CUT_DEPTH = 1.95 * POINTS_PER_CM
CUT_WIDTH = 1.05 * POINTS_PER_CM
MIDDLE_POINT_DEPTH = 0.4 * POINTS_PER_CM
-SPINE_LIMIT = 1 * POINTS_PER_CM
+INNER_SPINE_MARGIN_PER_PAGE = 1 * POINTS_PER_CM
QUARTER_SCALE_FACTOR = 0.5
PAGE_ORDER_FOR_NUP4 = (3,0,7,4,1,2,5,6)
-# some helpers
-PageCrop = namedtuple("PageCrop", ["left", "bottom", "right", "top"], defaults=[0,0,0,0])
+
+class PageCrop:
+
+ def __init__(self, left_cm=0, bottom_cm=0, right_cm=0, top_cm=0):
+ self.left_cm = left_cm
+ self.bottom_cm = bottom_cm
+ self.right_cm = right_cm
+ self.top_cm = top_cm
+ self.left = float(self.left_cm) * POINTS_PER_CM
+ self.bottom = float(self.bottom_cm) * POINTS_PER_CM
+ self.right = float(self.right_cm) * POINTS_PER_CM
+ self.top = float(self.top_cm) * POINTS_PER_CM
+ zoom_horizontal = A4_WIDTH / (A4_WIDTH - self.left - self.right)
+ zoom_vertical = A4_HEIGHT / (A4_HEIGHT - self.bottom - self.top)
+ if (zoom_horizontal > 1 and zoom_vertical < 1) or (zoom_horizontal < 1 and zoom_vertical > 1):
+ raise HandledException("-c: crops would create opposing zoom directions")
+ elif zoom_horizontal + zoom_vertical > 2:
+ self.zoom = min(zoom_horizontal, zoom_vertical)
+ else:
+ self.zoom = max(zoom_horizontal, zoom_vertical)
+
+ def __str__(self):
+ return str(vars(self))
+
+ @property
+ def format_in_cm(self):
+ return f"left {self.left_cm}cm, bottom {self.bottom_cm}cm, right {self.right_cm}cm, top {self.top_cm}cm"
+
+ @property
+ def remaining_width(self):
+ return A4_WIDTH - self.left - self.right
+
+ @property
+ def remaining_height(self):
+ return A4_HEIGHT - self.bottom - self.top
+
+ def give_mirror(self):
+ return PageCrop(left_cm=self.right_cm, bottom_cm=self.bottom_cm, right_cm=self.left_cm, top_cm=self.top_cm)
+
+
+class Nup4Geometry:
+
+ def __init__(self, margin_cm):
+ self.margin = margin_cm * POINTS_PER_CM
+ self.shrink_for_margin = (A4_WIDTH - 2 * self.margin)/A4_WIDTH
+ # NB: We define spine size un-shrunk, but .shrink_for_spine is used with values shrunk for the margin, which we undo here.
+ spine_part_of_page = (INNER_SPINE_MARGIN_PER_PAGE / A4_HALF_WIDTH) / self.shrink_for_margin
+ self.shrink_for_spine = 1 - spine_part_of_page
+
class HandledException(Exception):
pass
+
def parse_args():
parser = argparse.ArgumentParser(description=__doc__, epilog=help_epilogue, formatter_class=argparse.RawDescriptionHelpFormatter)
parser.add_argument("-i", "--input_file", action="append", required=True, help="input PDF file")
parser.add_argument("-m", "--print_margin", type=float, default=0.43, help="print margin for --nup4 in cm (default 0.43)")
return parser.parse_args()
+
def validate_inputs_first_pass(args):
for filename in args.input_file:
if not os.path.isfile(filename):
except ValueError:
raise HandledException(f"-m: non-float value: {arg.print_margin}")
+
def validate_page_range(p_string, err_msg_prefix):
prefix = f"{err_msg_prefix}: page range string"
if '-' not in p_string:
if start > 0 and end > 0 and start > end:
raise HandledException(f"{prefix} has higher start than end value: {p_string}")
+
def split_crops_string(c_string):
initial_split = c_string.split(':')
if len(initial_split) > 1:
crops = initial_split[0]
return page_range, crops
+
def parse_page_range(range_string, pages):
start_page = 0
end_page = len(pages)
end_page = int(end)
return start_page, end_page
+
def read_inputs_to_pagelist(args_input_file, args_page_range):
pages_to_add = []
opened_files = []
print(f"-i, -p: read in {input_file} page number {old_page_num+1} as new page {new_page_num}")
return pages_to_add, opened_files
+
def validate_inputs_second_pass(args, pages_to_add):
if args.crops:
for c_string in args.crops:
if r > len(pages_to_add):
raise HandledException(f"-r: page number beyond number of pages we're building: {r}")
+
def rotate_pages(args_rotate_page, pages_to_add):
if args_rotate_page:
for rotate_page in args_rotate_page:
page.add_transformation(pypdf.Transformation().translate(tx=A4_WIDTH/2, ty=A4_HEIGHT/2))
print(f"-r: rotating (by 90°) page {rotate_page}")
+
def pad_pages_to_multiple_of_8(pages_to_add):
mod_to_8 = len(pages_to_add) % 8
if mod_to_8 > 0:
pages_to_add += [new_page]
print(f"-n: number of input pages {old_len} not required multiple of 8, padded to {len(pages_to_add)}")
+
def normalize_pages_to_A4(pages_to_add):
for page in pages_to_add:
if "/Rotate" in page: # TODO: preserve rotation, but in canvas?
