Added exampes for dir-dif

Author: StephenCzarnecki

examples/direct_diffuse_local_file.py

@@ -0,0 +1,20 @@
+import pywincalc
+
+# Load solid layer measured values.  Solid layer information can come from either igsdb.lbl.gov or files generate
+# by the Optics program.  Since igsdb.lbl.gov requires registration some optics files are provided for example
+# purposes
+product_path = "products/sample_dir_dif.txt"
+product = pywincalc.parse_optics_file(product_path)
+
+solid_layers = [product]
+
+# Create a glazing system.  This only shows an example of getting one result from a glazing system
+# created using default environmental conditions.
+#
+# For more possible results see optical_results_NFRC.py
+#
+# For more on environmental conditions see environmental_conditions_user_defined.py
+glazing_system = pywincalc.GlazingSystem(solid_layers=solid_layers)
+
+u_value = glazing_system.u()
+print("U-value for a single-layer system with a direct-diffuse layer: {v}".format(v=u_value))