Addin a multiply operator for GazePosition.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/argaze/GazeFeatures.py b/src/argaze/GazeFeatures.py
index d4307a2..218858a 100644
--- a/src/argaze/GazeFeatures.py
+++ b/src/argaze/GazeFeatures.py
@@ -26,6 +26,9 @@ import numpy
 import pandas
 import cv2
 
+GazePositionType = TypeVar('GazePosition', bound="GazePosition")
+# Type definition for type annotation convenience
+
 @dataclass(frozen=True)
 class GazePosition():
     """Define gaze position as a tuple of coordinates with precision."""
@@ -57,6 +60,11 @@ class GazePosition():
 
         return json.dumps(self, ensure_ascii = False, default=vars)
 
+    def __mul__(self, value) -> GazePositionType:
+        """Multiply gaze position."""
+
+        return GazePosition(numpy.array(self.value) * value, precision= self.precision * numpy.linalg.norm(value))
+
     def __array__(self):
         """Cast as numpy array."""