Improve how distance based quality is determined

src/main/java/com/seibel/lod/enums/LodDetail.java

@@ -17,13 +17,17 @@
  */
 package com.seibel.lod.enums;
 
+import java.util.ArrayList;
+import java.util.Collections;
+
 import com.seibel.lod.objects.LodDataPoint;
+import com.seibel.lod.util.LodUtil;
 
 /**
  * single, double, quad, half, full
  * 
  * @author James Seibel
- * @version 8-10-2021
+ * @version 8-11-2021
  */
 public enum LodDetail
 {
@@ -48,7 +52,8 @@ public enum LodDetail
 	public final int dataPointLengthCount;
 	/** How wide each LOD DataPoint is */
 	public final int dataPointWidth;
-	/** This is the same as detailLevel in LodQuadTreeNode */
+	/** This is the same as detailLevel in LodQuadTreeNode, 
+	 * lowest is 0 highest is 9 */
 	public final int detailLevel;
 	
 	/* Start/End X/Z give the block positions
@@ -63,6 +68,15 @@ public enum LodDetail
 	 * when creating a LodChunk with this detail level */
 	public final int lodChunkStringDelimiterCount;
 	
+	/** 
+	 * 1st dimension: LodDetail.detailLevel <br>
+	 * 2nd dimension: An array of all LodDetails that are less than or <br>
+	 *                equal to that detailLevel
+	 */
+	private static LodDetail[][] lowerDetailArrays;
+	
+	
+	
 	
 	private LodDetail(int newLengthCount, int newDetailLevel)
 	{
@@ -96,4 +110,57 @@ public enum LodDetail
 		lodChunkStringDelimiterCount = 2 + (dataPointLengthCount * dataPointLengthCount * LodDataPoint.NUMBER_OF_DELIMITERS);
 		
 	}// constructor
+	
+	
+	
+	
+	
+	
+	/** 
+	 * Returns an array of all LodDetails that have a detail level
+	 * that is less than or equal to the given LodDetail
+	 */
+	public static LodDetail[] getSelfAndLowerDetails(LodDetail detail)
+	{
+		if (lowerDetailArrays == null)
+		{
+			// run first time setup
+			lowerDetailArrays = new LodDetail[LodDetail.values().length][];
+			
+			// go through each LodDetail
+			for(LodDetail currentDetail : LodDetail.values())
+			{
+				ArrayList<LodDetail> lowerDetails = new ArrayList<>();
+				
+				// find the details lower than currentDetail
+				for(LodDetail compareDetail : LodDetail.values())
+				{
+					if (currentDetail.detailLevel <= compareDetail.detailLevel)
+					{
+						lowerDetails.add(compareDetail);
+					}
+				}
+				
+				// have the highest detail item first in the list
+				Collections.sort(lowerDetails);
+				Collections.reverse(lowerDetails);
+				
+				lowerDetailArrays[currentDetail.detailLevel] = lowerDetails.toArray(new LodDetail[lowerDetails.size()]); 
+			}
+		}
+		
+		return lowerDetailArrays[detail.detailLevel];
+	}
+	
+	/** Returns what detail level should be used at a given distance and maxDistance. */
+	public static LodDetail getDetailForDistance(LodDetail maxDetailLevel, int distance, int maxDistance)
+	{
+		LodDetail[] lowerDetails = getSelfAndLowerDetails(maxDetailLevel);
+		int distaneBetweenDetails = maxDistance / lowerDetails.length;
+		int index = LodUtil.clamp(0, distance / distaneBetweenDetails, lowerDetails.length - 1);
+		
+		return lowerDetails[index];
+		
+	}
+	
 }