use @staticmethod for BooleanOperationManager and export top-level functions

Lib/booleanOperations/__init__.py

@@ -1,4 +1,11 @@
 from __future__ import print_function, division, absolute_import
 from .booleanOperationManager import BooleanOperationManager
 
-__version__ = "0.2"
+__version__ = "0.3"
+
+# export BooleanOperationManager static methods
+union = BooleanOperationManager.union
+difference = BooleanOperationManager.difference
+intersection = BooleanOperationManager.intersection
+xor = BooleanOperationManager.xor
+getIntersections = BooleanOperationManager.getIntersections

Lib/booleanOperations/booleanOperationManager.py

@@ -13,58 +13,64 @@
 """
 
 
-class BooleanOperationManager(object):
+def _performOperation(operation, subjectContours, clipContours, outPen):
+    # prep the contours
+    subjectInputContours = [InputContour(contour) for contour in subjectContours if contour and len(contour) > 1]
+    clipInputContours = [InputContour(contour) for contour in clipContours if contour and len(contour) > 1]
+    inputContours = subjectInputContours + clipInputContours
 
-    def _performOperation(self, operation, subjectContours, clipContours, outPen):
-        # prep the contours
-        subjectInputContours = [InputContour(contour) for contour in subjectContours if contour and len(contour) > 1]
-        clipInputContours = [InputContour(contour) for contour in clipContours if contour and len(contour) > 1]
-        inputContours = subjectInputContours + clipInputContours
-
-        resultContours = pyClipper.clipExecute([subjectInputContour.originalFlat for subjectInputContour in subjectInputContours],
-                                               [clipInputContour.originalFlat for clipInputContour in clipInputContours],
-                                               operation, subjectFillType="noneZero", clipFillType="noneZero")
-        # convert to output contours
-        outputContours = [OutputContour(contour) for contour in resultContours]
-        # re-curve entire contour
-        for inputContour in inputContours:
-            for outputContour in outputContours:
-                if outputContour.final:
-                    continue
-                if outputContour.reCurveFromEntireInputContour(inputContour):
-                    # the input is expired if a match was made,
-                    # so stop passing it to the outputs
-                    break
-        # re-curve segments
-        for inputContour in inputContours:
-            # skip contours that were comppletely used in the previous step
-            if inputContour.used:
-                continue
-            # XXX this could be expensive if an input becomes completely used
-            # it doesn't stop from being passed to the output
-            for outputContour in outputContours:
-                outputContour.reCurveFromInputContourSegments(inputContour)
-        # curve fit
+    resultContours = pyClipper.clipExecute([subjectInputContour.originalFlat for subjectInputContour in subjectInputContours],
+                                           [clipInputContour.originalFlat for clipInputContour in clipInputContours],
+                                           operation, subjectFillType="noneZero", clipFillType="noneZero")
+    # convert to output contours
+    outputContours = [OutputContour(contour) for contour in resultContours]
+    # re-curve entire contour
+    for inputContour in inputContours:
         for outputContour in outputContours:
-            outputContour.reCurveSubSegments(inputContours)
-        # output the results
+            if outputContour.final:
+                continue
+            if outputContour.reCurveFromEntireInputContour(inputContour):
+                # the input is expired if a match was made,
+                # so stop passing it to the outputs
+                break
+    # re-curve segments
+    for inputContour in inputContours:
+        # skip contours that were comppletely used in the previous step
+        if inputContour.used:
+            continue
+        # XXX this could be expensive if an input becomes completely used
+        # it doesn't stop from being passed to the output
         for outputContour in outputContours:
-            outputContour.drawPoints(outPen)
-        return outputContours
+            outputContour.reCurveFromInputContourSegments(inputContour)
+    # curve fit
+    for outputContour in outputContours:
+        outputContour.reCurveSubSegments(inputContours)
+    # output the results
+    for outputContour in outputContours:
+        outputContour.drawPoints(outPen)
+    return outputContours
+
+
+class BooleanOperationManager(object):
 
-    def union(self, contours, outPen):
-        return self._performOperation("union", contours, [], outPen)
+    @staticmethod
+    def union(contours, outPen):
+        return _performOperation("union", contours, [], outPen)
 
-    def difference(self, subjectContours, clipContours, outPen):
-        return self._performOperation("difference", subjectContours, clipContours, outPen)
+    @staticmethod
+    def difference(subjectContours, clipContours, outPen):
+        return _performOperation("difference", subjectContours, clipContours, outPen)
 
-    def intersection(self, subjectContours, clipContours, outPen):
-        return self._performOperation("intersection", subjectContours, clipContours, outPen)
+    @staticmethod
+    def intersection(subjectContours, clipContours, outPen):
+        return _performOperation("intersection", subjectContours, clipContours, outPen)
 
-    def xor(self, subjectContours, clipContours, outPen):
-        return self._performOperation("xor", subjectContours, clipContours, outPen)
+    @staticmethod
+    def xor(subjectContours, clipContours, outPen):
+        return _performOperation("xor", subjectContours, clipContours, outPen)
 
-    def getIntersections(self, contours):
+    @staticmethod
+    def getIntersections(contours):
         from flatten import _scalePoints, inverseClipperScale
         # prep the contours
         inputContours = [InputContour(contour) for contour in contours if contour and len(contour) > 1]