adjusted rotation center of SVG-pen-trails

HISTORY.md

@@ -12,6 +12,7 @@
 * new dev version
 * objects: export pen trails as SVG (under construction)
 * threads: new "pen trails (SVG)" reporter (experimental, hidden in dev)
+* objects, threads: adjusted rotation center of SVG-pen-trails
 
 ## v5.3.8:
 * **Notable Change:**

src/objects.js

@@ -5288,7 +5288,7 @@ SpriteMorph.prototype.floodFill = function () {
 
 // SpriteMorph pen trails as costume
 
-SpriteMorph.prototype.reportPenTrailsAsCostume = function () {
+SpriteMorph.prototype.reportPenTrailsAsCostume = function () { // +++
     var cst = new Costume(
         this.parentThatIsA(StageMorph).trailsCanvas,
         this.newCostumeName(localize('Costume'))
@@ -8927,7 +8927,7 @@ StageMorph.prototype.exportTrailsLogAsSVG = function () { // +++
     var ide = this.parentThatIsA(IDE_Morph);
 
     ide.saveFileAs(
-        this.trailsLogAsSVG(),
+        this.trailsLogAsSVG().src,
         'image/svg', // +++'image/svg+xml',
         ide.projectName || this.name
     );
@@ -8981,7 +8981,10 @@ StageMorph.prototype.trailsLogAsSVG = function () { // +++
             '" />';
     });
     svg += '</svg>';
-    return svg;
+    return {
+        src : svg,
+        rot : new Point(-box.origin.x, box.corner.y)
+    };
 };
 
 StageMorph.prototype.normalizePoint = function (snapPoint) { // +++

src/threads.js

@@ -5121,18 +5121,21 @@ Process.prototype.reportPentrailsAsSVG = function () { // +++
         svg = stage.trailsLogAsSVG();
         this.context.accumulator = {
             img : new Image(),
+            rot : svg.rot,
             ready : false
         };
         acc = this.context.accumulator;
         acc.img.onload = function () {
             acc.ready = true;
         };
-        acc.img.src = 'data:image/svg+xml,' + svg;
+        acc.img.src = 'data:image/svg+xml,' + svg.src;
+        acc.img.rot = svg.rotationShift;
     } else if (this.context.accumulator.ready) {
         this.returnValueToParentContext(
             new SVG_Costume(
                 this.context.accumulator.img,
-                this.blockReceiver().newCostumeName(localize('Costume'))
+                this.blockReceiver().newCostumeName(localize('Costume')),
+                this.context.accumulator.rot
             )
         );
         return;