add issequence function to data and plot functions and examples for geometry

examples/geometry_lines_circles.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""Example geometry of lines and circles.
+
+:Date: 2019-12-23
+
+.. module:: geometry_pyramidal_frustum
+  :platform: *nix, Windows
+  :synopsis: Example geometry of lines and circles.
+
+.. moduleauthor:: Daniel Weschke <daniel.weschke@directbox.de>
+"""
+import math
+from pylib.geometry import World, Point, Line, Circle
+from pylib.geometry_plot_pylab import cad_wireframe, wireframe3d
+
+def geometry():
+  w = World()
+
+  p0 = Point(0, 0, 0)
+  p = Point(1, 1, 1)
+
+  # add Lines to the Word
+  theta = math.pi/4
+  w.add(*[Line(p0, p.rotate_x(theta/5)) for i in range(30)])
+  w.add(*[Line(p0, p.rotate_x(theta/5)).translate(.1*i, 0, 0) for i in range(30)])
+
+  # add Circles to the Word
+  c1 = Circle()
+  c2 = Circle(2)
+  c3 = Circle(n=18).scale(3).rotate_x(math.pi/4)
+  w.add(c1, c2, c3)
+
+  return w
+
+
+if __name__ == "__main__":
+  w = geometry()
+  print(*w)
+  wireframe3d(w)
+  cad_wireframe(w, False)