Add visualization code to ex_curve04.py

Author: orbingol

curve2d/ex_curve04.py

@@ -9,6 +9,13 @@
 import os
 from geomdl import NURBS
 
+# Try to load the visualization module
+try:
+    render_curve = True
+    from geomdl.visualization import VisMPL
+except ImportError:
+    render_curve = False
+
 # Fix file path
 os.chdir(os.path.dirname(os.path.realpath(__file__)))
 
@@ -27,6 +34,13 @@
 # Evaluate curve
 curve.evaluate()
 
+# Draw the control point polygon and the evaluated curve
+if render_curve:
+    vis_comp = VisMPL.VisCurve2D(plot_ctrlpts=True)
+    vis_comp.figure_size([8, 8])
+    curve.vis = vis_comp
+    curve.render()
+
 # Save control points and evaluated curve points
 curve.save_curvepts_to_csv("curvepts04_orig.csv")
 curve.save_ctrlpts_to_csv("ctrlpts04_orig.csv")