except ImportError:
handled_error_exit("Can't run at all without pypdf installed.")
-# some constants
+# some general paper geometry constants
POINTS_PER_CM = 10 * 72 / 25.4
A4_WIDTH = 21 * POINTS_PER_CM
A4_HEIGHT = 29.7 * POINTS_PER_CM
A4 = (A4_WIDTH, A4_HEIGHT)
+
+# constants specifically for --nup4
+A4_HALF_WIDTH = A4_WIDTH / 2
+A4_HALF_HEIGHT = A4_HEIGHT / 2
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
+QUARTER_SCALE_FACTOR = 0.5
# some helpers
class HandledException(Exception):
end_page = int(end)
return start_page, end_page
-def draw_cut(canvas, x_spine_limit, direction, half_height):
+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
- middle_point_y = half_height + MIDDLE_POINT_DEPTH * direction
- end_point_y = half_height + CUT_DEPTH * direction
- canvas.line(inner_start_x, half_height, x_spine_limit, end_point_y)
+ middle_point_y = A4_HALF_HEIGHT + MIDDLE_POINT_DEPTH * direction
+ end_point_y = A4_HALF_HEIGHT + CUT_DEPTH * direction
+ canvas.line(inner_start_x, A4_HALF_HEIGHT, x_spine_limit, end_point_y)
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, half_height)
+ canvas.line(x_spine_limit, middle_point_y, outer_start_x, A4_HALF_HEIGHT)
def parse_args():
parser = argparse.ArgumentParser(description=__doc__, epilog=help_epilogue, formatter_class=argparse.RawDescriptionHelpFormatter)
print(f"-m: applying printable-area margin of {args.print_margin}cm")
if args.analyze:
print("-a: drawing page borders, spine limits")
- n_pages_per_axis = 2
printable_margin = args.print_margin * POINTS_PER_CM
- printable_scale = (A4_WIDTH - 2*printable_margin)/A4_WIDTH
- half_width = A4_WIDTH / n_pages_per_axis
- half_height = A4_HEIGHT / n_pages_per_axis
- section_scale_factor = 1 / n_pages_per_axis
- spine_part_of_page = (SPINE_LIMIT / half_width) / printable_scale
+ 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
new_page_order = []
new_i_order = []
page.add_transformation(pypdf.Transformation().translate(ty=(1-bonus_shrink_factor)*A4_HEIGHT))
if i == 0 or i == 1:
y_section = A4_HEIGHT
- page.mediabox.bottom = half_height
+ page.mediabox.bottom = A4_HALF_HEIGHT
page.mediabox.top = A4_HEIGHT
if i == 2 or i == 3:
y_section = 0
page.mediabox.bottom = 0
- page.mediabox.top = half_height
+ page.mediabox.top = A4_HALF_HEIGHT
if i == 0 or i == 2:
x_section = 0
page.mediabox.left = 0
- page.mediabox.right = half_width
+ page.mediabox.right = A4_HALF_WIDTH
if i == 1 or i == 3:
page.add_transformation(pypdf.Transformation().translate(tx=(1-bonus_shrink_factor)*A4_WIDTH))
x_section = A4_WIDTH
- page.mediabox.left = half_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(section_scale_factor, section_scale_factor))
+ page.add_transformation(pypdf.Transformation().scale(QUARTER_SCALE_FACTOR, QUARTER_SCALE_FACTOR))
new_page.merge_page(page)
page_count += 1
print(f"merged page number {page_count} (of {len(pages_to_add)})")
c = reportlab.pdfgen.canvas.Canvas(packet, pagesize=A4)
c.setLineWidth(0.1)
c.line(0, A4_HEIGHT, A4_WIDTH, A4_HEIGHT)
- c.line(0, half_height, A4_WIDTH, half_height)
+ c.line(0, A4_HALF_HEIGHT, A4_WIDTH, A4_HALF_HEIGHT)
c.line(0, 0, A4_WIDTH, 0)
c.line(0, A4_HEIGHT, 0, 0)
- c.line(half_width, A4_HEIGHT, half_width, 0)
+ c.line(A4_HALF_WIDTH, A4_HEIGHT, A4_HALF_WIDTH, 0)
c.line(A4_WIDTH, A4_HEIGHT, A4_WIDTH, 0)
c.save()
new_pdf = pypdf.PdfReader(packet)
printable_offset_y = printable_margin * A4_HEIGHT / A4_WIDTH
new_page.add_transformation(pypdf.Transformation().scale(printable_scale, printable_scale))
new_page.add_transformation(pypdf.Transformation().translate(tx=printable_offset_x, ty=printable_offset_y))
- x_left_spine_limit = half_width * bonus_shrink_factor
+ x_left_spine_limit = A4_HALF_WIDTH * bonus_shrink_factor
x_right_spine_limit = A4_WIDTH - x_left_spine_limit
if args.analyze or front_page:
packet = io.BytesIO()
c.line(x_right_spine_limit, A4_HEIGHT, x_right_spine_limit, 0)
if front_page:
c.setLineWidth(0.2)
- draw_cut(c, x_left_spine_limit, (1), half_height)
- draw_cut(c, x_right_spine_limit, (-1), half_height)
+ draw_cut(c, x_left_spine_limit, (1))
+ draw_cut(c, x_right_spine_limit, (-1))
if args.analyze or front_page:
c.save()
new_pdf = pypdf.PdfReader(packet)