mirror of
https://github.com/photonstorm/phaser
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498 lines
16 KiB
JavaScript
498 lines
16 KiB
JavaScript
/**
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* Phaser - Circle
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*
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* Creates a new Circle object with the center coordinate specified by the x and y parameters and the diameter specified by the diameter parameter. If you call this function without parameters, a circle with x, y, diameter and radius properties set to 0 is created.
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* @class Circle
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* @constructor
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* @param {Number} [x] The x coordinate of the center of the circle.
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* @param {Number} [y] The y coordinate of the center of the circle.
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* @param {Number} [diameter] The diameter of the circle.
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* @return {Circle} This circle object
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**/
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Phaser.Circle = function (x, y, diameter) {
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x = x || 0;
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y = y || 0;
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diameter = diameter || 0;
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/**
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* The x coordinate of the center of the circle
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* @property x
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* @type Number
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**/
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this.x = x;
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/**
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* The y coordinate of the center of the circle
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* @property y
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* @type Number
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**/
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this.y = y;
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this._diameter = diameter;
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if (diameter > 0)
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{
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this._radius = diameter * 0.5;
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}
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else
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{
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this._radius = 0;
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}
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};
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Phaser.Circle.prototype = {
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/**
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* The circumference of the circle.
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* @method circumference
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* @return {Number}
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**/
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circumference: function () {
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return 2 * (Math.PI * this._radius);
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},
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/**
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* Sets the members of Circle to the specified values.
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* @method setTo
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* @param {Number} x The x coordinate of the center of the circle.
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* @param {Number} y The y coordinate of the center of the circle.
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* @param {Number} diameter The diameter of the circle in pixels.
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* @return {Circle} This circle object
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**/
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setTo: function (x, y, diameter) {
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this.x = x;
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this.y = y;
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this._diameter = diameter;
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this._radius = diameter * 0.5;
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return this;
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},
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/**
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* Copies the x, y and diameter properties from any given object to this Circle.
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* @method copyFrom
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* @param {any} source - The object to copy from.
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* @return {Circle} This Circle object.
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**/
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copyFrom: function (source) {
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return this.setTo(source.x, source.y, source.diameter);
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},
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/**
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* Copies the x, y and diameter properties from this Circle to any given object.
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* @method copyTo
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* @param {any} dest - The object to copy to.
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* @return {Object} This dest object.
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**/
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copyTo: function(dest) {
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dest[x] = this.x;
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dest[y] = this.y;
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dest[diameter] = this._diameter;
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return dest;
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},
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/**
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* Returns the distance from the center of the Circle object to the given object
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* (can be Circle, Point or anything with x/y properties)
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* @method distance
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* @param {object} dest The target object. Must have visible x and y properties that represent the center of the object.
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* @param {bool} [optional] round Round the distance to the nearest integer (default false)
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* @return {Number} The distance between this Point object and the destination Point object.
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*/
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distance: function (dest, round) {
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if (typeof round === "undefined") { round = false }
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if (round)
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{
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return Phaser.Math.distanceRound(this.x, this.y, dest.x, dest.y);
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}
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else
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{
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return Phaser.Math.distance(this.x, this.y, dest.x, dest.y);
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}
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},
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/**
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* Returns a new Circle object with the same values for the x, y, width, and height properties as this Circle object.
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* @method clone
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* @param {Phaser.Circle} 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.
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* @return {Phaser.Circle} The cloned Circle object.
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*/
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clone: function(out) {
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if (typeof out === "undefined") { out = new Phaser.Circle(); }
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return out.setTo(a.x, a.y, a.diameter);
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},
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/**
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* Return true if the given x/y coordinates are within this Circle object.
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* @method contains
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* @param {Number} x The X value of the coordinate to test.
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* @param {Number} y The Y value of the coordinate to test.
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* @return {bool} True if the coordinates are within this circle, otherwise false.
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*/
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contains: function (x, y) {
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return Phaser.Circle.contains(this, x, y);
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},
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/**
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* Returns a Point object containing the coordinates of a point on the circumference of the Circle based on the given angle.
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* @method circumferencePoint
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* @param {Number} angle The angle in radians (unless asDegrees is true) to return the point from.
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* @param {bool} asDegrees Is the given angle in radians (false) or degrees (true)?
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* @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.
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* @return {Phaser.Point} The Point object holding the result.
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*/
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circumferencePoint: function (angle, asDegrees, out) {
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return Phaser.Circle.circumferencePoint(this, angle, asDegrees, out);
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},
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/**
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* Adjusts the location of the Circle object, as determined by its center coordinate, by the specified amounts.
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* @method offset
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* @param {Number} dx Moves the x value of the Circle object by this amount.
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* @param {Number} dy Moves the y value of the Circle object by this amount.
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* @return {Circle} This Circle object.
