From 83dce82604dd22b8b525c5624738167269808dc6 Mon Sep 17 00:00:00 2001
From: Mario Voigt <mariovoigt89@t-online.de>
Date: Sat, 1 Aug 2020 02:32:02 +0200
Subject: [PATCH] Added "Set View Box" extension

---
 extensions/fablabchemnitz_viewbox.inx | 16 +++++++
 extensions/fablabchemnitz_viewbox.py  | 68 +++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 extensions/fablabchemnitz_viewbox.inx
 create mode 100644 extensions/fablabchemnitz_viewbox.py

diff --git a/extensions/fablabchemnitz_viewbox.inx b/extensions/fablabchemnitz_viewbox.inx
new file mode 100644
index 00000000..b37c5d6e
--- /dev/null
+++ b/extensions/fablabchemnitz_viewbox.inx
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
+<_name>Set View Box</_name>
+<id>fablabchemnitz.de.setviewbox</id>
+<effect>
+	<object-type>rect</object-type>
+	<effects-menu>
+         <submenu _name="FabLab Chemnitz">
+            <submenu _name="Various" />
+         </submenu>
+	</effects-menu>
+</effect>
+<script>
+	<command reldir="extensions" interpreter="python">fablabchemnitz_viewbox.py</command>
+</script>
+</inkscape-extension>
\ No newline at end of file
diff --git a/extensions/fablabchemnitz_viewbox.py b/extensions/fablabchemnitz_viewbox.py
new file mode 100644
index 00000000..9e98fdd6
--- /dev/null
+++ b/extensions/fablabchemnitz_viewbox.py
@@ -0,0 +1,68 @@
+# Copyright (c) 2012 Stuart Pernsteiner
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+#    this list of conditions and the following disclaimer in the documentation
+#    and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
+# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import sys
+import inkex
+from inkex import Transform
+import gettext
+_ = gettext.gettext
+
+class SetViewBoxEffect(inkex.Effect):
+    def __init__(self):
+        inkex.Effect.__init__(self)
+
+    def effect(self):
+        if len(self.svg.selected) != 1:
+            sys.exit(_("Error: You must select exactly one rectangle"))
+
+        sel = None
+        for pathId in self.svg.selected:
+            sel = self.svg.selected[pathId]
+
+        mat = [[1,0,0],[0,1,0]]
+        cur = sel
+        while cur is not None:
+            curMat = Transform(cur.get('transform'))
+            mat = Transform(curMat) * Transform(mat)
+            cur = cur.getparent()
+
+        [x,y,w,h] = map(lambda attr: float(sel.get(attr)),
+                ['x','y','width','height'])
+    
+        (x1,y1) = transformPoint(mat, (x,y))
+        (x2,y2) = transformPoint(mat, (x+w,y+h))
+
+        ww = x2-x1
+        hh = y2-y1
+
+        root = self.svg.getElement('//svg:svg');
+        root.set('viewBox', '%f %f %f %f' % (x1,y1,ww,hh))
+        root.set('width', str(ww))
+        root.set('height', str(hh))
+
+def transformPoint(mat, pt):
+    pt2 = [pt[0], pt[1]]
+    Transform(mat).apply_to_point(pt2)
+    return (pt2[0], pt2[1])
+
+SetViewBoxEffect().run()
\ No newline at end of file