यूनिटी में स्नेक गेम कैसे बनाएं

इस पोस्ट में, मैं दिखाऊंगा कि Unity में क्लासिक स्नेक गेम कैसे बनाया जाए।

Sharp Coder वीडियो प्लेयर

Unity इस ट्यूटोरियल में उपयोग किया गया संस्करण: Unity 2018.3.0f2 (64-बिट)

चरण 1: स्क्रिप्ट बनाएं

"One Script Game" होने के कारण इस ट्यूटोरियल के लिए केवल 1 स्क्रिप्ट की आवश्यकता है:

SC_SnakeGameGenerator.cs

//You are free to use this script in Free or Commercial projects
//sharpcoderblog.com @2019

using System.Collections.Generic;
using UnityEngine;

public class SC_SnakeGameGenerator : MonoBehaviour
{
    //Game area resolution, the higher number means more blocks
    public int areaResolution = 22;
    //Snake movement speed
    public float snakeSpeed = 10f;
    //Main Camera
    public Camera mainCamera;
    //Materials
    public Material groundMaterial;
    public Material snakeMaterial;
    public Material headMaterial;
    public Material fruitMaterial;

    //Grid system
    Renderer[] gameBlocks;
    //Snake coordenates
    List<int> snakeCoordinates = new List<int>();
    enum Direction { Up, Down, Left, Right };
    Direction snakeDirection = Direction.Right;
    float timeTmp = 0;
    //Block where the fruit is placed
    int fruitBlockIndex = -1;
    //Total accumulated points
    int totalPoints = 0;
    //Game status
    bool gameStarted = false;
    bool gameOver = false;
    //Camera scaling
    Bounds targetBounds;
    //Text styling
    GUIStyle mainStyle = new GUIStyle();

    // Start is called before the first frame update
    void Start()
    {
        //Generate play area
        gameBlocks = new Renderer[areaResolution * areaResolution];
        for (int x = 0; x < areaResolution; x++)
        {
            for (int y = 0; y < areaResolution; y++)
            {
                GameObject quadPrimitive = GameObject.CreatePrimitive(PrimitiveType.Quad);
                quadPrimitive.transform.position = new Vector3(x, 0, y);
                Destroy(quadPrimitive.GetComponent<Collider>());
                quadPrimitive.transform.localEulerAngles = new Vector3(90, 0, 0);
                quadPrimitive.transform.SetParent(transform);
                gameBlocks[(x * areaResolution) + y] = quadPrimitive.GetComponent<Renderer>();
                targetBounds.Encapsulate(gameBlocks[(x * areaResolution) + y].bounds);
            }
        }

        //Scale the MainCamera to fit the game blocks
        mainCamera.transform.eulerAngles = new Vector3(90, 0, 0);
        mainCamera.orthographic = true;
        float screenRatio = (float)Screen.width / (float)Screen.height;
        float targetRatio = targetBounds.size.x / targetBounds.size.y;

        if (screenRatio >= targetRatio)
        {
            mainCamera.orthographicSize = targetBounds.size.y / 2;
        }
        else
        {
            float differenceInSize = targetRatio / screenRatio;
            mainCamera.orthographicSize = targetBounds.size.y / 2 * differenceInSize;
        }
        mainCamera.transform.position = new Vector3(targetBounds.center.x, targetBounds.center.y + 1, targetBounds.center.z);

        //Generate the Snake with 3 blocks
        InitializeSnake();
        ApplyMaterials();

        mainStyle.fontSize = 24;
        mainStyle.alignment = TextAnchor.MiddleCenter;
        mainStyle.normal.textColor = Color.white;
    }

    void InitializeSnake()
    {
        snakeCoordinates.Clear();
        int firstlock = Random.Range(0, areaResolution - 1) + (areaResolution * 3);
        snakeCoordinates.Add(firstlock);
        snakeCoordinates.Add(firstlock - areaResolution);
        snakeCoordinates.Add(firstlock - (areaResolution * 2));

        gameBlocks[snakeCoordinates[0]].transform.localEulerAngles = new Vector3(90, 90, 0);
        fruitBlockIndex = -1;
        timeTmp = 1;
        snakeDirection = Direction.Right;
        totalPoints = 0;
    }