page.mediabox.right = A4_WIDTH
page.cropbox = page.mediabox
+
def collect_per_page_crops_and_zooms(args_crops, args_symmetry, pages_to_add):
crop_at_page = [PageCrop()] * len(pages_to_add)
- zoom_at_page = [1]*len(pages_to_add)
if args_crops:
for c_string in args_crops:
page_range, crops = split_crops_string(c_string)
start_page, end_page = parse_page_range(page_range, pages_to_add)
prefix = "-c, -t" if args_symmetry else "-c"
suffix = " (but alternating left and right crop between even and odd pages)" if args_symmetry else ""
- page_crop_cm = PageCrop(*[x for x in crops.split(',')])
- page_crop = PageCrop(*[float(x) * POINTS_PER_CM for x in page_crop_cm])
- crop_listing = ", ".join([f"{key} {val}cm" for key, val in page_crop_cm._asdict().items()])
- print(f"{prefix}: to pages {start_page + 1} to {end_page} applying crop: {crop_listing}{suffix}")
- cropped_width = A4_WIDTH - page_crop.left - page_crop.right
- cropped_height = A4_HEIGHT - page_crop.bottom - page_crop.top
- zoom = 1
- zoom_horizontal = A4_WIDTH / (A4_WIDTH - page_crop.left - page_crop.right)
- zoom_vertical = A4_HEIGHT / (A4_HEIGHT - page_crop.bottom - page_crop.top)
- if (zoom_horizontal > 1 and zoom_vertical < 1) or (zoom_horizontal < 1 and zoom_vertical > 1):
- raise HandledException("-c: crops would create opposing zoom directions")
- elif zoom_horizontal + zoom_vertical > 2:
- zoom = min(zoom_horizontal, zoom_vertical)
- else:
- zoom = max(zoom_horizontal, zoom_vertical)
+ page_crop = PageCrop(*[x for x in crops.split(',')])
+ print(f"{prefix}: to pages {start_page + 1} to {end_page} applying crop: {page_crop.format_in_cm}{suffix}")
for page_num in range(start_page, end_page):
if args_symmetry and page_num % 2:
- crop_at_page[page_num] = PageCrop(left=page_crop.right, right=page_crop.left, bottom=page_crop.bottom, top=page_crop.top)
+ crop_at_page[page_num] = page_crop.give_mirror()
else:
crop_at_page[page_num] = page_crop
- zoom_at_page[page_num] = zoom
- return crop_at_page, zoom_at_page
+ return crop_at_page
-def build_single_pages_output(writer, pages_to_add, crop_at_page, zoom_at_page):
+
+def build_single_pages_output(writer, pages_to_add, crop_at_page):
print("building 1-input-page-per-output-page book")
odd_page = True
for i, page in enumerate(pages_to_add):
- zoom = zoom_at_page[i]
page.add_transformation(pypdf.Transformation().translate(tx=-crop_at_page[i].left, ty=-crop_at_page[i].bottom))
- page.add_transformation(pypdf.Transformation().scale(zoom, zoom))
- cropped_width = A4_WIDTH - crop_at_page[i].left - crop_at_page[i].right
- cropped_height = A4_HEIGHT - crop_at_page[i].bottom - crop_at_page[i].top
- page.mediabox.right = cropped_width * zoom
- page.mediabox.top = cropped_height * zoom
+ page.add_transformation(pypdf.Transformation().scale(crop_at_page[i].zoom, crop_at_page[i].zoom))
+ page.mediabox.right = crop_at_page[i].remaining_width * crop_at_page[i].zoom
+ page.mediabox.top = crop_at_page[i].remaining_height * crop_at_page[i].zoom
writer.add_page(page)
odd_page = not odd_page
print(f"built page number {i+1} (of {len(pages_to_add)})")
-def build_nup4_output(writer, pages_to_add, crop_at_page, zoom_at_page, args_print_margin, args_analyze, canvas_class):
+
+def build_nup4_output(writer, pages_to_add, crop_at_page, args_print_margin, args_analyze, canvas_class):
print("-n: building 4-input-pages-per-output-page book")
print(f"-m: applying printable-area margin of {args_print_margin}cm")
