From 4dd947b261499dc8f747349912b2310e03212b10 Mon Sep 17 00:00:00 2001
From: David Luzar <luzar.david@gmail.com>
Date: Sat, 4 Apr 2020 18:45:14 +0200
Subject: [PATCH] fix scrollToCenter when no elements supplied (#1222)

* fix scrollToCenter when no elements supplied

* make getCommonBounds return default values on empty elements
---
 src/element/bounds.ts | 4 ++++
 src/scene/scroll.ts   | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/element/bounds.ts b/src/element/bounds.ts
index bee744fb..ed424396 100644
--- a/src/element/bounds.ts
+++ b/src/element/bounds.ts
@@ -187,6 +187,10 @@ export function getArrowPoints(
 }
 
 export function getCommonBounds(elements: readonly ExcalidrawElement[]) {
+  if (!elements.length) {
+    return [0, 0, 0, 0];
+  }
+
   let minX = Infinity;
   let maxX = -Infinity;
   let minY = Infinity;
diff --git a/src/scene/scroll.ts b/src/scene/scroll.ts
index d065f2dd..e77c00fa 100644
--- a/src/scene/scroll.ts
+++ b/src/scene/scroll.ts
@@ -9,6 +9,13 @@ export function normalizeScroll(pos: number) {
 export function calculateScrollCenter(
   elements: readonly ExcalidrawElement[],
 ): { scrollX: FlooredNumber; scrollY: FlooredNumber } {
+  if (!elements.length) {
+    return {
+      scrollX: normalizeScroll(0),
+      scrollY: normalizeScroll(0),
+    };
+  }
+
   const [x1, y1, x2, y2] = getCommonBounds(elements);
 
   const centerX = (x1 + x2) / 2;