    // Update is called once per frame
    void Update()
    {
        if (!gameStarted)
        {
            if (Input.anyKeyDown)
            {
                gameStarted = true;
            }
            return;
        }
        if (gameOver)
        {
            //Flicker the snake blocks
            if (timeTmp < 0.44f)
            {
                timeTmp += Time.deltaTime;
            }
            else
            {
                timeTmp = 0;
                for (int i = 0; i < snakeCoordinates.Count; i++)
                {
                    if (gameBlocks[snakeCoordinates[i]].sharedMaterial == groundMaterial)
                    {
                        gameBlocks[snakeCoordinates[i]].sharedMaterial = (i == 0 ? headMaterial : snakeMaterial);
                    }
                    else
                    {
                        gameBlocks[snakeCoordinates[i]].sharedMaterial = groundMaterial;
                    }
                }
            }

            if (Input.GetKeyDown(KeyCode.Space))
            {
                InitializeSnake();
                ApplyMaterials();
                gameOver = false;
                gameStarted = false;
            }
        }
        else
        {
            if (timeTmp < 1)
            {
                timeTmp += Time.deltaTime * snakeSpeed;
            }
            else
            {
                timeTmp = 0;
                if (snakeDirection == Direction.Right || snakeDirection == Direction.Left)
                {
                    //Detect if the Snake hit the sides
                    if (snakeDirection == Direction.Left && snakeCoordinates[0] < areaResolution)
                    {
                        gameOver = true;
                        return;
                    }
                    else if (snakeDirection == Direction.Right && snakeCoordinates[0] >= (gameBlocks.Length - areaResolution))
                    {
                        gameOver = true;
                        return;
                    }

                    int newCoordinate = snakeCoordinates[0] + (snakeDirection == Direction.Left ? -areaResolution : areaResolution);
                    //Snake has ran into itself, game over
                    if (snakeCoordinates.Contains(newCoordinate))
                    {
                        gameOver = true;
                        return;
                    }
                    if (newCoordinate < gameBlocks.Length)
                    {
                        for (int i = snakeCoordinates.Count - 1; i > 0; i--)
                        {
                            snakeCoordinates[i] = snakeCoordinates[i - 1];
                        }
                        snakeCoordinates[0] = newCoordinate;
                        gameBlocks[snakeCoordinates[0]].transform.localEulerAngles = new Vector3(90, (snakeDirection == Direction.Left ? -90 : 90), 0);
                    }
                }
                else if (snakeDirection == Direction.Up || snakeDirection == Direction.Down)
                {
                    //Detect if snake hits the top or bottom
                    if (snakeDirection == Direction.Up && (snakeCoordinates[0] + 1) % areaResolution == 0)
                    {
                        gameOver = true;
                        return;
                    }
                    else if (snakeDirection == Direction.Down && (snakeCoordinates[0] + 1) % areaResolution == 1)
                    {
                        gameOver = true;
                        return;
                    }

                    int newCoordinate = snakeCoordinates[0] + (snakeDirection == Direction.Down ? -1 : 1);
                    //Snake has ran into itself, game over
                    if (snakeCoordinates.Contains(newCoordinate))
                    {
                        gameOver = true;
                        return;
                    }
                    if (newCoordinate < gameBlocks.Length)
                    {
                        for (int i = snakeCoordinates.Count - 1; i > 0; i--)
                        {
                            snakeCoordinates[i] = snakeCoordinates[i - 1];
                        }
                        snakeCoordinates[0] = newCoordinate;
                        gameBlocks[snakeCoordinates[0]].transform.localEulerAngles = new Vector3(90, (snakeDirection == Direction.Down ? 180 : 0), 0);
                    }
                }

                ApplyMaterials();
            }

            if (Input.GetKeyDown(KeyCode.RightArrow))
            {
                int newCoordinate = snakeCoordinates[0] + areaResolution;
                if (!ContainsCoordinate(newCoordinate))
                {
                    snakeDirection = Direction.Right;
                }
            }
            if (Input.GetKeyDown(KeyCode.LeftArrow))
            {
                int newCoordinate = snakeCoordinates[0] - areaResolution;
                if (!ContainsCoordinate(newCoordinate))
                {
                    snakeDirection = Direction.Left;
                }
            }
            if (Input.GetKeyDown(KeyCode.UpArrow))
            {
                int newCoordinate = snakeCoordinates[0] + 1;
                if (!ContainsCoordinate(newCoordinate))
                {
                    snakeDirection = Direction.Up;
                }
            }
            if (Input.GetKeyDown(KeyCode.DownArrow))
            {
                int newCoordinate = snakeCoordinates[0] - 1;
                if (!ContainsCoordinate(newCoordinate))
                {
                    snakeDirection = Direction.Down;
                }
            }
        }

        if (fruitBlockIndex < 0)
        {
            //Place a fruit block
            int indexTmp = Random.Range(0, gameBlocks.Length - 1);

