diff --git a/README.md b/README.md
index 1d6c966..46b5cc6 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,9 @@
 Inkscape extension: isometric projection converter
 ==================================================
 
+*This version of the extension is for Inkscape 1.0 or later. For older versions of
+Inkscape, please use [v1.2](../../tree/v1.2).*
+
 This [Inkscape](https://inkscape.org) extension transforms objects drawn on a
 two-dimensional plane to an isometric projection.
 
diff --git a/isometric_projection.inx b/isometric_projection.inx
index 599279a..926dc3e 100644
--- a/isometric_projection.inx
+++ b/isometric_projection.inx
@@ -1,15 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
-  <_name>Isometric Projection</_name>
+  <name>Isometric Projection</name>
   <id>nl.jeroenhoek.inkscape.filter.isometric_projection_tool</id>
   <dependency type="executable" location="extensions">isometric_projection.py</dependency>
-  <dependency type="executable" location="extensions">inkex.py</dependency>
   <param name="conversion" type="optiongroup" gui-text="Convert flat projection to">
     <option value="top">Isometric top side</option>
     <option value="left">Isometric left-hand side</option>
     <option value="right">Isometric right-hand side</option>
   </param>
-  <param name="reverse" type="boolean" gui-text="Reverse transformation">false</param>
+  <param name="reverse" type="bool" gui-text="Reverse transformation">false</param>
   <effect>
     <object-type>all</object-type>
     <effects-menu>
diff --git a/isometric_projection.py b/isometric_projection.py
index 0b61206..3385bce 100644
--- a/isometric_projection.py
+++ b/isometric_projection.py
@@ -4,11 +4,10 @@
 import math
 import sys
 import inkex
-from simpletransform import parseTransform, formatTransform
-from simpletransform import computeBBox, applyTransformToPoint
+from simpletransform import Transform
 
 sys.path.append('/usr/share/inkscape/extensions')
-inkex.localize()
+inkex.localization.localize()
 
 
 class IsometricProjectionTools(inkex.Effect):
@@ -75,12 +74,12 @@ def __init__(self):
 
         inkex.Effect.__init__(self)
 
-        self.OptionParser.add_option(
-            '-c', '--conversion', action='store', type='string',
+        self.arg_parser.add_argument(
+            '-c', '--conversion',
             dest='conversion', default='top',
             help='Conversion to perform: (top|left|right)')
-        self.OptionParser.add_option(
-            '-r', '--reverse', action='store', type='string',
+        self.arg_parser.add_argument(
+            '-r', '--reverse',
             dest='reverse', default="false",
             help='Reverse the transformation from isometric projection ' +
             'to flat 2D')
@@ -121,15 +120,14 @@ def getMidPoint(self, bbox, node):
 
         return [x, y]
 
-    def translateBetweenPoints(self, matrix, here, there):
+    def translateBetweenPoints(self, tr, here, there):
         """
         Add a translation to a matrix that moves between two points.
         """
 
         x = there[0] - here[0]
         y = there[1] - here[1]
-        matrix[0][2] += x
-        matrix[1][2] += y
+        tr.add_translate(x, y)
 
     def moveTransformationCenter(self, node, midpoint, center_new):
         """
@@ -159,7 +157,7 @@ def effect(self):
         else:
             conversion = "to_" + self.options.conversion
 
-        if len(self.selected) == 0:
+        if len(self.svg.selected) == 0:
             inkex.errormsg(_("Please select an object to perform the " +
                              "isometric projection transformation on."))
             return
@@ -169,30 +167,31 @@ def effect(self):
         effect_matrix = self.transformations.get(
             conversion, self.transformations.get('to_top'))
 
-        for id, node in self.selected.items():
-            bbox = computeBBox([node])
+        for id, node in self.svg.selected.items():
+            bbox = node.bounding_box()
             midpoint = self.getMidPoint(bbox, node)
             center_old = self.getTransformCenter(midpoint, node)
             transform = node.get("transform")
             # Combine our transformation matrix with any pre-existing
             # transform.
-            matrix = parseTransform(transform, effect_matrix)
+            tr = Transform(transform) * Transform(effect_matrix)
 
             # Compute the location of the transformation center after applying
             # the transformation matrix.
             center_new = center_old[:]
-            applyTransformToPoint(matrix, center_new)
-            applyTransformToPoint(matrix, midpoint)
+            #Transform(matrix).apply_to_point(center_new)
+            tr.apply_to_point(center_new)
+            tr.apply_to_point(midpoint)
 
             # Add a translation transformation that will move the object to
             # keep its transformation center in the same place.
-            self.translateBetweenPoints(matrix, center_new, center_old)
+            self.translateBetweenPoints(tr, center_new, center_old)
 
-            node.set('transform', formatTransform(matrix))
+            node.set('transform', str(tr))
 
             # Adjust the transformation center.
             self.moveTransformationCenter(node, midpoint, center_new)
 
 # Create effect instance and apply it.
 effect = IsometricProjectionTools()
-effect.affect()
+effect.run()