Changelog for #2183

Fix closure for croppingPolygons in _drawTiles function

changelog.txt

@@ -7,6 +7,7 @@ OPENSEADRAGON CHANGELOG
 * You can now provide an element for the navigator (as an alternative to an ID) (#1303 @cameronbaney, #2166 #2175 @joedf)
 * Now supporting IIIF "id" and "identifier" in addition to "@id" (#2173 @ahankinson)
 * We now delegate tile fetching and caching to the TileSource, to allow for custom tile formats (#2148 @Aiosa)
+* Fixed: Cropping tiled images with polygons was broken (#2183 @altert)
 
 3.1.0:
 

src/tiledimage.js

@@ -1940,14 +1940,15 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
         }
 
         if (this._croppingPolygons) {
+            var self = this;
             this._drawer.saveContext(useSketch);
             try {
                 var polygons = this._croppingPolygons.map(function (polygon) {
                     return polygon.map(function (coord) {
-                        var point = this
+                        var point = self
                             .imageToViewportCoordinates(coord.x, coord.y, true)
-                            .rotate(-this.getRotation(true), this._getRotationPoint(true));
+                            .rotate(-self.getRotation(true), self._getRotationPoint(true));
-                        var clipPoint = this._drawer.viewportCoordToDrawerCoord(point);
+                        var clipPoint = self._drawer.viewportCoordToDrawerCoord(point);
                         if (sketchScale) {
                             clipPoint = clipPoint.times(sketchScale);
                         }