matplotlib
diff --git a/‎lib/matplotlib/backends/backend_agg.py
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+14-4Lines changed: 14 additions & 4 deletions b/‎lib/matplotlib/backends/backend_agg.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backends/backend_agg.py
+14-4Lines changed: 14 additions & 4 deletions
diff --git a/‎lib/matplotlib/tests/baseline_images/test_tightlayout/tight_layout1.png
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-22 Bytes b/‎lib/matplotlib/tests/baseline_images/test_tightlayout/tight_layout1.png
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-22 Bytes
@@ -197,10 +197,20 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
         xo, yo = font.get_bitmap_offset()
         xo /= 64.0
         yo /= 64.0
-        xd = d * sin(radians(angle))
-        yd = d * cos(radians(angle))
-        x = round(x + xo + xd)
-        y = round(y + yo + yd)
+
+        rad = radians(angle)
+        xd = d * sin(rad)
+        yd = d * cos(rad)
+        # Rotating the offset vector ensures text rotates around the anchor point.
+        # Without this, rotated text offsets incorrectly, causing a horizontal shift.
+        # Applying the 2D rotation matrix.
+        rotated_xo = xo * cos(rad) - yo * sin(rad)
+        rotated_yo = xo * sin(rad) + yo * cos(rad)
+        # Subtract rotated_yo to account for the inverted y-axis in computer graphics,
+        # compared to the mathematical convention.
+        x = round(x + rotated_xo + xd)
+        y = round(y - rotated_yo + yd)
+
         self._renderer.draw_text_image(font, x, y + 1, angle, gc)
 
     def get_text_width_height_descent(self, s, prop, ismath):