EpgyUtil.java

package session2;


/**
 * A set of simpler functions for working with angles in robocode.
 * 
 * @author Matthew Chun-Lum
 *
 */
public abstract class EpgyUtil {

    /**
     * Computes the distance to the given location from another location
     * @param x1 the x coordinate of the first location
     * @param y1 the y coordinate of the first location
     * @param x2 the x coordinate of the second location
     * @param y2 the y coordinate of the second location
     * @return the distance between the passed coordinates
     */
    public static double distanceTo(double x1, double y1, double x2, double y2) {
        x1 -= x2;
        y1 -= y2;
        return Math.sqrt(x1 * x1 + y1 * y1);
    }
    
    // ---------- Trig Functions ---------- //
    
    /**
     * Computes the bearing from the source to the target locations
     * @param sourceX
     * @param sourceY
     * @param targetX
     * @param targetY
     * @return the absolute bearing in degrees
     */
    public static double bearingToLocation(double sourceX, double sourceY, double targetX, double targetY) {
        return Math.toDegrees(Math.atan2(targetX - sourceX, targetY - sourceY));
    }
    
    /**
     * Computes the sine of the passed angle (in degrees)
     * @param degrees the angle 
     * @return the sine of the passed angle
     */
    public static double sin(double degrees) {
        return Math.sin(Math.toRadians(degrees));
    }
    
    /**
     * Computes the arc sine (inverse sine) corresponding to the passed
     * value. 
     * @param value
     * @return the angle corresponding to the passed value in the range of -90 to 90 degrees
     */
    public static double asin(double value) {
        return Math.toDegrees(Math.asin(value));
    }
    
    /**
     * Computes the cosine of the passed angle (in degrees)
     * @param degrees the angle
     * @return the cosine of the passed angle
     */
    public static double cos(double degrees) {
        return Math.cos(Math.toRadians(degrees));
    }
    
    /**
     * Computes the arc cosine of the passed value
     * @param value
     * @return the angle corresponding to the passed value in the range of 0 to 180 degrees
     */
    public double acos(double value) {
        return Math.toDegrees(Math.acos(value));
    }
    
    /**
     * Computes the tangent of the passed angle (in degrees)
     * @param degrees
     * @return
     */
    public static double tan(double degrees) {
        return Math.tan(Math.toRadians(degrees));
    }
    
    /**
     * Computes the arc tangent of the passed value
     * @param value
     * @return the angle corresponding to the passed value in the range of -90 to 90 degrees
     */
    public static double atan(double value) {
        return Math.toDegrees(Math.atan(value));
    }
    
    /**
     * Computes the arc tangent of the passed x and y values
     * @param x
     * @param y
     * @return the angle corresponding to the passed values in the range of -180 to 180 degrees
     */
    public static double atan2(double x, double y) {
        return Math.toDegrees(Math.atan2(x, y));
    }
}