From 51ef4a52cd21a7ce188163579c9e31406f50ba11 Mon Sep 17 00:00:00 2001
From: HF <hf@pixelplanet.fun>
Date: Fri, 23 Feb 2024 22:21:20 +0100
Subject: [PATCH] fix historical pixel selection

---
 src/ui/Chunk2D.js       | 7 ++++---
 src/ui/ChunkLoader2D.js | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/ui/Chunk2D.js b/src/ui/Chunk2D.js
index 0c545b57..232185cd 100644
--- a/src/ui/Chunk2D.js
+++ b/src/ui/Chunk2D.js
@@ -86,10 +86,11 @@ class Chunk2D extends Chunk {
   getColorIndex(cell, nearest = true) {
     const [x, y] = cell;
     const ctx = this.image.getContext('2d');
-    const rgb = ctx.getImageData(x, y, 1, 1).data;
+    const rgba = ctx.getImageData(x, y, 1, 1).data;
+    if (!nearest && rgba[3] === 0) return null;
     const ind = (nearest)
-      ? this.palette.getClosestIndexOfColor(rgb[0], rgb[1], rgb[2])
-      : this.palette.getIndexOfColor(rgb[0], rgb[1], rgb[2]);
+      ? this.palette.getClosestIndexOfColor(rgba[0], rgba[1], rgba[2])
+      : this.palette.getIndexOfColor(rgba[0], rgba[1], rgba[2]);
     return ind;
   }
 
diff --git a/src/ui/ChunkLoader2D.js b/src/ui/ChunkLoader2D.js
index d36611fb..375e5928 100644
--- a/src/ui/ChunkLoader2D.js
+++ b/src/ui/ChunkLoader2D.js
@@ -89,7 +89,7 @@ class ChunkLoader2D extends ChunkLoader {
     const px = getCellInsideChunk(historicalCanvasSize, [x, y]);
     const curTime = Date.now();
 
-    if (historicalTime && historicalTime !== '0000') {
+    if (historicalTime && historicalTime && historicalTime !== '0000') {
       // eslint-disable-next-line max-len
       const incrementalChunkKey = `${historicalDate}${historicalTime}:${cx}:${cy}`;
       const incrementalChunk = this.cget(incrementalChunkKey);