From: Christian Heller Date: Sun, 24 Sep 2023 22:13:32 +0000 (+0200) Subject: Bookmaker: more refactoring. X-Git-Url: https://plomlompom.com/repos/condition_titles?a=commitdiff_plain;h=47391e94c5c3676c652e7530c8cbbe96e9ca6da0;p=misc Bookmaker: more refactoring. --- diff --git a/bookmaker.py b/bookmaker.py index d111cf1..2dd9653 100755 --- a/bookmaker.py +++ b/bookmaker.py @@ -86,11 +86,11 @@ 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 +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 + class PageCrop: def __init__(self, left_cm=0, bottom_cm=0, right_cm=0, top_cm=0): @@ -130,11 +130,14 @@ class PageCrop: return PageCrop(left_cm=self.right_cm, bottom_cm=self.bottom_cm, right_cm=self.left_cm, top_cm=self.top_cm) -class PrintableMargin: +class Nup4Geometry: - def __init__(self, size_cm): - self.size = size_cm * POINTS_PER_CM - self.zoom = (A4_WIDTH - 2 * self.size)/A4_WIDTH + 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): @@ -350,32 +353,31 @@ def build_single_pages_output(writer, pages_to_add, crop_at_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, 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 = PrintableMargin(args_print_margin) - spine_part_of_page = (SPINE_LIMIT / A4_HALF_WIDTH) / printable_margin.zoom - 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], bonus_shrink_factor, printable_margin, 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, 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 @@ -399,33 +401,33 @@ def resort_pages_for_nup4(pages_to_add): return new_page_order, new_i_order -def nup4_inner_page_transform(page, crop, bonus_shrink_factor, printable_margin, nup4_position): +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_position == 0 or nup4_position == 2: + 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: + 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 * bonus_shrink_factor, crop.zoom * bonus_shrink_factor)) - if nup4_position == 2 or nup4_position == 3: - page.add_transformation(pypdf.Transformation().translate(ty=-2*printable_margin.size/printable_margin.zoom)) + 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, 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: +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 @@ -433,7 +435,7 @@ def nup4_outer_page_transform(page, bonus_shrink_factor, nup4_position): 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, 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() @@ -448,11 +450,11 @@ def ornate_nup4(writer, args_analyze, is_front_page, new_page, printable_margin, c.save() new_pdf = pypdf.PdfReader(packet) new_page.merge_page(new_pdf.pages[0]) - printable_offset_x = printable_margin.size - printable_offset_y = printable_margin.size * A4_HEIGHT / A4_WIDTH - new_page.add_transformation(pypdf.Transformation().scale(printable_margin.zoom, printable_margin.zoom)) + 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()