def print_text(ctx: cairo.Context, text, right=False, fd=default_font):
layout = pc.create_layout(ctx)
ctx.set_source_rgb(0, 0, 0)
layout.set_font_description(fd)
layout.set_text(text)
w, h = layout.get_pixel_size()
if right:
ctx.rel_move_to(-w, -h / 2)
else:
ctx.rel_move_to(0, -h / 2)
pc.show_layout(ctx, layout)
return (w, h)
def flap_cut_marks(ctx: cairo.Context, width: float, half_h: float,
mark_len: float) -> None:
cross(ctx, mark_len, ['down', 'right'])
ctx.rel_move_to(width, 0)
cross(ctx, mark_len, ['down', 'left'])
ctx.rel_move_to(0, 2 * half_h)
cross(ctx, mark_len, ['up', 'left'])
ctx.rel_move_to(-width, 0)
cross(ctx, mark_len, ['up', 'right'])
ctx.rel_move_to(0, -2 * half_h)
def cross(ctx: cairo.Context,
span: float,
tblr=['up', 'down', 'left', 'right']) -> None:
if 'up' in tblr:
ctx.rel_move_to(0, -span / 2)
ctx.rel_line_to(0, span / 2)
if 'down' in tblr:
ctx.rel_move_to(0, span / 2)
ctx.rel_line_to(0, -span / 2)
if 'left' in tblr:
ctx.rel_move_to(-span / 2, 0)
ctx.rel_line_to(span / 2, 0)
if 'right' in tblr:
ctx.rel_move_to(span / 2, 0)
ctx.rel_line_to(-span / 2, 0)
def draw(self, cr: cairo.Context) -> None:
vertex_pos = self._vertex_pos
if vertex_pos is None:
return
vertex_pos = self._parent._widget_coord_from_canvas(vertex_pos)
start_angle = -self._start_angle
delta_angle = -self._delta_angle
end_angle = start_angle + delta_angle
if not (math.isfinite(start_angle) and math.isfinite(end_angle)):
return
stroke_width = self._stroke_width
stroke_color = self._stroke_color
cr.set_line_width(stroke_width)
cr.set_source_rgb(*stroke_color)
# Start marker path
start_marker_radius = self._start_marker_radius
self._append_hand_path(cr, vertex_pos, start_angle,
start_marker_radius)
# End marker path
end_marker_radius = self._end_marker_radius
self._append_hand_path(cr, vertex_pos, end_angle, end_marker_radius)
cr.stroke()
# Angle arc path
angle_radius = self._angle_radius
if self._clockwise:
which_arc = cr.arc
else:
which_arc = cr.arc_negative
which_arc(*vertex_pos, angle_radius, start_angle, end_angle)
cr.stroke()
# Text
mid_angle = (start_angle + end_angle) / 2
text_radius = self._text_radius
text_font_size = self._text_font_size
cr.move_to(*vertex_pos)
cr.rel_move_to(text_radius * math.cos(mid_angle),
text_radius * math.sin(mid_angle))
cr.set_font_size(text_font_size)
cr.set_source_rgb(*stroke_color)
angle_text = '{:.1f}°'.format(math.degrees(abs(delta_angle)))
text_extents = cr.text_extents(angle_text)
cr.rel_move_to(-text_extents.x_bearing, -text_extents.y_bearing)
cr.rel_move_to(-text_extents.width / 2, -text_extents.height / 2)
cr.show_text(angle_text)
def draw(self, cr: cairo.Context) -> None:
start_angle = self._start_angle
delta_angle = self._delta_angle
clockwise = self._clockwise
arc_radius = self._arc_radius
start_line_radius = self._start_line_radius
end_line_radius = self._end_line_radius
x = self._x
y = self._y
stroke_color = self._stroke_color
stroke_width = self._stroke_width
text_radius = self._text_radius
font_size = self._font_size
text_color = self._text_color
scale_radii = self._scale_radii
scale_text = self._scale_text
scale_strokes = self._scale_strokes
if not (math.isfinite(start_angle) and math.isfinite(delta_angle)):
return
end_angle = start_angle + delta_angle
matrix = cr.get_matrix()
if scale_radii:
radius_scale = 1/(0.5 * (matrix.xx + matrix.yy))
else:
radius_scale = 1.0
self._show_hand(cr, x, y, -start_angle, radius_scale*start_line_radius)
self._show_hand(cr, x, y, -end_angle, radius_scale*end_line_radius)
if clockwise:
cr.arc(x, y, radius_scale*arc_radius, -start_angle, -end_angle)
else:
cr.arc_negative(x, y, radius_scale*arc_radius, -start_angle, -end_angle)
cr.save()
if scale_strokes:
cr.identity_matrix()
cr.set_source_rgba(*stroke_color)
cr.set_line_width(stroke_width)
cr.stroke()
cr.restore()
half_angle = (start_angle + end_angle) / 2
cr.move_to(x, y)
cr.rel_move_to(
radius_scale*text_radius * math.cos(half_angle),
radius_scale*text_radius * -math.sin(half_angle),
)
cr.save()
cr.set_source_rgba(*text_color)
cr.set_font_size(font_size)
if scale_text:
cr.identity_matrix()
text = '{:.1f}°'.format(math.degrees(math.fabs(delta_angle)))
text_extents = cr.text_extents(text)
cr.rel_move_to(-text_extents.x_bearing, -text_extents.y_bearing)
cr.rel_move_to(-text_extents.width/2, -text_extents.height/2)
cr.show_text(text)
cr.fill()
cr.restore()
def _show_aligned_text(self, ctx: cairo.Context, text, x, y):
extents = ctx.text_extents(text)
ctx.rel_move_to(x * extents.width, y * extents.height)
ctx.show_text(text)