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--- doc:user:geometry:user:points [2015/01/07 10:46] – [Example] boman
+++ doc:user:geometry:user:points [2016/03/30 15:23] (current) – external edit 127.0.0.1
@@ Line 3: / Line 3: @@
 ===== Definition =====
-Defining the geometry is a significant step. Indeed, in Metafor, most commands are applied on geometric entities, and not on the mesh itself. Therefore, the [[doc:user:general:glossaire#data set|data sets]] are easy to parametrize, since the number of mesh is not taken into account in the writing of boundary conditions.
+Geometrical ''Points'' (e.g. vertices) are created thanks to an object called ''PointSet'' of the ''Geometry'' using the member function ''define()''. Once created, they are stored in the ''PointSet''.
+''Points'' are the geometrical entities of the lowest level. They are used to define later [[Courbes]].
-''Points'' are the most basic entities. It is from the ''Points'' that most ''[[doc:user:geometry:user:courbes]]'' are defined.
   pt = pointset.define(number, x, y [, z])
-| ''number'' | user number of the point (must be unique and $\geq 1$) |
+with
-| ''x'', ''y'', ''z'' | coordinates of this point ($z=0$ by default) |
+| ''number''          | user number (unique among Points and $\ge 1$)  |
+| ''x'', ''y'', ''z'' | coordinates of this point ($z=0$ by default)   |
 ===== Example =====
-definition of the 4 vertices of a square of length $L$:
+Definition of the 4 vertices of a square of length $L=5$. The python variable $L$ is used here to parametrize the positions of the points.
   L=5
@@ Line 23: / Line 23: @@
   p3 = pointset.define(3, L, L)
   p4 = pointset.define(4, 0, L)
-===== Note =====
+The following command prints the created points as a list:
+  print pointset
+which produces the following output:
+  PointSet        of size 4 (hash=off)
+      Point #1 nDB=[1] (pos in DB) p=[0 0 0]
+      Point #2 nDB=[2] (pos in DB) p=[5 0 0]
+      Point #3 nDB=[3] (pos in DB) p=[5 5 0]
+      Point #4 nDB=[4] (pos in DB) p=[0 5 0]
+===== Note  =====
+{{:doc:user:ico-advanced.png?40 |}}
 Temporary points can be used to define ''[[doc:user:geometry:user:axes]]'' or ''[[doc:user:geometry:user:triedres]]'':
-  pt0 = Point(0, 1, 0, 0)
+  pt = Point(1, x, y, z)
-Since this point was not defined using ''pointset.define'', it will not be found in the ''pointset'', but only in the object that it will help create (''[[axes|Axe]]'' or ''[[triedres|Trièdre]]'') .
+Since this Point was not defined using ''pointset.define()'', it will not be found in the ''PointSet''.