            //Check if the block is not occupied with a snake block
            for (int i = 0; i < snakeCoordinates.Count; i++)
            {
                if (snakeCoordinates[i] == indexTmp)
                {
                    indexTmp = -1;
                    break;
                }
            }

            fruitBlockIndex = indexTmp;
        }
    }

    void ApplyMaterials()
    {
        //Apply Snake material
        for (int i = 0; i < gameBlocks.Length; i++)
        {
            gameBlocks[i].sharedMaterial = groundMaterial;
            bool fruitPicked = false;
            for (int a = 0; a < snakeCoordinates.Count; a++)
            {
                if (snakeCoordinates[a] == i)
                {
                    gameBlocks[i].sharedMaterial = (a == 0 ? headMaterial : snakeMaterial);
                }
                if (snakeCoordinates[a] == fruitBlockIndex)
                {
                    //Pick a fruit
                    fruitPicked = true;
                }
            }
            if (fruitPicked)
            {
                fruitBlockIndex = -1;
                //Add new block
                int snakeBlockRotationY = (int)gameBlocks[snakeCoordinates[snakeCoordinates.Count - 1]].transform.localEulerAngles.y;
                //print(snakeBlockRotationY);
                if (snakeBlockRotationY == 270)
                {
                    snakeCoordinates.Add(snakeCoordinates[snakeCoordinates.Count - 1] + areaResolution);
                }
                else if (snakeBlockRotationY == 90)
                {
                    snakeCoordinates.Add(snakeCoordinates[snakeCoordinates.Count - 1] - areaResolution);
                }
                else if (snakeBlockRotationY == 0)
                {
                    snakeCoordinates.Add(snakeCoordinates[snakeCoordinates.Count - 1] + 1);
                }
                else if (snakeBlockRotationY == 180)
                {
                    snakeCoordinates.Add(snakeCoordinates[snakeCoordinates.Count - 1] - 1);
                }
                totalPoints++;
            }
            if (i == fruitBlockIndex)
            {
                gameBlocks[i].sharedMaterial = fruitMaterial;
                gameBlocks[i].transform.localEulerAngles = new Vector3(90, 0, 0);
            }
        }
    }

    bool ContainsCoordinate(int coordinate)
    {
        for (int i = 0; i < snakeCoordinates.Count; i++)
        {
            if (snakeCoordinates[i] == coordinate)
            {
                return true;
            }
        }

        return false;
    }

    void OnGUI()
    {
        //Display Player score and other info 
        if (gameStarted)
        {
            GUI.Label(new Rect(Screen.width / 2 - 100, 5, 200, 20), totalPoints.ToString(), mainStyle);
        }
        else
        {
            GUI.Label(new Rect(Screen.width / 2 - 100, Screen.height / 2 - 10, 200, 20), "Press Any Key to Play\n(Use Arrows to Change Direction)", mainStyle);
        }
        if (gameOver)
        {
            GUI.Label(new Rect(Screen.width / 2 - 100, Screen.height / 2 - 20, 200, 40), "Game Over\n(Press 'Space' to Restart)", mainStyle);
        }
    }
}

ऊपर दी गई स्क्रिप्ट आदिम चतुर्भुजों का एक ग्रिड बनाती है, फिर उनकी सामग्री को चार में से एक में बदल देती है: एक पृष्ठभूमि सामग्री, एक साँप के सिर की सामग्री, एक साँप के शरीर की सामग्री, या एक सेब की सामग्री। यह स्वचालित रूप से कैमरे को सीधे ग्रिड सिस्टम के ऊपर रखता है और सभी ब्लॉकों की सामूहिक सीमाओं को समाहित करने के लिए इसके ऑर्थोग्राफ़िक आकार को बदलता है।

चरण 2: साँप गेम सेटअप करें

अब आइए उपरोक्त स्क्रिप्ट का उपयोग करके स्नेक गेम सेट करें:

नया दृश्य बनाएँ
गेम दृश्य का रिज़ॉल्यूशन बदलें ताकि चौड़ाई और ऊंचाई बराबर हो जाए (उदाहरण: 600px x 600px)

एक नया गेमऑब्जेक्ट बनाएं (गेमऑब्जेक्ट -> खाली बनाएं) और इसे नाम दें "_GameGenerator"
SC_SnakeGameGenerator.cs स्क्रिप्ट को _GameGenerator ऑब्जेक्ट से जोड़ें

जैसा कि आप देखेंगे कि SC_SnakeGameGenerator में कुछ चर हैं जिन्हें निर्दिष्ट करने की आवश्यकता है:

मुख्य कैमरा चर स्व-व्याख्यात्मक है, डिफ़ॉल्ट मुख्य कैमरा निर्दिष्ट करें।
अब materials के लिए, 4 सामग्रियां बनाएं (राइट क्लिक -> बनाएं -> सामग्री) और उन्हें क्रमशः "ground_material", "snake_material", "head_material" और "fruit_material" नाम दें: