2014/10/15 下午 10:04:07

iphone Programming Glossary: atan2

http://stackoverflow.com/questions/12091916/uiview-with-a-dashed-line

lineWidth CGPoint center 0.5 a.x b.x 0.5 a.y b.y CGFloat length sqrt a.x b.x a.x b.x a.y b.y a.y b.y CGFloat angle atan2 a.y b.y a.x b.x layer.position center layer.bounds CGRect 0 0 length lineWidth lineWidth layer.transform CATransform3DMakeRotation..

How to rotate and resize the image view with single finger

http://stackoverflow.com/questions/12566791/how-to-rotate-and-resize-the-image-view-with-single-finger

otherwise resizing wouldn't work properly. Second I recommends you to use CGAffineTransformMakeRotation and atan2 functions to solve the rotation problem like this float ang atan2 recognizer locationInView self.superview .y self.center.y.. you to use CGAffineTransformMakeRotation and atan2 functions to solve the rotation problem like this float ang atan2 recognizer locationInView self.superview .y self.center.y recognizer locationInView self.superview .x self.center.x float..

iphone sdk CGAffineTransform getting the angle of rotation of an object

http://stackoverflow.com/questions/2051811/iphone-sdk-cgaffinetransform-getting-the-angle-of-rotation-of-an-object

iPhoneSDK calculate Rotation angle from CATransform3D

http://stackoverflow.com/questions/3565383/iphonesdk-calculate-rotation-angle-from-catransform3d

x' x cos.a y sin.a y' x sin.a y cos.a z' z cos.a sin.a 0 0 sin.a cos.a 0 0 0 0 1 0 0 0 0 1 so angle should be a atan2 transform.m12 transform.m11 Rotation about x axis a angle in radians y' y cos.a z sin.a z' y sin.a z cos.a x' x 1 0 0 0..

CLLocation Category for Calculating Bearing w/ Haversine function

http://stackoverflow.com/questions/3925942/cllocation-category-for-calculating-bearing-w-haversine-function

dLon lon2 lon1 double y sin dLon cos lat2 double x cos lat1 sin lat2 sin lat1 cos lat2 cos dLon double radiansBearing atan2 y x return RadiansToDegrees radiansBearing iphone mapkit core location cllocation haversine share improve this question.. negative bearings add 2 M_PI to the final result in radiansBearing or 360 if you do it after converting to degrees . atan2 returns the result in the range M_PI to M_PI 180 to 180 degrees so you might want to convert it to compass bearings using..

Rotating image using objective C

http://stackoverflow.com/questions/4010779/rotating-image-using-objective-c

touch allTouches allObjects objectAtIndex len CGPoint location touch locationInView self superview float theAngle atan2 location.y self.center.y location.x self.center.x totalRadians theAngle self rotateImage theAngle void touchesEnded NSSet.. touch allTouches allObjects objectAtIndex len CGPoint location touch locationInView self superview float theAngle atan2 location.y self.center.y location.x self.center.x totalRadians fabs theAngle totalRadians totalRadians fmod totalRadians..

iPhone Compass GPS Direction

http://stackoverflow.com/questions/4130821/iphone-compass-gps-direction

float fLng self angleToRadians alon float tLat self angleToRadians blat float tLng self angleToRadians blon float temp atan2 sin tLng fLng cos tLat cos fLat sin tLat sin fLat cos tLat cos tLng fLng double temp2 previousHeading double temp1 temp.. you can use if you are at lat1 lon1 and the point you are interested in is at lat2 lon2 then the equation is heading atan2 sin lon2 lon1 cos lat2 cos lat1 sin lat2 sin lat1 cos lat2 cos lon2 lon1 This gives you a bearing in radians which you can.. . The value is then between 180 and 180 degrees so to get a standard compass bearing add 360 to any negative answers. atan2 is a standard function related to arctan that does the right thing for the four possible quadrants that your destination..

Rotate image on center using one finger touch

http://stackoverflow.com/questions/5468559/rotate-image-on-center-using-one-finger-touch

angle of the rotation is increase so i can not set the value. Can any one help me The code is below float fromAngle atan2 firstLoc.y imageView.center.y firstLoc.x imageView.center.x NSLog @ From angle f fromAngle float toAngle atan2 currentLoc.y.. atan2 firstLoc.y imageView.center.y firstLoc.x imageView.center.x NSLog @ From angle f fromAngle float toAngle atan2 currentLoc.y imageView.center.y currentLoc.x imageView.center.x NSLog @ to Angle f toAngle So the angle to rotate to is.. self.view m_currentAngle self updateRotation location float updateRotation CGPoint _location float fromAngle atan2 m_locationBegan.y m_block.center.y m_locationBegan.x m_block.center.x float toAngle atan2 _location.y m_block.center.y _location.x..

What's the best approach to draw lines between views?

http://stackoverflow.com/questions/5847876/whats-the-best-approach-to-draw-lines-between-views

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

cos distanceRadians cos fromLatRadians sin distanceRadians cos bearingRadians double toLonRadians fromLonRadians atan2 sin bearingRadians sin distanceRadians cos fromLatRadians cos distanceRadians sin fromLatRadians sin toLatRadians adjust..

How to rotate a Direction Arrow to particular location

http://stackoverflow.com/questions/7173925/how-to-rotate-a-direction-arrow-to-particular-location

void calculateUserAngle CLLocationCoordinate2D user NSLog @ my destination is f f fixlocLat fixlocLon degrees degrees atan2 sin fixlocLon user.longitude cos fixlocLat cos user.latitude sin fixlocLat sin user.latitude cos fixlocLat cos fixlocLon..

Detect iPhone screen orientation

http://stackoverflow.com/questions/999686/detect-iphone-screen-orientation

int accelerationY acceleration.y kfilteringFactor accelerationY 1.0 kfilteringFactor float currentRawReading atan2 accelerationY accelerationX 180 M_PI NSLog @ Angle f currentRawReading Sample from log while phone is flat 2009 06 16 17..