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using System.Collections.Generic;
using UnityEngine;
public class PointGenerator
{
private int m_amount;
private float m_gridSize = 8f;
private Vector2Int m_currentCenterGrid = new Vector2Int(99999, 99999);
private int m_currentGridWith;
private List<Vector3> m_points = new List<Vector3>();
public PointGenerator(int amount, float gridSize)
{
m_amount = amount;
m_gridSize = gridSize;
}
public void Update(Vector3 center, float radius, List<Vector3> newPoints, List<Vector3> removedPoints)
{
Vector2Int grid = GetGrid(center);
if (m_currentCenterGrid == grid)
{
newPoints.Clear();
removedPoints.Clear();
return;
}
int num = Mathf.CeilToInt(radius / m_gridSize);
if (m_currentCenterGrid != grid || m_currentGridWith != num)
{
RegeneratePoints(grid, num);
}
}
private void RegeneratePoints(Vector2Int centerGrid, int gridWith)
{
m_currentCenterGrid = centerGrid;
Random.State state = Random.state;
m_points.Clear();
for (int i = centerGrid.y - gridWith; i <= centerGrid.y + gridWith; i++)
{
for (int j = centerGrid.x - gridWith; j <= centerGrid.x + gridWith; j++)
{
Random.InitState(j + i * 100);
Vector3 gridPos = GetGridPos(new Vector2Int(j, i));
for (int k = 0; k < m_amount; k++)
{
Vector3 item = new Vector3(Random.Range(gridPos.x - m_gridSize, gridPos.x + m_gridSize), Random.Range(gridPos.z - m_gridSize, gridPos.z + m_gridSize));
m_points.Add(item);
}
}
}
Random.state = state;
}
public Vector2Int GetGrid(Vector3 point)
{
int x = Mathf.FloorToInt((point.x + m_gridSize / 2f) / m_gridSize);
int y = Mathf.FloorToInt((point.z + m_gridSize / 2f) / m_gridSize);
return new Vector2Int(x, y);
}
public Vector3 GetGridPos(Vector2Int grid)
{
return new Vector3((float)grid.x * m_gridSize, 0f, (float)grid.y * m_gridSize);
}
}
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