if args_analyze:
print("-a: drawing page borders, spine limits")
- printable_margin = args_print_margin * POINTS_PER_CM
- printable_scale = (A4_WIDTH - 2 * printable_margin)/A4_WIDTH
- spine_part_of_page = (SPINE_LIMIT / A4_HALF_WIDTH) / printable_scale
- bonus_shrink_factor = 1 - spine_part_of_page
+ nup4_geometry = Nup4Geometry(args_print_margin)
pages_to_add, new_i_order = resort_pages_for_nup4(pages_to_add)
- nup4_position = 0
+ nup4_i = 0
page_count = 0
is_front_page = True
for i, page in enumerate(pages_to_add):
- if nup4_position == 0:
+ if nup4_i == 0:
new_page = pypdf.PageObject.create_blank_page(width=A4_WIDTH, height=A4_HEIGHT)
corrected_i = new_i_order[i]
- nup4_inner_page_transform(page, crop_at_page[corrected_i], zoom_at_page[corrected_i], bonus_shrink_factor, printable_margin, printable_scale, nup4_position)
- nup4_outer_page_transform(page, bonus_shrink_factor, nup4_position)
+ nup4_inner_page_transform(page, crop_at_page[corrected_i], nup4_geometry, nup4_i)
+ nup4_outer_page_transform(page, nup4_geometry, nup4_i)
new_page.merge_page(page)
page_count += 1
print(f"merged page number {page_count} (of {len(pages_to_add)})")
- nup4_position += 1
- if nup4_position > 3:
- ornate_nup4(writer, args_analyze, is_front_page, new_page, printable_margin, printable_scale, bonus_shrink_factor, canvas_class)
+ nup4_i += 1
+ if nup4_i > 3:
+ ornate_nup4(writer, args_analyze, is_front_page, new_page, nup4_geometry, canvas_class)
writer.add_page(new_page)
- nup4_position = 0
+ nup4_i = 0
is_front_page = not is_front_page
+
def resort_pages_for_nup4(pages_to_add):
new_page_order = []
new_i_order = []
n_eights += 1
return new_page_order, new_i_order
-def nup4_inner_page_transform(page, crop, zoom, bonus_shrink_factor, printable_margin, printable_scale, nup4_position):
- page.add_transformation(pypdf.Transformation().translate(ty=(A4_HEIGHT / zoom - (A4_HEIGHT - crop.top))))
- if nup4_position == 0 or nup4_position == 2:
+
+def nup4_inner_page_transform(page, crop, nup4_geometry, nup4_i):
+ page.add_transformation(pypdf.Transformation().translate(ty=(A4_HEIGHT / crop.zoom - (A4_HEIGHT - crop.top))))
+ if nup4_i == 0 or nup4_i == 2:
page.add_transformation(pypdf.Transformation().translate(tx=-crop.left))
- elif nup4_position == 1 or nup4_position == 3:
- page.add_transformation(pypdf.Transformation().translate(tx=(A4_WIDTH / zoom - (A4_WIDTH - crop.right))))
- page.add_transformation(pypdf.Transformation().scale(zoom * bonus_shrink_factor, zoom * bonus_shrink_factor))
- if nup4_position == 2 or nup4_position == 3:
- page.add_transformation(pypdf.Transformation().translate(ty=-2*printable_margin/printable_scale))
-
-def nup4_outer_page_transform(page, bonus_shrink_factor, nup4_position):
- page.add_transformation(pypdf.Transformation().translate(ty=(1-bonus_shrink_factor)*A4_HEIGHT))
- if nup4_position == 0 or nup4_position == 1:
+ elif nup4_i == 1 or nup4_i == 3:
+ page.add_transformation(pypdf.Transformation().translate(tx=(A4_WIDTH / crop.zoom - (A4_WIDTH - crop.right))))
+ page.add_transformation(pypdf.Transformation().scale(crop.zoom * nup4_geometry.shrink_for_spine, crop.zoom * nup4_geometry.shrink_for_spine))
+ if nup4_i == 2 or nup4_i == 3:
+ page.add_transformation(pypdf.Transformation().translate(ty=-2*nup4_geometry.margin/nup4_geometry.shrink_for_margin))
+
+
+def nup4_outer_page_transform(page, nup4_geometry, nup4_i):
