Java Utililty Methods Angle from Point

double getAngle(double originX, double originY, double x, double y)
The getAngle method returns the angle between (x, y) and (originX, originY).

double adj = x - originX;
double opp = y - originY;
double rad = 0.0;
if (adj == 0) {
 if (opp == 0) {
 return 0.0;
 } else {
 rad = Math.PI / 2;
...

double getAngle(Point2D center, Point2D point)
get Angle

return Math.atan2(-(point.getY() - center.getY()), point.getX() - center.getX());

double getAngle(Point2D origin, Point2D target)
get Angle

double angle = Math.toDegrees(Math.atan2((origin.getY() - target.getY()), (target.getX() - origin.getX())));
if (angle < 0) {
 angle += 360;
return angle;

double getAngle(Point2D p1, Point2D p2)
get Angle

if (p1.equals(p2)) {
 throw new IllegalArgumentException();
double a = -Math.atan2(p2.getY() - p1.getY(), p2.getX() - p1.getX());
a = a * 180.0 / Math.PI;
a -= 90;
if (a >= 360.0) {
 a -= 360.0;
...

double getAngle(Point2D startPosition, Point2D endPosition)
get Angle

double deltaX = endPosition.getX() - startPosition.getX();
double deltaY = endPosition.getY() - startPosition.getY();
return Math.atan2(deltaY, deltaX);

double getAngle(Point2D.Double vertPt, Point2D.Double edgePt)
get Angle

double dx = Math.abs(edgePt.x - vertPt.x), dy = Math.abs(edgePt.y - vertPt.y);
if (dx == 0.0D) {
 if (edgePt.y > vertPt.y)
 return Math.PI / 2.0D;
 else
 return 3 * Math.PI / 2.0D;
} else if (dy == 0.0D) {
 if (edgePt.x > vertPt.x)
...

double getAngleForPoint(Arc2D arc, int x, int y)
get Angle For Point

double px = x - arc.getCenterX();
double py = arc.getCenterY() - y;
double d = Math.sqrt(px * px + py * py);
double a1 = Math.toDegrees(Math.acos(px / d));
double a2 = Math.toDegrees(Math.asin(py / d));
if (a2 < 0) {
 if (a1 > 90)
 return 360 - a1;
...