List of usage examples for java.lang Math PI
double PI
To view the source code for java.lang Math PI.
Click Source Link
From source file:Main.java
public static void setPerspectiveM(float[] m, int offset, double fovy, double aspect, double zNear, double zFar) { Matrix.setIdentityM(m, offset);// w w w . j a v a 2s . com double ymax = zNear * Math.tan(fovy * Math.PI / 360.0); double ymin = -ymax; double xmin = ymin * aspect; double xmax = ymax * aspect; Matrix.frustumM(m, offset, (float) xmin, (float) xmax, (float) ymin, (float) ymax, (float) zNear, (float) zFar); }
From source file:Main.java
/** * @param angle// w ww . j a v a 2 s . c om * @return the angle between -pi and pi */ public static double nomalizeAngleRadsPi(double angle) { double ret = angle; while (ret > Math.PI) ret -= TWO_PI_RADS; while (ret < -Math.PI) ret += TWO_PI_RADS; return ret; }
From source file:Main.java
/** * convert degrees to radians based on ios code from: http://blog.nova-box.com/2010/05/iphone-ray-picking-glunproject-sample.html * @param deg// w ww. j a va2 s . c o m * @return */ public static double degToRadians(float deg) { return deg / 180.0 * Math.PI; }
From source file:Main.java
/** * <p>This function converts radians to decimal degrees.</p> * * @param rad - the radian to convert// w ww. j a v a2 s . c om * @return the radian converted to decimal degrees */ private static final double rad2deg(double rad) { return (rad * 180 / Math.PI); }
From source file:Main.java
private static float getX(double angle, double radius) { return (float) (Math.cos(angle + Math.PI / 2) * radius); }
From source file:Main.java
public static void MercatorToBD(double mercatorX, double mercatorY) { CbdX = mercatorY / 20037508.34 * 180; CbdX = 180 / Math.PI * (2 * Math.atan(Math.exp(CbdX * Math.PI / 180)) - Math.PI / 2); CbdY = mercatorX / 20037508.34 * 180; Log.d("CustomerActivity", "x" + Double.toString(CbdX)); Log.d("CustomerActivity", "y" + Double.toString(CbdY)); }
From source file:Main.java
public static float getActionSpot(int _direction, int _distance, float _x, float _y, char _type, float _xOffset, float _yOffset) { // Palautetaan x- tai y-arvo _typen mukaan if (_type == 'x') { return _x + _xOffset + (float) Math.cos((_direction * Math.PI) / 180) * _distance; } else {//from ww w. j av a 2s . com return _y + _yOffset + (float) Math.sin((_direction * Math.PI) / 180) * _distance; } }
From source file:Main.java
public static double[] Rec2Sph(double x, double y, double z) { double[] sph = new double[3]; sph[0] = Math.sqrt(x * x + y * y + z * z); sph[1] = x == 0 ? 0 : Math.atan(Math.abs(y / x)); if (x < 0) sph[1] = Math.PI - sph[1]; if (y < 0) sph[1] *= -1;/*from w w w .ja v a 2 s . com*/ sph[2] = Math.asin(z / sph[0]); return sph; }
From source file:Main.java
public static double calculateDistance(double lat1, double lng1, double lat2, double lng2) { int MAXITERS = 20; // Convert lat/long to radians lat1 *= Math.PI / 180.0; lat2 *= Math.PI / 180.0;/*from w w w. j ava2 s .c om*/ lng1 *= Math.PI / 180.0; lng2 *= Math.PI / 180.0; double a = 6378137.0; // WGS84 major axis double b = 6356752.3142; // WGS84 semi-major axis double f = (a - b) / a; double aSqMinusBSqOverBSq = (a * a - b * b) / (b * b); double L = lng2 - lng1; double A = 0.0; double U1 = Math.atan((1.0 - f) * Math.tan(lat1)); double U2 = Math.atan((1.0 - f) * Math.tan(lat2)); double cosU1 = Math.cos(U1); double cosU2 = Math.cos(U2); double sinU1 = Math.sin(U1); double sinU2 = Math.sin(U2); double cosU1cosU2 = cosU1 * cosU2; double sinU1sinU2 = sinU1 * sinU2; double sigma = 0.0; double deltaSigma = 0.0; double cosSqAlpha = 0.0; double cos2SM = 0.0; double cosSigma = 0.0; double sinSigma = 0.0; double cosLambda = 0.0; double sinLambda = 0.0; double lambda = L; // initial guess for (int iter = 0; iter < MAXITERS; iter++) { double lambdaOrig = lambda; cosLambda = Math.cos(lambda); sinLambda = Math.sin(lambda); double t1 = cosU2 * sinLambda; double t2 = cosU1 * sinU2 - sinU1 * cosU2 * cosLambda; double sinSqSigma = t1 * t1 + t2 * t2; // (14) sinSigma = Math.sqrt(sinSqSigma); cosSigma = sinU1sinU2 + cosU1cosU2 * cosLambda; // (15) sigma = Math.atan2(sinSigma, cosSigma); // (16) double sinAlpha = (sinSigma == 0) ? 0.0 : cosU1cosU2 * sinLambda / sinSigma; // (17) cosSqAlpha = 1.0 - sinAlpha * sinAlpha; cos2SM = (cosSqAlpha == 0) ? 0.0 : cosSigma - 2.0 * sinU1sinU2 / cosSqAlpha; // (18) double uSquared = cosSqAlpha * aSqMinusBSqOverBSq; // defn A = 1 + (uSquared / 16384.0) * // (3) (4096.0 + uSquared * (-768 + uSquared * (320.0 - 175.0 * uSquared))); double B = (uSquared / 1024.0) * // (4) (256.0 + uSquared * (-128.0 + uSquared * (74.0 - 47.0 * uSquared))); double C = (f / 16.0) * cosSqAlpha * (4.0 + f * (4.0 - 3.0 * cosSqAlpha)); // (10) double cos2SMSq = cos2SM * cos2SM; deltaSigma = B * sinSigma * // (6) (cos2SM + (B / 4.0) * (cosSigma * (-1.0 + 2.0 * cos2SMSq) - (B / 6.0) * cos2SM * (-3.0 + 4.0 * sinSigma * sinSigma) * (-3.0 + 4.0 * cos2SMSq))); lambda = L + (1.0 - C) * f * sinAlpha * (sigma + C * sinSigma * (cos2SM + C * cosSigma * (-1.0 + 2.0 * cos2SM * cos2SM))); // (11) double delta = (lambda - lambdaOrig) / lambda; if (Math.abs(delta) < 1.0e-12) { break; } } float distance = (float) (b * A * (sigma - deltaSigma)); return distance; }
From source file:Main.java
public static double gps2km(final double lat_a, final double lng_a, final double lat_b, final double lng_b) { if (!isGpsValid(lng_a, lat_a) || !isGpsValid(lng_b, lat_b)) { return -1; }/*from w w w . j a v a 2 s . c o m*/ final double radLat1 = (lat_a * Math.PI / 180.0); final double radLat2 = (lat_b * Math.PI / 180.0); final double a = radLat1 - radLat2; final double b = (lng_a - lng_b) * Math.PI / 180.0; final double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2))); return s * EARTH_RADIUS; }