UNITY | PROJECT | SPACE SHOOTER 2D | 6. Explosion Animation

For the Sprite of Explosion in the Inspector
- Set the Sprite Mode into “Multiple”
- Set the Filter Mode into “Point(no filter)”
- Set the Max Sie into “1024”

“Explosion” Animation works well except that the last frame of the animation lasts in the scene

UNITY | PROJECT | SPACE SHOOTER 2D | 5. Enemy Bullet & Enemy Shooting

Create Variables for “speed”, “direction”, “flag”
Create a Function to set the Bullet’s Direction, “SetTheDirection(Vector2 direction)”
- Be careful not to be confused with the names of variable “direction”
  - to differentiate them, put “this.” in front of “direction”(not the argument)
- normalize the vector to get purely a direction (to make the computing correct and simple)
- set the flag(the boolean variable) as “True” to activate the codes in “Update()” method
In “Update()” method
- the codes will be activated when the flag is set to “True”
- the position of the bullet is updated every frame by calculating “transform.position” with “direction(Vector2, the result from “SetDirection()”)’
- if a bullet goes out of the screen, Destroy it
In “Awake()”
- every code in “Awake()” is activated before the game starts
- before the game starts, set “speed” and “ready” with default values

Add a public GameObject variable to use EnemyBullet prefab as a component
Create a Function to fire bullets from Enemy, “FireEnemyBullet()”
- get a reference of “Player” by using “GameObject.Find()”
- the way of detecting a GameObject, “if(gameObject != null)”
- if “Player” is detected, a bullet is instantiated and its initial position is set
- how to calculate an aiming direction: Vector – Vector
- to use “SetDirection()” method of “EnemyBullet” Class, use “GetComponent()” towards “bullet”
In “Start()” method
- make “FireEnemyBullet()” activated after 1 second, by using “Invoke()”

To apply changes on the prefab, Don’t forget to push “Apply” button in the Inspector

by using “Sprite Editor”, slice “Bullets” sprites into 2 sprites
- when slicing, set the type into “Grid By Cell Size”
- when slicing, set the Pixel Size as 24×24

for the bullet sprite in the inspector
- deselect “Generate Physics Shape”
- Filter Mode into “Point(no filter)”
- Max Size into “1024”

set the public variable “speed” for the speed of the bullet
In “Update()” method
- get the bullet’s current position by using “transform.position”
- computing the bullet’s new position = the change of position when we shoot the bullet
  - only need to change the “y” value
- to smooth the shooting, use “Time.deltaTime”
- Don’t forget to update the position into “transform.position”
for the memory usage, destroy the bullets going outside the screen
- when setting the screen range, only consider “y” value or “height”
- “Camera.main.ViewPortToWorlPoint()”