public class MyGraph : MonoBehaviour
{
    [SerializeField]
    private Sprite circleSprite;	//需要畫的圖像，這里賦值為了一個Unity自帶的圓形，也可改為其它圖形

    private RectTransform graphContainer;	//聲明一個 RectTransform，用于修改圖片的大小
    
    private void Awake()
    {
        //獲取graphContainer的RectTransform并賦值，為內(nèi)側(cè)的小矩形，會作為我們的畫板
        graphContainer = transform.Find("GraphContainer").GetComponent<RectTransform>();
        CreateCircle(new Vector2(200, 200));	//在(200，200)的地方創(chuàng)建圓，用于測試
    }

    private void CreateCircle(Vector2 anchoredPosition)
    {
        GameObject gameObject = new GameObject("circle", typeof(Image));	//生成新物體，該物體包含一個圖片組件
        gameObject.transform.SetParent(graphContainer, false);			//將圖片設(shè)為graphContainer的子物體
        gameObject.GetComponent<Image>().sprite = circleSprite;			//將圖片賦值為Inspector中設(shè)置的圖片

        //獲取新建圖片物體的RectTransform并賦值
        RectTransform rectTransform = gameObject.GetComponent<RectTransform>();
        rectTransform.anchoredPosition = anchoredPosition;			//設(shè)置圖片位置
        rectTransform.sizeDelta = new Vector2(20, 20);				//設(shè)置圖片大小，可設(shè)為公共變量來修改
        
        //下面兩句將生成圖片的錨點設(shè)為了父物體左下角(原點)
        rectTransform.anchorMin = new Vector2(0, 0);
        rectTransform.anchorMax = new Vector2(0, 0);
    }
}

public class MyGraph : MonoBehaviour
{
    //[SerializeField]
    //private Sprite circleSprite;

    //private RectTransform graphContainer;
    private void Awake()
    {
        //graphContainer = transform.Find("GraphContainer").GetComponent<RectTransform>();
        //聲明一個列表用于測試
        List<int> valueList = new List<int>() { 1, 2, 4, 9, 16, 25, 36, 49, 64, 81, 100, 80, 50, 20, 10 };
        ShowGraph(valueList);
    }

    private void CreateCircle(Vector2 anchoredPosition)
    {
        ......
    }

    private void ShowGraph(List<int> valueList)
    {
        int maxValue = 0;
        foreach (int value in valueList)	//找出列表中的最大值
        {
            if (maxValue <= value)
            {
                maxValue = value;
            }
        }
        
        float graphWidth = graphContainer.sizeDelta.x;	    //獲取畫布graphContainer的寬度
        float graphHeight = graphContainer.sizeDelta.y;	    //獲取畫布graphContainer的高度

        float xSpace = graphWidth / (valueList.Count - 1);  //數(shù)據(jù)點x坐標的間距
        float ySpace = graphHeight / maxValue;		    //數(shù)據(jù)的y坐標的比例

        for (int i = 0; i < valueList.Count; i++)
        {
            float xPos = i * xSpace;			    //x坐標為線性固定增長
            float yPos = ySpace * valueList[i];		    //y坐標是以列表中最大值為畫布高度，按值的大小與最大值的比例取高度
            CreateCircle(new Vector2(xPos, yPos));	    //畫出點
        }
    }
}

public class MyGraph : MonoBehaviour
{
    ......
    private void ShowGraph(List<int> valueList)
    {
        ......

        float xSpace = graphWidth / (valueList.Count - 1);
        float ySpace = graphHeight / maxValue;

        GameObject lastPoint = null;	//用于保存上一個點，畫出上一個點到現(xiàn)在點的連線，這樣就不用管最后一個點
        for (int i = 0; i < valueList.Count; i++)
        {
            //float xPos = i * xSpace;
            //float yPos = ySpace * valueList[i];
            
            GameObject circleGameobject = CreateCircle(new Vector2(xPos, yPos));//獲取創(chuàng)建的點
            if (lastPoint != null)
            {
                //畫線，參數(shù)為上一個點的位置，和當前點的位置
                DrawLine(lastPoint.GetComponent<RectTransform>().anchoredPosition, circleGameobject.GetComponent<RectTransform>().anchoredPosition);
            }
            lastPoint = circleGameobject;	//畫完連線之后，變?yōu)樯弦粋€點
        }
    }

    private void DrawLine(Vector2 pointA, Vector2 pointB)	//畫線方法
    {
        GameObject gameObject = new GameObject("line", typeof(Image));//新建一個物體包含一個Image組件
        gameObject.transform.SetParent(graphContainer, false);		 //將該圖片設(shè)為graphContainer的子物體
																//就是在畫板內(nèi)畫線
        RectTransform rectTransform = gameObject.GetComponent<RectTransform>();	//獲取 RectTransform 組件
        Vector2 dir = pointB - pointA;	//兩點間的向量

        //同樣將線段錨點設(shè)為畫板左下角(原點)
        rectTransform.anchorMin = new Vector2(0, 0);
        rectTransform.anchorMax = new Vector2(0, 0);
        rectTransform.sizeDelta = new Vector2(dir.magnitude, 3f);	//線段的長寬，長為兩點間向量的長度，就是兩點間距離

        rectTransform.anchoredPosition = pointA + dir / 2;			//線段的中心點，為兩點間的中心點
        float angle = RotateAngle(dir.x, dir.y);				   //線段的旋轉(zhuǎn)角度
        rectTransform.localEulerAngles = new Vector3(0, 0, angle);	//旋轉(zhuǎn)線段
    }
    private float RotateAngle(float x, float y)	//旋轉(zhuǎn)方法
    {
        float angle = Mathf.Atan2(y, x) * 180 / 3.14f;//Atan2返回的是弧度，需要乘以180/PI得到角度，這里PI直接用了3.14
        return angle;
    }
}