICK, WIP }
+const MODE: Mode = Mode.WIP
+
+class DropletConfig:
+	var bounce
+	var friction
+	var linear_damp
+	var angular_damp
+	func _init(mode):
+		linear_damp = ProjectSettings.get_setting("physics/2d/default_linear_damp")
+		angular_damp = ProjectSettings.get_setting("physics/2d/default_angular_damp")
+		if mode == Mode.DEFAULT:
+			bounce = 0
+			friction = 0.1
+		elif mode == Mode.BOUNCE:
+			bounce = 0.5
+			friction = 0.1
+		elif mode == Mode.BOUNCE_WIP:
+			bounce = 0.5
+			friction = 0.1
+		elif mode == Mode.STICK:
+			bounce = 0.1
+			friction = 0.3
+		else: # WIP
+			bounce = 0.1
+			friction = 1
 
 func _ready():
+	var config = DropletConfig.new(MODE)
 	var mat = PhysicsMaterial.new()
-	mat.bounce = .1 if mode == Mode.BOUNCE else 0
+	mat.bounce = config.bounce
-	mat.friction = 0.0
+	mat.friction = config.friction
 	physics_material_override = mat
-	
+	linear_damp = config.linear_damp
+	angular_damp = config.angular_damp
 	# setup body entered signal, seems to also matter for STICK mode
+	if not MODE == Mode.DEFAULT:
 		contact_monitor = true
 		max_contacts_reported = 10
 		body_entered.connect(_on_body_entered)
 
 func _physics_process(delta):
-	pass
+	if MODE == Mode.WIP:
+		for body in get_colliding_bodies():
+			if body is RigidBody2D:
+				var dir = global_position - body.global_position
+				var dist = dir.length()
+				if dist < 64:
+					## IIUC: should act to keep close droplets together
+					var force = -dir.normalized() * (1.0 - dist / 64.0)
+					body.apply_central_force(force * 100)
 
 func _integrate_forces(state):
-	if mode == Mode.STICK:
+	# this is probably overkill since we are overriding the default physics engine
+	if MODE == Mode.STICK:
 		var v = state.linear_velocity
 		var contacts = state.get_contact_count()
 		for i in range(contacts):
@@ -34,7 +73,7 @@ func _integrate_forces(state):
 				body.apply_central_impulse(normal * v.length() * (other_damp/contacts))
 
 func _on_body_entered(body):
-	if mode == Mode.BOUNCE:
+	if MODE == Mode.BOUNCE_WIP:
 		# trying to elicit stronger response from rigidBody that was struck
 		# ends up being kind of erratic
 		# at damp_factor .75: settles laterally, but erratic past half-full

scripts/model.gd

@@ -3,6 +3,7 @@ class_name Model extends Node2D
 const PERIOD: int = 20 # smaller makes droplets faster
 var CURRENT_TIME: int = 0
 var last_droplet: int = 0
+const DROP_PT_X = 450
 
 func _ready():
 	pass # Replace with function body.
@@ -15,5 +16,5 @@ func _process(delta: float):
 		var droplet = preload("res://scenes/droplet.tscn").instantiate()
 		var shape = droplet.get_node("CollisionShape2D")
 		shape.shape.radius = 5
-		droplet.global_position = Vector2(450, 100)		
+		droplet.global_position = Vector2(DROP_PT_X, 100)
 		add_child(droplet)