On Sep 30, 2008, at 07:29 , Michael Robinson wrote:
Hello, I am trying to convert the following from Javascript to Cocoa ObjC:var retVal = Math.round(cornerSize*(1-Math.cos(Math.asin(i/ cornerSize))));return retVal;Now retVal _must_ be an int, because the value is used as a margin attribute ("rounding" corners of divs).This is what I've got:Variables i, cornerSize are passed to the function from a for loop. i being the counter for the loop, cornerSize being the size of corner desired by the user.float retVal; retVal = cornerSize*(1-cos(asin(i/cornerSize))); return (int)retVal;Obviously, I'm no whiz at ObjC, and the fact that this keeps return '0' has got me stumped.At first I thought it was some stupid mistake I made translating the formula, but I tested a few things and now I'm not so sure.sin(90); returns 0 as well. When I use Apple's Calculator and ask it to tell me the result of sin(90), it gives me 1.What what whaaaaat?
This is happening because the function is returning a value less than zero and your integer is getting truncated. You want to do something like this:
double retVal; retVal = cornerSize*(1-cos(asin(i/cornerSize))); return lround(retVal);(this function should return a long integer--see the man page for lround for other options)
Jason
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