added aspect racio governance and generator tags to trails SVGs

HISTORY.md

@@ -13,6 +13,7 @@
 * 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
+* objects: added aspect racio governance and generator tags to trails SVGs
 
 ## v5.3.8:
 * **Notable Change:**

src/objects.js

@@ -8953,19 +8953,13 @@ StageMorph.prototype.trailsLogAsSVG = function () { // +++
     });
     box = bottomLeft.corner(topRight).expandBy(maxWidth / 2);
     shift = new Point(-bottomLeft.x, topRight.y).translateBy(maxWidth / 2);
-    svg = '<svg ' +
+    svg = '<svg xmlns="http://www.w3.org/2000/svg" ' +
+        'preserveAspectRatio="none" ' +
         'viewBox="0 0 ' + box.width() + ' ' + box.height() + '" ' +
         'width="' + box.width() + '" height="' + box.height() + '" ' +
         // 'style="background-color:black" ' + // for supporting backgrounds
-        'xmlns="http://www.w3.org/2000/svg">';
-
-    // to do:
-    // * add source comment ("exported from Snap! etc."
-    // * add "keep aspect ratio" governance
-    // * catch / disable if the trails log is empty
-    // * catch if the trails contain non-vectorizable elements (stamp, fill)
-    // * decide how to handle background colors
-    // * consider a logging limit to prevent an overflowing queue
+        '>';
+    svg += '<!-- Generated by Snap! - http://snap.berkeley.edu/ -->';
 
     // for debugging the viewBox:
     // svg += '<rect width="100%" height="100%" fill="black"/>'