From 8b5eb9cb3e235d3c09d406a687bb22a74a0f124e Mon Sep 17 00:00:00 2001
From: Jonathan Neuhauser <jonathan.neuhauser@outlook.com>
Date: Mon, 14 Mar 2022 14:28:21 +0100
Subject: [PATCH] dxf12: base scale=mm

---
 dxf12_outlines.py                             |    5 +-
 .../dxf12_outlines__scale_not_unity__svg.out  |  272 +++
 .../data/refs/dxf12_outlines__shapes__svg.out | 1876 ++++-------------
 tests/data/svg/scale_not_unity.svg            |   65 +
 tests/test_dxf12_outlines.py                  |    1 +
 5 files changed, 806 insertions(+), 1413 deletions(-)
 create mode 100644 tests/data/refs/dxf12_outlines__scale_not_unity__svg.out
 create mode 100644 tests/data/svg/scale_not_unity.svg

diff --git a/dxf12_outlines.py b/dxf12_outlines.py
index 1b42b7f9..504a64d2 100755
--- a/dxf12_outlines.py
+++ b/dxf12_outlines.py
@@ -25,7 +25,9 @@
 from __future__ import absolute_import, print_function, unicode_literals
 
 import re
+
 import inkex
+import inkex.units
 from inkex.bezier import cspsubdiv
 
 r12_header = """ 0 
@@ -112,7 +114,8 @@ class DxfTwelve(inkex.OutputExtension):
         self.dxf_insert_code("999", '"DXF R12 Output" (www.mydxf.blogspot.com)')
         self.dxf_add(r12_header)
 
-        scale = 1  # TODO this assumes that one user unit corresponds to one mm
+        # Scale, but assume that the viewport is based on mm (dxf expects mm)
+        scale = self.svg.scale / inkex.units.convert_unit("1mm", "px")
         h = self.svg.viewbox_height
 
         path = "//svg:path"
diff --git a/tests/data/refs/dxf12_outlines__scale_not_unity__svg.out b/tests/data/refs/dxf12_outlines__scale_not_unity__svg.out
new file mode 100644
index 00000000..56a63605
--- /dev/null
+++ b/tests/data/refs/dxf12_outlines__scale_not_unity__svg.out
@@ -0,0 +1,272 @@
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\ No newline at end of file
diff --git a/tests/data/refs/dxf12_outlines__shapes__svg.out b/tests/data/refs/dxf12_outlines__shapes__svg.out
index b0c19868..dcf47fce 100644
--- a/tests/data/refs/dxf12_outlines__shapes__svg.out
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 ENDSEC
  0 
diff --git a/tests/data/svg/scale_not_unity.svg b/tests/data/svg/scale_not_unity.svg
new file mode 100644
index 00000000..2a4341ae
--- /dev/null
+++ b/tests/data/svg/scale_not_unity.svg
@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="210mm"
+   height="297mm"
+   viewBox="0 0 105 148.5"
+   version="1.1"
+   id="svg5"
+   inkscape:version="1.2-alpha1 (2e548ec3, 2022-02-27)"
+   sodipodi:docname="scale_not_unity.svg"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview7"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:pageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="mm"
+     showgrid="false"
+     inkscape:zoom="0.63118804"
+     inkscape:cx="598.07851"
+     inkscape:cy="617.88243"
+     inkscape:window-width="1920"
+     inkscape:window-height="1017"
+     inkscape:window-x="-8"
+     inkscape:window-y="353"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer1" />
+  <defs
+     id="defs2" />
+  <g
+     inkscape:label="Ebene 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <path
+       id="rect184"
+       style="stroke-width:0.306583"
+       d="m 29.341746,58.615201 h 50 v 35 h -50 z" />
+    <path
+       id="rect354"
+       style="stroke-width:0.221504"
+       d="M 0,0 H 25 V 40 H 0 Z" />
+    <path
+       id="rect356"
+       style="stroke-width:0.0746984"
+       d="M 95.000004,0 H 105 v 5 h -9.999996 z" />
+    <path
+       id="rect358"
+       style="stroke-width:0.11605"
+       d="m 0,133.5 h 7.5 v 15 H 0 Z"
+       inkscape:transform-center-x="2.2437042"
+       inkscape:transform-center-y="5.6347568" />
+    <path
+       style="fill:#000000;stroke-width:0.120649"
+       d="M 69.999999,113.5 105,122.87008 V 148.5 H 76.098484 Z"
+       id="path414" />
+  </g>
+</svg>
diff --git a/tests/test_dxf12_outlines.py b/tests/test_dxf12_outlines.py
index 507495fb..5c231c62 100644
--- a/tests/test_dxf12_outlines.py
+++ b/tests/test_dxf12_outlines.py
@@ -10,6 +10,7 @@ class TestDXF12OutlinesBasic(ComparisonMixin, TestCase):
         "svg/preserved-transforms.svg",
         "svg/dxf_nested_transforms.svg",
         "svg/clips_and_masks.svg",
+        "svg/scale_not_unity.svg",
     ]
     comparisons = [()]
     effect_class = DxfTwelve
-- 
GitLab