ActionScript 2.0 :: X, Y To GPS - Convert A Decimal Value (like 10.25) Back To Degrees And Hours?
Apr 18, 2006
if I have a map of say, Wisconsin, and I know what the Latitude coords (degrees, hours, minutes) of the top and bottom of the map, and I know how many pixels tall the map is, then I should be able to convert, with math, degrees:hours:mins to pixels. (same thing with longitude, but lets just focus on one way first)
I would first find out how may hours (minutes would be over kill for my app) there are to a pixel. Thats pretty easy. But this gives me a decimal number. How do i convert a decimal value (like 10.25) back to degrees and hours (in other words, how do i make .25 a "60" based value)? Ultimately, i want the user to be able to input coords in the form of degrees, hours, mins. Then convert that to X, Y (to place a marker on the map).
Has any one had experience with this or know how to do this?
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Putting the slope of the blue line into tan^-1() would give a value of about 80 degrees, while the red line would calculate to about -50 degrees. The rotation property Flash uses rotates objects clockwise and can range from 0-360. Using the -90 to 90 values and figuring out if the rise and run of the slope are positive or negative, I can determine which quadrant the line is in and calculate the degrees.
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