add rect support for applytransforms (2e4eabaceb)

extensions/fablabchemnitz/apply_transformations/apply_transformations.py

@@ -68,6 +68,47 @@ class ApplyTransformations(inkex.EffectExtension):
             except AttributeError as e:
                 pass
 
+    def transformRectangle(self, node, transf: Transform):
+        x = float(node.get('x', '0'))
+        y = float(node.get('y', '0'))
+        width = float(node.get('width', '0'))
+        height = float(node.get('height', '0'))
+        rx = float(node.get('rx', '0'))
+        ry = float(node.get('ry', '0'))
+
+        # Extract translation, scaling and rotation
+        a, b, c, d = transf.a, transf.b, transf.c, transf.d
+        tx, ty = transf.e, transf.f
+        sx = math.sqrt(a**2 + c**2)
+        sy = math.sqrt(b**2 + d**2)
+        angle = math.degrees(math.atan2(b, a))
+
+        # Calculate the center of the rectangle
+        cx = x + width / 2
+        cy = y + height / 2
+
+        # Apply the transformation to the center point
+        new_cx, new_cy = transf.apply_to_point((cx, cy))
+        new_x = new_cx - (width * sx) / 2
+        new_y = new_cy - (height * sy) / 2
+
+        # Update rectangle attributes
+        node.set('x', str(new_x))
+        node.set('y', str(new_y))
+        node.set('width', str(width * sx))
+        node.set('height', str(height * sy))
+
+        # Apply scale to rx and ry if they exist
+        if rx > 0:
+            node.set('rx', str(rx * sx))
+        if ry > 0:
+            node.set('ry', str(ry * sy))
+
+        # Add rotation if it exists
+        if abs(angle) > 1e-6:
+            tr = Transform(f"rotate({angle:.6f},{new_cx:.6f},{new_cy:.6f})")
+            node.set('transform',tr)
+
     def recursiveFuseTransform(self, element, transf=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]]):
 
         transf = Transform(transf) @ Transform(element.get("transform", None)) #a, b, c, d = linear transformations / e, f = translations
@@ -197,9 +238,14 @@ class ApplyTransformations(inkex.EffectExtension):
                 #self.recursiveFuseTransform(linkedObjectCopy, transf)
                 self.recursiveFuseTransform(element.unlink(), transf)
 
-        elif element.tag in [inkex.addNS('rect', 'svg'),
-                          inkex.addNS('text', 'svg'),
-                          inkex.addNS('image', 'svg')]:
+        elif element.tag == inkex.addNS('rect', 'svg'):
+            self.transformRectangle(element, transf)
+            self.scaleStrokeWidth(element, transf)
+
+        elif element.tag in [inkex.addNS('text', 'svg'),
+                          inkex.addNS('image', 'svg'),
+                          inkex.addNS('use', 'svg')]:
+
             element.attrib['transform'] = str(transf)
             inkex.utils.errormsg(f"Shape {element.TAG} ({element.get('id')}) not yet supported. Not all transforms will be applied. Try Object to path first")
         else: