animator: add fade event for SVG images

svganimator/SvgUtils.py

@@ -31,6 +31,7 @@ def filter_tag(root: ET.Element, tag):
 path_tag = svg_namespace + 'path'
 rectangle_tag = svg_namespace + 'rect'
 svg_tag = svg_namespace + 'svg'
+image_tag = svg_namespace + 'use'
 
 
 def svg_elements_named(name: str, root: ET.Element):
@@ -44,6 +45,12 @@ def is_circle(root: ET.Element):
     return root.tag == circle_tag
 
 
+def is_image(root: ET.Element):
+    """Returns true if root is an image use."""
+
+    return root.tag == image_tag
+
+
 def is_group(root: ET.Element):
     """Returns true if root is an SVG group."""
 

svganimator/SvgVisitors.py

@@ -58,6 +58,8 @@ def visit_root(self, node: ET.ElementTree):
     def _visit(self, node: ET.ElementTree):
         if SvgUtils.is_circle(node):
             return self._visit_circle(node)
+        if SvgUtils.is_image(node):
+            return self._visit_image(node)
         if SvgUtils.is_path(node):
             return self._visit_path(node)
         if SvgUtils.is_group(node):
@@ -72,6 +74,9 @@ def _visit(self, node: ET.ElementTree):
     def _visit_circle(self, node: ET.ElementTree):
         return FadeEvent(node, self.out, 1)
 
+    def _visit_image(self, node: ET.ElementTree):
+        return FadeEvent(node, self.out, 600)
+
     def _visit_path(self, node: ET.ElementTree):
         return PathEvent(node, self.out)
 

tests/test_SvgVisitors.py

@@ -2,6 +2,7 @@
 from svganimator.ParallelEventContainer import ParallelEventContainer
 from svganimator.PathEvent import PathEvent
 from svganimator.SequentialEventContainer import SequentialEventContainer
+from svganimator.FadeEvent import FadeEvent
 from svganimator.SvgVisitors import SimpleVisitor
 import io
 import unittest
@@ -89,13 +90,14 @@ def test_flat_root(self):
             y="20.0"
             width="20.0"
             height="20.0"/>
+      <use id="use46"/>
       </svg>''')
 
     def test_grouped_root(self):
         out = io.StringIO()
         visitor = SimpleVisitor(out)
         events = visitor.visit_root(TestSimpleVisitor.nested_root)
-        self.assertEqual(len(events), 3)
+        self.assertEqual(len(events), 4)
 
         cam_event = events[0]
         self.assertIsInstance(cam_event, CameraEvent)
@@ -122,6 +124,9 @@ def test_grouped_root(self):
         self.assertEqual(cam_event2.old_cam, [10.0, 20.0, 30.0, 40.0])
         self.assertEqual(cam_event2.new_cam, [20.0, 20.0, 20.0, 20.0])
 
+        image_event = events[3]
+        self.assertIsInstance(image_event, FadeEvent)
+
 
 if __name__ == '__main__':
     unittest.main()