From bd197168c39551c3456099ed2a39375a8442483f Mon Sep 17 00:00:00 2001
From: David Luevano Alvarado <david@luevano.xyz>
Date: Tue, 31 May 2022 03:49:28 -0600
Subject: working snake generation and path following, minor refactor

---
 .../actors/snake/scripts/generic_segment.gd        |  8 +++++
 src/entities/actors/snake/scripts/head.gd          | 30 ++++++++++++++++
 src/entities/actors/snake/scripts/snake.gd         | 42 ++++++++++++++++++++++
 3 files changed, 80 insertions(+)
 create mode 100644 src/entities/actors/snake/scripts/generic_segment.gd
 create mode 100644 src/entities/actors/snake/scripts/head.gd
 create mode 100644 src/entities/actors/snake/scripts/snake.gd

(limited to 'src/entities/actors/snake/scripts')

diff --git a/src/entities/actors/snake/scripts/generic_segment.gd b/src/entities/actors/snake/scripts/generic_segment.gd
new file mode 100644
index 0000000..ec34f43
--- /dev/null
+++ b/src/entities/actors/snake/scripts/generic_segment.gd
@@ -0,0 +1,8 @@
+extends PathFollow2D
+
+export(String, "body", "tail") var TYPE: String = "body"
+var speed: float = Global.SNAKE_SPEED
+
+
+func _process(delta: float) -> void:
+	offset += speed * delta
\ No newline at end of file
diff --git a/src/entities/actors/snake/scripts/head.gd b/src/entities/actors/snake/scripts/head.gd
new file mode 100644
index 0000000..ea28f74
--- /dev/null
+++ b/src/entities/actors/snake/scripts/head.gd
@@ -0,0 +1,30 @@
+extends Node2D
+
+var speed: float = Global.SNAKE_SPEED
+var rot_speed: float = Global.SNAKE_ROT_SPEED
+var position_update_interval: float = Global.SNAKE_POSITION_UPDATE_INTERVAL
+
+var _direction: Vector2 = Vector2.UP
+var _time_elapsed: float = 0.0
+
+
+func _process(delta: float) -> void:
+	if Input.is_action_pressed("move_left"):
+		# _direction = _direction.rotated(deg2rad(-ROT_SPEED))
+		rotate(deg2rad(-rot_speed * delta))
+	if Input.is_action_pressed("move_right"):
+		# _direction = _direction.rotated(deg2rad(ROT_SPEED))
+		rotate(deg2rad(rot_speed * delta))
+
+	move_local_x(_direction.x * speed * delta)
+	move_local_y(_direction.y * speed * delta)
+
+	_handle_time_elapsed(delta)
+
+
+# using a timer is not recommended for < 0.01
+func _handle_time_elapsed(delta: float) -> void:
+	if _time_elapsed >= position_update_interval:
+		Event.emit_signal("new_curve_point", global_position)
+		_time_elapsed = 0.0
+	_time_elapsed += delta
diff --git a/src/entities/actors/snake/scripts/snake.gd b/src/entities/actors/snake/scripts/snake.gd
new file mode 100644
index 0000000..e604011
--- /dev/null
+++ b/src/entities/actors/snake/scripts/snake.gd
@@ -0,0 +1,42 @@
+class_name Snake
+extends Node2D
+
+export(PackedScene) var BODY_SEGMENT_NP: PackedScene
+export(PackedScene) var TAIL_SEGMENT_NP: PackedScene
+
+onready var path: Path2D = $Path
+
+var current_body_segments: int = 0
+var max_body_segments: int = 1
+var body_segment_size: float = 16.0
+
+
+func _ready():
+	Event.connect("new_curve_point", self, "_on_Head_new_curve_point")
+
+
+func _draw() -> void:
+	if path.curve.get_baked_points().size() >= 2:
+		draw_polyline(path.curve.get_baked_points(), Color.aquamarine, 1, true)
+
+
+func add_point_to_curve(coordinates: Vector2) -> void:
+	path.curve.add_point(coordinates)
+	# update call is to draw curve as there are new points
+	update()
+
+	if current_body_segments < max_body_segments:
+		add_snake_segment(BODY_SEGMENT_NP)
+	elif current_body_segments == max_body_segments:
+		add_snake_segment(TAIL_SEGMENT_NP)
+
+
+func add_snake_segment(type: PackedScene) -> void:
+	if path.curve.get_baked_length() >= (current_body_segments + 1.0) * body_segment_size:
+		var _temp_body_segment: PathFollow2D = type.instance()
+		path.add_child(_temp_body_segment)
+		current_body_segments += 1
+
+
+func _on_Head_new_curve_point(coordinates: Vector2) -> void:
+	add_point_to_curve(coordinates)
-- 
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