public double bearingTo(Placeable p) {
int xdist, ydist;
double angle;
double bearing;
if (p == null) {
return 0;
}
xdist = p.getX() - xcoord;
ydist = p.getY() - ycoord;
angle = Math.atan(((double) ydist) / xdist);
angle = angle * 180 / Math.PI;
if (angle < 0) {
if (xdist < 0) {
angle = 180 + angle; // 360 + angle - 180
} else {
angle = 360 + angle;
}
} else if (xdist < 0) {
angle = 180 + angle;
}
if (angle > heading) {
bearing = angle - heading;
} else if (angle == heading) {
bearing = 0;
} else {
bearing = angle + 360 - heading;
}
return bearing;
}
