Section 28: 2D Gaming: Continuing with Unity 2D

Transcription

1 Section 28: 2D Gaming: Continuing with Unity 2D 1. Open > Assets > Scenes > Game 2. Configuring the Layer Collision Matrix 1. Edit > Project Settings > Tags and Layers 2. Create two new layers: 1. User Layer 8 = Player 2. User Layer 9 = Hazards 3. Edit > Project Settings > Physics 2D > Layer Collision Matrix 1. Uncheck Hazards/Hazards 2. Check Player/Hazards 3. Uncheck Default(platforms)/Hazards 3. Adding the ability to Jump 4. Edit Assets > Scripts > SoyBoyController.cs 1. Add the following variables/fields: 1. public bool isjumping; 2. public float jumpspeed = 8f; 3. private float raycastlengthcheck = 0.005f; 4. private float width; 5. private float height; 2. At the bottom of Awake(), add: 1. width = GetComponent<Collider2D>().bounds.extents.x + 0.1f; 2. height = GetComponent<Collider2D>().bounds.extents.y + 0.2f; 3. Gets the dimension's of Soy Boy's sprite and adds a slight margin, so the raycast will start outside of his bounding box. 3. Add this new method: 1. public bool PlayerIsOnGround() bool groundcheck1 = Physics2D.Raycast(new Vector2(transform.position.x, transform.position.y height), -Vector2.up, raycastlengthcheck); //check centre

2 bool groundcheck2 = Physics2D.Raycast(new Vector2(transform.position.x + (width 0.2f), transform.position.y height), -Vector2.up, raycastlengthcheck); //check bottom-right bool groundcheck3 = Physics2D.Raycast(new Vector2(transform.position.x (width 0.2f), transform.position.y height), -Vector2.up, raycastlengthcheck); //check bottom-left if(groundcheck1 groundcheck2 groundcheck3) return true; else return false; 4. At the bottom of Update(), add: 1. if(playerisonground() && isjumping == false) if(input.y > 0f) isjumping = true; 5. Add these new fields: 1. public float jumpdurationthreshold = 0.25f; 2. private float jumpduration; 6. At the bottom of Update(), add: 1. if(jumpduration > jumpdurationthreshold) input.y = 0f; 2. If the jump button is held for longer than ¼ of a second then the jump stops.

3 7. At the bottom of FixedUpdate(), add: 1. if(isjumping && jumpduration < jumpdurationthreshold) rb.velocity = new Vector2(rb.velocity.x, jumpspeed); 2. Gives Soy Boy's rigidbody new velocity 8. In Update(), just above the PlayerIsOnGround() check, add: 1. if(input.y >= 1f) jumpduration += Time.deltaTime; else isjumping = false; jumpduration = 0f; 9. Save, return to Unity and test it out. 5. Improving the Jump While in the Air 1. In FixedUpdate(), change if(input.x == 0) to: 1. if(playerisonground() && input.x == 0) 2. Add a new variable: 1. public float airaccel = 3f; 3. In FixedUpdate(), at the top, replace the line var acceleration = accel, with: 1. var acceleration = 0f; if(playerisonground()) acceleration = accel; else acceleration = airaccel; 2. Acceleration is 0, then set to various intensities depending on in air or not. 6. Adding Wall Jumps 1. Edit SoyBoyController.cs 2. Add the following method: 1. public bool IsWallToLeftOrRight()

4 bool wallonleft = Physics2D.Raycast(new Vector2(transform.position.x width, transform.position.y), -Vector2.right, raycastlengthcheck); bool wallonright = Physics2D.Raycast(new Vector2(transform.position.x + width, transform.position.y), Vector2.right, raycastlengthcheck); if(wallonleft wallonright) return true; else return false; 3. Add the following variable: 1. public float jump = 14f; 4. Add the following method: 1. public bool PlayerIsTouchingGroundOrWall() if(playerisonground() IsWallToLeftOrRight()) return true; else return false; 5. In FixedUpdate(), just above rb.addforce(...), add: 1. var yvelocity = 0f; if(playeristouchinggroundorwall() && input.y == 1)

5 yvelocity = jump; else yvelocity = rb.velocity.y; 6. In FixedUpdate(), change rb.velocity = new Vector2(... to: 1. rb.velocity = new Vector2(xVelocity, yvelocity); 2. Our character can now jump when he is on the ground OR by a wall, but he jumps straight up. TEST IT OUT! 7. Add one more method: 1. public int GetWallDirection() bool iswallleft = Physics2D.Raycast(new Vector2(transform.position.x width, transform.position.y), -Vector2.right, raycastlengthcheck); bool iswallright = Physics2D.Raycast(new Vector2(transform.position.x + width, transform.position.y), Vector2.right, raycastlengthcheck); if(iswallleft) return -1; else if(iswallright) return 1; else return 0; 8. In FixdedUpdate(), after rb.velocity = new Vector2(xVelocity, yvelocity);, add: 1. if(iswalltoleftorright() &&!PlayerIsOnGround() && input.y

