2014/10/15 下午 10:07:09

iphone Programming Glossary: distances

Drag UIView around Shape Comprised of CGMutablePaths

http://stackoverflow.com/questions/13664615/drag-uiview-around-shape-comprised-of-cgmutablepaths

return hypotf point.x proposedHandlePoint.x point.y proposedHandlePoint.y You could speed things up by using squared distances to avoid the square roots that hypotf is computing. One more tiny detail the index into the points array needs to wrap around..

Sorting an array of doubles or CLLocationDistance values on the iPhone

http://stackoverflow.com/questions/1422840/sorting-an-array-of-doubles-or-cllocationdistance-values-on-the-iphone

first converted the values to NSString objects so that I could use the following sort NSArray sortedArray sortedArray distances sortedArrayUsingSelector @selector caseInsensitiveCompare NSString cannot sort on the numeric value. How can I set a list..

iOS Autolayout - How to set two different distances between views, depends on the screen height

http://stackoverflow.com/questions/15744287/ios-autolayout-how-to-set-two-different-distances-between-views-depends-on-th

Autolayout How to set two different distances between views depends on the screen height I know I'm missing something because this has to be something easy to achieve...

What tool or technology does Apple use to create its documentation?

http://stackoverflow.com/questions/1930755/what-tool-or-technology-does-apple-use-to-create-its-documentation

also allows the Table of Contents to be generated automatically. With quite a bit of effort in tweaking single pixel distances via a CSS style sheet it is or at least was at the time a nearly pixel perfect emulation of the HTML documentation supplied..

Corelocation incorrect distances

http://stackoverflow.com/questions/3093919/corelocation-incorrect-distances

incorrect distances I am developing an application which computes the distance traveled by the user. I am using CLLocationManager class to..

iphone accelerometer speed and distance

http://stackoverflow.com/questions/3177199/iphone-accelerometer-speed-and-distance

Getting displacement from accelerometer data with Core Motion

http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion

approaches and ended up with poor results. I am sure that there won't be an acceptable solution for either larger distances or slow motions lasting for more than 1 or 2 seconds. If you can live with some restrictions like small distances 10 cm.. distances or slow motions lasting for more than 1 or 2 seconds. If you can live with some restrictions like small distances 10 cm and a given minimum velocity for your motions then I believe there might be the chance to find a solution no guarantee..

Measuring time the vehicle takes to accelerate in iPhone

http://stackoverflow.com/questions/4654864/measuring-time-the-vehicle-takes-to-accelerate-in-iphone

Applying Zoom Effect In cocos2D gaming environment?

http://stackoverflow.com/questions/5919180/applying-zoom-effect-in-cocos2d-gaming-environment

previousLocationTwo.x 2.0f pow previousLocationOne.y previousLocationTwo.y 2.0f Get the delta of the distances. CGFloat distanceDelta currentDistance previousDistance Next position the camera to the middle of the pinch. Get the middle..

How to get angle between two POI?

http://stackoverflow.com/questions/6140045/how-to-get-angle-between-two-poi

d radius c return d Another option is to pretend you are on cartesian coordinates faster but not without error on long distances float angleFromCoordinate CLLocationCoordinate2D first toCoordinate CLLocationCoordinate2D second float deltaLongitude..

track small movements of iphone with no GPS

http://stackoverflow.com/questions/6158176/track-small-movements-of-iphone-with-no-gps

position without ever using GPS. That is I can only use data provided by the gyroscope and the accelerometer. The distances I need to measure are rather small and the precision I'm looking for is 40 50cm ~2 feet at the very most. Is this possible..

Calculate new coordinate x meters and y degree away from one coordinate

http://stackoverflow.com/questions/6633850/calculate-new-coordinate-x-meters-and-y-degree-away-from-one-coordinate

toLonRadians return result In the JS code it contains this link which shows a more accurate calculation for distances greater than 1 4 of the Earth's circumference. Also note the above code accepts distance in km so be sure to divide meters..

Need to find Distance using Gyro+Accelerometer

http://stackoverflow.com/questions/6647314/need-to-find-distance-using-gyroaccelerometer

displacement you just do dl sqrt dx dx dy dy dz dz Gyroscope is not necessary for this but if you are measuring linear distances you can use the gyroscope reading to control that rotation of the device was not too large. If rotation was too strong make..

Help calculating X and Y from Latitude and Longitude in iPhone

http://stackoverflow.com/questions/6852195/help-calculating-x-and-y-from-latitude-and-longitude-in-iphone

this question I would do this by assuming flat earth approximation and use vector algebra to relate angles and distances in the lat lon space to the x y pixel space. For example I am assuming you know the lat lon for the bottom left and bottom..

GPS coordinates in degrees to calculate distances

http://stackoverflow.com/questions/6994101/gps-coordinates-in-degrees-to-calculate-distances

coordinates in degrees to calculate distances On the iPhone I get the user's location in decimal degrees for example latitude 39.470920 and longitude 0.373192 That's..

iphone — convert MKMapPoint distances to meters

http://stackoverflow.com/questions/7395925/iphone-convert-mkmappoint-distances-to-meters

&mdash convert MKMapPoint distances to meters Say I have a square which consists of four CLLocationCoordinate2D points which are in lat lon and I want to find..

What's the difference between frame and layout in Interface builder's size inspector?

http://stackoverflow.com/questions/914102/whats-the-difference-between-frame-and-layout-in-interface-builders-size-inspe

the difference iphone interface builder share improve this question When lining controls up and measuring their distances from each other it's often desirable to think about the controls' locations in terms of the visual space they occupy on..