Moved 'drawPoints' from gears.py and pulley.py into Boxes main class

This move makes it easier to use Cartesian points directly.

I tested both the gearbox and rotary generators (with default settings) to ensure that they both still work.

boxes/__init__.py

@@ -39,6 +39,7 @@ from boxes import parts
 from boxes import pulley
 from boxes import svgutil
 from boxes.Color import *
+from boxes.vectors import kerf
 
 import qrcode
 from boxes.qrcode_factory import BoxesQrCodeFactory
@@ -1560,6 +1561,24 @@ class Boxes:
                           y * 0.5 * holedistance,
                           0.5 * diameter)
 
+    def drawPoints(self, lines, kerfdir=1, close=True):
+
+        if not lines:
+            return
+
+        if kerfdir != 0:
+            lines = kerf(lines, self.burn*kerfdir, closed=close)
+
+        self.ctx.save()
+        self.ctx.move_to(*lines[0])
+
+        for x, y in lines[1:]:
+            self.ctx.line_to(x, y)
+
+        if close:
+            self.ctx.line_to(*lines[0])
+        self.ctx.restore()
+
     def qrcode(self, content, box_size=1.0, color=Color.ETCHING, move=None):
         q = qrcode.QRCode(image_factory=BoxesQrCodeFactory, box_size=box_size*10)
         q.add_data(content)

boxes/gears.py

@@ -385,24 +385,6 @@ class Gears():
                                      dest="undercut_alert", default=False,
                                      help="Let the user confirm a warning dialog if undercut occurs. This dialog also shows helpful hints against undercut")
 
-    def drawPoints(self, lines, kerfdir=1, close=True):
-
-        if not lines:
-            return
-
-        if kerfdir != 0:
-            lines = kerf(lines, self.boxes.burn*kerfdir, closed=close)
-
-        self.boxes.ctx.save()
-        self.boxes.ctx.move_to(*lines[0])
-
-        for x, y in lines[1:]:
-            self.boxes.ctx.line_to(x, y)
-
-        if close:
-            self.boxes.ctx.line_to(*lines[0])
-        self.boxes.ctx.restore()
-
     def calc_circular_pitch(self):
         """We use math based on circular pitch."""
         dimension = self.options.dimension
@@ -628,8 +610,8 @@ class Gears():
             self.boxes.moveTo(width/2.0, base_height+addendum, -180)
             if base_height < 0:
                 points = points[1:-1]
-            self.drawPoints(points, close=base_height >= 0)
-            self.drawPoints(guide_points, kerfdir=0)
+            self.boxes.drawPoints(points, close=base_height >= 0)
+            self.boxes.drawPoints(guide_points, kerfdir=0)
             self.boxes.move(width, height, move)
 
             return
@@ -660,7 +642,7 @@ class Gears():
         if not teeth_only:
             self.boxes.moveTo(width/2, height/2)
         self.boxes.cc(callback, None, 0, 0)
-        self.drawPoints(points)
+        self.boxes.drawPoints(points)
         # Spokes
         if not teeth_only and not self.options.internal_ring:  # only draw internals if spur gear
             msg = self.generate_spokes(root_radius, spoke_width, spoke_count, mount_radius, mount_hole,

boxes/pulley.py

@@ -86,18 +86,6 @@ class Pulley:
     def getProfiles(cls):
         return list(sorted(cls.teeth.keys()))
 
-    def drawPoints(self, lines, kerfdir=1):
-        if kerfdir != 0:
-            lines = kerf(lines, self.boxes.burn * kerfdir)
-        self.boxes.ctx.save()
-        self.boxes.ctx.move_to(*lines[0])
-
-        for x, y in lines[1:]:
-            self.boxes.ctx.line_to(x, y)
-
-        self.boxes.ctx.line_to(*lines[0])
-        self.boxes.ctx.restore()
-
     def diameter(self, teeth, profile):
         if self.spacing[profile][0]:
             return tooth_spaceing_curvefit(teeth, *self.spacing[profile][1:])
@@ -149,5 +137,5 @@ class Pulley:
             m = mmul(m, rotm(i * 2 * pi / teeth))
             points.extend(vtransl(pt, m) for pt in self.teeth[profile][1:-1])
 
-        self.drawPoints(points, kerfdir=-1 if insideout else 1)
+        self.boxes.drawPoints(points, kerfdir=-1 if insideout else 1)
         self.boxes.move(total_width, total_width, move)