/
display.py
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/
display.py
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from io import BufferedReader, BytesIO
from typing import TYPE_CHECKING, List, Optional, Tuple, Union
import PIL.Image
import PIL.ImageDraw
from wand.image import Color as WandColor # type: ignore
from wand.image import Image as WandImage
from . import utils
from ._typing import T_bbox, T_num, T_obj, T_obj_list, T_point, T_seq
from .table import T_table_settings, Table, TableFinder, TableSettings
if TYPE_CHECKING: # pragma: nocover
from pandas.core.frame import DataFrame
from pandas.core.series import Series
from .page import Page
class COLORS:
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)
TRANSPARENT = (0, 0, 0, 0)
DEFAULT_FILL = COLORS.BLUE + (50,)
DEFAULT_STROKE = COLORS.RED + (200,)
DEFAULT_STROKE_WIDTH = 1
DEFAULT_RESOLUTION = 72
T_color = Union[Tuple[int, int, int], Tuple[int, int, int, int], str]
T_contains_points = Union[Tuple[T_point, ...], List[T_point], T_obj]
def get_page_image(stream: BufferedReader, page_no: int, resolution: int) -> WandImage:
# If we are working with a file object saved to disk
if hasattr(stream, "name"):
filename = f"{stream.name}[{page_no}]"
file = None
def postprocess(img: WandImage) -> WandImage:
return img
# If we instead are working with a BytesIO stream
else:
stream.seek(0)
filename = None
file = stream
def postprocess(img: WandImage) -> WandImage:
return WandImage(image=img.sequence[page_no])
with WandImage(resolution=resolution, filename=filename, file=file) as img_init:
img = postprocess(img_init)
if img.alpha_channel:
img.background_color = WandColor("white")
img.alpha_channel = "remove"
with img.convert("png") as png:
im = PIL.Image.open(BytesIO(png.make_blob()))
return im.convert("RGB")
class PageImage:
def __init__(
self,
page: "Page",
original: Optional[WandImage] = None,
resolution: int = DEFAULT_RESOLUTION,
):
self.page = page
if original is None:
self.original = get_page_image(
page.pdf.stream, page.page_number - 1, resolution
)
else:
self.original = original
if page.is_original:
self.root = page
cropped = False
else:
self.root = page.root_page
cropped = page.root_page.bbox != page.bbox
self.scale = self.original.size[0] / self.root.width
if cropped:
cropbox = (
(page.bbox[0] - page.root_page.bbox[0]) * self.scale,
(page.bbox[1] - page.root_page.bbox[1]) * self.scale,
(page.bbox[2] - page.root_page.bbox[0]) * self.scale,
(page.bbox[3] - page.root_page.bbox[1]) * self.scale,
)
self.original = self.original.crop(tuple(map(int, cropbox)))
self.reset()
def _reproject_bbox(self, bbox: T_bbox) -> T_bbox:
x0, top, x1, bottom = bbox
_x0, _top = self._reproject((x0, top))
_x1, _bottom = self._reproject((x1, bottom))
return (_x0, _top, _x1, _bottom)
def _reproject(self, coord: T_point) -> T_point:
"""
Given an (x0, top) tuple from the *root* coordinate system,
return an (x0, top) tuple in the *image* coordinate system.
"""
x0, top = coord
px0, ptop = self.page.bbox[:2]
rx0, rtop = self.root.bbox[:2]
_x0 = (x0 + rx0 - px0) * self.scale
_top = (top + rtop - ptop) * self.scale
return (_x0, _top)
def reset(self) -> "PageImage":
self.annotated = PIL.Image.new(self.original.mode, self.original.size)
self.annotated.paste(self.original)
self.draw = PIL.ImageDraw.Draw(self.annotated, "RGBA")
self.save = self.annotated.save
return self
def copy(self) -> "PageImage":
return self.__class__(self.page, self.original)
def draw_line(
self,
points_or_obj: T_contains_points,
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
if isinstance(points_or_obj, (tuple, list)):
points = points_or_obj
elif isinstance(points_or_obj, dict) and "points" in points_or_obj:
points = points_or_obj["points"]
else:
obj = points_or_obj
points = ((obj["x0"], obj["top"]), (obj["x1"], obj["bottom"]))
self.draw.line(
list(map(self._reproject, points)), fill=stroke, width=stroke_width
)
return self
def draw_lines(
self,
list_of_lines: Union[T_seq[T_contains_points], "DataFrame"],
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
for x in utils.to_list(list_of_lines):
self.draw_line(x, stroke=stroke, stroke_width=stroke_width)
return self
def draw_vline(
self,
location: T_num,
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
