Unity Vector2の基本的な使い方

目次

加算

プログラム例

using UnityEngine;

public class Vector2Sample0 : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Vector2 vect1 = new Vector2(0, 2.5f);
        Vector2 vect2 = new Vector2(1.2f, 2.3f);
        Debug.Log(vect1 + vect2);
    }
}

実行結果

(1.2, 4.8)

正規化

プログラム例

using UnityEngine;

public class Vector2Sample1 : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Vector2 vect1 = new Vector2(3, 4);
        Vector2 normal = vect1.normalized;
        Debug.Log(normal);
    }
}

実行結果

(0.6, 0.8)

内積

プログラム例

using UnityEngine;

public class Vector2Sample2 : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Vector2 vect1 = new Vector2(3, 4);
        Vector2 vect2 = new Vector2(1, 2);
        Debug.Log(Vector2.Dot(vect1, vect2));
    }
}

実行結果

11

角度の測定

using UnityEngine;

public class Vector2Sample3 : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Vector2 vect1 = new Vector2(1, 0);
        Vector2 vect2 = new Vector2(1, 1);
        Vector2 vect3 = new Vector2(-0.5f, -Mathf.Sqrt(3) / 2);

        Debug.Log("符号無し");
        Debug.Log(Vector2.Angle(vect1, vect2));
        Debug.Log(Vector2.Angle(vect2, vect1));
        Debug.Log(Vector2.Angle(vect1, vect3));

        Debug.Log("符号あり");
        Debug.Log(Vector2.SignedAngle(vect1, vect2));
        Debug.Log(Vector2.SignedAngle(vect2, vect1));
    }
}

実行結果

符号無し
45
45
120
符号あり
45
-45

ベクトルの大きさ

using UnityEngine;

public class Vector2Sample4 : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Vector2 vect = new Vector2(3, 4);
        Debug.Log("大きさ:" + vect.magnitude);
        Debug.Log("大きさの2乗:" + vect.sqrMagnitude);
    }
}

実行結果

大きさ:5
大きさの2乗:25

static変数

名前	x座標	y座標
Vector2.right	1	0
Vector2.up	0	1
Vector2.left	-1	0
Vector2.down	0	-1
Vector2.zero	0	0

位置ベクトル間の距離

using UnityEngine;

public class Vector2Sample5 : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Vector2 vect1 = new Vector2(2, 4);
        Vector2 vect2 = Vector2.left;
        Debug.Log(Vector2.Distance(vect1, vect2));
    }
}

実行結果

5