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2014/10/15 ¤U¤È 10:04:07
iphone Programming Glossary: atanobtaining the rotation and size of a UIImageView based on its transformation matrices http://stackoverflow.com/questions/1379811/obtaining-the-rotation-and-size-of-a-uiimageview-based-on-its-transformation-mat A cos A We can use this with the first row of the matrix to conclude that tan R Sx.sin R Sx.cos R b a and therefore R atan b a And now we know R we can extract the scale factors by using the main diagonal a Sx.cos R and therefore Sx a cos R d..
iPhone 4 Camera Specifications - Field of View / Vertical-Horizontal Angle http://stackoverflow.com/questions/3594199/iphone-4-camera-specifications-field-of-view-vertical-horizontal-angle mm tall referenced to landscape mode then half that is 1.695 mm. Focal length for the iPhone 4 is listed as 3.85 mm. atan 1.695 3.85 is 23.75 degrees from center to top or 47.5 degrees top to bottom. For the longer dimension 4.52 2 2.26 mm atan.. 1.695 3.85 is 23.75 degrees from center to top or 47.5 degrees top to bottom. For the longer dimension 4.52 2 2.26 mm atan 2.26 3.85 30.41 center to side or 60.8 degrees left to right again referencing with respect to landscape orientation . So.. the newer iPhone 4S back camera is listed as 4.28 mm but with the same sensor dimensions as the older iPhone 4. So 2 atan 2.26 4.28 55.7 degrees by 2 atan 1.695 4.28 43.2 degrees or roughly a 4 to 5 degree smaller field of view compared with..
iPhone SDK - get/calculate camera field of view (FOV) (Augmented Reality) http://stackoverflow.com/questions/3643075/iphone-sdk-get-calculate-camera-field-of-view-fov-augmented-reality
http://stackoverflow.com/questions/4894923/augmented-reality-movement heading updates from the location manager. Calculate the angle from your position to the position of each object using atan. You will find this method if you google augmented reality atan but it's only highschool math. Find the field view of your.. your position to the position of each object using atan. You will find this method if you google augmented reality atan but it's only highschool math. Find the field view of your camera. For the iPhone 3 it is 35.5 and 53. If your angle is..
Point to location using compass http://stackoverflow.com/questions/5092845/point-to-location-using-compass y2 annLongitude floatValue float dx x2 x1 float dy y2 y1 if dx 0 if dy 0 result 90 else result 270 else result atan dy dx 180 M_PI if dx 0 result result 180 if result 0 result result 360 The true and the magnetic heading is retrieved like..
How do i get arctan MATH function in iphone SDK? http://stackoverflow.com/questions/5339595/how-do-i-get-arctan-math-function-in-iphone-sdk
How to get angle between two POI? http://stackoverflow.com/questions/6140045/how-to-get-angle-between-two-poi float a pow sin dLat 2 2 cos first.coordinate.latitude cos second.coordinate.latitude pow sin dLon 2 2 float c 2 atan2 sqrt a sqrt 1 a float d radius c return d Another option is to pretend you are on cartesian coordinates faster but not.. second.longitude first.longitude float deltaLatitude second.latitude first.latitude float angle M_PI .5f atan deltaLatitude deltaLongitude if deltaLongitude 0 return angle else if deltaLongitude 0 return angle M_PI else if deltaLatitude..
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