From f155516a555e2be74841148eaa4b6d4b6a661c41 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Tue, 23 Nov 2010 16:12:34 +0000
Subject: added invisible block

---
diff --git a/TurtleArt/tasprite_factory.py b/TurtleArt/tasprite_factory.py
index 24622b5..0b8cf7c 100755
--- a/TurtleArt/tasprite_factory.py
+++ b/TurtleArt/tasprite_factory.py
@@ -122,10 +122,28 @@ class SVG:
             svg += self._show_dot()
         if self._hide is True:
             svg += self._hide_dot()
-
         svg += self.footer()
         return self.header() + svg
 
+    def invisible(self):
+        self.reset_min_max()
+        (x, y) = self._calculate_x_y()
+        self.margins[2] = 0
+        self.margins[3] = 0
+        # calculate shape but don't include it in the svg output
+        self.new_path(x, y)
+        self._corner(1, -1)
+        self._do_slot()
+        xx = self._x
+        self._corner(1, 1)
+        self._corner(-1, 1)
+        self._do_tab()
+        self._corner(-1, -1)
+        self.calc_w_h()
+        self._close_path()
+        self.style()
+        return self.header() + self.footer()
+
     def basic_flow(self):
         self.reset_min_max()
         (x, y) = self._calculate_x_y()
@@ -484,6 +502,8 @@ class SVG:
         svg += self._close_path()
         self.calc_w_h()
         svg += self.style()
+        if self._show is True:
+            svg += self._show_dot()
         svg += self.footer()
         return self.header() + svg
 
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