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_draw(self):
surface, cairo_context = self._create_real_surface('draw.svg')
layout = pangocairocffi.create_layout(cairo_context)
layout.set_markup('Hi from Παν語')
line_string = LineString([[10, 30], [90, 30]])
text_path = TextPath(line_string, layout)
text_path.draw(cairo_context)
debug.draw_line_string(cairo_context, line_string)
cairo_context.stroke()
line_string = LineString([[10, 50], [50, 50], [90, 90]])
text_path = TextPath(line_string, layout)
text_path.draw(cairo_context)
debug.draw_line_string(cairo_context, line_string)
cairo_context.stroke()
surface.finish()
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()
def test_side(self):
surface, cairo_context = self._create_real_surface('side.svg')
layout = pangocairocffi.create_layout(cairo_context)
layout.set_markup('Hi from Παν語')
line_string = LineString([[10, 30], [50, 30], [90, 70]])
text_path = TextPath(line_string, layout)
text_path.draw(cairo_context)
debug.draw_line_string(cairo_context, line_string)
cairo_context.stroke()
line_string = translate(line_string, 0, 20)
text_path = TextPath(line_string, layout)
text_path.side = Side.RIGHT
text_path.draw(cairo_context)
debug.draw_line_string(cairo_context, line_string)
cairo_context.stroke()
surface.finish()
def test_alignment(self):
surface, cairo_context = self._create_real_surface(
'alignment.svg',
300,
100
)
layout = pangocairocffi.create_layout(cairo_context)
layout.set_markup('<span font="8">Hi from Παν語</span>')
start_offsets = [-10, 0, 10]
alignments = [Alignment.LEFT, Alignment.CENTER, Alignment.RIGHT]
for start_offset_index, start_offset in enumerate(start_offsets):
for alignment_index, alignment in enumerate(alignments):
line_string = LineString([
[5, 33 + alignment_index * 20],
[30, 23 + alignment_index * 20],
[50, 20 + alignment_index * 20],
[70, 23 + alignment_index * 20],
[95, 33 + alignment_index * 20]
])
line_string = translate(
line_string,
start_offset_index * 100,
0
)
text_path = TextPath(line_string, layout)
text_path.alignment = alignment
text_path.start_offset = start_offset
cairo_context.set_source_rgb(0, 0, 0)
text_path.draw(cairo_context)
cairo_context.set_source_rgba(0, 0, 0, 0.2)
debug.draw_line_string(cairo_context, line_string)
cairo_context.stroke()
surface.finish()
def test_alignment_when_no_space(self):
surface, cairo_context = self._create_real_surface(
'alignment_with_no_space.svg'
)
layout = pangocairocffi.create_layout(cairo_context)
layout.set_markup('Hi from Παν語')
line_string = LineString([[10, 30], [90, 30]])
text_path = TextPath(line_string, layout)
text_path.alignment = Alignment.CENTER
text_path.draw(cairo_context)
debug.draw_line_string(cairo_context, line_string)
cairo_context.stroke()
line_string = translate(line_string, 0, 25)
text_path = TextPath(line_string, layout)
text_path.alignment = Alignment.RIGHT
text_path.draw(cairo_context)
debug.draw_line_string(cairo_context, line_string)
cairo_context.stroke()
surface.finish()