Unity でスネーク ゲームを作成する方法
この記事では、Unity で古典的な Snake Game を作成する方法を説明します。
Unity このチュートリアルで使用されるバージョン: Unity 2018.3.0f2 (64 ビット)
ステップ 1: スクリプトを作成する
"One Script Game" であるため、このチュートリアルに必要なスクリプトは 1 つだけです。
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);
}
}
}上記のスクリプトは、プリミティブ クワッドのグリッドを作成し、そのマテリアルを背景マテリアル、スネークヘッド マテリアル、ヘビ ボディ マテリアル、またはリンゴ マテリアルの 4 つのうちの 1 つに変更します。また、カメラをグリッド システムの真上に自動的に配置し、その正投影サイズを変更して、すべてのブロックの集合的な境界をカプセル化します。
ステップ 2: スネーク ゲームをセットアップする
次に、上記のスクリプトを使用して Snake ゲームをセットアップしましょう。
- 新しいシーンを作成する
- 幅と高さが同じになるようにゲーム ビューの解像度を変更します (例: 600px x 600px)。
- 新しいゲームオブジェクトを作成し (GameObject -> Create Empty)、名前を付けます。 "_GameGenerator"
- SC_SnakeGameGenerator.cs スクリプトを _GameGenerator オブジェクトにアタッチします
ご覧のとおり、SC_SnakeGameGenerator には割り当てる必要のある変数がいくつかあります。
- メイン カメラ 変数は一目瞭然で、デフォルトのメイン カメラを割り当てます。
- マテリアル については、4 つのマテリアルを作成し (右クリック -> [作成] -> [マテリアル])、それぞれに "ground_material"、"snake_material"、"head_material"、および "fruit_material" という名前を付けます。
ground_material の場合、Shader を Unlit/Color に変更し、Main Color を黒に変更します。
他の 3 マテリアル については、シェーダを Unlit/Texture に変更し、以下のテクスチャを割り当てます。
Snake_material の場合:
head_material の場合:
果物_材料の場合:
- マテリアルを変数に代入する
次に、[Play] をクリックしてゲームをテストします。
すべて期待通りに動作し、Unity でプレイ可能な スネーク ゲーム が完成しました。