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2014/10/15 ¤U¤È 10:04:01
iphone Programming Glossary: asinWhy am I getting 0 degrees from magneticField property the whole time? http://stackoverflow.com/questions/11711646/why-am-i-getting-0-degrees-from-magneticfield-property-the-whole-time double y motionManager.deviceMotion.magneticField.field.y double degrees asin y sqrt pow x 2.0 pow y 2.0 180.0 M_PI int degreesRounded int degrees NSLog @ Degrees i degreesRounded iphone objective..
Using quaternion instead of roll, pitch and yaw to track device motion http://stackoverflow.com/questions/19239482/using-quaternion-instead-of-roll-pitch-and-yaw-to-track-device-motion NSError error CMQuaternion quat self.motionManager.deviceMotion.attitude.quaternion double tempYaw radiansToDegrees asin 2 quat.x quat.y quat.w quat.z double tempRoll radiansToDegrees atan2 2 quat.y quat.w quat.x quat.z 1 2 quat.y quat.y 2 quat.z..
how to calculate two coordinates distance in objective c? http://stackoverflow.com/questions/1980898/how-to-calculate-two-coordinates-distance-in-objective-c self rad lat1 double radLat2 self rad lat2 double a radLat1 radLat2 double b self rad lng1 self rad lng2 double s 2 asin sqrt pow sin a 2 2 cos radLat1 cos radLat2 pow sin b 2 2 s s EARTH_RADIUS s round s 10000 10000 return s double rad double..
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 fromCoord.latitude double fromLonRadians self radiansFromDegrees fromCoord.longitude double toLatRadians asin sin fromLatRadians cos distanceRadians cos fromLatRadians sin distanceRadians cos bearingRadians double toLonRadians fromLonRadians..
How to crop the image in iPhone http://stackoverflow.com/questions/7950719/how-to-crop-the-image-in-iphone uint8_t calloc m_wint m_hint sizeof uint32_t 1 for int y 0 y m_hint y new m_hint here float fy y double yy m_height asinf m_height 2 R asin m_height 2 fy R 2 asin m_height 2 R xx yy coordinates of pixel of OLD image for int x 0 x m_wint x new.. m_hint sizeof uint32_t 1 for int y 0 y m_hint y new m_hint here float fy y double yy m_height asinf m_height 2 R asin m_height 2 fy R 2 asin m_height 2 R xx yy coordinates of pixel of OLD image for int x 0 x m_wint x new m_wint here float.. 1 for int y 0 y m_hint y new m_hint here float fy y double yy m_height asinf m_height 2 R asin m_height 2 fy R 2 asin m_height 2 R xx yy coordinates of pixel of OLD image for int x 0 x m_wint x new m_wint here float fx x double xx m_width..
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