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2014/10/16 ¤W¤È 08:18:40
android Programming Glossary: math.toradiansAndroid Maps API v2 draw circle http://stackoverflow.com/questions/13991301/android-maps-api-v2-draw-circle in km double d radius R radius given in km double lat1 Math.toRadians latLng.latitude double lon1 Math.toRadians latLng.longitude.. km double lat1 Math.toRadians latLng.latitude double lon1 Math.toRadians latLng.longitude PolylineOptions options new PolylineOptions.. new PolylineOptions for int x 0 x 360 x double brng Math.toRadians x double latitudeRad Math.asin Math.sin lat1 Math.cos d Math.cos..
Android - SQlite Getting nearest locations (with latitude and longitude) http://stackoverflow.com/questions/3695224/android-sqlite-getting-nearest-locations-with-latitude-and-longitude double bearing double EarthRadius 6371000 m double latA Math.toRadians point.x double lonA Math.toRadians point.y double angularDistance.. 6371000 m double latA Math.toRadians point.x double lonA Math.toRadians point.y double angularDistance range EarthRadius double trueCourse.. double angularDistance range EarthRadius double trueCourse Math.toRadians bearing double lat Math.asin Math.sin latA Math.cos angularDistance..
Draw A Circle On Android MapView http://stackoverflow.com/questions/5293709/draw-a-circle-on-android-mapview mRadius 1 FloatMath.cos float Math.toRadians mLat Paint innerCirclePaint innerCirclePaint new Paint innerCirclePaint.setColor.. mRadius 1 FloatMath.cos float Math.toRadians mLat Paint innerCirclePaint innerCirclePaint new Paint innerCirclePaint.setColor.. corrected however by multiplying by 1 FloatMath.cos float Math.toRadians mLat which is the only change that I made to Scott's original..
Android Gauge Animation Question http://stackoverflow.com/questions/6156674/android-gauge-animation-question to arc at specified angle p.lineTo width 2 float Math.cos Math.toRadians angleStart width 2 width 2 float Math.sin Math.toRadians angleStart.. Math.toRadians angleStart width 2 width 2 float Math.sin Math.toRadians angleStart width 2 add arc from start angle with specified sweep..
How do I draw an arrowhead (in Android)? http://stackoverflow.com/questions/6713757/how-do-i-draw-an-arrowhead-in-android length double angle int points new int 2 double theta Math.toRadians angle result 0 centerX int length Math.cos theta result 1 centerY..
How to calculate distance between two locations using their longitude and latitude value http://stackoverflow.com/questions/6981916/how-to-calculate-distance-between-two-locations-using-their-longitude-and-latitu distance double earthRadius 3958.75 double dLat Math.toRadians lat1 lat2 double dLng Math.toRadians lng1 lng2 double a Math.sin.. 3958.75 double dLat Math.toRadians lat1 lat2 double dLng Math.toRadians lng1 lng2 double a Math.sin dLat 2 Math.sin dLat 2 Math.cos.. lng2 double a Math.sin dLat 2 Math.sin dLat 2 Math.cos Math.toRadians lat2 Math.cos Math.toRadians lat1 Math.sin dLng 2 Math.sin..
Android Maps API v2 draw circle http://stackoverflow.com/questions/13991301/android-maps-api-v2-draw-circle LatLng latLng double radius double R 6371d earth's mean radius in km double d radius R radius given in km double lat1 Math.toRadians latLng.latitude double lon1 Math.toRadians latLng.longitude PolylineOptions options new PolylineOptions for int x 0 x 360.. earth's mean radius in km double d radius R radius given in km double lat1 Math.toRadians latLng.latitude double lon1 Math.toRadians latLng.longitude PolylineOptions options new PolylineOptions for int x 0 x 360 x double brng Math.toRadians x double.. lon1 Math.toRadians latLng.longitude PolylineOptions options new PolylineOptions for int x 0 x 360 x double brng Math.toRadians x double latitudeRad Math.asin Math.sin lat1 Math.cos d Math.cos lat1 Math.sin d Math.cos brng double longitudeRad lon1..
