Draw external guidelines

crop_card.py

@@ -10,6 +10,8 @@ W_INCHES_EXPECTED = 2.72
 H_INCHES_EXPECTED = 3.7
 BLEED_INCHES_EXPECTED = 0.12
 LEAVE_BLEED_INCHES = 0.04
+CUT_GUIDE_WIDTH_INCHES = 0.006
+
 
 BASE_DIR = Path(__file__).parent
 
@@ -59,7 +61,6 @@ def add_cut_guides(im: Image, dpi: float):
     cut_pixels_int = round(cut_pixels)
     draw = ImageDraw.Draw(im)
     LENGTH_CUT_GUIDE_INCHES = 0.06
-    CUT_GUIDE_WIDTH_INCHES = 0.006
     guide_len = round(LENGTH_CUT_GUIDE_INCHES * dpi)
     guide_thickness = round(CUT_GUIDE_WIDTH_INCHES * dpi)
     cut_x_l = cut_pixels_int
@@ -98,7 +99,7 @@ def crop(input_filepath: Path) -> Path:
             print(f'By width dpi is {dpi_by_w} dpi')
             if dpi_by_h != dpi_by_w:
                 print(f'dpi by height is different: {dpi_by_h} dpi')
-            crop_pixels = (BLEED_INCHES_EXPECTED - LEAVE_BLEED_INCHES) * dpi_by_w
+            crop_pixels = BLEED_INCHES_EXPECTED * dpi_by_w - LEAVE_BLEED_INCHES * dpi_by_w
             crop_pixels_int = round(crop_pixels)
             print(f'Image is {w} x {h}, will trim {crop_pixels} pixels (rounded to {crop_pixels_int})')
 
@@ -141,8 +142,9 @@ class SheetLayout:
         self.h_inches = h_inches
         self.w = self.in_to_px(self.w_inches)
         self.h = self.in_to_px(self.h_inches)
-        self.cropped_image_dest_w = self.in_to_px(self.card_w_inches + LEAVE_BLEED_INCHES)
+        self.leave_bleed = self.in_to_px(LEAVE_BLEED_INCHES)
-        self.cropped_image_dest_h = self.in_to_px(self.card_h_inches + LEAVE_BLEED_INCHES)
+        self.cropped_image_dest_w = self.card_w + self.leave_bleed * 2
+        self.cropped_image_dest_h = self.card_h + self.leave_bleed * 2
 
         self.spacing_inches = 0.05
         self.spacing = self.in_to_px(self.spacing_inches)
@@ -164,21 +166,62 @@ class SheetLayout:
     def in_to_px(self, inches: float) -> float:
         return round(inches * self.dpi)
 
-    def topleft_of_card(self, y_index: int, x_index: int) -> Tuple[int, int]:
+    def top_of_row(self, y_index: int, with_bleed: bool) -> int:
-        assert 0 <= x_index < self.cards_per_row
         assert 0 <= y_index < self.cards_per_column
-        x = self.blank_space_w + (self.cropped_image_dest_w + self.spacing) * x_index
+        top = self.blank_space_h + (self.cropped_image_dest_h + self.spacing) * y_index
-        y = self.blank_space_h + (self.cropped_image_dest_h + self.spacing) * y_index
+        if not with_bleed:
+            top += self.leave_bleed
+        return top
+
+    def bottom_of_row(self, y_index: int, with_bleed: bool) -> int:
+        if with_bleed:
+            return self.top_of_row(y_index, True) + self.cropped_image_dest_h
+        else:
+            return self.top_of_row(y_index, False) + self.card_h
+
+    def left_of_column(self, x_index: int, with_bleed: bool) -> int:
+        assert 0 <= x_index < self.cards_per_row
+        left = self.blank_space_w + (self.cropped_image_dest_w + self.spacing) * x_index
+        if not with_bleed:
+            left += self.leave_bleed
+        return left
+
+    def right_of_column(self, x_index: int, with_bleed: bool) -> int:
+        if with_bleed:
+            return self.left_of_column(x_index, True) + self.cropped_image_dest_w
+        else:
+            return self.left_of_column(x_index, False) + self.card_w
+
+    def topleft_of_card_with_bleed(self, y_index: int, x_index: int) -> Tuple[int, int]:
+        x = self.left_of_column(x_index, with_bleed=True)
+        y = self.top_of_row(y_index, with_bleed=True)
         return (x, y)
 
 
 def create_sheet(cropped_filepaths: List[Path], sheet_filepath: Path, sheet_layout: SheetLayout):
     sheet = Image.new('RGB', (sheet_layout.w, sheet_layout.h), 'white')
 
+    # Draw external guidelines
+    draw = ImageDraw.Draw(sheet)
+    color = 'black'
+    guide_thickness = sheet_layout.in_to_px(CUT_GUIDE_WIDTH_INCHES)
+
+    for x_index in range(sheet_layout.cards_per_column):
+        left_x = sheet_layout.left_of_column(x_index, with_bleed=False)
+        right_x = sheet_layout.right_of_column(x_index, with_bleed=False)
+        draw.line([(left_x, 0), (left_x, sheet_layout.h)], fill=color, width=guide_thickness)
+        draw.line([(right_x, 0), (right_x, sheet_layout.h)], fill=color, width=guide_thickness)
+
+    for y_index in range(sheet_layout.cards_per_row):
+        top_y = sheet_layout.top_of_row(y_index, with_bleed=False)
+        bottom_y = sheet_layout.bottom_of_row(y_index, with_bleed=False)
+        draw.line([(0, top_y), (sheet_layout.w, top_y)], fill=color, width=guide_thickness)
+        draw.line([(0, bottom_y), (sheet_layout.w, bottom_y)], fill=color, width=guide_thickness)
+
     # Draw cards
     filenames_iter = cropped_filepaths.__iter__()
-    for y in range(sheet_layout.cards_per_column):
+    for y_index in range(sheet_layout.cards_per_column):
-        for x in range(sheet_layout.cards_per_row):
+        for x_index in range(sheet_layout.cards_per_row):
             try:
                 filepath = filenames_iter.__next__()
             except StopIteration:
@@ -187,7 +230,9 @@ def create_sheet(cropped_filepaths: List[Path], sheet_filepath: Path, sheet_layo
             with Image.open(filepath) as card_im:
                 card_im = card_im.resize((sheet_layout.cropped_image_dest_w, sheet_layout.cropped_image_dest_h),
                                          resample = Image.Resampling.LANCZOS)
-                sheet.paste(card_im, sheet_layout.topleft_of_card(y, x))
+                sheet.paste(card_im, sheet_layout.topleft_of_card_with_bleed(y_index, x_index))
+
+        # TODO: Draw internal guidelines
 
     # Save sheet
     sheet.save(sheet_filepath, 'JPEG', dpi=(sheet_layout.dpi, sheet_layout.dpi), quality=100, subsampling=0)