def test_identity(self):
assert CanvasUnit.from_pt(1).pt == 1
assert CanvasUnit.from_in(1).inches == 1
assert CanvasUnit.from_cm(1).cm == 1
assert CanvasUnit.from_mm(1).mm == 1
assert CanvasUnit.from_px(1).px == 1
assert CanvasUnit.from_pango(1).pango == 1
assert CanvasUnit.from_pt(2).pt == 2
assert CanvasUnit.from_in(2).inches == 2
assert CanvasUnit.from_cm(2).cm == 2
assert CanvasUnit.from_mm(2).mm == 2
assert CanvasUnit.from_px(2).px == 2
assert CanvasUnit.from_pango(2).pango == 2
def test_unit_scale(self):
surface_types = ['png', 'svg', 'pdf']
for surface_type in surface_types:
path = Path(__file__).parent\
.joinpath('output/canvas_builder_unit_scale.%s' % surface_type)
path.unlink(missing_ok=True)
canvas_builder = CanvasBuilder()
canvas_builder.set_path(path)
canvas_builder.set_size(CanvasUnit.from_in(1),
CanvasUnit.from_in(1))
canvas = canvas_builder.build()
UnitScale().draw(canvas)
canvas.close()
assert path.exists()
def close(self):
# Special edge case for ImageSurfaces
if isinstance(self.surface, cairo.ImageSurface):
self.surface.write_to_png(self.path_as_posix)
self.surface.finish()
# Cairo sets the dots-per-image as 72 pixels-per-inch, when it should
# be 96. We also want to take into account the scale, since the number
# of inches should not change. We use Pillow to adjust the DPI.
if isinstance(self.surface, cairo.ImageSurface):
image = Image.open(self.path_as_posix)
dpi = CanvasUnit.from_in(1).px * self.scale
image.save(self.path_as_posix, dpi=(dpi, dpi))
def test_comparisons(self):
assert CanvasUnit.from_in(1).pt > CanvasUnit.from_cm(1).pt
assert CanvasUnit.from_cm(1).pt > CanvasUnit.from_mm(1).pt
assert CanvasUnit.from_mm(1).pt > CanvasUnit.from_pt(1).pt
assert CanvasUnit.from_pt(1).pt > CanvasUnit.from_px(1).pt
assert CanvasUnit.from_px(1).pt > CanvasUnit.from_pango(1).pt
def from_in(cls, x: float, y: float) -> 'CanvasCoordinate':
return CanvasCoordinate(CanvasUnit.from_in(x), CanvasUnit.from_in(y))
def test_init(self):
bbox = CanvasBbox(Cc.from_in(1, 2), Cu.from_in(3), Cu.from_in(4))
assert bbox.pos == Cc.from_in(1, 2)
assert bbox.width == Cu.from_in(3)
assert bbox.height == Cu.from_in(4)