points = (location, self.page.bbox[1], location, self.page.bbox[3])
self.draw.line(self._reproject_bbox(points), fill=stroke, width=stroke_width)
return self
def draw_vlines(
self,
locations: Union[List[T_num], "Series"],
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
for x in list(locations):
self.draw_vline(x, stroke=stroke, stroke_width=stroke_width)
return self
def draw_hline(
self,
location: T_num,
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
points = (self.page.bbox[0], location, self.page.bbox[2], location)
self.draw.line(self._reproject_bbox(points), fill=stroke, width=stroke_width)
return self
def draw_hlines(
self,
locations: Union[List[T_num], "Series"],
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
for x in list(locations):
self.draw_hline(x, stroke=stroke, stroke_width=stroke_width)
return self
def draw_rect(
self,
bbox_or_obj: Union[T_bbox, T_obj],
fill: T_color = DEFAULT_FILL,
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
if isinstance(bbox_or_obj, (tuple, list)):
bbox = bbox_or_obj
else:
obj = bbox_or_obj
bbox = (obj["x0"], obj["top"], obj["x1"], obj["bottom"])
x0, top, x1, bottom = bbox
half = stroke_width / 2
x0 += half
top += half
x1 -= half
bottom -= half
self.draw.rectangle(
self._reproject_bbox((x0, top, x1, bottom)), fill, COLORS.TRANSPARENT
)
if stroke_width > 0:
segments = [
((x0, top), (x1, top)), # top
((x0, bottom), (x1, bottom)), # bottom
((x0, top), (x0, bottom)), # left
((x1, top), (x1, bottom)), # right
]
self.draw_lines(segments, stroke=stroke, stroke_width=stroke_width)
return self
def draw_rects(
self,
list_of_rects: Union[List[T_bbox], T_obj_list, "DataFrame"],
fill: T_color = DEFAULT_FILL,
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
for x in utils.to_list(list_of_rects):
self.draw_rect(x, fill=fill, stroke=stroke, stroke_width=stroke_width)
return self
def draw_circle(
self,
center_or_obj: Union[T_point, T_obj],
radius: int = 5,
fill: T_color = DEFAULT_FILL,
stroke: T_color = DEFAULT_STROKE,
) -> "PageImage":
if isinstance(center_or_obj, tuple):
center = center_or_obj
else:
obj = center_or_obj
center = ((obj["x0"] + obj["x1"]) / 2, (obj["top"] + obj["bottom"]) / 2)
cx, cy = center
bbox = (cx - radius, cy - radius, cx + radius, cy + radius)
self.draw.ellipse(self._reproject_bbox(bbox), fill, stroke)
return self
def draw_circles(
self,
list_of_circles: Union[List[T_point], T_obj_list, "DataFrame"],
radius: int = 5,
fill: T_color = DEFAULT_FILL,
stroke: T_color = DEFAULT_STROKE,
) -> "PageImage":
for x in utils.to_list(list_of_circles):
self.draw_circle(x, radius=radius, fill=fill, stroke=stroke)
return self
def debug_table(
self,
table: Table,
fill: T_color = DEFAULT_FILL,
stroke: T_color = DEFAULT_STROKE,
stroke_width: int = 1,
) -> "PageImage":
"""
Outline all found tables.
"""
self.draw_rects(
table.cells, fill=fill, stroke=stroke, stroke_width=stroke_width
)
return self
def debug_tablefinder(
self, tf: Optional[Union[TableFinder, TableSettings, T_table_settings]] = None
) -> "PageImage":
if isinstance(tf, TableFinder):
finder = tf
elif isinstance(tf, (TableSettings, dict)):
finder = self.page.debug_tablefinder(tf)
else:
raise ValueError(
"Argument must be instance of TableFinder"
"or a TableFinder settings dict."
)
for table in finder.tables:
self.debug_table(table)
self.draw_lines(finder.edges, stroke_width=1)
self.draw_circles(
list(finder.intersections.keys()),
fill=COLORS.TRANSPARENT,
stroke=COLORS.BLUE + (200,),
radius=3,
)
return self
def outline_words(
self,
stroke: T_color = DEFAULT_STROKE,
fill: T_color = DEFAULT_FILL,
stroke_width: int = DEFAULT_STROKE_WIDTH,
x_tolerance: T_num = utils.DEFAULT_X_TOLERANCE,
y_tolerance: T_num = utils.DEFAULT_Y_TOLERANCE,
) -> "PageImage":
words = self.page.extract_words(
x_tolerance=x_tolerance, y_tolerance=y_tolerance
)
self.draw_rects(words, stroke=stroke, fill=fill, stroke_width=stroke_width)
return self
def outline_chars(
self,
stroke: T_color = (255, 0, 0, 255),
fill: T_color = (255, 0, 0, int(255 / 4)),
stroke_width: int = DEFAULT_STROKE_WIDTH,
) -> "PageImage":
self.draw_rects(
self.page.chars, stroke=stroke, fill=fill, stroke_width=stroke_width
)
return self
def _repr_png_(self) -> bytes:
b = BytesIO()
self.annotated.save(b, "PNG")
return b.getvalue()