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1089 lines
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1089 lines
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<h1 class="page-title">Source: geom/Circle.js</h1>
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<section>
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<article>
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<pre class="sunlight-highlight-javascript linenums">/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2014 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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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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* @classdesc Phaser - Circle
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* @constructor
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* @param {number} [x=0] - The x coordinate of the center of the circle.
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* @param {number} [y=0] - The y coordinate of the center of the circle.
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* @param {number} [diameter=0] - The diameter of the circle.
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* @return {Phaser.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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* @property {number} x - The x coordinate of the center of the circle.
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*/
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this.x = x;
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/**
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* @property {number} y - The y coordinate of the center of the circle.
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*/
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this.y = y;
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/**
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* @property {number} _diameter - The diameter of the circle.
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* @private
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*/
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this._diameter = diameter;
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if (diameter > 0)
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{
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/**
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* @property {number} _radius - The radius of the circle.
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* @private
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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 Phaser.Circle#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 Phaser.Circle#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 Phaser.Circle#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 Phaser.Circle#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
|
|
* (can be Circle, Point or anything with x/y properties)
|
|
* @method Phaser.Circle#distance
|
|
* @param {object} dest - The target object. Must have visible x and y properties that represent the center of the object.
|
|
* @param {boolean} [round] - Round the distance to the nearest integer (default false).
|
|
* @return {number} The distance between this Point object and the destination Point object.
|
|
*/
|
|
distance: function (dest, round) {
|
|
|
|
if (typeof round === "undefined") { round = false }
|
|
|
|
if (round)
|
|
{
|
|
return Phaser.Math.distanceRound(this.x, this.y, dest.x, dest.y);
|
|
}
|
|
else
|
|
{
|
|
return Phaser.Math.distance(this.x, this.y, dest.x, dest.y);
|
|
}
|
|
|
|
},
|
|
|
|
/**
|
|
* Returns a new Circle object with the same values for the x, y, width, and height properties as this Circle object.
|
|
* @method Phaser.Circle#clone
|
|
* @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.
|
|
* @return {Phaser.Circle} The cloned Circle object.
|
|
*/
|
|
clone: function (out) {
|
|
|
|
if (typeof out === "undefined")
|
|
{
|
|
out = new Phaser.Circle(this.x, this.y, this.diameter);
|
|
}
|
|
else
|
|
{
|
|
out.setTo(this.x, this.y, this.diameter);
|
|
}
|
|
|
|
return out;
|
|
|
|
},
|
|
|
|
/**
|
|
* Return true if the given x/y coordinates are within this Circle object.
|
|
* @method Phaser.Circle#contains
|
|
* @param {number} x - The X value of the coordinate to test.
|
|
* @param {number} y - The Y value of the coordinate to test.
|
|
* @return {boolean} True if the coordinates are within this circle, otherwise false.
|
|
*/
|
|
contains: function (x, y) {
|
|
|
|
return Phaser.Circle.contains(this, x, y);
|
|
|
|
},
|
|
|
|
/**
|
|
* Returns a Point object containing the coordinates of a point on the circumference of the Circle based on the given angle.
|
|
* @method Phaser.Circle#circumferencePoint
|
|
* @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} [out] - 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.
|
|
*/
|
|
circumferencePoint: function (angle, asDegrees, out) {
|
|
|
|
return Phaser.Circle.circumferencePoint(this, angle, asDegrees, out);
|
|
|
|
},
|
|
|
|
/**
|
|
* Adjusts the location of the Circle object, as determined by its center coordinate, by the specified amounts.
|
|
* @method Phaser.Circle#offset
|
|
* @param {number} dx - Moves the x value of the Circle object by this amount.
|
|
* @param {number} dy - Moves the y value of the Circle object by this amount.
|
|
* @return {Circle} This Circle object.
|
|
*/
|
|
offset: function (dx, dy) {
|
|
|
|
this.x += dx;
|
|
this.y += dy;
|
|
|
|
return this;
|
|
|
|
},
|
|
|
|
/**
|
|
* 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.
|
|
* @method Phaser.Circle#offsetPoint
|
|
* @param {Point} point A Point object to use to offset this Circle object (or any valid object with exposed x and y properties).
|
|
* @return {Circle} This Circle object.
|
|
*/
|
|
offsetPoint: function (point) {
|
|
return this.offset(point.x, point.y);
|
|
},
|
|
|
|
/**
|
|
* Returns a string representation of this object.
|
|
* @method Phaser.Circle#toString
|
|
* @return {string} a string representation of the instance.
|
|
*/
|
|
toString: function () {
|
|
return "[{Phaser.Circle (x=" + this.x + " y=" + this.y + " diameter=" + this.diameter + " radius=" + this.radius + ")}]";
|
|
}
|
|
|
|
};
|
|
|
|
Phaser.Circle.prototype.constructor = Phaser.Circle;
|
|
|
|
/**
|
|
* The largest distance between any two points on the circle. The same as the radius * 2.
|
|
* @name Phaser.Circle#diameter
|
|
* @property {number} diameter - Gets or sets the diameter of the circle.
|
|
*/
|
|
Object.defineProperty(Phaser.Circle.prototype, "diameter", {
|
|
|
|
get: function () {
|
|
return this._diameter;
|
|
},
|
|
|
|
set: function (value) {
|
|
|
|
if (value > 0)
|
|
{
|
|
this._diameter = value;
|
|
this._radius = value * 0.5;
|
|
}
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* 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.
