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POCardinal direction algorithm in Java
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copied!<p>This weekend I spend a few minutes thrashing together an algorithm that would take in a heading (in degrees) and return a String for the cardinal direction (I'm using it in an android compass application I'm using). What I ended up with was this:</p> <pre><code>private String headingToString(Float heading) { String strHeading = "?"; Hashtable<String, Float> cardinal = new Hashtable<String, Float>(); cardinal.put("North_1", new Float(0)); cardinal.put("Northeast", new Float(45)); cardinal.put("East", new Float(90)); cardinal.put("Southeast", new Float(135)); cardinal.put("South", new Float(180)); cardinal.put("Southwest", new Float(225)); cardinal.put("West", new Float(270)); cardinal.put("Northwest", new Float(315)); cardinal.put("North_2", new Float(360)); for (String key: cardinal.keySet()) { Float value = cardinal.get(key); if (Math.abs(heading - value) < 30) { strHeading = key; if (key.contains("North_")) { strHeading = "North"; } break; } } return strHeading; } </code></pre> <p>My question is, is this the best way of doing this? It must have been done many times before although I haven't done a search for examples on the web yet. Have any other people tried this and found a neater solution?</p> <p>Edit for The Reverand's Thilo's, shinjin's and Chrstoffer's responses:</p> <p><strong>The Solution</strong></p> <pre><code>public static String headingToString2(double x) { String directions[] = {"N", "NE", "E", "SE", "S", "SW", "W", "NW", "N"}; return directions[ (int)Math.round(( ((double)x % 360) / 45)) ]; } </code></pre>

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