Calculate mouse movement delta depending on pointer lock

Author: ksen0

src/events/mouse.js

@@ -810,13 +810,23 @@ p5.prototype._updateNextMouseCoords = function(e) {
       e
     );
 
-    this._setProperty('movedX', e.movementX);
-    this._setProperty('movedY', e.movementY);
+
     this._setProperty('mouseX', mousePos.x);
     this._setProperty('mouseY', mousePos.y);
     this._setProperty('winMouseX', mousePos.winX);
     this._setProperty('winMouseY', mousePos.winY);
 
+    if (document.pointerLockElement === canvas) {
+      this._setProperty('movedX', e.movementX);
+      this._setProperty('movedY', e.movementY);
+    }
+
+    else {
+      const deltaX = this.mouseX - this.pmouseX;
+      const deltaY = this.mouseY - this.pmouseY;
+      this._setProperty('movedX', deltaX);
+      this._setProperty('movedY', deltaY);
+    }
   }
 
   if (!this._hasMouseInteracted) {