phaser/Phaser/utils/CircleUtils.js

/// <reference path="../_definitions.ts" />
/**
* Phaser - CircleUtils
*
* A collection of methods useful for manipulating and comparing Circle objects.
*/
var Phaser;
(function (Phaser) {
    var CircleUtils = (function () {
        function CircleUtils() {
        }
        CircleUtils.clone = /**
        * Returns a new Circle object with the same values for the x, y, width, and height properties as the original Circle object.
        * @method clone
        * @param {Circle} a - The Circle object.
        * @param {Circle} [optional] out Optional Circle object. If given the values will be set into the object, otherwise a brand new Circle object will be created and returned.
        * @return {Phaser.Circle}
        **/
        function (a, out) {
            if (typeof out === "undefined") { out = new Phaser.Circle(); }
            return out.setTo(a.x, a.y, a.diameter);
        };

        CircleUtils.contains = /**
        * Return true if the given x/y coordinates are within the Circle object.
        * If you need details about the intersection then use Phaser.Intersect.circleContainsPoint instead.
        * @method contains
        * @param {Circle} a - The Circle object.
        * @param {Number} The X value of the coordinate to test.
        * @param {Number} The Y value of the coordinate to test.
        * @return {Boolean} True if the coordinates are within this circle, otherwise false.
        **/
        function (a, x, y) {
            if (x >= a.left && x <= a.right && y >= a.top && y <= a.bottom) {
                var dx = (a.x - x) * (a.x - x);
                var dy = (a.y - y) * (a.y - y);
                return (dx + dy) <= (a.radius * a.radius);
            }

            return false;
        };

        CircleUtils.containsPoint = /**
        * Return true if the coordinates of the given Point object are within this Circle object.
        * If you need details about the intersection then use Phaser.Intersect.circleContainsPoint instead.
        * @method containsPoint
        * @param {Circle} a - The Circle object.
        * @param {Point} The Point object to test.
        * @return {Boolean} True if the coordinates are within this circle, otherwise false.
        **/
        function (a, point) {
            return CircleUtils.contains(a, point.x, point.y);
        };

        CircleUtils.containsCircle = /**
        * Return true if the given Circle is contained entirely within this Circle object.
        * If you need details about the intersection then use Phaser.Intersect.circleToCircle instead.
        * @method containsCircle
        * @param {Circle} The Circle object to test.
        * @return {Boolean} True if the coordinates are within this circle, otherwise false.
        **/
        function (a, b) {
            //return ((a.radius + b.radius) * (a.radius + b.radius)) >= Collision.distanceSquared(a.x, a.y, b.x, b.y);
            return true;
        };

        CircleUtils.distanceBetween = /**
        * Returns the distance from the center of the Circle object to the given object (can be Circle, Point or anything with x/y properties)
        * @method distanceBetween
        * @param {Circle} a - The Circle object.
        * @param {Circle} b - The target object. Must have visible x and y properties that represent the center of the object.
        * @param {Boolean} [optional] round - Round the distance to the nearest integer (default false)
        * @return {Number} The distance between this Point object and the destination Point object.
        **/
        function (a, target, round) {
            if (typeof round === "undefined") { round = false; }
            var dx = a.x - target.x;
            var dy = a.y - target.y;

            if (round === true) {
                return Math.round(Math.sqrt(dx * dx + dy * dy));
            } else {
                return Math.sqrt(dx * dx + dy * dy);
            }
        };

        CircleUtils.equals = /**
        * Determines whether the two Circle objects match. This method compares the x, y and diameter properties.
        * @method equals
        * @param {Circle} a - The first Circle object.
        * @param {Circle} b - The second Circle object.
        * @return {Boolean} A value of true if the object has exactly the same values for the x, y and diameter properties as this Circle object; otherwise false.
        **/
        function (a, b) {
            return (a.x == b.x && a.y == b.y && a.diameter == b.diameter);
        };

        CircleUtils.intersects = /**
        * Determines whether the two Circle objects intersect.
        * This method checks the radius distances between the two Circle objects to see if they intersect.
        * @method intersects
        * @param {Circle} a - The first Circle object.
        * @param {Circle} b - The second Circle object.
        * @return {Boolean} A value of true if the specified object intersects with this Circle object; otherwise false.
        **/
        function (a, b) {
            return (Phaser.CircleUtils.distanceBetween(a, b) <= (a.radius + b.radius));
        };

        CircleUtils.circumferencePoint = /**
        * Returns a Point object containing the coordinates of a point on the circumference of the Circle based on the given angle.
        * @method circumferencePoint
        * @param {Circle} a - The first Circle object.
        * @param {Number} angle The angle in radians (unless asDegrees is true) to return the point from.
        * @param {Boolean} asDegrees Is the given angle in radians (false) or degrees (true)?
        * @param {Phaser.Point} [optional] output An optional Point object to put the result in to. If none specified a new Point object will be created.
        * @return {Phaser.Point} The Point object holding the result.
        **/
        function (a, angle, asDegrees, out) {
            if (typeof asDegrees === "undefined") { asDegrees = false; }
            if (typeof out === "undefined") { out = new Phaser.Point(); }
            if (asDegrees === true) {
                angle = angle * Phaser.GameMath.DEG_TO_RAD;
            }

            return out.setTo(a.x + a.radius * Math.cos(angle), a.y + a.radius * Math.sin(angle));
        };

        CircleUtils.intersectsRectangle = /*
        public static boolean intersect(Rectangle r, Circle c)
        {
        float cx = Math.abs(c.x - r.x - r.halfWidth);
        float xDist = r.halfWidth + c.radius;
        if (cx > xDist)
        return false;
        float cy = Math.abs(c.y - r.y - r.halfHeight);
        float yDist = r.halfHeight + c.radius;
        if (cy > yDist)
        return false;
        if (cx <= r.halfWidth || cy <= r.halfHeight)
        return true;
        float xCornerDist = cx - r.halfWidth;
        float yCornerDist = cy - r.halfHeight;
        float xCornerDistSq = xCornerDist * xCornerDist;
        float yCornerDistSq = yCornerDist * yCornerDist;
        float maxCornerDistSq = c.radius * c.radius;
        return xCornerDistSq + yCornerDistSq <= maxCornerDistSq;
        }
        */
        function (c, r) {
            var cx = Math.abs(c.x - r.x - r.halfWidth);
            var xDist = r.halfWidth + c.radius;

            if (cx > xDist) {
                return false;
            }

            var cy = Math.abs(c.y - r.y - r.halfHeight);
            var yDist = r.halfHeight + c.radius;

            if (cy > yDist) {
                return false;
            }

            if (cx <= r.halfWidth || cy <= r.halfHeight) {
                return true;
            }

            var xCornerDist = cx - r.halfWidth;
            var yCornerDist = cy - r.halfHeight;
            var xCornerDistSq = xCornerDist * xCornerDist;
            var yCornerDistSq = yCornerDist * yCornerDist;
            var maxCornerDistSq = c.radius * c.radius;

            return xCornerDistSq + yCornerDistSq <= maxCornerDistSq;
        };
        return CircleUtils;
    })();
    Phaser.CircleUtils = CircleUtils;
})(Phaser || (Phaser = {}));