Slides from introd

1. Petri Lankoski

2. Contents
 Waypoint track
 Enemy following waypoint track
 PlayerLogic keeping track of Power and
Health stats
 Displaying health & power meter with GUI
 Scaling GUI to different screen sizes
 PowerUp

3. Waypoint
public class Waypoint : MonoBehaviour {
public Transform nextTarget;
public string agentTag; // Tag of the things we set the new target
void OnTriggerEnter(Collider other) {
if(other.gameObject.CompareTag(agentTag)) {
SendNextTarget(other.gameObject);
}
}
void OnDrawGizmos() {
Gizmos.DrawIcon (transform.position, "waypoint.psd");
if(nextTarget) {
Gizmos.color = Color.red;
Gizmos.DrawLine(transform.position, nextTarget.position);
}
}
private void SendNextTarget(GameObject obj) {
Enemy script = obj.GetComponent<Enemy>();
script.SetTarget(nextTarget);
}
}

4. Waypoint.psd
Waypoint (etc, other formats
Works)
 Setup
 Waypoint prefab
○ With Waypoint script attached
○ With collider in trigger mode (is trigger set)
 Gizmos/waypoint.psd
○ Size should be 32x32 or 25x25 pixels
 Create a track using waypoints
 TEST

5. Waypoint setup, one track

6. Waypoint setup, two tracks

7. Enemy Following Waypoints
 Enemy c# class
 Enemy target in public Transform
○ So we can set the first target waypoint on the inspector
 Implement
○ public void SetTarget(Transform newTarget) { /* Store newTarget
to private variable of Enemy class here*/ }
 Make enemy move by the track set with Waypoints
○ Use Update() for this
○ transform.LookAt()
○ transform.Translate(), Time.deltaTime
 Create Enemy prefeb
 Create new tag and set tag to Enemy (or something depending
the value of agentTag)
 Set the tag to Enemy (or to match the AgentTag variable) to the
waypoints on your track
 TEST

8. Second Enemy
 Make an enemy follow different track
 Create new tag and set tag to Enemy
 Set the tag (to the AgentTag variable) to the
waypoints on your track

9. Player Object
 Add FirstPersonController to public class GUIGlobals {
scene public const float screenWidth = 1280.0f;
 Standard Assets/Character public const float screenHeight = 800.0f;
Controllers
public static Matrix4x4 GetGUIMatrix() {
 Create PlayerLogic.cs
 Add meters for health and
float xScale=Screen.widt /screenWidth;
power float yScale=Screen.height/screenHeight;
 OnGUI(): return Matrix4x4.TRS(
○ GUI.matrix = GUIGlobals
.GetGUIMatrix(); Vector3.zero,
○ Use GUI.DrawTexture() & Quaternion.identity,
changing the height or width of
the texture
new Vector3(xScale, yScale, 1)
○ Drawing are for DrawTexture: );
 new Rect(x, y, width, height) }
 power & health as public
variable for testing
}

10. GUI.matrix & GUIGlobals
0,0 GUIGlobals.screenWidth,0
 Scales the GUI for
you in any screen
sizes
 Layout according to
values set in
GUIGlobals
new Rect(GUIGlobals.screenWidth-40,
GUIGlobals.screenHeight-40,
20,20)
GUIGlobals.screenWidth,
GUIGlobals.screenHeight
0,GUIGlobals.screenHeight

11. Shortcut to Player, Singleton
public class GameAgents : MonoBehaviour {
private static GameAgents instance;
private GameObject player;
private PlayerLogic playerLogic;
void Awake() {
instance = this;
player = GameObject.FindWithTag("Player");
playerLogic = player.GetComponent<PlayerLogic>();
}
public static GameObject GetPlayer() { return instance.player;}
public static PlayerLogic GetPlayerLogic() {
return instance.playerLogic;
}
}

12. GameAgents
 Add to an empty game object
 Allows easy access to Player object and
PlayerLogic classes from other classes
 GameObject pc = GameAgents.GetPlayer();
 PlayerLogic pl =
GameAgents.GetPlayerLogic();
 GameAgents.GetPlayerLogic().enabled =
false;
 GameAgents.GetPlayerLogic().FunctionNam
e(4,6);

13. PowerUp
 Expose health and power on inspector
 public int health, power;
 Collider in trigger mode ()
 Catch collision OnTriggerEnter(Collider other)
 Check if player object collided with it
○ if(other.gameObject == GameAgents.GetPlayer()) …
 This is faster than tag comparison used in Waypoint
 Send Health and Power to PlayerLogic script
○ GameAgents.GetPlayerLogic().PowerUp(health,power)
○ You need to add a function for that to PlayerLogic
 public void PowerUp(int powerAdd, int healtAhh) {