¡@
2014/10/15 ¤U¤È 10:11:20
iphone Programming Glossary: measurementshttp://stackoverflow.com/questions/1059101/font-size-in-pixels will be a bit larger than the font's point size so that lines of text don't crash into each other. If you need exact measurements and you probably do then you'll need to actually measure the font glyphs using the font metric information. You can do this..
Drifting yaw angle after moving fast http://stackoverflow.com/questions/13613239/drifting-yaw-angle-after-moving-fast PS As we are dealing with quaternion based models this is not related to Gimbal Lock EDIT After doing some more measurements it seems clear that only yaw is affected. Pitch and roll show deviations within tolerance 1° while yaw is drifting regardless..
Indoor navigation hardware/software requirements for iOS http://stackoverflow.com/questions/15732181/indoor-navigation-hardware-software-requirements-for-ios very cheap no extra hardware or initial survey phase are needed. UWB very accurate techniques based on time of flight measurements. Requires expensive hardware for both transmitter and receiver. You can achieve cm accuracy with this but it's probably.. but I don't have much details. As for your iPhone question any app that accesses the private API to access Wifi measurements will be rejected by the App store so you won't be able to publish anything that relies on Wifi. You can still use it for..
How to get a volume measurement of iPhone recording in dB, with a limit of at least 120dB http://stackoverflow.com/questions/2548238/how-to-get-a-volume-measurement-of-iphone-recording-in-db-with-a-limit-of-at-le volume meter for the iPhone. I want the volume to be displayed in dB. When using this turorial I am only getting measurements up to 78 dB. I've read that that is because the dBFS spectrum for 16 bit audio recordings is only 96 dB. I tried modifying..
Developing iPhone app to Run on iPad - Auto Set 2x http://stackoverflow.com/questions/2680392/developing-iphone-app-to-run-on-ipad-auto-set-2x
Corelocation incorrect distances http://stackoverflow.com/questions/3093919/corelocation-incorrect-distances the location measurement to determine if the measurement is cached in most cases you will not want to rely on cached measurements NSTimeInterval locationAge newLocation.timestamp timeIntervalSinceNow NSLog @ time d locationAge if locationAge 5.0 return..
http://stackoverflow.com/questions/3841231/custom-progressbar-widget mTexts i LEFT_PADDING i separation int textWidth 2 TOP_PADDING textPaint You'll probably want to do the measurements in onMeasure instead of onDraw and you should probably only measure the width of each string when you change the text or..
C/C++/Obj-C Real-time algorithm to ascertain Note (not Pitch) from Vocal Input http://stackoverflow.com/questions/4062099/c-c-obj-c-real-time-algorithm-to-ascertain-note-not-pitch-from-vocal-input pitch or pitch class. FFT and DFT methods will not directly provide pitch only frequency. Neither will zero crossing measurements work well for human voice sources. Try AMDF ASDF autocorrelation or cepstral methods. There are also plenty of academic..
Battery drain of iPhone while using location services http://stackoverflow.com/questions/4435585/battery-drain-of-iphone-while-using-location-services filters acceptable location timestamps polling intervals etc BUT UIDevice has exactly what you need to make your own measurements UIDevice currentDevice setBatteryMonitoringEnabled YES UIDevice currentDevice batteryLevel UIDevice currentDevice batteryState..
iPhone - What does the gyroscope measures? Can I get an absolute degree measurement in all axis? http://stackoverflow.com/questions/5112536/iphone-what-does-the-gyroscope-measures-can-i-get-an-absolute-degree-measurem thanks iphone core motion share improve this question The iPhone uses accelerometers for its internal angle measurements which means they are relative to the Earth's gravity. That's about as absolute as you're going to get unless you need this..
how to get distance using Wi-Fi http://stackoverflow.com/questions/684781/how-to-get-distance-using-wi-fi fixed receiver your phone doesn't have to be fixed but it is effectively fixed if you're looking for instantaneous measurements a single fixed base station the access point an omnidirectional antenna on the receiver 802.11 b g protocol This cannot..
How to count steps using an Accelerometer? http://stackoverflow.com/questions/8310250/how-to-count-steps-using-an-accelerometer console to focus. What you should do is first rig your app to make some recordings ie write files containing the raw measurements then re rig your app #ifdefs would be handy here to be able to play back those measurements so that you can step through..
iPhone SDK: How do you measure the width and height of a string using Quartz? http://stackoverflow.com/questions/913470/iphone-sdk-how-do-you-measure-the-width-and-height-of-a-string-using-quartz I ask my questions this is from Apple's documentation re how to determine the width of a string using Quartz If text measurements are important to your application it is possible to calculate them using Quartz 2D functions. However you might first consider.. before layout text metrics. Unlike Quartz for which you must perform the calculations yourself ATSUI computes the measurements for you. For example you can obtain the image bounding rectangle for text by calling the ATSUI function ATSUMeasureTextImage...
|