Draft: move functions to draftgeoutils.linear_algebra

src/Mod/Draft/CMakeLists.txt

@@ -40,6 +40,7 @@ SET (Draft_geoutils
     draftgeoutils/arcs.py
     draftgeoutils/fillets.py
     draftgeoutils/offsets.py
+    draftgeoutils/linear_algebra.py
 )
 
 SET(Draft_tests

src/Mod/Draft/DraftGeomUtils.py

@@ -1004,53 +1004,10 @@ def circleFrom3CircleTangents(circle1, circle2, circle3):
         return None
 
 
-def linearFromPoints(p1, p2):
-    """Calculate linear equation from points.
-
-    Calculate the slope and offset parameters of the linear equation of a line defined by two points.
-
-    Linear equation:
-    y = m * x + b
-    m = dy / dx
-    m ... Slope
-    b ... Offset (point where the line intersects the y axis)
-    dx/dy ... Delta x and y. Using both as a vector results in a non-offset direction vector.
-    """
-    if isinstance(p1, Vector) and isinstance(p2, Vector):
-        line = {}
-        line['dx'] = (p2.x - p1.x)
-        line['dy'] = (p2.y - p1.y)
-        line['slope'] = line['dy'] / line['dx']
-        line['offset'] = p1.y - slope * p1.x
-        return line
-    else:
-        return None
+from draftgeoutils.linear_algebra import linearFromPoints
 
 
-def determinant(mat, n):
-    """
-    determinant(matrix,int) - Determinat function. Returns the determinant
-    of a n-matrix. It recursively expands the minors.
-    """
-    matTemp = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]]
-    if (n > 1):
-        if n == 2:
-            d = mat[0][0] * mat[1][1] - mat[1][0] * mat[0][1]
-        else:
-            d = 0.0
-            for j1 in range(n):
-                # Create minor
-                for i in range(1, n):
-                    j2 = 0
-                    for j in range(n):
-                        if j == j1:
-                            continue
-                        matTemp[i-1][j2] = mat[i][j]
-                        j2 += 1
-                d += (-1.0)**(1.0 + j1 + 1.0) * mat[0][j1] * determinant(matTemp, n-1)
-        return d
-    else:
-        return 0
+from draftgeoutils.linear_algebra import determinant
 
 
 def findHomotheticCenterOfCircles(circle1, circle2):

src/Mod/Draft/draftgeoutils/linear_algebra.py

@@ -0,0 +1,84 @@
+# ***************************************************************************
+# *   Copyright (c) 2009, 2010 Yorik van Havre <yorik@uncreated.net>        *
+# *   Copyright (c) 2009, 2010 Ken Cline <cline@frii.com>                   *
+# *                                                                         *
+# *   This file is part of the FreeCAD CAx development system.              *
+# *                                                                         *
+# *   This program is free software; you can redistribute it and/or modify  *
+# *   it under the terms of the GNU Lesser General Public License (LGPL)    *
+# *   as published by the Free Software Foundation; either version 2 of     *
+# *   the License, or (at your option) any later version.                   *
+# *   for detail see the LICENCE text file.                                 *
+# *                                                                         *
+# *   FreeCAD is distributed in the hope that it will be useful,            *
+# *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+# *   GNU Library General Public License for more details.                  *
+# *                                                                         *
+# *   You should have received a copy of the GNU Library General Public     *
+# *   License along with FreeCAD; if not, write to the Free Software        *
+# *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
+# *   USA                                                                   *
+# *                                                                         *
+# ***************************************************************************
+"""Provides various functions for linear algebraic operations.
+
+This includes calculating linear equation parameters, and matrix determinants.
+"""
+## @package linear_algebra
+# \ingroup DRAFTGEOUTILS
+# \brief Provides various functions for linear algebraic operations.
+
+import FreeCAD as App
+
+
+def linearFromPoints(p1, p2):
+    """Calculate linear equation from points.
+
+    Calculate the slope and offset parameters of the linear equation
+    of a line defined by two points.
+
+    Linear equation:
+    y = m * x + b
+    m = dy / dx
+    m ... Slope
+    b ... Offset (point where the line intersects the y axis)
+    dx/dy ... Delta x and y. Using both as a vector results
+    in a non-offset direction vector.
+    """
+    if not isinstance(p1, App.Vector) and not isinstance(p2, App.Vector):
+        return None
+
+    line = {}
+    line['dx'] = (p2.x - p1.x)
+    line['dy'] = (p2.y - p1.y)
+    line['slope'] = line['dy'] / line['dx']
+    line['offset'] = p1.y - line['slope'] * p1.x
+    return line
+
+
+def determinant(mat, n):
+    """Return the determinant of an N-matrix.
+
+    It recursively expands the minors.
+    """
+    matTemp = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0]]
+    if (n > 1):
+        if n == 2:
+            d = mat[0][0] * mat[1][1] - mat[1][0] * mat[0][1]
+        else:
+            d = 0.0
+            for j1 in range(n):
+                # Create minor
+                for i in range(1, n):
+                    j2 = 0
+                    for j in range(n):
+                        if j == j1:
+                            continue
+                        matTemp[i-1][j2] = mat[i][j]
+                        j2 += 1
+                d += ((-1.0)**(1.0 + j1 + 1.0)
+                      * mat[0][j1] * determinant(matTemp, n-1))
+        return d
+    else:
+        return 0