set the rotation point of "pen trails" costumes to the position of the sprite that creates them

HISTORY.md

@@ -6,12 +6,14 @@
     * export pen trails as SVG
     * access pen trails as SVG_Costume: new "pen vectors" reporter variant of "pen trails"
 * **Notable Changes:**
+    * when creating a costume from pen trails (raster or vector) make its rotation center the position of the sprite
 * **Notable Fixes:**
 * **Translation Updates:**
     * German
 
 ### 2019-12-05
 * threads: set the rotation point of "pen vectors" costumes to the position of the sprite that creates them
+* objects: set the rotation point of "pen trails" costumes to the position of the sprite that creates them
 
 ### 2019-12-03
 * objects, blocks, threads, gui: added "log pen vectors" session setting

snap.html

@@ -8,7 +8,7 @@
         <script type="text/javascript" src="src/widgets.js?version=2019-10-16"></script>
         <script type="text/javascript" src="src/blocks.js?version=2019-12-03"></script>
         <script type="text/javascript" src="src/threads.js?version=2019-12-05"></script>
-        <script type="text/javascript" src="src/objects.js?version=2019-12-03"></script>
+        <script type="text/javascript" src="src/objects.js?version=2019-12-05"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-12-03"></script>
         <script type="text/javascript" src="src/paint.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/lists.js?version=2019-11-15"></script>

src/objects.js

@@ -84,7 +84,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph,  BooleanSlotMorph,
 localize, TableMorph, TableFrameMorph, normalizeCanvas, VectorPaintEditorMorph,
 HandleMorph, AlignmentMorph, Process, XML_Element, WorldMap, copyCanvas*/
 
-modules.objects = '2019-December-03';
+modules.objects = '2019-December-05';
 
 var SpriteMorph;
 var StageMorph;
@@ -5299,6 +5299,9 @@ SpriteMorph.prototype.reportPenTrailsAsCostume = function () {
         this.newCostumeName(localize('Costume'))
     );
     cst.shrinkWrap();
+    cst.rotationCenter = cst.rotationCenter.translateBy(
+        new Point(this.xPosition(), -this.yPosition())
+    );
     return cst;
 };