Canvas MapStructure: Difference between revisions

Canvas MapStructure (view source)

899 bytes added , 4 October 2015

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 This section will cover the main steps for implementing a new layer whose purpose is showing all targets of a selectable [[Tutorials|tutorial]] on a Canvas/MapStructure map.
-For starters, we need to take a look at $FG_ROOT/Nasal/tutorial/tutorial.nas to see how to get a list of targets:
+For starters, we need to take a look at $FG_ROOT/Nasal/tutorial/tutorial.nas to see how to get a list of tutorials, so we open the corresponding file and search for '''tutorials''' and see this:
+<syntaxhighlight lang="nasal">
+tutorialN = nil;
+        foreach (var c; props.globals.getNode("/sim/tutorials").getChildren("tutorial")) {
+                if (c.getNode("name").getValue() == name) {
+                        tutorialN = c;
+                        break;
+                }
+        }
+</syntaxhighlight>
+As can be seen, this requires only a single variable: '''name''' - so we can easily turn this into a helper function:
+<syntaxhighlight lang="nasal">
+var getTutorialNode = func(name) {
+var tutorialN = nil;
+        foreach (var c; props.globals.getNode("/sim/tutorials").getChildren("tutorial")) {
+                if (c.getNode("name").getValue() == name) {
+                        tutorialN = c;
+                        return tutorialN;
+                }
+        }
+return nil;
+}
+</syntaxhighlight>
 == Diagnostics ==