[svgLib] Complete support for matrix transforms

Lib/fontTools/svgLib/path/__init__.py

@@ -55,7 +55,10 @@ class SVGPath(object):
         # xpath | doesn't seem to reliable work so just walk it
         for el in self.root.iter():
             pb.add_path_from_element(el)
+        original_pen = pen
         for path, transform in zip(pb.paths, pb.transforms):
-            # TODO use transform
+            if transform:
+                pen = TransformPen(original_pen, transform)
+            else:
+                pen = original_pen
             parse_path(path, pen)
-

Lib/fontTools/svgLib/path/shapes.py

@@ -19,6 +19,9 @@ def _strip_xml_ns(tag):
 
 
 def _transform(raw_value):
+    # TODO assumes a 'matrix' transform.
+    # No other transform functions are supported at the moment.
+    # https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/transform
     # start simple: if you aren't exactly matrix(...) then no love
     match = re.match(r'matrix\((.*)\)', raw_value)
     if not match:

Tests/svgLib/path/shapes_test.py

@@ -76,6 +76,12 @@ import pytest
             "M10.5,6.5 A1.5,1.5 0 1 1 13.5,6.5 A1.5,1.5 0 1 1 10.5,6.5",
             None
         ),
+        # circle, with transform
+        (
+            '<circle transform="matrix(0.9871 -0.1602 0.1602 0.9871 -7.525 8.6516)" cx="49.9" cy="51" r="14.3"/>',
+            'M35.6,51 A14.3,14.3 0 1 1 64.2,51 A14.3,14.3 0 1 1 35.6,51',
+            (0.9871, -0.1602, 0.1602, 0.9871, -7.525, 8.6516)
+        ),
         # ellipse
         (
             '<ellipse cx="100" cy="50" rx="100" ry="50"/>',
@@ -88,6 +94,12 @@ import pytest
             'M90.5,50 A10,50.5 0 1 1 110.5,50 A10,50.5 0 1 1 90.5,50',
             None
         ),
+        # ellipse, with transform
+        (
+            '<ellipse transform="matrix(0.9557 -0.2945 0.2945 0.9557 -14.7694 20.1454)" cx="59.5" cy="59.1" rx="30.9" ry="11.9"/>',
+            'M28.6,59.1 A30.9,11.9 0 1 1 90.4,59.1 A30.9,11.9 0 1 1 28.6,59.1',
+            (0.9557, -0.2945, 0.2945, 0.9557, -14.7694, 20.1454)
+        ),
     ]
 )
 def test_el_to_path(svg_xml, expected_path, expected_transform):