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POHow to rotate the hands of clock for the 24 hour clock?
 

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  1. POHow to rotate the hands of clock for the 24 hour clock?
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    <p>I am working on a clock project, i know how to implement hands (Hour, Minute, Seconds) rotation of 12 hour clock. The code i have used is follows</p> <pre><code>CGFloat secAngle,minAngle,hourAngle; NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:[NSDate date]]; NSInteger seconds = [dateComponents second]; NSInteger minutes = [dateComponents minute]; NSInteger hours = [dateComponents hour]; if (timeFormat == 12)//12 hour clock { if (hours &gt; 12) hours -=12; //PM secAngle = Degrees2Radians(seconds/60.0*360); minAngle = Degrees2Radians(minutes/60.0*360); hourAngle = Degrees2Radians(hours/12.0*360) + minAngle/12.0; //secHand.transform = CATransform3DMakeRotation (secAngle+M_PI, 0, 0, 1); minHand.transform = CATransform3DMakeRotation (minAngle+M_PI, 0, 0, 1); hourHand.transform = CATransform3DMakeRotation (hourAngle+M_PI, 0, 0, 1); } else //24 hour clock { secAngle = Degrees2Radians(seconds/60.0*360); minAngle = Degrees2Radians(minutes/60.0*360); hourAngle = (30 * hours + minutes / 2) /2; //secHand.transform = CATransform3DMakeRotation(secAngle * M_PI / 180,0,0,1); minHand.transform = CATransform3DMakeRotation(minAngle * M_PI ,0,0,1); hourHand.transform = CATransform3DMakeRotation(hourAngle * M_PI,0,0,1); } </code></pre> <p>But when i try to implement the 24 hour clock. It is not working. Each time when i run this project the clock shows wrong timings. </p> <p>Can anyone tell me what wrong do i did. Many thanks in advance</p>
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    1. PTQuestion
    1. USMax MacLeod
    1. USsurendher
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      1. LTLinked
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    1. COCan you give some examples of how the code is wrong? e.g. at a given time real time, it shows this wrong time
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      1. POHow to rotate the hands of clock for the 24 hour clock?
      1. USColin Cassidy
    2. COHow did you come up with the formula for `hourAngle` in the 24-hour case? Why doesn't it look anything like the formula in the 12-hour case? Don't you think the 24-hour formula should be similar to the 12-hour formula, with an extra factor of 2 in it somewhere?
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      1. POHow to rotate the hands of clock for the 24 hour clock?
      1. USrob mayoff
    3. COWouldn't the function for calculating 24 hour angle be the same as calculating the hour angle for 12, just switched to 24 instead of hours/12
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      1. POHow to rotate the hands of clock for the 24 hour clock?
      1. USCBredlow
 

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