通过2D网格坐标选取游戏地形（UI网格）

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通过2D网格坐标选取游戏地形。

步骤：

1.通过行列坐标对当前屏幕进行网格切分

2.确定最小的网格单元

3.获取点击位置信息，与最小单元相除，向下取整，从而获取点击位置信息的所属网格

网格系统创建方式：

1.以行列数为准，通过长宽的限定，确定单元网格大小

2.以单元网格大小为准，通过长宽的限定，确定行列数。

using System.Collections;

using System.Collections.Generic;
using UnityEngine;

public class SelectPosition : MonoBehaviour
{
public int rows = 40;
public int cloumns = 40;
public bool isShowGrids = false;

public GameObject tipPrefab;

GameObject tip;
UIGridsHelper helper;

void Awake()
{
helper = new UIGridsHelper(rows, cloumns);
}

void Start()
{
helper.CreatTestInfos();

tip = GameObject.Instantiate(tipPrefab);
tip.transform.SetParent(this.transform);
}

void Update()
{
if (Input.GetMouseButtonDown(0))
{
helper.GetGridsInfoID(Input.mousePosition);
ShowTips();
}

if (isShowGrids)
helper.ShowGrids();
}

/// <summary>
/// 鼠标点击处显示提示
/// </summary>
void ShowTips()
{
Vector3 followPosition;
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(tip.GetComponent<RectTransform>(), Input.mousePosition, null, out followPosition))
tip.GetComponent<RectTransform>().position = followPosition;
}

}

using System.Collections.Generic;
using UnityEngine;

public class UIGridsHelper : MonoBehaviour
{
private int totalRows = 2;
private int totalCloumns = 2;

public UIGridsHelper(int totalRows, int totalCloumns )
{
this.totalRows = totalRows;
this.totalCloumns = totalCloumns;
}

public Vector2 CaculateGrid(Vector3 pos)
{
Vector2 cell = GetCell();

Vector2 grid = new Vector2();
grid.x = Mathf.FloorToInt(pos.x / cell.x);
grid.y = Mathf.FloorToInt(pos.y / cell.y);

return grid;
}

public int GetGridsInfoID(Vector3 pos)
{
int id = 0;
Vector2 grid = CaculateGrid(pos);

List<GridInfo> infos = CreatTestInfos();
foreach (var item in infos)
{
if (item.grid.x == grid.x && item.grid.y == grid.y)
{
id = item.id;
break;
}
}

Debug.LogError(id);
return id;
}

public Vector2 GetCell()
{
Vector2 cellSize = new Vector2();
cellSize.x = Mathf.FloorToInt(Screen.width / totalCloumns);
cellSize.y = Mathf.FloorToInt(Screen.height / totalRows);
return cellSize;
}

public void ShowGrids()
{
Vector2 cell = GetCell();

int rowNumber = totalRows;
int cloumnNumber = totalCloumns;

for (int i = 0; i < rowNumber; i++)
Debug.DrawLine(new Vector3(0, i * cell.y, 0), new Vector3(Screen.width, i * cell.y, 0));
for (int i = 0; i < cloumnNumber; i++)
Debug.DrawLine(new Vector3(i * cell.x, 0, 0), new Vector3(i * cell.x, Screen.height, 0));
}

/// <summary>
/// 测试
/// </summary>
/// <returns></returns>
public List<GridInfo> CreatTestInfos()
{
List<GridInfo> target = new List<GridInfo>();
int id = -1;

for (int i = 0; i < totalCloumns; i++)
{
id++;
for (int j = 0; j < totalRows; j++)
{
id++;
GridInfo info = new GridInfo();
info.id = id;
info.grid = new Vector2(i, j);

target.Add(info);
}
}

return target;
}

}

public class GridInfo
{
public int id;
public Vector2 grid;
}

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