Android - SQlite Getting nearest locations (with latitude and longitude) http://stackoverflow.com/questions/3695224/android-sqlite-getting-nearest-locations-with-latitude-and-longitude PointF calculateDerivedPosition PointF point double range double bearing double EarthRadius 6371000 m double latA Math.toRadians point.x double lonA Math.toRadians point.y double angularDistance range EarthRadius double trueCourse Math.toRadians bearing.. PointF point double range double bearing double EarthRadius 6371000 m double latA Math.toRadians point.x double lonA Math.toRadians point.y double angularDistance range EarthRadius double trueCourse Math.toRadians bearing double lat Math.asin Math.sin.. Math.toRadians point.x double lonA Math.toRadians point.y double angularDistance range EarthRadius double trueCourse Math.toRadians bearing double lat Math.asin Math.sin latA Math.cos angularDistance Math.cos latA Math.sin angularDistance Math.cos trueCourse..
Draw A Circle On Android MapView http://stackoverflow.com/questions/5293709/draw-a-circle-on-android-mapview mLon 1e6 projection.toPixels geo pt float circleRadius projection.metersToEquatorPixels mRadius 1 FloatMath.cos float Math.toRadians mLat Paint innerCirclePaint innerCirclePaint new Paint innerCirclePaint.setColor Color.BLUE innerCirclePaint.setAlpha 25.. mLon 1e6 projection.toPixels geo pt float circleRadius projection.metersToEquatorPixels mRadius 1 FloatMath.cos float Math.toRadians mLat Paint innerCirclePaint innerCirclePaint new Paint innerCirclePaint.setColor Color.BLUE innerCirclePaint.setAlpha 25.. fact that meridians come together at the poles. This can be corrected however by multiplying by 1 FloatMath.cos float Math.toRadians mLat which is the only change that I made to Scott's original answer. I hope this helps someone because I discovered the..
Android Gauge Animation Question http://stackoverflow.com/questions/6156674/android-gauge-animation-question p.setLastPoint width 2 width 2 add line from the center to arc at specified angle p.lineTo width 2 float Math.cos Math.toRadians angleStart width 2 width 2 float Math.sin Math.toRadians angleStart width 2 add arc from start angle with specified sweep.. to arc at specified angle p.lineTo width 2 float Math.cos Math.toRadians angleStart width 2 width 2 float Math.sin Math.toRadians angleStart width 2 add arc from start angle with specified sweep p.addArc new RectF 0 0 width width angleStart sweep from..
How do I draw an arrowhead (in Android)? http://stackoverflow.com/questions/6713757/how-do-i-draw-an-arrowhead-in-android This is where I'm confused private int findArrowPos double length double angle int points new int 2 double theta Math.toRadians angle result 0 centerX int length Math.cos theta result 1 centerY int length Math.sin theta return points I have taken..
How to calculate distance between two locations using their longitude and latitude value http://stackoverflow.com/questions/6981916/how-to-calculate-distance-between-two-locations-using-their-longitude-and-latitu String provider int status Bundle extras Calculating distance double earthRadius 3958.75 double dLat Math.toRadians lat1 lat2 double dLng Math.toRadians lng1 lng2 double a Math.sin dLat 2 Math.sin dLat 2 Math.cos Math.toRadians lat2.. Bundle extras Calculating distance double earthRadius 3958.75 double dLat Math.toRadians lat1 lat2 double dLng Math.toRadians lng1 lng2 double a Math.sin dLat 2 Math.sin dLat 2 Math.cos Math.toRadians lat2 Math.cos Math.toRadians lat1 Math.sin.. Math.toRadians lat1 lat2 double dLng Math.toRadians lng1 lng2 double a Math.sin dLat 2 Math.sin dLat 2 Math.cos Math.toRadians lat2 Math.cos Math.toRadians lat1 Math.sin dLng 2 Math.sin dLng 2 double c 2 Math.atan2 Math.sqrt a Math.sqrt 1 a double..
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