public class AIscript : MonoBehaviour {
//game objects (variables which point to game objects)
public GameObject objPlayer;
private GameObject objCamera;
private VariableScript ptrScriptVariable;
//input variables (variables used to process and handle input)
private Vector3 inputRotation;
private Vector3 inputMovement;
private bool meleeAttackState;
//identity variables (variables specific to the game object)
public float moveSpeed = 100f;
public float health = 50f;
private bool thisIsPlayer;
// calculation variables (variables used for calculation)
private Vector3 tempVector;
private Vector3 tempVector2;
private int i;
private bool meleeDamageState;
// animation variables (variables used for processing aniamtion)
public float animationFrameRate = 11f; // how many frames to play per second
public float walkAnimationMin = 1; // the first frame of the walk animation
public float walkAnimationMax = 10; // the last frame of the walk animation
public float standAnimationMin = 11; // the first frame of the stand animation
public float standAnimationMax = 20; // the last frame of the stand animation
public float meleeAnimationMin = 23; // the first frame of the melee animation
public float meleeAnimationMax = 30; // the last frame of the melee animation
public float spriteSheetTotalRow = 5; // the total number of columns of the sprite sheet
public float spriteSheetTotalHigh = 4; // the total number of rows of the sprite sheet
public float frameNumber = 1; // the current frame being played,
private float animationStand = 0; // the ID of the stand animation
private float animationWalk = 1; // the ID of the walk animation
private float animationMelee = 2; // the ID of the melee animation
private float currentAnimation = 1; // the ID of the current animation being played
private float animationTime = 0f; // time to pass before playing next animation
private Vector2 spriteSheetCount; // the X, Y position of the frame
private Vector2 spriteSheetOffset; // the offset value of the X, Y coordinate for the texture
public GameObject objSpriteRender;
// Use this for initialization
void Start () {
objPlayer = (GameObject) GameObject.FindWithTag ("Player");
objCamera = (GameObject) GameObject.FindWithTag ("MainCamera");
if (gameObject.tag == "Player") { thisIsPlayer = true; }
ptrScriptVariable = (VariableScript) objPlayer.GetComponent( typeof(VariableScript) );
}
// Update is called once per frame
void Update () {
if (health <= 0)
{
removeMe();
}
FindInput();
ProcessMovement();
HandleAnimation();
if (thisIsPlayer == true)
{
HandleCamera();
}
}
// find vector to the mouse
tempVector2 = new Vector3(Screen.width * 0.5f,0,Screen.height * 0.5f); // the position of the middle of the screen
tempVector = Input.mousePosition; // find the position of the moue on screen
tempVector.z = tempVector.y; // input mouse position gives us 2D coordinates, I am moving the Y coordinate to the Z coorindate in temp Vector and setting the Y coordinate to 0, so that the Vector will read the input along the X (left and right of screen) and Z (up and down screen) axis, and not the X and Y (in and out of screen) axis
tempVector.y = 0;
inputRotation = tempVector - tempVector2; // the direction we want face/aim/shoot is from the middle of the screen to where the mouse is pointing
if ( Input.GetMouseButtonDown(0) )
{
HandleBullets();
}
}
void HandleBullets ()
{
tempVector = Quaternion.AngleAxis(8f, Vector3.up) * inputRotation;
tempVector = (transform.position + (tempVector.normalized * 0.8f));
GameObject objCreatedBullet = (GameObject) Instantiate(ptrScriptVariable.objBullet, tempVector, Quaternion.LookRotation(inputRotation) ); // create a bullet, and rotate it based on the vector inputRotation
Physics.IgnoreCollision(objCreatedBullet.collider, collider);
}
void FindAIinput ()
{
meleeAttackState = false;
if (objPlayer == null)
{
inputMovement = Vector3.zero;
inputRotation = transform.forward * -1;
return;
}
inputMovement = objPlayer.transform.position - transform.position;
