add parameter label to annotation functions

Author: DingWB

PyComplexHeatmap/annotations.py

@@ -68,10 +68,11 @@ def __init__(
 		legend=None,
 		legend_kws=None,
 		ylim=None,
+		label=None,
 		**plot_kws
 	):
 		self._check_df(df)
-		self.label = None
+		self.label = label
 		self.ylim = ylim
 		self.color_dict = None
 		self.nrows = self.df.shape[0]
@@ -111,7 +112,8 @@ def update_plot_kws(self, plot_kws):
 		self.plot_kws.update(plot_kws)
 
 	def set_label(self, label):
-		self.label = label
+		if self.label is None:
+			self.label = label
 
 	def set_legend(self, legend):
 		if self.legend is None: