def _compute_best_text_path(self):
text_path_a = TextPath(self._input_line_string, self._layout)
text_path_a.side = self._side
text_path_a.alignment = self._alignment
text_path_a.start_offset = self._start_offset
text_path_a.vertical_offset = self._vertical_offset
text_path_a.layout_engine_class = self._layout_engine_class
text_path_b = TextPath(self._input_line_string, self._layout)
text_path_b.side = self._side.flipped
text_path_b.alignment = self._alignment
text_path_b.start_offset = self._start_offset
text_path_b.vertical_offset = self._vertical_offset
text_path_b.layout_engine_class = self._layout_engine_class
baseline_a = text_path_a.compute_baseline()
baseline_b = text_path_b.compute_baseline()
ltr_length_a = line_string_helper.left_to_right_length(baseline_a)
ltr_length_b = line_string_helper.left_to_right_length(baseline_b)
if ltr_length_a > ltr_length_b:
self._text_path = text_path_a
else:
self._text_path = text_path_b
def test_compute_baseline(self):
surface, cairo_context = self._create_real_surface(
'compute_baseline.svg'
)
layout = pangocairocffi.create_layout(cairo_context)
layout.set_markup('<span font="8">Hi from Παν語</span>')
line_string = LineString([[0, 10], [50, 20], [100, 10]])
text_path = TextPath(line_string, layout)
text_path.alignment = Alignment.CENTER
text_path.draw(cairo_context)
baseline = text_path.compute_baseline()
debug.draw_line_string(cairo_context, baseline)
cairo_context.stroke()
assert isinstance(baseline, LineString)
assert baseline.length > 0
assert baseline.length < line_string.length
surface.finish()