VectorPaint: fixed rotation center editing for existing costumes

history.txt

@@ -4119,3 +4119,7 @@ in development:
 180604
 ------
 * Blocks: tweaked layout of variadic C-shaped input slots
+
+180605
+------
+* VectorPaint: fixed rotation center editing for existing costumes

objects.js

@@ -83,7 +83,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph, localize,
 TableMorph, TableFrameMorph, normalizeCanvas, BooleanSlotMorph, HandleMorph,
 AlignmentMorph, Process, XML_Element, VectorPaintEditorMorph*/
 
-modules.objects = '2018-May-02';
+modules.objects = '2018-June-05';
 
 var SpriteMorph;
 var StageMorph;
@@ -8472,12 +8472,8 @@ SVG_Costume.prototype.edit = function (
     editor.oncancel = oncancel || nop;
     editor.openIn(
         aWorld,
-        isnew ?
-        newCanvas(StageMorph.prototype.dimensions) :
-        this.contents,
-        isnew ?
-        new Point(240, 180) :
-        myself.rotationCenter,
+        isnew ? newCanvas(StageMorph.prototype.dimensions) : this.contents,
+        isnew ? new Point(240, 180) : myself.rotationCenter,
         function (img, rc, shapes) {
             myself.contents = img;
             myself.rotationCenter = rc;

vectorPaint.js

@@ -44,6 +44,10 @@
     -------
     Carles Paredes wrote the first working prototype in 2015
     Bernat Romagosa rewrote most of the code in 2017
+
+    revision history
+    ----------------
+    2018, June 5 - fixed initial rotation center for an existing costume (Jens)
 */
 
 /*global Point, Object, Rectangle, AlignmentMorph, Morph, XML_Element, nop,
@@ -51,7 +55,7 @@ PaintColorPickerMorph, Color, SliderMorph, InputFieldMorph, ToggleMorph,
 TextMorph, Image, newCanvas, PaintEditorMorph, StageMorph, Costume, isNil,
 localize, PaintCanvasMorph, detect, modules*/
 
-modules.vectorPaint = '2018-March-19';
+modules.vectorPaint = '2018-June-05';
 
 // Declarations
 
@@ -987,12 +991,11 @@ VectorPaintEditorMorph.prototype.buildScaleBox = function () {
 };
 
 VectorPaintEditorMorph.prototype.openIn = function (world, oldim, oldrc, callback, anIDE, shapes) {
-    var myself = this;
+    var myself = this,
+        isEmpty = isNil(shapes) || shapes.length === 0;
 
     VectorPaintEditorMorph.uber.openIn.call(this, world, null, oldrc, callback);
 
-    this.paper.automaticCrosshairs = isNil(shapes) || shapes.length === 0;
-
     this.shapes = shapes.map(function (eachShape) { return eachShape.copy(); });
     this.ide = anIDE;
 
@@ -1003,6 +1006,14 @@ VectorPaintEditorMorph.prototype.openIn = function (world, oldim, oldrc, callbac
         shape.drawOn(myself.paper);
     });
 
+    // init the rotation center, if any
+    if (oldrc && !isEmpty) {
+        this.paper.automaticCrosshairs = false;
+        this.paper.rotationCenter = this.getBounds(this.shapes).origin.subtract(this.paper.bounds.origin).add(oldrc);
+    } else {
+        this.paper.automaticCrosshairs = true;
+    }
+
     this.updateHistory();
 
     this.processKeyUp = function () {