Draft: DraftVecUtils.py clean up imports and messages

Small spacing fixes like imports in separate lines
for more clarity, and the position of the license.
Also use the new `messages` module to provide the functions
to print text to the console.
Also use `Matrix` prefixed by the `FreeCAD` module.

src/Mod/Draft/DraftVecUtils.py

@@ -1,19 +1,3 @@
-## \defgroup DRAFTVECUTILS DraftVecUtils
-#  \ingroup UTILITIES
-#  \brief Vector math utilities used in Draft workbench
-#
-# Vector math utilities used primarily in the Draft workbench
-# but which can also be used in other workbenches and in macros.
-"""\defgroup DRAFTVECUTILS DraftVecUtils
-\ingroup UTILITIES
-\brief Vector math utilities used in Draft workbench
-
-Vector math utilities used primarily in the Draft workbench
-but which can also be used in other workbenches and in macros.
-"""
-# Check code with
-# flake8 --ignore=E226,E266,E401,W503
-
 # ***************************************************************************
 # *   Copyright (c) 2009, 2010 Yorik van Havre <yorik@uncreated.net>        *
 # *   Copyright (c) 2009, 2010 Ken Cline <cline@frii.com>                   *
@@ -35,18 +19,31 @@
 # *   USA                                                                   *
 # *                                                                         *
 # ***************************************************************************
+"""Provide vector math utilities used in the Draft workbench.
 
-__title__ = "FreeCAD Draft Workbench - Vector library"
-__author__ = "Yorik van Havre, Werner Mayer, Martin Burbaum, Ken Cline"
-__url__ = "https://www.freecadweb.org"
+Vector math utilities used primarily in the Draft workbench
+but which can also be used in other workbenches and in macros.
+"""
+## \defgroup DRAFTVECUTILS DraftVecUtils
+#  \ingroup UTILITIES
+#  \brief Vector math utilities used in Draft workbench
+#
+# Vector math utilities used primarily in the Draft workbench
+# but which can also be used in other workbenches and in macros.
 
-## \addtogroup DRAFTVECUTILS
-#  @{
+# Check code with
+# flake8 --ignore=E226,E266,E401,W503
 
+import math
 import sys
-import math, FreeCAD
-from FreeCAD import Vector, Matrix
-from FreeCAD import Console as FCC
+
+import FreeCAD
+from FreeCAD import Vector
+import draftutils.messages as messages
+
+__title__ = "FreeCAD Draft Workbench - Vector library"
+__author__ = "Yorik van Havre, Werner Mayer, Martin Burbaum, Ken Cline"
+__url__ = "https://www.freecadweb.org"
 
 # Python 2 has two integer types, int and long.
 # In Python 3 there is no 'long' anymore, so make it 'int'.
@@ -57,6 +54,9 @@
 
 params = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Draft")
 
+## \addtogroup DRAFTVECUTILS
+#  @{
+
 
 def precision():
     """Get the number of decimal numbers used for precision.
@@ -97,16 +97,15 @@ def typecheck(args_and_types, name="?"):
         Defaults to `'?'`. The name of the check.
 
     Raises
-    -------
+    ------
     TypeError
         If the first element in the tuple is not an instance of the second
         element.
     """
     for v, t in args_and_types:
         if not isinstance(v, t):
-            _msg = ("typecheck[" + str(name) + "]: "
-                    + str(v) + " is not " + str(t) + "\n")
-            FCC.PrintWarning(_msg)
+            _msg = "typecheck[{0}]: {1} is not {2}".format(name, v, t)
+            messages._wrn(_msg)
             raise TypeError("fcvec." + str(name))
 
 
@@ -208,7 +207,7 @@ def equals(u, v):
         The second vector.
 
     Returns
-    ------
+    -------
     bool
         `True` if the vectors are within the precision, `False` otherwise.
     """
@@ -497,9 +496,9 @@ def rotate(u, angle, axis=Vector(0, 0, 1)):
     ys = y * s
     zs = z * s
 
-    m = Matrix(c + x*x*t,   xyt - zs,   xzt + ys,   0,
-               xyt + zs,    c + y*y*t,  yzt - xs,   0,
-               xzt - ys,    yzt + xs,   c + z*z*t,  0)
+    m = FreeCAD.Matrix(c + x*x*t,   xyt - zs,   xzt + ys,   0,
+                       xyt + zs,    c + y*y*t,  yzt - xs,   0,
+                       xzt - ys,    yzt + xs,   c + z*z*t,  0)
 
     return m.multiply(u)
 
@@ -547,7 +546,7 @@ def getRotation(vector, reference=Vector(1, 0, 0)):
 
 
 def isNull(vector):
-    """Returns `False` if each of the components of the vector is zero.
+    """Return False if each of the components of the vector is zero.
 
     Due to rounding errors, an element is probably never going to be
     exactly zero. Therefore, it rounds the element by the number