private void DrawColliders(QuadtreeNode quadtreeNode)
{
foreach (QuadtreeCollider collider in GetColliders(quadtreeNode))
{
DrawCollider(collider);
}
}
private void DrawChildrenNode(QuadtreeNode quadtreeNode)
{
foreach (QuadtreeNode child in GetChildren(quadtreeNode))
{
DrawQuadtreeNodes(child);
}
}
/// <summary>
/// 绘制节点
/// </summary>
/// <param name="node"></param>
private void DrawNode(QuadtreeNode node)
{
Gizmos.color = GetNodeColor(node);
// 绘制节点信息
DrawNodeInfomationText(node);
}
/// <summary>
/// 判断一个四叉树节点是否有子节点
/// </summary>
/// <param name="quadtreeNode"></param>
/// <returns></returns>
private bool HaveChildren(QuadtreeNode quadtreeNode)
{
MethodInfo method = typeof(QuadtreeNode).GetMethod("HaveChildren", BindingFlags.Instance | BindingFlags.NonPublic);
//Debug.Log("检测节点 " + quadtreeNode + " 有没有子节点：" + (bool)method.Invoke(quadtreeNode, null));
return((bool)method.Invoke(quadtreeNode, null));
}
private void DrawTipNode(QuadtreeNode quadtreeNode)
{
Gizmos.color = GetNodeColor(quadtreeNode);
Handles.color = GetNodeColor(quadtreeNode);
DrawArea(quadtreeNode);
DrawColliders(quadtreeNode);
}
private string GetNodeInfomationText(QuadtreeNode node)
{
string infomation = "";
infomation += "总碰撞器数：" + GetColliders(node).Count + "\n";
infomation += "最大检测半径：" + GetMaxRadius(node) + "\n";
return(infomation);
}
private Color GetNodeColor(QuadtreeNode quadtreeNode)
{
Rect rootArea = GetArea(GetQuadtreeRoot());
Rect area = GetArea(quadtreeNode);
float xLerp = Mathf.InverseLerp(rootArea.xMin, rootArea.xMax, area.x);
float yLerp = Mathf.InverseLerp(rootArea.yMin, rootArea.yMax, area.y);
return(new Color(xLerp, yLerp, 0.5f));
}
/// <summary>
/// 绘制末端节点
/// </summary>
/// <param name="quadtreeNode"></param>
private void DrawTipNode(QuadtreeNode quadtreeNode)
{
// 根据节点设置颜色
Gizmos.color = GetNodeColor(quadtreeNode);
Handles.color = GetNodeColor(quadtreeNode);
// 绘制节点区域
DrawArea(quadtreeNode);
// 绘制节点中的碰撞器
DrawColliders(quadtreeNode);
}
private void DrawQuadtreeNodes(QuadtreeNode quadtreeNode)
{
if (HaveChildren(quadtreeNode))
{
DrawChildrenNode(quadtreeNode);
}
else
{
DrawTipNode(quadtreeNode);
}
DrawNode(quadtreeNode);
}
/// <summary>
/// 根据节点位置获取节点颜色
/// </summary>
/// <param name="quadtreeNode"></param>
/// <returns></returns>
private Color GetNodeColor(QuadtreeNode quadtreeNode)
{
// 获取根节点范围和要获取颜色的节点的范围，后续根据这两个范围确认颜色
Rect rootArea = GetArea(GetQuadtreeRoot());
Rect area = GetArea(quadtreeNode);
// 计算要获取颜色的节点的位置在根节点范围中的比例
float xLerp = Mathf.InverseLerp(rootArea.xMin, rootArea.xMax, area.x);
float yLerp = Mathf.InverseLerp(rootArea.yMin, rootArea.yMax, area.y);
// 通过位置比例返回颜色，越靠右越红，越靠上越绿
return(new Color(xLerp, yLerp, 0.5f));
}
/// <summary>
/// 绘制四叉树指定节点
/// </summary>
/// <param name="quadtreeNode"></param>
private void DrawQuadtreeNodes(QuadtreeNode quadtreeNode)
{
if (HaveChildren(quadtreeNode))
{
// 有子节点的情况下，绘制子节点
DrawChildrenNode(quadtreeNode);
}
else
{
// 没有子节点，绘制末端节点
DrawTipNode(quadtreeNode);
}
// 绘制节点
DrawNode(quadtreeNode);
}
private void DrawArea(QuadtreeNode quadtreeNode)
{
//Debug.Log("绘制区域为 " + GetArea(quadtreeNode) + " 的节点的区域");
