Added options to configure Bentley Ottmann

extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.inx

@@ -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>

extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.py

@@ -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:

extensions/fablabchemnitz/contour_scanner_and_trimmer/poly_point_isect.py

@@ -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: