org.opentripplanner.model.plan.RelativeDirection Maven / Gradle / Ivy
package org.opentripplanner.model.plan;
/**
* Represents a turn direction, relative to the current heading.
*
* CIRCLE_CLOCKWISE and CIRCLE_CLOCKWISE are used to represent traffic circles.
*/
public enum RelativeDirection {
DEPART,
HARD_LEFT,
LEFT,
SLIGHTLY_LEFT,
CONTINUE,
SLIGHTLY_RIGHT,
RIGHT,
HARD_RIGHT,
CIRCLE_CLOCKWISE,
CIRCLE_COUNTERCLOCKWISE,
ELEVATOR,
UTURN_LEFT,
UTURN_RIGHT;
public static RelativeDirection calculate(
double lastAngle,
double thisAngle,
boolean roundabout
) {
return calculate(thisAngle - lastAngle, roundabout);
}
public static RelativeDirection calculate(double angle, boolean roundabout) {
double cwAngle = angle;
if (cwAngle < 0) {
cwAngle += Math.PI * 2;
}
double ccwAngle = Math.PI * 2 - cwAngle;
if (roundabout) {
// roundabout: the direction we turn onto it implies the circling direction
if (cwAngle > ccwAngle) {
return RelativeDirection.CIRCLE_CLOCKWISE;
} else {
return RelativeDirection.CIRCLE_COUNTERCLOCKWISE;
}
}
// less than 0.3 rad counts as straight, to simplify walking instructions
if (cwAngle < 0.3 || ccwAngle < 0.3) {
return RelativeDirection.CONTINUE;
} else if (cwAngle < 0.7) {
return RelativeDirection.SLIGHTLY_RIGHT;
} else if (ccwAngle < 0.7) {
return RelativeDirection.SLIGHTLY_LEFT;
} else if (cwAngle < 2) {
return RelativeDirection.RIGHT;
} else if (ccwAngle < 2) {
return RelativeDirection.LEFT;
} else if (cwAngle < Math.PI) {
return RelativeDirection.HARD_RIGHT;
} else {
return RelativeDirection.HARD_LEFT;
}
}
}