def _repaint(self, drawing_context: DrawingContext.DrawingContext) -> None:
"""Repaint the canvas item. This will occur on a thread."""
canvas_size = self.canvas_size
if canvas_size:
# draw background
if self.background_color:
with drawing_context.saver():
drawing_context.begin_path()
drawing_context.move_to(0, 0)
drawing_context.line_to(canvas_size.width, 0)
drawing_context.line_to(canvas_size.width, canvas_size.height)
drawing_context.line_to(0, canvas_size.height)
drawing_context.close_path()
drawing_context.fill_style = self.background_color
drawing_context.fill()
# draw the data, if any
if (self.data is not None and len(self.data) > 0):
# draw the histogram itself
with drawing_context.saver():
drawing_context.begin_path()
binned_data = Image.rebin_1d(self.data, int(canvas_size.width), self.__retained_rebin_1d) if int(canvas_size.width) != self.data.shape[0] else self.data
for i in range(canvas_size.width):
drawing_context.move_to(i, canvas_size.height)
drawing_context.line_to(i, canvas_size.height * (1 - binned_data[i]))
drawing_context.line_width = 1
drawing_context.stroke_style = "#444"
drawing_context.stroke()