[unity3d] human computer interaction input

1 Preface

        Input yes Unity3D Tools for human-computer interaction in , Users can call their GetKey、GetMousePosition、GetMouseButton、GetAxis、GetButton And other methods to obtain the status information of the keyboard and mouse , Then control the game object through these state information , So as to realize human-computer interaction .

        1） Keyboard entry

//  Press and hold the key 
public static bool GetKey(KeyCode key)
//  Press the button 
public static bool GetKeyDown(KeyCode key)
//  Lift the button 
public static bool GetKeyUp(KeyCode key)

        KeyCode The value is ：

A~Z
F1~F15
//  Number at the top of the keyboard 
Alpha0~Alpha9
Left、RightArrow、UpArrow、DownArrow
LeftCtrl、LeftShift、LeftAlt、LeftWindows、RightCtrl、RightShift、RightAlt、RightWindows
Tab、Space、Backspace、Return
//  plus 、 minus sign 、 asterisk 、 Slash 、 The backslash 、 Left parenthesis 、 Right bracket 、 Less than no. 、 More than no. 、 be equal to 、 Upper tip 
Plus、Minus、Asterisk、Slash、Backslash、LeftBracket、RightBracket、Less、Greater、Equals、Caret
//  comma 、 Order number 、 question mark 、 A semicolon 、 The colon 、 Single quotation marks 、 The quotation marks 、 Double quotes 、 Exclamatory mark 
Comma、Period、Question、Semicolon、Colon、Quote、BackQuote、DoubleQuote、Exclaim
// @ Symbol 、$ Symbol 、& Symbol 、 Underline 
At、Dollar、Ampersand、Underscore
Insert、Delete、Home、End、PageUp、PageDown、Print
CapsLock、Numlock、ScrollLock
Keypad0~Keypad9、KeypadPeriod
KeypadPlus、KeypadMinus、KeypadMultiply、KeypadDivide
KeypadEquals、KeypadEnter
//  Left mouse button 、 Right mouse button 、 Middle of mouse 
Mouse0、Mouse1、Mouse2

        2） Mouse input

//  Hold down the mouse 
public static bool GetMouseButton(int button)
//  Press mouse 
public static bool GetMouseButtonDown(int button)
//  Raise the mouse 
public static bool GetMouseButtonUp(int button)
//  Mouse coordinates 
Vector3 position = Input.mousePosition

        explain ：button The value is 0、1、2, Respectively represents the left mouse button 、 Right click 、 In the key . 

        3） Virtual axis input

        stay 【Edit→Project Settings→Input】 Can be opened in InputManager Configuration interface , You can configure the virtual axis information here .

      

//  Press the left and right arrows or A、D key ,hor stay -1~1 Change between 
float hor = Input.GetAxis("Horizontal");
//  Press the up and down arrows or W、S key ,hor stay -1~1 Change between 
float ver = Input.GetAxis("Vertical");
//  Get the movement of the mouse in the horizontal direction 
float mouseX = Input.GetAxis("Mouse X");
//  Get the movement of the mouse in the vertical direction 
float mouseY = Input.GetAxis("Mouse Y");

        4） Virtual key input

         InputManager Configure virtual keys in the configuration interface , as follows ：

//  Press and hold the virtual key 
public static bool GetButton(string buttonName)
//  Press the virtual key 
public static bool GetButtonDown(string buttonName)
//  Lift the virtual key 
public static bool GetButtonUp(string buttonName)
//  According to the above configuration , Hold down Q Key or left mouse button to return true, It means firing 
bool fire = Input.GetButton("Fire");

2 application

        This section will realize the tank battle game .

        1） Implementation requirements

• draw 2 A tank , One represents one's own side , One represents the enemy ;
• The user can control the forward and backward movement of his own tank through the up and down arrow keys , Use the left and right arrow keys to control the left and right movement or left and right steering of your tanks ;
• The user can fire shells through the left mouse button ;
• Enemy tanks can automatically turn and aim at their own tanks , But there is a delay , Turn fast and then slow , The delay interpolation coefficient is 0.6;
• Enemy tanks aim at their own tanks （ Allow 5° error ）, Automatic firing , The firing interval needs to be greater than 1 second .

        2） Create game objects

        The object of the game Transform The component parameters are as follows ： 

name	type	position	Rotation	scale	Color/Texture
MyTank	Empty	(0, 0.25, -5)	(0, 0, 0)	(1, 1, 1)	——
Button	Cube	(0, 0, 0)	(0, 0, 0)	(2, 0.5, 2)	#228439FF
Top	Cube	(0, 0.5, 0)	(0, 0, 0)	(1, 0.5, 1)	#228439FF
Gun	Cylinder	(0, 0, 1.5)	(90, 0, 0)	(0.2, 1, 0.4)	#228439FF
FirePoint	Empty	(0, 1.15, 0)	(0, 0, 0)	(1, 1, 1)	——
MyBullet	Sphere	(0, 0, -2)	(0, 0, 0)	(0.2, 0.2, 0.2)	#82EA4FFF
Plane	Plane	(0, 0, 0)	(0, 0, 0)	(10, 10, 10)	GrassRockyAlbedo
EnemyTank	Empty	(0, 0.25, 5)	(0, 180, 0)	(1, 1, 1)	15D3F9FF
EnemyBullet	Sphere	(0, 0, 2)	(0, 0, 0)	(0.2, 0.2, 0.2)	#4C55F8FF

        explain ： EnemyTank from  MyTank Copy it , Just changed the color properties of itself and its children ;EnemyBullet from  MyBullet Copy it , Then the color attribute is modified ; take  MyBullet and EnemyBullet Drag to Assets Window Resources/Prefabs Under the table of contents , Generate preset （prefab）, And then delete Hierarchy Under the window  MyBullet and EnemyBullet object .

          The hierarchy of the game object is as follows ：

        The game interface is as follows ：

         3） Script components

        MyTank.cs

using UnityEngine;

public class MyTank : MonoBehaviour {
	private Transform firePoint; //  Firing point 
	private GameObject bulletPrefab; //  Shell preset 

	void Start() {
		firePoint = transform.Find("Top/Gun/FirePoint");
		bulletPrefab = (GameObject) Resources.Load("Prefabs/MyBullet");
		Debug.Log(bulletPrefab);
	}

	void Update () {
		float hor = Input.GetAxis("Horizontal");
        float ver = Input.GetAxis("Vertical");
		move(hor, ver);
		if (Input.GetMouseButtonDown(0)) { //  fire 
			GameObject bullet = Instantiate(bulletPrefab, firePoint.position, Quaternion.identity); //  Create shells from presets 
			bullet.GetComponent<Bullet>().setMoveDir(transform.forward); //  Set the direction of the shell 
		}
	}

	private void move(float hor, float ver) {
		//  Mobile scheme 1 ： The up and down arrows control the forward and backward movement , The left and right arrows control the left and right movement 
		// transform.Translate(hor * Time.deltaTime * 3, 0, ver * Time.deltaTime * 3);

		//  Mobile scheme II ： The up and down arrows control the forward and backward movement , The left and right arrows control the left and right turns 
		transform.Translate(0, 0, ver * Time.deltaTime * 3);
		transform.Rotate(Vector3.up * hor * Time.deltaTime * 120f);
	}
}

          explain ：MyTank.cs The script component is attached to MyTank On the object of the game .

        EnemyTank.cs

using UnityEngine;

public class EnemyTank : MonoBehaviour {
	private Transform target; //  The goal is 
	private Transform top; //  Gun head 
	private Transform firePoint; //  Firing point 
	private GameObject bulletPrefab; //  Shell preset 
	private float fireInternal = 0; //  Firing interval 

	void Start () {
		target = GameObject.Find("MyTank/Top").transform;
		top = transform.Find("Top");
		firePoint = transform.Find("Top/Gun/FirePoint");
		bulletPrefab = (GameObject) Resources.Load("Prefabs/EnemyBullet");
	}

	void Update () {
		Quaternion dir = Quaternion.LookRotation(target.position - top.position);
		top.rotation = Quaternion.Lerp(top.rotation, dir, Time.deltaTime * 0.6f); //  The enemy turned to his own side 
		float angle = Vector3.Angle(target.position - top.position, top.forward);
		if (angle < 5 && fireInternal > 1) {
			GameObject bullet = Instantiate(bulletPrefab, firePoint.position, Quaternion.identity); //  Create shells from presets 
			bullet.GetComponent<Bullet>().setMoveDir(top.forward); //  Set the direction of the shell 
			fireInternal = 0;
		}
		fireInternal += Time.deltaTime;
	}
}

          explain ：EnemyTank.cs The script component is attached to EnemyTank On the object of the game .

        Bullet.cs

using UnityEngine;

public class Bullet : MonoBehaviour {
	private Vector3 moveDir; //  The direction in which the shell flew 

	void Start () {
		Destroy(gameObject, 2); // 2 Automatically destroy in seconds 
	}

	void Update () {
		if (moveDir != null) {
			transform.Translate(moveDir * Time.deltaTime * 6);
		}
	}

	public void setMoveDir(Vector3 dir) {
		moveDir = dir;
	}
}

          explain ：Bullet.cs The script component is attached to MyBullet and EnemyBullet On the preset body .

          4） Running effect

         The left and right arrow keys control the left and right movement of your tanks  

         The left and right arrow keys control the left and right steering of your tank