added remove gem

_subsections/sec03/lesson-07.org

@@ -1,21 +1,24 @@
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../../../../../_share/media/css/org-mode.css" />
 #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../../../_share/media/css/godot.css" />
-#+title: Section 03 - Lesson 07 | Moving the Gem
+#+title: Section 03 - Lesson 07, 09 | Moving/ Removing the Gem
 
 * Links
 - [[../../toc.org][TOC - Godot Notes]]
-- [[https://www.udemy.com/course/jumpstart-to-2d-game-development-godot-4-for-beginners/learn/lecture/45070467#announcements][S03:L14.07 - Moving the Gem]]
+- [[https://www.udemy.com/course/jumpstart-to-2d-game-development-godot-4-for-beginners/learn/lecture/45070467#announcements][S03:L15.07 - Moving the Gem]]
+- [[https://www.udemy.com/course/jumpstart-to-2d-game-development-godot-4-for-beginners/learn/lecture/45070471#announcements][S03:L15.09 - Removing the Gem]]
 
 * Notes
 
+** Moving the Gem
+
 we use scripting to extend node functionality
 
-** get the gem to fall
+*** get the gem to fall
 - we need to get the Gem/Area2D node to fall
   - if we had the sprite fall, the collision2D node would stay where it was
 
 
-*** add a script to the root node
+**** add a script to the root node
   - click on the attach new script button in the scene pane
     -
         #+ATTR_HTML: :width 200px
@@ -23,7 +26,7 @@ we use scripting to extend node functionality
   - one script per node is the limit
   - you get access to all the children nodes inside the scene.
 
-*** attach node script dialogue
+**** attach node script dialogue
 - Template is generally Node: Default
 - some object types provide other templates with different boiler plate code
 
@@ -32,7 +35,7 @@ we use scripting to extend node functionality
         #+ATTR_HTML: :width 200px
        [[file:../../../_share/media/img/albert/script_icon.png]]
 
-*** detaching script from node
+**** detaching script from node
 - sometimes you don't want a certain script attached to a node
   - for testing purposes to prevent a script from doing something
   - you want a different script, etc.
@@ -40,12 +43,12 @@ we use scripting to extend node functionality
 - if a script is attached, then when you select the node the "script attach button" will change from a green plus to a red x
 - press the button and detach it
 
-** life cycle of a node
-*** functions
+*** life cycle of a node
+**** functions
 - _ready()
 - _process(delta:float)
 
-*** tree build by stages
+**** tree build by stages
 1. initialization stage
    - creation
    - function: _init_()
@@ -58,7 +61,7 @@ we use scripting to extend node functionality
    - node and children ready
    - function: _read()
 
-*** how it is built
+**** how it is built
 - every node is given an id before it gets a name
 
 - all init functions will be called before any other stage for any other node is invoked
@@ -70,7 +73,7 @@ we use scripting to extend node functionality
   - therefore the children of the node will be set up before the parent
   - ready will be called for the children first
 
-*** process functions
+**** process functions
 - invoked on all nodes
 - every frame
 
@@ -87,9 +90,21 @@ we use scripting to extend node functionality
 - called in main loop
 - regular interval
 
-** adding code to move gem down
+*** adding code to move gem down
 - increase the y position
 - all node parameters can be found in inspector (including inherited)
 - position.y = position.y + speed * delta
   - speed can be anything
   - we multiply by delta to normalize it compared to the time of the previous frame
+
+** Removing the Gem
+*** basic idea
+- use the viewport rect
+- find the height of the rect
+- when the y position of the gem is outside the bounds remove it
+
+*** implementation
+- use get_viewport_rect to get the w,h
+- check if position.y > rect.size.y
+- use queue_free function to remove this from the queue
+- set process to stop being called via set_process