inputRotation = inputMovement; // face the direction we are moving, towards the player
if ( Vector3.Distance(objPlayer.transform.position,transform.position) < 1.2f )
{
meleeAttackState = true;
inputMovement = Vector3.zero;
if (currentAnimation != animationMelee) { frameNumber = meleeAnimationMin + 1; }
}
}
void ProcessMovement()
{
tempVector = rigidbody.GetPointVelocity(transform.position) * Time.deltaTime * 1000;
rigidbody.AddForce (-tempVector.x, -tempVector.y, -tempVector.z);
rigidbody.AddForce (inputMovement.normalized * moveSpeed * Time.deltaTime);
transform.rotation = Quaternion.LookRotation(inputRotation);
transform.eulerAngles = new Vector3(0,transform.eulerAngles.y + 180,0);
transform.position = new Vector3(transform.position.x,0,transform.position.z);
}
void HandleCamera()
{
objCamera.transform.position = new Vector3(transform.position.x,15,transform.position.z);
objCamera.transform.eulerAngles = new Vector3(90,0,0);
}
void HandleAnimation () // handles all animation
{
FindAnimation();
ProcessAnimation();
}
void FindAnimation ()
{
if (meleeAttackState == true || currentAnimation == animationMelee)
{
currentAnimation = animationMelee;
return;
}
if (inputMovement.magnitude > 0)
{
currentAnimation = animationWalk;
} else {
currentAnimation = animationStand;
}
}
void ProcessAnimation ()
{
animationTime -= Time.deltaTime; // animationTime -= Time.deltaTime; subtract the number of seconds passed since the last frame, if the game is running at 30 frames per second the variable will subtract by 0.033 of a second (1/30)
if (animationTime <= 0)
{
frameNumber += 1;
// one play animations (play from start to finish)
if (currentAnimation == animationMelee)
{
frameNumber = Mathf.Clamp(frameNumber,meleeAnimationMin,meleeAnimationMax+1);
if (frameNumber > meleeAnimationMax)
{
meleeDamageState = false; // once we have finished playing our melee animation, we can detect if we have hit the player again
if (meleeAttackState == true)
{
frameNumber = meleeAnimationMin;
} else {
currentAnimation = animationWalk;
frameNumber = walkAnimationMin;
}
}
if (meleeAttackState == true ;; frameNumber > walkAnimationMin + 4 ;; meleeDamageState == false ;; objPlayer != null) // if we are within 1.2 units of the player and if we are at least 4 frames into the animation, and we haven't attacked yet
{
meleeDamageState = true;
AIscript ptrScriptAI = (AIscript) objPlayer.GetComponent( typeof(AIscript) );
ptrScriptAI.health -= 10; // damage the player
Instantiate(ptrScriptVariable.parPlayerHit, objPlayer.transform.position, Quaternion.identity );
}
}
// cyclic animations (cycle through the animation)
if (currentAnimation == animationStand)
{
frameNumber = Mathf.Clamp(frameNumber,standAnimationMin,standAnimationMax+1);
if (frameNumber > standAnimationMax)
{
frameNumber = standAnimationMin;
}
}
if (currentAnimation == animationWalk)
{
frameNumber = Mathf.Clamp(frameNumber,walkAnimationMin,walkAnimationMax+1);
if (frameNumber > walkAnimationMax)
{
frameNumber = walkAnimationMin;
}
}
animationTime += (1/animationFrameRate); // if the animationFrameRate is 11, 1/11 is one eleventh of a second, that is the time we are waiting before we play the next frame.
}
spriteSheetCount.y = 0;
for (i=(int)frameNumber; i > 5; i-=5) // find the number of frames down the animation is and set the y coordinate accordingly
{
spriteSheetCount.y += 1;
}
spriteSheetCount.x = i - 1; // find the X coordinate of the frame to play
spriteSheetOffset = new Vector2(1 - (spriteSheetCount.x/spriteSheetTotalRow),1 - (spriteSheetCount.y/spriteSheetTotalHigh)); // find the X and Y coordinate of the frame to display
objSpriteRender.renderer.material.SetTextureOffset ("_MainTex", spriteSheetOffset); // offset the texture to display the correct frame
}
void removeMe () // removes the character
{
if (thisIsPlayer == false)
{
Instantiate(ptrScriptVariable.parAlienDeath, transform.position, Quaternion.identity );
} else {
Instantiate(ptrScriptVariable.parPlayerDeath, transform.position, Quaternion.identity );
}
Destroy(gameObject);
}
}