def _map_x_numbers_to_context(self, cairo_rectangle, data_rectangle, data):
"""\brief
\param cairo_rectangle - cairo rectangle
\param data_rectangle - \ref drawing_rectangle.drawing_rectangle instance
\param data - X coordinates in data context
"""
yy = data_rectangle.get_lower_y_limit() # common Y for all points to map
mapped = map_to_context_coordinates(data_rectangle, cairo_rectangle, map(lambda a: (a, yy), data))
return map(lambda a: a[0], mapped) # using just X
def _map_y_numbers_to_context(self, cairo_rect, data_rect, y_numbers):
"""\brief
\param cairo_rect - rectangle of cairo context
\param data_rect - rectangle of data
\param y_numbers - list of numbers
\return list of floats, y coordinates in cairo context
"""
xx = data_rect.get_upper_x_limit()
maped = map_to_context_coordinates(data_rect, cairo_rect, map(lambda a: (xx, a), y_numbers))
return map(lambda a: a[1], maped) # we do not use X - it is always 0
def draw(self, context, rect):
context.set_source_rgb(0.1, 0.5, 0)
drc = drawing_rectangle(lower_x_limit=-10,
upper_x_limit=10,
lower_y_limit=-1,
upper_y_limit=1)
sin_data = map(lambda a: (a, sin(a)), arange(-10, 10, 0.1))
mapsin = map_to_context_coordinates(drc, rect, sin_data)
context.move_to(mapsin[0][0], mapsin[0][1])
for dsin in mapsin[1:]:
context.line_to(*dsin)
context.stroke()