6 == 1) rb.velocity = new Vector2(-GetWallDirection() * speed * 0.75f, rb.velocity.y); 9. Save 10.Return to Unity place some walls 1. Ctrl-D to duplicate items in Game View 2. Hold Ctrl while moving to snap (make sure you are using Translate tool) 7. Character Animations 1. Hierarchy > SoyBoy > open Animator Window > Parameters tab 2. Click the + sign 3 times to add 3 parameters 1. Speed Float IsJumping Bool unchecked 3. IsOnWall Bool unchecked 3. Right-click Entry state > Make Transition > select IdleAnimation 4. Right-click IdleAnimation > Set as Layer Default State 5. IdleAnimation > Make Transition > RunAnimation 6. RunAnimation > Make Transition > IdleAnimation 7. Click the transition arrow from IdleAnimation to RunAnimation 1. Conditions > + > Condition = Speed > 0 2. Uncheck Has Exit Time 8. Click the transition arrow from RunAnimation to IdleAnimation 1. Conditions > + > Condition = Speed < Uncheck Has Exit Time 9. Make sure every other state has transitions going TO and FROM each to each. Idle Jump IsJumping = TRUE Speed < 0.5 Jump Idle Speed < 0.05 IsJumping = FALSE Run Jump IsJumping = TRUE Jump Run IsJumping = FALSE Speed > 0 Run Slide IsOnWall = TRUE Slide Run IsOnWall = FALSE Speed > 0 Slide Jump IsJumping = TRUE IsOnWall = FALSE IsOnWall = FALSE 10. Make sure Has Exit Time is unchecked for ALL transitions Jump Slide IsOnWall = TRUE IsJumping = FALSE Slide Idle IsOnWall = FALSE Speed < 0.05

7 11. There is NO transition FROM Idle TO Slide 12. RunAnimation > animation speed = Edit SoyBoyController.cs 1. In Update(), just below Input.GetAxis() calls: 1. animator.setfloat( Speed, Mathf.Abs(input.x)); 2. Still in Update(), change the entire if/else if(input.y >= 1f)..., to: 1. if(input.y >= 1f) jumpduration += Time.deltaTime; animator.setbool( IsJumping, true); else isjumping = false; animator.setbool( IsJumping, false); jumpduration = 0f; 3. Still in Update(), after if(input.y >0f) isjumping = true;, add: 1. animator.setbool( IsOnWall, false); 4. In the FixedUpdate() method, replace the block if (IsWallToLeftOrRight() &&! PlayerIsOnGround() && input.y == 1), with: 1. if (IsWallToLeftOrRight() &&!PlayerIsOnGround() && input.y == 1) rb.velocity = new Vector2(-GetWallDirection() * speed * 0.75f, rb.velocity.y); animator.setbool( IsOnWall, false); animator.setbool( IsJumping, true); else if (!IsWallToLeftOrRight()) animator.setbool( IsOnWall, false); animator.setbool( IsJumping, true); if (IsWallToLeftOrRight() &&!PlayerIsOnGround()) animator.setbool( IsOnWall, true);

8 5. Save, return to Unity and test it out! 8. Adding Hazards 1. Create a script named Hazard 2. Hierarchy > buzzsaw > Add Component > 1. Scripts > Hazard 2. Audio > Audio Source 3. Edit the script Hazard 1. Add the following variables / fields: 1. public GameObject playerdeathprefab; 2. public AudioClip deathclip; 3. public Sprite hitsprite; 4. private SpriteRenderer spriterenderer; 2. Add the following method: 1. void Awake() spriterenderer = GetComponent<SpriteRenderer>(); 3. Add the following method: 1. void OnCollisionEnter2D(Collision2D coll) if(coll.tranform.tag == Player ) var audiosource = GetComponent<AudioSource>(); if(audiosource!= null && deathclip!= null) audiosource.playoneshot(deathclip); Instantiate(playerDeathPrefab, coll.contacts[0].point, Quaternion.identity); spriterenderer.sprite = hitsprite; Destroy(coll.gameObject);

9 4. Save the script and return to Unity. 4. Hierarchy > buzzsaw > Inspector 1. Hit Sprite = Assets > Sprites > buzzsaw-hit 2. Death Clip = Assets > Sound > ssb_death 5. Hierarchy > Create > Create Empty 1. Name = DeathParticleSystem 2. X-Rotation = Add Component > Effects > Particle System 1. Duration = Looping = Unchecked 3. Start Lifetime = 2 4. Start Speed = Random between two constants 10 and Start Size = Start Rotation = Random between two constants 0 and Gravity Modifier = 3 8. Enable Emission 1. Rate over Time = Enable Shape 1. Shape = cone 2. Angle = Radius = Enable Color over Lifetime % alpha 0% alpha 11. Expand Renderer 1. Material = Sprites-Default 2. Sorting Layer = Foreground 3. Order in Layer = Scene View > Hierarchy > DeathParticleSystem > Simulate (bottom-right) 7. Drag and drop DeathParticleSystem into Assets > Prefabs 8. Delete Hierarchy > DeathParticleSystem 9. Hierarchy > buzzsaw > Inspector >

10 1. Player Death Prefab = Assets > Prefabs > DeathParticleSystem 2. Click Apply 10. Create a new script named RotationScript 1. Add the following variable: 1. public float rotationsperminute = 640f; 2. In Update(), add: 1. transform.rotate(0, 0, rotationsperminute * Time.deltaTime, Space.Self); 3. Save and return to Unity 11. Hierarchy > buzzsaw > Inspector 1. Add Component >Scripts > RotationScript 2. Click Apply 12. Hierarchy > SoyBoy > Inspector 1. Tag = Player 2. Click Apply 13.Test it out. 9. Sound 1. Hierarchy > Create > Create Empty 1. Name = Music 2. Add Component > Audio > Audio Source 1. AudioClip = Assets > Sound > supersoyboy.ogg 2. Edit the script SoyBoyController.cs 1. Add the following fields: 1. public AudioClip runclip; 2. public AudioClip jumpclip; 3. public AudioClip slideclip; 4. private AudioSource audiosource; 2. In the Awake() method, add: 1. audiosource = GetComponent<AudioSource>(); 3. Create the following method: 1. void PlayAudioClip(AudioClip clip) if(audiosource!= null && clip!= null)

11 if(!audiosource.isplaying) audiosource.playoneshot(clip); 4. In the Update() method, change the IF that checks on ground && not jumping: 1. if(playerisonground() &&!isjumping) if(input.y > 0f) isjumping = true; PlayAudioClip(jumpClip); animator.setbool( IsOnWall, false); if(input.x < 0f input.x > 0f) PlayAudioClip(runClip); 5. Edit FixedUpdate(), near the bottom, the IF statements that set boolean parameters (new lines are marked): 1. if(iswalltoleftorright() &&!PlayerIsOnGround() && input.y == 1) rb.velocity = new Vector2(-GetWallDirection() * speed * 0.75f, rb.velocity.y); animator.setbool( IsOnWall, false); animator.setbool( IsJumping, true); //NEW LINE: PlayAudioClip(jumpClip); else if (!IsWallToLeftOrRight())

12 animator.setbool( IsOnWall, false); animator.setbool( IsOnWall, true); if(iswalltoleftorright() &&!PlayerIsOnGround()) animator.setbool( IsOnWall, true); //NEW LINE: PlayAudioClip(slideClip); 6. Save and return to Unity 3. Hierarchy > SoyBoy > Inspector > 1. Run Clip = Assets > Sound > ssb_run_short.ogg 2. Jump Clip = Assets > Sound > ssb_jump.ogg 3. Slide Clip = Assets > Sound > ssb_slide_loop 4. Add Component > Audio > Audio Source 5. Click Apply 4. Run the game, test it out. 10. Creating a Game Manager 1. Create a new script called GameManager 2. Create a new GameObject called GameManager 3. Hierarchy > GameManager > Add Component > Script > GameManager.cs 4. Edit the script, GameManager.cs: 1. Add the field: 1. public static GameManager instance; 2. Create the following method: 1. void Awake() if(instance == null) instance = this; else if (instance!= this) Destroy(gameObject);

13 DontDestroyOnLoad(gameObject); 3. Add the following using statement: 1. using UnityEngine.SceneManagement; 4. Create the following methods: 1. public void RestartLevel(float delay) StartCoroutine(RestartLevelDelay(delay)); 2. private IEnumerator RestartLevelDelay(float delay) yield return new WaitForSeconds(delay); SceneManager.LoadScene( Game ); 5. Save. 5. Edit the script, Hazard.cs 1. In OnCollisionEnter2D(), at the bottom, right after Destroy(), add: 1. GameManager.instance.RestartLevel(1.25f); 6. Create a new script, named Goal 1. Add the following: 1. public AudioClip goalclip; 2. void OnCollisionEnter2D(Collision2D coll) if(coll.gameobject.tag == Player ) var audiosource = GetComponent<AudioSource>(); if(audiosource!= null && goalclip!= null) audiosource.playoneshot(goalclip); GameManager.instance.RestartLevel(0.5f);

14 2. Save and return to Unity 3. Assets > Resources > Prefabs > goal > Add Component > Scripts > Goal.cs 1. Goal Clip = ssb_goal.ogg 4. Place an instance of Goal in the level. 5. Run the game to test it out 11. Adding a Timer 1. Create a new script named Timer 1. Add the following using statement 1. using UnityEngine.UI; 2. Remove the Start() and Update() methods. 3. Add: 1. private Text timertext; 2. void Awake() timertext = GetComponent<Text>(); 3. void Update() timertext.text = System.Math.Round((decimal) Time.timeSinceLevelLoad, 2).ToString(); 4. Save and return to Unity 5. Hierarchy > Canvas > Timer > Add Component > Scripts > Timer.cs 12. Building Your Own Level 1. Drag and drop instances of prefabs onto the Scene view. 2. Remember hold down Ctrl while moving objects to snap-to.