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Added options to configure Bentley Ottmann

This commit is contained in:
Mario Voigt 2021-06-22 01:06:10 +02:00
parent 7f5069387d
commit 920e0aefc2
3 changed files with 56 additions and 10 deletions
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10
extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.inx
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@ -53,6 +53,16 @@
<param name="reverse_removal_order" type="bool" gui-text="Reverse removal order" gui-description="Reverses the order of removal. Relevant for keeping certain styles of elements">false</param>
<param name="bezier_trimming" type="bool" gui-text="Trim original beziers (not working yet)" gui-description="If enabled we try to split the original bezier paths at the intersections points by finding the correct bezier segments and calculating t parameters from trimmed sub split lines. Not working yet. Will just print debug info if debug is enabled.">true</param>
<param name="keep_original_after_trim" type="bool" gui-text="Keep original paths after trimming">false</param>
<label appearance="header">Bentley Ottmann Sweep Line Settings</label>
<param name="bent_ott_use_ignore_segment_endings" type="bool" gui-text="Ignore segment endings" gui-description="Whether to ignore intersections of line segments when both their end points form the intersection point">true</param>
<param name="bent_ott_use_debug" type="bool" gui-text="Debug">false</param>
<param name="bent_ott_use_verbose" type="bool" gui-text="Verbose">false</param>
<param name="bent_ott_use_paranoid" type="bool" gui-text="Paranoid checks">false</param>
<param name="bent_ott_use_vertical" type="bool" gui-text="Support vertical segments">true</param>
<param name="bent_ott_number_type" type="optiongroup" appearance="combo" gui-text="Number type">
<option value="native">native (default)</option>
<option value="numpy">numpy</option>
</param>
</vbox>
</hbox>
</page>

36
extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.py
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@ -452,6 +452,13 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
pars.add_argument("--reverse_removal_order", type=inkex.Boolean, default=False, help="Reverses the order of removal. Relevant for keeping certain styles of elements")
pars.add_argument("--keep_original_after_trim", type=inkex.Boolean, default=False, help="Keep original paths after trimming")
pars.add_argument("--bent_ott_use_ignore_segment_endings", type=inkex.Boolean, default=True, help="Whether to ignore intersections of line segments when both their end points form the intersection point")
pars.add_argument("--bent_ott_use_debug", type=inkex.Boolean, default=False)
pars.add_argument("--bent_ott_use_verbose", type=inkex.Boolean, default=False)
pars.add_argument("--bent_ott_use_paranoid", type=inkex.Boolean, default=False)
pars.add_argument("--bent_ott_use_vertical", type=inkex.Boolean, default=True)
pars.add_argument("--bent_ott_number_type", default="native")
#Style - General Style
pars.add_argument("--strokewidth", type=float, default=1.0, help="Stroke width (px)")
pars.add_argument("--dotsize_intersections", type=int, default=30, help="Dot size (px) for self-intersecting and global intersection points")
@ -720,6 +727,33 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
'''
if so.draw_trimmed is True:
try:
#some config for Bentley Ottmann
poly_point_isect.USE_IGNORE_SEGMENT_ENDINGS = so.bent_ott_use_ignore_segment_endings
poly_point_isect.USE_DEBUG = so.bent_ott_use_debug
poly_point_isect.USE_VERBOSE = so.bent_ott_use_verbose
if so.show_debug is False:
poly_point_isect.USE_VERBOSE = False
poly_point_isect.USE_PARANOID = so.bent_ott_use_paranoid
poly_point_isect.USE_VERTICAL = so.bent_ott_use_vertical
NUMBER_TYPE = so.bent_ott_number_type
if NUMBER_TYPE == 'native':
Real = float
NUM_EPS = Real("1e-10")
NUM_INF = Real(float("inf"))
elif NUMBER_TYPE == 'numpy':
import numpy
Real = numpy.float64
del numpy
NUM_EPS = Real("1e-10")
NUM_INF = Real(float("inf"))
poly_point_isect.Real = Real
poly_point_isect.NUM_EPS = NUM_EPS
poly_point_isect.NUM_INF = NUM_INF
poly_point_isect.NUM_EPS_SQ = NUM_EPS * NUM_EPS
poly_point_isect.NUM_ZERO = Real(0.0)
poly_point_isect.NUM_ONE = Real(1.0)
allSubSplitLineStrings = []
for subSplitLine in subSplitLineArray:
csp = subSplitLine.path.to_arrays()
@ -735,6 +769,8 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
# Very small step sizes over near-vertical lines can cause errors. We hide exceptions with try-catch, thus we disabled the debugging in poly_point_isect:
# by setting USE_DEBUG = False (True was default setting)
if so.show_debug is True:
self.msg("Going to calculate intersections using Bentley Ottmann Sweep Line Algorithm")
globalIntersectionPoints = MultiPoint(isect_segments(allSubSplitLineStrings, validate=True))
if so.show_debug is True:

6
extensions/fablabchemnitz/contour_scanner_and_trimmer/poly_point_isect.py
View File

@ -1,8 +1,8 @@
# BentleyOttmann sweep-line implementation
# (for finding all intersections in a set of line segments)
from __future__ import annotations
import inkex
__all__ = (
"isect_segments",
@ -26,7 +26,7 @@ __all__ = (
# their end points form the intersection point.
USE_IGNORE_SEGMENT_ENDINGS = True
USE_DEBUG = False
USE_DEBUG = True
USE_VERBOSE = False
@ -590,7 +590,7 @@ def isect_segments_impl(segments, *, include_segments=False, validate=True) -> l
while len(queue.events_scan) > 0:
if USE_VERBOSE:
print(len(queue.events_scan), sweep_line._current_event_point_x)
inkex.utils.debug("event {}: x={}".format(len(queue.events_scan), sweep_line._current_event_point_x))
p, e_ls = queue.poll()
for events_current in e_ls:
if events_current: