224 lines
6.2 KiB
Python
224 lines
6.2 KiB
Python
# -*- coding: utf-8 -*-
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try:
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import matplotlib.pyplot as plt
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import matplotlib.patches as patches
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except ImportError:
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_HAS_MPL = False
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else:
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_HAS_MPL = True
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class PlotMethods(object):
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def __call__(self, table, kind="text", filename=None):
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"""Plot elements found on PDF page based on kind
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specified, useful for debugging and playing with different
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parameters to get the best output.
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Parameters
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----------
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table: camelot.core.Table
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A Camelot Table.
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kind : str, optional (default: 'text')
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{'text', 'grid', 'contour', 'joint', 'line'}
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The element type for which a plot should be generated.
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filepath: str, optional (default: None)
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Absolute path for saving the generated plot.
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Returns
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-------
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fig : matplotlib.fig.Figure
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"""
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if not _HAS_MPL:
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raise ImportError("matplotlib is required for plotting.")
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if table.flavor == "lattice" and kind in ["textedge"]:
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raise NotImplementedError(
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f"Lattice flavor does not support kind='{kind}'"
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)
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elif table.flavor == "stream" and kind in ["joint", "line"]:
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raise NotImplementedError(
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f"Stream flavor does not support kind='{kind}'"
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)
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plot_method = getattr(self, kind)
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return plot_method(table)
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def text(self, table):
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"""Generates a plot for all text elements present
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on the PDF page.
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Parameters
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----------
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table : camelot.core.Table
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Returns
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-------
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fig : matplotlib.fig.Figure
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"""
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fig = plt.figure()
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ax = fig.add_subplot(111, aspect="equal")
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xs, ys = [], []
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for t in table._text:
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xs.extend([t[0], t[2]])
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ys.extend([t[1], t[3]])
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ax.add_patch(patches.Rectangle((t[0], t[1]), t[2] - t[0], t[3] - t[1]))
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ax.set_xlim(min(xs) - 10, max(xs) + 10)
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ax.set_ylim(min(ys) - 10, max(ys) + 10)
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return fig
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def grid(self, table):
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"""Generates a plot for the detected table grids
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on the PDF page.
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Parameters
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----------
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table : camelot.core.Table
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Returns
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-------
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fig : matplotlib.fig.Figure
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"""
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fig = plt.figure()
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ax = fig.add_subplot(111, aspect="equal")
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for row in table.cells:
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for cell in row:
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if cell.left:
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ax.plot([cell.lb[0], cell.lt[0]], [cell.lb[1], cell.lt[1]])
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if cell.right:
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ax.plot([cell.rb[0], cell.rt[0]], [cell.rb[1], cell.rt[1]])
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if cell.top:
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ax.plot([cell.lt[0], cell.rt[0]], [cell.lt[1], cell.rt[1]])
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if cell.bottom:
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ax.plot([cell.lb[0], cell.rb[0]], [cell.lb[1], cell.rb[1]])
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return fig
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def contour(self, table):
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"""Generates a plot for all table boundaries present
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on the PDF page.
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Parameters
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----------
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table : camelot.core.Table
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Returns
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-------
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fig : matplotlib.fig.Figure
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"""
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try:
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img, table_bbox = table._image
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_FOR_LATTICE = True
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except TypeError:
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img, table_bbox = (None, {table._bbox: None})
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_FOR_LATTICE = False
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fig = plt.figure()
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ax = fig.add_subplot(111, aspect="equal")
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xs, ys = [], []
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if not _FOR_LATTICE:
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for t in table._text:
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xs.extend([t[0], t[2]])
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ys.extend([t[1], t[3]])
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ax.add_patch(
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patches.Rectangle(
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(t[0], t[1]), t[2] - t[0], t[3] - t[1], color="blue"
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)
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)
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for t in table_bbox.keys():
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ax.add_patch(
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patches.Rectangle(
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(t[0], t[1]), t[2] - t[0], t[3] - t[1], fill=False, color="red"
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)
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)
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if not _FOR_LATTICE:
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xs.extend([t[0], t[2]])
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ys.extend([t[1], t[3]])
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ax.set_xlim(min(xs) - 10, max(xs) + 10)
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ax.set_ylim(min(ys) - 10, max(ys) + 10)
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if _FOR_LATTICE:
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ax.imshow(img)
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return fig
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def textedge(self, table):
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"""Generates a plot for relevant textedges.
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Parameters
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----------
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table : camelot.core.Table
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Returns
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-------
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fig : matplotlib.fig.Figure
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"""
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fig = plt.figure()
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ax = fig.add_subplot(111, aspect="equal")
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xs, ys = [], []
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for t in table._text:
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xs.extend([t[0], t[2]])
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ys.extend([t[1], t[3]])
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ax.add_patch(
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patches.Rectangle((t[0], t[1]), t[2] - t[0], t[3] - t[1], color="blue")
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)
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ax.set_xlim(min(xs) - 10, max(xs) + 10)
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ax.set_ylim(min(ys) - 10, max(ys) + 10)
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for te in table._textedges:
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ax.plot([te.x, te.x], [te.y0, te.y1])
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return fig
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def joint(self, table):
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"""Generates a plot for all line intersections present
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on the PDF page.
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Parameters
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----------
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table : camelot.core.Table
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Returns
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-------
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fig : matplotlib.fig.Figure
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"""
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img, table_bbox = table._image
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fig = plt.figure()
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ax = fig.add_subplot(111, aspect="equal")
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x_coord = []
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y_coord = []
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for k in table_bbox.keys():
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for coord in table_bbox[k]:
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x_coord.append(coord[0])
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y_coord.append(coord[1])
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ax.plot(x_coord, y_coord, "ro")
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ax.imshow(img)
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return fig
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def line(self, table):
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"""Generates a plot for all line segments present
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on the PDF page.
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Parameters
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----------
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table : camelot.core.Table
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Returns
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-------
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fig : matplotlib.fig.Figure
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"""
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fig = plt.figure()
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ax = fig.add_subplot(111, aspect="equal")
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vertical, horizontal = table._segments
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for v in vertical:
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ax.plot([v[0], v[2]], [v[1], v[3]])
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for h in horizontal:
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ax.plot([h[0], h[2]], [h[1], h[3]])
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return fig
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