2014/10/15 下午 10:15:44

iphone Programming Glossary: velocity

http://stackoverflow.com/questions/1994018/measuring-velocity-via-iphone-sdk

velocity via iPhone SDK I need to implement a native iPhone app to measure the velocity of the phone basically a speedometer . I.. velocity via iPhone SDK I need to implement a native iPhone app to measure the velocity of the phone basically a speedometer . I know that you can do so via the CoreLocation API fairly easily but I am concerned.. it should be possible to do this but seems extremely complicated and error prone. Translating from acceleration to velocity can be tricky to begin with plus the iPhone accelerometer data can be noisy . I'm familiar with the SDK example that demonstrates..

How to detect iPhone movement in space using accelerometer?

http://stackoverflow.com/questions/2674717/how-to-detect-iphone-movement-in-space-using-accelerometer

and z and get the movement acceleration. 4 Then I integrate this acceleration value with respect to time so I get the velocity. 5 I integrate this velocity again with respect to time and find a position. All of the below code is into the accelerometer.. 4 Then I integrate this acceleration value with respect to time so I get the velocity. 5 I integrate this velocity again with respect to time and find a position. All of the below code is into the accelerometer didAccelerate delegate of.. acceleration.y gravity.y gravityNorm filteredAcceleration.z acceleration.z gravity.z gravityNorm Calculating velocity related to time interval velocity.x velocity.x filteredAcceleration.x interval velocity.y velocity.y filteredAcceleration.y..

Getting displacement from accelerometer data with Core Motion

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

in some istant with known time difference . Looking some other answers it seems like I have to integrate twice to get velocity from acceleration and then position from velocity. But there is no example in code whatsoever and I don't think that is.. some other answers it seems like I have to integrate twice to get velocity from acceleration and then position from velocity. But there is no example in code whatsoever and I don't think that is really necessary. Also there is the problem that when.. 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 at all. If so it will take you..

Measuring time the vehicle takes to accelerate in iPhone

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

distance share improve this question You can use the acceleration values from the accelerometer to measure the velocity. There is really good paper Implementing Positioning Algorithms Using Accelerometers which explains the errors you get from.. Algorithms Using Accelerometers which explains the errors you get from the accelerometer and the techniques to get the velocity and position from the acceleration values. To get the time the vehicle takes to accelerate from 0 to 100 km h you have to.. the time the vehicle takes to accelerate from 0 to 100 km h you have to measure the time until you reached a certain velocity. The main steps you have to take to get the velocity from the acceleration values are get the acceleration values integrate..

cocos2d-iOS - Gesture recognisers

http://stackoverflow.com/questions/4985917/cocos2d-ios-gesture-recognisers

UIGestureRecognizerStateEnded case UIGestureRecognizerStateCancelled do something when the pan ends the below gets the velocity good for letting player fling things v recognizer velocityInView CCDirector sharedDirector .openGLView break share improve..

Simple gun in cocos2d+box2d game

http://stackoverflow.com/questions/9164146/simple-gun-in-cocos2dbox2d-game

touch move stopped ball flew . I make detection and rotation of gun but I can't make popping of ball. How can I count velocity which I need to set to the ball Thank you very much iphone ios cocos2d box2d box2d iphone share improve this question..