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**/
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offset: function (dx, dy) {
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this.x += dx;
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this.y += dy;
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return this;
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},
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/**
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* Adjusts the location of the Circle object using a Point object as a parameter. This method is similar to the Circle.offset() method, except that it takes a Point object as a parameter.
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* @method offsetPoint
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* @param {Point} point A Point object to use to offset this Circle object (or any valid object with exposed x and y properties).
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* @return {Circle} This Circle object.
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**/
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offsetPoint: function (point) {
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return this.offset(point.x, point.y);
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},
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/**
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* Returns a string representation of this object.
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* @method toString
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* @return {string} a string representation of the instance.
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**/
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toString: function () {
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return "[{Phaser.Circle (x=" + this.x + " y=" + this.y + " diameter=" + this.diameter + " radius=" + this.radius + ")}]";
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}
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};
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// Getters / Setters
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Object.defineProperty(Phaser.Circle.prototype, "diameter", {
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/**
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* The diameter of the circle. The largest distance between any two points on the circle. The same as the radius * 2.
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* @method diameter
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* @return {Number}
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**/
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get: function () {
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return this._diameter;
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},
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/**
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* The diameter of the circle. The largest distance between any two points on the circle. The same as the radius * 2.
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* @method diameter
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* @param {Number} The diameter of the circle.
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**/
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set: function (value) {
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if (value > 0) {
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this._diameter = value;
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this._radius = value * 0.5;
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}
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}
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});
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Object.defineProperty(Phaser.Circle.prototype, "radius", {
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/**
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* The radius of the circle. The length of a line extending from the center of the circle to any point on the circle itself. The same as half the diameter.
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* @method radius
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* @return {Number}
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**/
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get: function () {
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return this._radius;
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},
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/**
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* The radius of the circle. The length of a line extending from the center of the circle to any point on the circle itself. The same as half the diameter.
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* @method radius
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* @param {Number} The radius of the circle.
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**/
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set: function (value) {
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if (value > 0) {
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this._radius = value;
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this._diameter = value * 2;
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}
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}
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});
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Object.defineProperty(Phaser.Circle.prototype, "left", {
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/**
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* The x coordinate of the leftmost point of the circle. Changing the left property of a Circle object has no effect on the x and y properties. However it does affect the diameter, whereas changing the x value does not affect the diameter property.
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* @method left
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* @return {Number} The x coordinate of the leftmost point of the circle.
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**/
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get: function () {
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return this.x - this._radius;
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},
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/**
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* The x coordinate of the leftmost point of the circle. Changing the left property of a Circle object has no effect on the x and y properties. However it does affect the diameter, whereas changing the x value does not affect the diameter property.
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* @method left
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* @param {Number} The value to adjust the position of the leftmost point of the circle by.
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**/
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set: function (value) {
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if (value > this.x) {
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this._radius = 0;
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this._diameter = 0;
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} else {
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this.radius = this.x - value;
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}
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}
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});
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Object.defineProperty(Phaser.Circle.prototype, "right", {
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/**
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* The x coordinate of the rightmost point of the circle. Changing the right property of a Circle object has no effect on the x and y properties. However it does affect the diameter, whereas changing the x value does not affect the diameter property.
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* @method right
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* @return {Number}
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**/
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get: function () {
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return this.x + this._radius;
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},
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/**
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* The x coordinate of the rightmost point of the circle. Changing the right property of a Circle object has no effect on the x and y properties. However it does affect the diameter, whereas changing the x value does not affect the diameter property.
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* @method right
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* @param {Number} The amount to adjust the diameter of the circle by.
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**/
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set: function (value) {
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if (value < this.x) {
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this._radius = 0;
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this._diameter = 0;
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} else {
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this.radius = value - this.x;
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}
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}
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});
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Object.defineProperty(Phaser.Circle.prototype, "top", {
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/**
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* The sum of the y minus the radius property. Changing the top property of a Circle object has no effect on the x and y properties, but does change the diameter.
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* @method bottom
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* @return {Number}
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**/
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get: function () {
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return this.y - this._radius;
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},
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/**
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* The sum of the y minus the radius property. Changing the top property of a Circle object has no effect on the x and y properties, but does change the diameter.
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* @method bottom
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* @param {Number} The amount to adjust the height of the circle by.
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**/
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set: function (value) {
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if (value > this.y) {
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this._radius = 0;
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this._diameter = 0;
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} else {
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this.radius = this.y - value;
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}
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}
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});
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Object.defineProperty(Phaser.Circle.prototype, "bottom", {
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/**
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* The sum of the y and radius properties. Changing the bottom property of a Circle object has no effect on the x and y properties, but does change the diameter.
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* @method bottom
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* @return {Number}
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**/
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get: function () {
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return this.y + this._radius;
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},
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/**
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* The sum of the y and radius properties. Changing the bottom property of a Circle object has no effect on the x and y properties, but does change the diameter.
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* @method bottom
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* @param {Number} The value to adjust the height of the circle by.
