extend stimuli interface for start, duration, end metadata

stimuli/AbstractStimulus.py

@@ -6,3 +6,24 @@ class AbstractStimulus:
 
     def value_at_time_in_s(self, time_point):
         raise NotImplementedError("This is an abstract class!")
+
+    def get_stimulus_start_ms(self):
+        raise NotImplementedError("This is an abstract class!")
+
+    def get_stimulus_start_s(self):
+        return self.get_stimulus_start_ms() / 1000
+
+    def get_stimulus_duration_ms(self):
+        raise NotImplementedError("This is an abstract class!")
+
+    def get_stimulus_duration_s(self):
+        return self.get_stimulus_duration_ms() / 1000
+
+    def get_stimulus_end_ms(self):
+        return self.get_stimulus_start_ms() + self.get_stimulus_duration_ms()
+
+    def get_stimulus_end_s(self):
+        return self.get_stimulus_end_ms() / 1000
+
+    def get_amplitude(self):
+        raise NotImplementedError("This is an abstract class!")

stimuli/StepStimulus.py

@@ -21,3 +21,12 @@ class StepStimulus(AbstractStimulus):
             return self.value
         else:
             return self.base_value
+
+    def get_stimulus_start_ms(self):
+        return self.start
+
+    def get_stimulus_duration_ms(self):
+        return self.duration
+
+    def get_amplitude(self):
+        return self.value - self.base_value