def curve_func(step):
subcurve_idx = step // nr_sides
side_idx = step % nr_sides
# distance from centre of polygons to centre of one side of outermost polygon =
# radius * math.sin(corner_angle / 2)
# therefore, distance from centre of polygons to corner of next-inner polygon =
# radius * step_scale_factor
# such that
# step_scale_factor = math.sin(corner_angle / 2) / math.cos(math.pi / nr_sides - abs(step_rotate))
# where
# step_rotate = math.pi / nr_sides * poly_shrink
step_rotate = math.pi / nr_sides * poly_shrink
corner_angle = (0.5 - 1 / nr_sides) * qah.circle
step_scale_factor = math.sin(
corner_angle / 2) / math.cos(math.pi / nr_sides - abs(step_rotate))
scale = step_scale_factor**subcurve_idx
rotate = \
(
phase
+
step_rotate * subcurve_idx
+
qah.circle / nr_sides * side_idx
)
return \
qah.Vector(radius * scale, 0).rotate(rotate)
def draw(self, cr, pos):
self.strip()
for drawColorLayers in (False, True):
p = qh.Vector(pos.x, pos.y)
for box in self.boxes:
p.x = box.draw(cr, p, drawColorLayers)
def curve_func(n):
subcurve = n // mod // k
step = n * delta % mod
phi = qah.circle * (step + subcurve) / mod
theta = qah.circle * ((step + subcurve) * freq / mod + phase)
r = offset + math.sin(theta) * amplitude
return \
qah.Vector(r * math.cos(phi), r * math.sin(phi))
def get_page_number_pos(self, page, width):
pos = qh.Vector(0, self.page_number_ypos)
# Center the number relative to the text box.
line = self.lines_per_page - 1
text_width = self.get_text_width(line)
pos.x = self.get_text_start_pos(page, line)
pos.x -= text_width / 2
# Center the box around the position
pos.x -= width / 2
return pos
def draw(self, cr):
logger.info("Page %d…", self.number)
shaper = self.doc.shaper
self.cr = cr
if not self.lines:
logger.debug("Leaving empty page blank")
cr.show_page()
return
self.strip()
lines = self.lines
pos = qh.Vector(0, self.doc.top_margin)
for i, line in enumerate(lines):
pos.x = self.doc.get_text_start_pos(self, i)
text_width = self.doc.get_text_width(i)
line.draw(cr, pos, text_width)
if line.get_quarter() or line.get_prostration():
self._show_quarter(line, line.get_quarter(),
line.get_prostration(), pos.y)
pos.y += line.height
# Show page number.
box = shaper.shape_word(format_number(self.number))
pos = self.doc.get_page_number_pos(self, box.width)
box.draw(cr, pos)
# Draw page decorations.
if self.doc.page_decorations:
o = 8
x = self.doc.get_text_start_pos(self, 0) + o
y = self.doc.top_margin - self.doc.leading / 2 - o
w = self.doc.get_text_width(0) + o * 2
h = self.doc.leading * self.doc.lines_per_page + o
cr.save()
rect = qh.Rect(x - w, y, w, h)
cr.rectangle(rect)
cr.set_line_width(1)
cr.stroke()
cr.rectangle(rect.inset((-5, -5)))
cr.set_line_width(3)
cr.stroke()
cr.restore()
cr.show_page()
def draw(self, cr, pos, width):
offset = self.doc.leading / 2
height = self.height - offset
linepos = qh.Vector(pos.x, pos.y)
for line in self.boxes:
line.draw(cr, linepos, width)
linepos.x = pos.x
linepos.y += line.height - offset / 1.2
cr.save()
cr.set_line_width(0.5)
cr.move_to((pos.x, pos.y - offset))
cr.rectangle(qh.Rect(pos.x - width, pos.y - offset, width, height))
cr.stroke()
cr.restore()
def draw(self, cr):
logger.info("Page %d…", self.number)
shaper = self.doc.shaper
self.cr = cr
if not self.lines:
logger.debug("Leaving empty page blank")
cr.show_page()
return
lines = self.lines
pos = qh.Vector(self.doc.text_start_pos, self.doc.top_margin)
for i, line in enumerate(lines):
line.draw(cr, pos)
pos.y += line.height
cr.show_page()
def shape_verse(self, verse, mark=None):
"""
Shapes a single verse and returns the corresponding nodes.
"""
buf = self.shape(verse, hb.HARFBUZZ.DIRECTION_RTL)
nodes = []
infos = buf.glyph_infos
positions = buf.glyph_positions
flip = qh.Vector(1, -1)
i = len(infos) - 1
while i >= 0:
# Find all indices with same cluster
j = i
while j >= 0 and infos[i].cluster == infos[j].cluster:
j -= 1
# Collect all glyphs in this cluster, iterating backwards to get
# glyphs in the visual order.
pos = qh.Vector(0, 0)
glyphs = []
for k in reversed(range(i, j, -1)):
glyphs.append(
qh.Glyph(infos[k].codepoint,
pos + flip * positions[k].offset))
pos += flip * positions[k].advance
# The chars in this cluster
chars = verse[infos[i].cluster:infos[j].cluster]
# We skip space since the font kerns with it and we will turn these
# kerns into glue below.
if chars != " ":
# Find the last non-combining mark char in the string, to check
# for joining behaviour.
for ch in chars:
if not unicodedata.combining(ch):
base = ch
adv = self.font.get_glyph_h_advance(glyphs[-1].index)
minadv = self.minfont.get_glyph_h_advance(glyphs[-1].index)
maxadv = self.maxfont.get_glyph_h_advance(glyphs[-1].index)
shrink = adv - minadv
stretch = maxadv - adv
if base in RIGH_JOINING or self.next_is_nonjoining(
verse, infos, j):
# Get the difference between the original advance width and
# the advance width after OTL.
kern = positions[k].advance - qh.Vector(adv, 0)
# Re-adjust glyph positions.
glyphs = [qh.Glyph(g.index, g.pos - kern) for g in glyphs]
nodes.append(
Box(self.doc, chars, glyphs, adv, stretch, shrink))
# Add glue with the kerning amount with minimal stretch and shrink.
nodes.append(
Glue(self.doc, kern.x, kern.x / 8.5, kern.x / 8.5))
else:
nodes.append(
Box(self.doc, chars, glyphs, pos.x, stretch, shrink))
elif pos.x != 0:
# If space is not zero-width, add glue for it.
nodes.append(Glue(self.doc, pos.x, pos.x / 8.5, pos.x / 8.5))
i = j
if mark:
buf = self.shape(mark, hb.HARFBUZZ.DIRECTION_LTR)
glyphs, pos = buf.get_glyphs()
nodes.append(Box(self.doc, mark, glyphs, pos.x))
return nodes