fix: Two finger panning is slow (#7849)

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>
2024-05-19 14:23:43 +02:00
parent ff0b4394b1
commit be4e127f6c
2 changed files with 8 additions and 5 deletions
@@ -5097,8 +5097,11 @@ class App extends React.Component<AppProps, AppState> {

        this.translateCanvas({
          zoom: zoomState.zoom,
-          scrollX: zoomState.scrollX + deltaX / nextZoom,
-          scrollY: zoomState.scrollY + deltaY / nextZoom,
+          // 2x multiplier is just a magic number that makes this work correctly
+          // on touchscreen devices (note: if we get report that panning is slower/faster
+          // than actual movement, consider swapping with devicePixelRatio)
+          scrollX: zoomState.scrollX + 2 * (deltaX / nextZoom),
+          scrollY: zoomState.scrollY + 2 * (deltaY / nextZoom),
          shouldCacheIgnoreZoom: true,
        });
      });