From: Christian Heller Date: Sun, 24 Sep 2023 18:31:20 +0000 (+0200) Subject: Bookmaker: some more refactoring. X-Git-Url: https://plomlompom.com/repos/bar%20baz.html?a=commitdiff_plain;h=04f76905a053fc4d1a56fc3382ba171faa1056bf;p=misc Bookmaker: some more refactoring. --- diff --git a/bookmaker.py b/bookmaker.py index 0018779..8df8814 100755 --- a/bookmaker.py +++ b/bookmaker.py @@ -73,15 +73,20 @@ try: 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): @@ -138,14 +143,14 @@ def parse_page_range(range_string, pages): 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) @@ -330,13 +335,9 @@ def main(): 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 = [] @@ -391,23 +392,23 @@ def main(): 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)})") @@ -419,10 +420,10 @@ def main(): 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) @@ -431,7 +432,7 @@ def main(): 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() @@ -443,8 +444,8 @@ def main(): 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)