Howto:Coding a simple Nasal Framework: Difference between revisions

Howto:Coding a simple Nasal Framework (view source)

865 bytes added , 27 February 2014

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 == Moving huge conditionals into hash functions ==
+The next problem we want to tackle is getting rid of huge conditional blocks inside the '''update()''' method: {{Git link|gitorious|fg/fgdata|master|Aircraft/747-400/Models/Cockpit/Instruments/PFD/PFD.nas}}
+<syntaxhighlight lang="nasal" line="GESHI_FANCY_LINE_NUMBERS" start="258">
+if(abs(deflection) < 0.5) { # need to verify 0.5
+                locPtr.setTranslation(deflection*300,0);
+                risingRwyPtr.setTranslation(deflection*300,0);
+                locScaleExp.show();
+                locScale.hide();
+            } else {
+                locPtr.setTranslation(deflection*150,0);
+                risingRwyPtr.setTranslation(deflection*150,0);
+                locScaleExp.hide();
+                locScale.show();
+            }
+</syntaxhighlight>
+Such conditionals can be usually spit into:
+* condition (predicate)
+* body if true
+* body if false
 == Configuration ==