Rect area = GetArea(quadtreeNode);
Vector3 topRight = new Vector3(area.xMax, area.yMax, 0);
Vector3 bottomRight = new Vector3(area.xMax, area.y, 0);
Vector3 bottomLeft = new Vector3(area.x, area.y, 0);
Vector3 topLeft = new Vector3(area.x, area.yMax, 0);
Gizmos.DrawLine(topLeft, topRight);
Gizmos.DrawLine(topRight, bottomRight);
Gizmos.DrawLine(bottomRight, bottomLeft);
Gizmos.DrawLine(bottomLeft, topLeft);
}
/// <summary>
/// 从当前节点开始，向上合并节点，直到不能合并为止
/// </summary>
/// <returns></returns>
private OperationResult UpwordMerge()
{
// 先准备一个合并失败的结果
OperationResult result = new OperationResult(false);
// 从当前节点开始
QuadtreeNode currentNode = this;
// 逻辑比较繁琐，使用死循环加跳出
while (true)
{
// 当前节点是 null，这种情况是合并完了根节点后的循环，直接结束循环
if (currentNode == null)
{
break;
}
// 当前节点是末梢，末梢本身不能合并，向上一级
if (!currentNode.HaveChildren())
{
// 向上一级
currentNode = currentNode.parent;
// 再次循环
continue;
}
// 当前节点不能合并，结束合并
if (!currentNode.NeedMerge())
{
break;
}
// 合并并记录结果
result = currentNode.Merge();
// 向上移一级
currentNode = currentNode.parent;
}
return(result);
}
/// <summary>
/// 获取最大半径
/// </summary>
/// <param name="quadtreeNode"></param>
/// <returns></returns>
private float GetMaxRadius(QuadtreeNode quadtreeNode)
{
return((float)typeof(QuadtreeNode).GetField("maxRadius", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(quadtreeNode));
}
/// <summary>
/// 绘制节点信息
/// </summary>
/// <param name="node"></param>
private void DrawNodeInfomationText(QuadtreeNode node)
{
Handles.Label(GetArea(node).center, GetNodeInfomationText(node));
}
private void Awake()
{
_root = new QuadtreeNode(QuadtreeConfig.startArea); // 节点创建过程中使用了Resources.Load，这个方法不能通过类的字段声明时赋值来调用
}
/// <summary>
/// 获取一个节点及其所有子节点的碰撞器总数
/// </summary>
/// <param name="quadtreeNode"></param>
/// <returns></returns>
private int GetCollidersNumber(QuadtreeNode quadtreeNode)
{
return((int)typeof(QuadtreeNode).GetMethod("GetColliderNumbers", BindingFlags.Instance | BindingFlags.NonPublic).Invoke(quadtreeNode, new object[0]));
}
/// <summary>
/// 获取一个节点的所有碰撞器
/// </summary>
/// <param name="quadtreeNode"></param>
/// <returns></returns>
private List <QuadtreeCollider> GetColliders(QuadtreeNode quadtreeNode)
{
return((List <QuadtreeCollider>) typeof(QuadtreeNode).GetField("colliders", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(quadtreeNode));
}
/// <summary>
/// 获取指定节点的区域
/// </summary>
/// <param name="quadtreeNode"></param>
/// <returns></returns>
private Rect GetArea(QuadtreeNode quadtreeNode)
{
return((Rect)typeof(QuadtreeNode).GetField("area", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(quadtreeNode));
}
/// <summary>
/// 获取一个四叉树节点的所有子节点
/// </summary>
/// <param name="quadtreeNode"></param>
/// <returns></returns>
private IEnumerable <QuadtreeNode> GetChildren(QuadtreeNode quadtreeNode)
{
return((List <QuadtreeNode>) typeof(QuadtreeNode).GetField("children", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(quadtreeNode));
}
/// <summary>
/// 根节点之外的节点的构造方法
/// </summary>
/// <param name="area"></param>
/// <param name="parent"></param>
internal QuadtreeNode(Rect area, QuadtreeNode parent) : this(area)
{
this.parent = parent;
}