From fa44d293af0aefdb6eadc21544b70005eb10cf65 Mon Sep 17 00:00:00 2001
From: Antamansid <antamansid@yandex.ru>
Date: Wed, 29 Apr 2026 11:58:18 +0300
Subject: [PATCH] fix(camera): don't apply PAN_SPEED to pointer drag

---
 src/graphConfig.ts            | 8 ++++++--
 src/services/camera/Camera.ts | 9 ++++-----
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/graphConfig.ts b/src/graphConfig.ts
index 73dedfa7..6d62e8ec 100644
--- a/src/graphConfig.ts
+++ b/src/graphConfig.ts
@@ -220,8 +220,12 @@ export type TGraphConstants = {
      */
     PINCH_ZOOM_SPEED: number;
     /**
-     * Multiplier for camera pan speed applied to both mouse drag and trackpad swipe gestures.
-     * Does not affect auto-panning (see AUTO_PAN_SPEED) or zoom speed (see SPEED, PINCH_ZOOM_SPEED).
+     * Multiplier for camera pan speed applied to trackpad two-finger swipe (and
+     * mouse-wheel scroll when MOUSE_WHEEL_BEHAVIOR is "scroll"). Pointer drag
+     * (mouse drag and single-finger trackpad drag) tracks the cursor 1:1 and
+     * is not affected — applying a multiplier there would slide the canvas
+     * out from under the cursor. Does not affect auto-panning (see AUTO_PAN_SPEED)
+     * or zoom speed (see SPEED, PINCH_ZOOM_SPEED).
      *
      * @default 1
      */
diff --git a/src/services/camera/Camera.ts b/src/services/camera/Camera.ts
index 84b17c72..df445702 100644
--- a/src/services/camera/Camera.ts
+++ b/src/services/camera/Camera.ts
@@ -210,11 +210,10 @@ export class Camera extends EventedComponent<TCameraProps, TComponentState, TGra
     if (!this.lastDragEvent) {
       return;
     }
-    const panSpeed = this.context.constants.camera.PAN_SPEED;
-    this.camera.move(
-      (event.pageX - this.lastDragEvent.pageX) * panSpeed,
-      (event.pageY - this.lastDragEvent.pageY) * panSpeed
-    );
+    // No PAN_SPEED multiplier here: pointer drag tracks the cursor 1:1, otherwise
+    // the canvas slides out from under the pointer. PAN_SPEED only scales
+    // wheel-delta-driven trackpad swipes (see handleTrackpadMove).
+    this.camera.move(event.pageX - this.lastDragEvent.pageX, event.pageY - this.lastDragEvent.pageY);
     this.lastDragEvent = event;
   }