def draw_component(self, g: Graphics, component: Canvas) -> None:
super().draw_component(g, component)
if component.image == Nothing:
return
image = component.image.unwrap()
padding = component.resolve_insets(StyleKeys.Padding).value_or(
Insets(0, 0, 0, 0)) + component.padding
(x, y, w, h) = component.bounds.tuple
bounds = Bounds(x + padding.left, y + padding.top,
max(w - padding.left - padding.right, 0),
max(h - padding.top - padding.bottom, 0))
(iw, ih) = image.size.tuple
(w, h) = bounds.size.tuple
if iw == 0 or ih == 0 or w == 0 or h == 0:
return
(x, y) = bounds.location.tuple
sw = w / iw
sh = h / ih
sx = x / sw
sy = y / sh
g.scale(sw, sh)
g.set_source_surface(image.surface, sx, sy)
g.paint()
def apply_viewbox(ctx: cairo.Context, width: float, height: float,
viewbox) -> float:
viewbox_width = viewbox[2]
viewbox_height = viewbox[3]
scale = min(width / viewbox_width, height / viewbox_height)
ctx.translate(-viewbox[0] * scale, -viewbox[1] * scale)
ctx.scale(scale, scale)
translate_x = (width / scale - viewbox_width) / 2
translate_y = (height / scale - viewbox_height) / 2
ctx.translate(translate_x, translate_y)
return scale
def draw(self, ctx: Context, surface: Surface):
ctx.save()
ctx.translate(self.translate_x, self.translate_y)
ctx.rotate(self.rotation)
ctx.scale(self.width / self.svg_width, self.height / self.svg_height)
ctx.translate(-self.origin_x, -self.origin_y)
CairoSVGSurface(self.tree,
None,
96,
output_cairo=surface,
output_cairo_context=ctx)
ctx.restore()
def draw(self, ctx: Context):
text_baseline = self.get_text_baseline(ctx)
default_font_max_height = ctx.get_scaled_font().extents()[0]
text_max_length = float('inf')
line_string_bottom_length = text_baseline.length
trimmed = False
while text_max_length > line_string_bottom_length:
text_max_length = ctx.text_extents(self.text)[4] / default_font_max_height * self.text_height + \
(len(self.text)-1) * self.text_spacing
if text_max_length > line_string_bottom_length:
self.text = self.text[:-1].strip()
trimmed = True
text_start_interp_pos_min = 0
text_start_interp_pos_max = line_string_bottom_length - text_max_length
if self.text_alignment == 'left':
text_start_interp_pos = self.text_alignment_offset
elif self.text_alignment == 'center':
text_start_interp_pos = line_string_bottom_length / 2 - text_max_length / 2 - self.text_alignment_offset
else:
text_start_interp_pos = line_string_bottom_length - text_max_length - self.text_alignment_offset
text_start_interp_pos = min(
text_start_interp_pos_max,
max(text_start_interp_pos_min, text_start_interp_pos))
text_interp_pos = text_start_interp_pos
for char in self.text:
char_pos_origin = text_baseline.interpolate(text_interp_pos)
char_advance_x = ctx.text_extents(
char)[4] / default_font_max_height * self.text_height
char_pos_end = text_baseline.interpolate(text_interp_pos +
char_advance_x)
ctx.save()
ctx.translate(char_pos_origin.x, char_pos_origin.y)
text_angle = math.atan2(char_pos_end.y - char_pos_origin.y,
char_pos_end.x - char_pos_origin.x)
ctx.rotate(text_angle)
ctx.scale(1 / default_font_max_height * self.text_height)
if not trimmed:
ctx.set_source_rgba(0, 0, 0, 1)
else:
ctx.set_source_rgba(0, 0, 0.2, 1)
ctx.show_text(char)
ctx.fill()
ctx.restore()
text_interp_pos += char_advance_x + self.text_spacing
def transform(
ctx: cairo.Context,
point: Tuple[float, float],
rotation: float = None,
scale_x=1.0,
scale_y=1.0,
):
ctx.translate(point[0], point[1])
if rotation is not None:
ctx.rotate(math.radians(rotation))
if scale_x != 1.0 or scale_y != 1.0:
ctx.scale(sx=scale_x, sy=scale_y)
ctx.translate(-point[0], -point[1])
def paint_foreground(self, ctx: Context):
if self._image:
sx = self.width / self._image.get_width()
sy = self.height / self._image.get_height()
s = min(sx, sy)
sw = self._image.get_width() * s
sh = self._image.get_height() * s
ctx.scale(s, s)
x = 0
y = 0
if self.alignment == Anchor.TOP_LEFT:
x = 0
y = 0
elif self.alignment == Anchor.TOP_CENTER:
x = (self.width - sw) / 2
y = 0
elif self.alignment == Anchor.TOP_RIGHT:
x = self.width - sw
y = 0
elif self.alignment == Anchor.CENTER_LEFT:
x = 0
y = (self.height - sh) / 2
elif self.alignment == Anchor.CENTER_CENTER:
x = (self.width - sw) / 2
y = (self.height - sh) / 2
elif self.alignment == Anchor.CENTER_RIGHT:
x = (self.width - sw)
y = (self.height - sh) / 2
elif self.alignment == Anchor.BOTTOM_LEFT:
x = 0
y = self.height - sh
elif self.alignment == Anchor.BOTTOM_CENTER:
x = (self.width - sw) / 2
y = self.height - sh
elif self.alignment == Anchor.BOTTOM_RIGHT:
x = self.width - sw
y = self.height - sh
x /= s
y /= s
ctx.set_source_surface(self._image, x, y)
ctx.paint()
else:
ctx.move_to(0, 0)
ctx.line_to(self.size.width, self.size.height)
ctx.stroke()
ctx.move_to(0, self.size.height)
ctx.line_to(self.size.width, 0)
ctx.stroke()
def _generate_layer(self, transcription, page, layer):
surface = PDFSurface(layer, *page.page_size)
context = Context(surface)
# context.select_font_face('Georgia')
context.set_source_rgba(1, 1, 1, 1 / 256) # almost invisible
context.set_font_size(2)
for line_ink, line_transcription in zip(page.lines, transcription):
ink, transformation = writing.normalized(line_ink)
context.save()
context.transform(
Matrix(*(Transformation.translation(
0, page.page_size[1]).parameter)))
context.transform(Matrix(*(Transformation.mirror(0).parameter)))
context.transform(Matrix(*((~transformation).parameter)))
context.transform(Matrix(*(Transformation.mirror(0).parameter)))
HANDWRITING_WIDTH = ink.boundary_box[1]
TYPEWRITING_WIDTH = context.text_extents(line_transcription)[2]
context.scale(HANDWRITING_WIDTH / TYPEWRITING_WIDTH, 1)
context.move_to(0, 0)
context.show_text(line_transcription)
context.restore()
context.stroke()
context.show_page()
surface.flush()
def _(d: Scaling, ctx: cairo.Context, scale: float):
ctx.save()
ctx.scale(d.x, d.y)
draw(d.child, ctx, scale)
ctx.restore()
def draw_text(ctx: Context, text: str, x: float, y: float, scale: float):
original = ctx.get_matrix()
ctx.translate(x, y)
ctx.scale(scale / 10) # Default font size is 10 mm (1cm)
ctx.show_text(text)
ctx.set_matrix(original)
def draw(self, ctx: Context, surface: Surface):
ctx.save()
ctx.translate(self.position_x, self.position_y)
ctx.scale(self.width / self.svg_width, self.height / self.svg_height)
CairoSVGSurface(self.tree, surface, ctx, 96)
ctx.restore()