From 65be853fff43b8b0203856fe98b64c190fd271f2 Mon Sep 17 00:00:00 2001
From: David Luevano Alvarado <david@luevano.xyz>
Date: Thu, 2 Jun 2022 02:44:18 -0600
Subject: update gogodot jam3 entry with food system
---
blog/src/g/gogodot_jam3_devlog_1.md | 74 ++++++++++++++++++++++++++++++++++++-
1 file changed, 72 insertions(+), 2 deletions(-)
(limited to 'blog/src/g')
diff --git a/blog/src/g/gogodot_jam3_devlog_1.md b/blog/src/g/gogodot_jam3_devlog_1.md
index edd4868..0c177c4 100644
--- a/blog/src/g/gogodot_jam3_devlog_1.md
+++ b/blog/src/g/gogodot_jam3_devlog_1.md
@@ -170,7 +170,7 @@ Select the *Snake* node and add the *Body* and *Tail* scene to the parameters, r
-Now, we need to handle adding body parts after the snake is complete and already moved for a bit, this will require a queue so we can add part by part in the case that we eat multiple pieces of food in a short period of time. For this we need to add some signals: `snake_add_new_segment(type)`, `snake_added_new_segment(type)`, `snake_added_initial_segments` and use them when makes sense. Now we need to add the following:
+Now, we need to handle adding body parts after the snake is complete and already moved for a bit, this will require a queue so we can add part by part in the case that we eat multiple pieces of food in a short period of time. For this we need to add some signals: `snake_adding_new_segment(type)`, `snake_added_new_segment(type)`, `snake_added_initial_segments` and use them when makes sense. Now we need to add the following:
```gdscript
var body_segment_stack: Array
@@ -221,7 +221,77 @@ With everything implemented and connected accordingly then we can add segments o
-For now, this should be enough, I'll add more stuff as needed as I go.
+For now, this should be enough, I'll add more stuff as needed as I go. Last thing is that after finished testing that the movement felt ok, I just added a way to stop the snake whenever it collides with itself by using the following code (and the signal `snake_segment_body_entered(body)`) in a `main.gd` script that is the entry point for the game:
+
+```gdscript
+func _snake_disabled(on_off: bool) -> void:
+ _snake.propagate_call("set_process", [on_off])
+ _snake.propagate_call("set_process_internal", [on_off])
+ _snake.propagate_call("set_physics_process", [on_off])
+ _snake.propagate_call("set_physics_process_internal", [on_off])
+ _snake.propagate_call("set_process_input", [on_off])
+```
+
+Which will stop the snake node and all children.
+
+## The food
+
+For now I just decided to setup a simple system to see everything works fine. The idea is to make some kind of generic food node/scene and a "food manager" to spawn them, for now in totally random locations. For this I added the following signals: `food_placing_new_food(type)`, `food_placed_new_food(type)` and `food_eaten(type)`.
+
+First thing is creating the `Food.tscn` which is just an *Area2D* with its necessary children with an attached script called `food.gd`. The script is really simple:
+
+```gdscript
+class_name Food # needed to access Type enum outside of the script, this registers this script as a node
+extends Area2D
+
+enum Type {
+ APPLE
+}
+
+var _type_texture: Dictionary = {
+ Type.APPLE: preload("res://entities/food/sprites/apple.png")
+}
+
+export(Type) var TYPE
+onready var _sprite: Sprite = $Sprite
+
+
+func _ready():
+ connect("body_entered", self, "_on_body_entered")
+ _sprite.texture = _type_texture[TYPE]
+
+
+func _on_body_entered(body: Node) -> void:
+ Event.emit_signal("food_eaten", TYPE)
+ queue_free()
+```
+
+Then this `food_eaten` signal is received in `snake.gd` to add a new segment to the queue.
+
+Finally, for the food manager I just created a `FoodManager.tscn` with a *Node2D* with an attached script called `food_manager.gd`. To get a random position:
+
+```gdscript
+func _get_random_pos() -> Vector2:
+ var screen_size: Vector2 = get_viewport().get_visible_rect().size
+ var temp_x: float = randf() * screen_size.x - screen_size.x / 2.0
+ var temp_y: float = randf() * screen_size.y - screen_size.y / 2.0
+
+ return Vector2(temp_x, temp_y)
+```
+
+Which gets the job done, but later I'll have to add a way to check that the position is valid. And to actually place the food:
+
+```gdscript
+func _place_new_food() -> void:
+ var food: Area2D = FOOD.instance()
+ var position: Vector2 = _get_random_pos()
+ food.global_position = position
+ add_child(food)
+```
+
+And this is used in `_process` to place new food whenever needed. For now I added a condition to add food until 10 pieces are in place, and keep adding whenever the food is is lower than 10. After setting everything up, this is the result:
+
+
## Brainstorm/To-do
--
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