+ page.add_transformation(pypdf.Transformation().translate(ty=(1-nup4_geometry.shrink_for_spine)*A4_HEIGHT))
+ if nup4_i == 0 or nup4_i == 1:
y_section = A4_HEIGHT
page.mediabox.bottom = A4_HALF_HEIGHT
page.mediabox.top = A4_HEIGHT
- if nup4_position == 2 or nup4_position == 3:
+ if nup4_i == 2 or nup4_i == 3:
y_section = 0
page.mediabox.bottom = 0
page.mediabox.top = A4_HALF_HEIGHT
- if nup4_position == 0 or nup4_position == 2:
+ if nup4_i == 0 or nup4_i == 2:
x_section = 0
page.mediabox.left = 0
page.mediabox.right = A4_HALF_WIDTH
- if nup4_position == 1 or nup4_position == 3:
- page.add_transformation(pypdf.Transformation().translate(tx=(1-bonus_shrink_factor)*A4_WIDTH))
+ if nup4_i == 1 or nup4_i == 3:
+ page.add_transformation(pypdf.Transformation().translate(tx=(1-nup4_geometry.shrink_for_spine)*A4_WIDTH))
x_section = A4_WIDTH
page.mediabox.left = A4_HALF_WIDTH
page.mediabox.right = A4_WIDTH
page.add_transformation(pypdf.Transformation().translate(tx=x_section, ty=y_section))
page.add_transformation(pypdf.Transformation().scale(QUARTER_SCALE_FACTOR, QUARTER_SCALE_FACTOR))
-def ornate_nup4(writer, args_analyze, is_front_page, new_page, printable_margin, printable_scale, bonus_shrink_factor, canvas_class):
+
+def ornate_nup4(writer, args_analyze, is_front_page, new_page, nup4_geometry, canvas_class):
if args_analyze:
# borders
packet = io.BytesIO()
c.save()
new_pdf = pypdf.PdfReader(packet)
new_page.merge_page(new_pdf.pages[0])
- printable_offset_x = printable_margin
- printable_offset_y = printable_margin * A4_HEIGHT / A4_WIDTH
- new_page.add_transformation(pypdf.Transformation().scale(printable_scale, printable_scale))
+ printable_offset_x = nup4_geometry.margin
+ printable_offset_y = nup4_geometry.margin * A4_HEIGHT / A4_WIDTH
+ new_page.add_transformation(pypdf.Transformation().scale(nup4_geometry.shrink_for_margin, nup4_geometry.shrink_for_margin))
new_page.add_transformation(pypdf.Transformation().translate(tx=printable_offset_x, ty=printable_offset_y))
- x_left_spine_limit = A4_HALF_WIDTH * bonus_shrink_factor
+ x_left_spine_limit = A4_HALF_WIDTH * nup4_geometry.shrink_for_spine
x_right_spine_limit = A4_WIDTH - x_left_spine_limit
if args_analyze or is_front_page:
packet = io.BytesIO()
new_pdf = pypdf.PdfReader(packet)
new_page.merge_page(new_pdf.pages[0])
+
def draw_cut(canvas, x_spine_limit, direction):
outer_start_x = x_spine_limit - 0.5 * CUT_WIDTH * direction
inner_start_x = x_spine_limit + 0.5 * CUT_WIDTH * direction
canvas.line(x_spine_limit, end_point_y, x_spine_limit, middle_point_y)
canvas.line(x_spine_limit, middle_point_y, outer_start_x, A4_HALF_HEIGHT)
+
def main():
args = parse_args()
validate_inputs_first_pass(args)
if args.nup4:
pad_pages_to_multiple_of_8(pages_to_add)
normalize_pages_to_A4(pages_to_add)
- crop_at_page, zoom_at_page = collect_per_page_crops_and_zooms(args.crops, args.symmetry, pages_to_add)
+ crop_at_page = collect_per_page_crops_and_zooms(args.crops, args.symmetry, pages_to_add)
writer = pypdf.PdfWriter()
if args.nup4:
- build_nup4_output(writer, pages_to_add, crop_at_page, zoom_at_page, args.print_margin, args.analyze, Canvas)
+ build_nup4_output(writer, pages_to_add, crop_at_page, args.print_margin, args.analyze, Canvas)
else:
- build_single_pages_output(writer, pages_to_add, crop_at_page, zoom_at_page)
+ build_single_pages_output(writer, pages_to_add, crop_at_page)
for file in opened_files:
file.close()
with open(args.output_file, 'wb') as output_file:
projects / misc / blobdiff