Math and Numbers A couple of tips on dealing with math in Director.JavaScript Math If Lingo doesn't have a particular math function you needarcSin, for instanceyou can use JavaScript's math library. Simply create a new movie script and set its type to JavaScript, instead of Lingo. You can then create your own math function in JS like so: function arcSin (num) { return Math.asin(num); } function arcCos (num) { return Math.acos(num); }
Once created, the functions can be called like any method, even from within Lingo: on test num as = arcSin(num) trace(as) end
Integer Numbers Here is a question that repeatedly appears in the newsgroups: Why do certain calculations produce incorrect results? The answer is always the same: you're doing integer math, and Director rounds integers. Use floats instead.Look at this example from the Message window: trace(21 / 5) -- 4
To get the correct result turn one of the numbers into a floating-point, or real, number: trace(21 / 5.0) -- 4.2000
Or use the float method: trace(21 / float(5)) -- 4.2000
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