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**/
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set: function (value) {
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if (value < this.y) {
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this._radius = 0;
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this._diameter = 0;
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} else {
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this.radius = value - this.y;
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}
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}
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});
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Object.defineProperty(Phaser.Circle.prototype, "area", {
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/**
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* Gets the area of this Circle.
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* @method area
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* @return {Number} This area of this circle.
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**/
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get: function () {
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if (this._radius > 0) {
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return Math.PI * this._radius * this._radius;
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} else {
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return 0;
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}
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}
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});
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Object.defineProperty(Phaser.Circle.prototype, "empty", {
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/**
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* Determines whether or not this Circle object is empty.
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* @method empty
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* @return {bool} A value of true if the Circle objects diameter is less than or equal to 0; otherwise false.
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**/
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get: function () {
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return (this._diameter == 0);
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},
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/**
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* Sets all of the Circle objects properties to 0. A Circle object is empty if its diameter is less than or equal to 0.
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* @method setEmpty
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* @return {Circle} This Circle object
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**/
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set: function (value) {
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this.setTo(0, 0, 0);
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}
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});
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// Statics
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/**
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* Return true if the given x/y coordinates are within the Circle object.
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* @method contains
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* @param {Phaser.Circle} a The Circle to be checked.
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* @param {Number} x The X value of the coordinate to test.
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* @param {Number} y The Y value of the coordinate to test.
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* @return {bool} True if the coordinates are within this circle, otherwise false.
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*/
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Phaser.Circle.contains = function (a, x, y) {
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// Check if x/y are within the bounds first
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if (x >= a.left && x <= a.right && y >= a.top && y <= a.bottom) {
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var dx = (a.x - x) * (a.x - x);
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var dy = (a.y - y) * (a.y - y);
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return (dx + dy) <= (a.radius * a.radius);
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}
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return false;
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};
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/**
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* Determines whether the two Circle objects match. This method compares the x, y and diameter properties.
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* @method equals
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* @param {Phaser.Circle} a The first Circle object.
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* @param {Phaser.Circle} b The second Circle object.
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* @return {bool} 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.
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*/
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Phaser.Circle.equals = function (a, b) {
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return (a.x == b.x && a.y == b.y && a.diameter == b.diameter);
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};
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/**
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* Determines whether the two Circle objects intersect.
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* This method checks the radius distances between the two Circle objects to see if they intersect.
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* @method intersects
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* @param {Phaser.Circle} a The first Circle object.
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* @param {Phaser.Circle} b The second Circle object.
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* @return {bool} A value of true if the specified object intersects with this Circle object; otherwise false.
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*/
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Phaser.Circle.intersects = function (a, b) {
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return (Phaser.Math.distance(a.x, a.y, b.x, b.y) <= (a.radius + b.radius));
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};
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/**
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* Returns a Point object containing the coordinates of a point on the circumference of the Circle based on the given angle.
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* @method circumferencePoint
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* @param {Phaser.Circle} a The first Circle object.
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* @param {Number} angle The angle in radians (unless asDegrees is true) to return the point from.
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* @param {bool} asDegrees Is the given angle in radians (false) or degrees (true)?
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* @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.
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* @return {Phaser.Point} The Point object holding the result.
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*/
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Phaser.Circle.circumferencePoint = function (a, angle, asDegrees, out) {
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if (typeof asDegrees === "undefined") { asDegrees = false; }
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if (typeof out === "undefined") { out = new Phaser.Point(); }
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if (asDegrees === true) {
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angle = Phaser.Math.radToDeg(angle);
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}
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out.x = a.x + a.radius * Math.cos(angle);
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out.y = a.y + a.radius * Math.sin(angle);
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return out;
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};
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/**
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* Checks if the given Circle and Rectangle objects intersect.
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* @method intersectsRectangle
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* @param {Phaser.Circle} c The Circle object to test.
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* @param {Phaser.Rectangle} r The Rectangle object to test.
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* @return {bool} True if the two objects intersect, otherwise false.
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*/
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Phaser.Circle.intersectsRectangle = function (c, r) {
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var cx = Math.abs(c.x - r.x - r.halfWidth);
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var xDist = r.halfWidth + c.radius;
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if (cx > xDist) {
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return false;
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}
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var cy = Math.abs(c.y - r.y - r.halfHeight);
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var yDist = r.halfHeight + c.radius;
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if (cy > yDist) {
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return false;
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}
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if (cx <= r.halfWidth || cy <= r.halfHeight) {
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return true;
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}
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var xCornerDist = cx - r.halfWidth;
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var yCornerDist = cy - r.halfHeight;
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var xCornerDistSq = xCornerDist * xCornerDist;
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var yCornerDistSq = yCornerDist * yCornerDist;
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var maxCornerDistSq = c.radius * c.radius;
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return xCornerDistSq + yCornerDistSq <= maxCornerDistSq;
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};
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