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_vertical_offset_works(self):
surface, cairo_context = self._create_real_surface(
'vertical_offset_works.svg'
)
layout = pangocairocffi.create_layout(cairo_context)
layout.set_markup('Hi from Παν語')
line_string = LineString([[5, 40], [45, 40], [90, 80]])
for vertical_offset in [-13, 0, 13]:
offset_linestring, _ = parallel_offset_with_matching_direction(
line_string,
vertical_offset,
side=Side.LEFT
)
debug.draw_line_string(cairo_context, offset_linestring)
red = max(0.0, vertical_offset / 13)
green = max(0.0, -vertical_offset / 13)
cairo_context.set_source_rgba(red, green, 0, 0.2)
cairo_context.stroke()
text_path = TextPath(line_string, layout)
text_path.vertical_offset = vertical_offset
cairo_context.set_source_rgb(red, green, 0)
text_path.draw(cairo_context)
surface.finish()
def test_vertical_offset_fails_on_invalid_offset_shape(self):
surface, cairo_context = self._create_void_surface()
layout = pangocairocffi.create_layout(cairo_context)
layout.set_markup('Hi from Παν語')
line_string = LineString([[0, 0], [40, 0], [40, 40], [0, 40], [0, 0]])
text_path = TextPath(line_string, layout)
text_path.vertical_offset = -10
with self.assertRaises(RuntimeError):
text_path.draw(cairo_context)
def test_setters_getters(self):
surface, cairo_context = self._create_void_surface()
layout = pangocairocffi.create_layout(cairo_context)
layout.set_markup('Hi from Παν語')
line_string = LineString([[0, 0], [600, 0]])
text_path = TextPath(line_string, layout)
assert isinstance(text_path.side, Side)
assert isinstance(text_path.alignment, Alignment)
assert isinstance(text_path.start_offset, float)
assert isinstance(text_path.vertical_offset, float)
text_path.side = Side.RIGHT
text_path.alignment = Alignment.RIGHT
text_path.start_offset = 12
text_path.vertical_offset = 34
assert isinstance(text_path.side, Side)
assert isinstance(text_path.alignment, Alignment)
assert isinstance(text_path.start_offset, float)
assert isinstance(text_path.vertical_offset, float)
text_path.layout_engine_class = Svg