|
|
* @name Phaser.Circle#radius
|
|
* @property {number} radius - Gets or sets the radius of the circle.
|
|
*/
|
|
Object.defineProperty(Phaser.Circle.prototype, "radius", {
|
|
|
|
get: function () {
|
|
return this._radius;
|
|
},
|
|
|
|
set: function (value) {
|
|
|
|
if (value > 0)
|
|
{
|
|
this._radius = value;
|
|
this._diameter = value * 2;
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* 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.
|
|
* @name Phaser.Circle#left
|
|
* @propety {number} left - Gets or sets the value of the leftmost point of the circle.
|
|
*/
|
|
Object.defineProperty(Phaser.Circle.prototype, "left", {
|
|
|
|
get: function () {
|
|
return this.x - this._radius;
|
|
},
|
|
|
|
set: function (value) {
|
|
|
|
if (value > this.x)
|
|
{
|
|
this._radius = 0;
|
|
this._diameter = 0;
|
|
}
|
|
else
|
|
{
|
|
this.radius = this.x - value;
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* 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.
|
|
* @name Phaser.Circle#right
|
|
* @property {number} right - Gets or sets the value of the rightmost point of the circle.
|
|
*/
|
|
Object.defineProperty(Phaser.Circle.prototype, "right", {
|
|
|
|
get: function () {
|
|
return this.x + this._radius;
|
|
},
|
|
|
|
set: function (value) {
|
|
|
|
if (value < this.x)
|
|
{
|
|
this._radius = 0;
|
|
this._diameter = 0;
|
|
}
|
|
else
|
|
{
|
|
this.radius = value - this.x;
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* 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.
|
|
* @name Phaser.Circle#top
|
|
* @property {number} top - Gets or sets the top of the circle.
|
|
*/
|
|
Object.defineProperty(Phaser.Circle.prototype, "top", {
|
|
|
|
get: function () {
|
|
return this.y - this._radius;
|
|
},
|
|
|
|
set: function (value) {
|
|
|
|
if (value > this.y)
|
|
{
|
|
this._radius = 0;
|
|
this._diameter = 0;
|
|
}
|
|
else
|
|
{
|
|
this.radius = this.y - value;
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* 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.
|
|
* @name Phaser.Circle#bottom
|
|
* @property {number} bottom - Gets or sets the bottom of the circle.
|
|
*/
|
|
Object.defineProperty(Phaser.Circle.prototype, "bottom", {
|
|
|
|
get: function () {
|
|
return this.y + this._radius;
|
|
},
|
|
|
|
set: function (value) {
|
|
|
|
if (value < this.y)
|
|
{
|
|
this._radius = 0;
|
|
this._diameter = 0;
|
|
}
|
|
else
|
|
{
|
|
this.radius = value - this.y;
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* The area of this Circle.
|
|
* @name Phaser.Circle#area
|
|
* @property {number} area - The area of this circle.
|
|
* @readonly
|
|
*/
|
|
Object.defineProperty(Phaser.Circle.prototype, "area", {
|
|
|
|
get: function () {
|
|
|
|
if (this._radius > 0)
|
|
{
|
|
return Math.PI * this._radius * this._radius;
|
|
}
|
|
else
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* Determines whether or not this Circle object is empty. Will return a value of true if the Circle objects diameter is less than or equal to 0; otherwise false.
|
|
* If set to true it will reset all of the Circle objects properties to 0. A Circle object is empty if its diameter is less than or equal to 0.
|
|
* @name Phaser.Circle#empty
|
|
* @property {boolean} empty - Gets or sets the empty state of the circle.
|
|
*/
|
|
Object.defineProperty(Phaser.Circle.prototype, "empty", {
|
|
|
|
get: function () {
|
|
return (this._diameter === 0);
|
|
},
|
|
|
|
set: function (value) {
|
|
|
|
if (value === true)
|
|
{
|
|
this.setTo(0, 0, 0);
|
|
}
|
|
|
|
}
|
|
|
|
});
|
|
|
|
/**
|
|
* Return true if the given x/y coordinates are within the Circle object.
|
|
* @method Phaser.Circle.contains
|
|
* @param {Phaser.Circle} a - The Circle to be checked.
|
|
* @param {number} x - The X value of the coordinate to test.
|
|
* @param {number} y - The Y value of the coordinate to test.
|
|
* @return {boolean} True if the coordinates are within this circle, otherwise false.
|
|
*/
|
|
Phaser.Circle.contains = function (a, x, y) {
|
|
|
|
// Check if x/y are within the bounds first
|
|
if (a.radius > 0 && 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);
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
|
|
};
|
|
|
|
/**
|
|
* Determines whether the two Circle objects match. This method compares the x, y and diameter properties.
|
|
* @method Phaser.Circle.equals
|
|
* @param {Phaser.Circle} a - The first Circle object.
|
|
* @param {Phaser.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.
|
|
*/
|
|
Phaser.Circle.equals = function (a, b) {
|
|
return (a.x == b.x && a.y == b.y && a.diameter == b.diameter);
|
|
};
|
|
|
|
/**
|
|
* Determines whether the two Circle objects intersect.
|
|
* This method checks the radius distances between the two Circle objects to see if they intersect.
|
|
* @method Phaser.Circle.intersects
|
|
* @param {Phaser.Circle} a - The first Circle object.
|
|
* @param {Phaser.Circle} b - The second Circle object.
|
|
* @return {boolean} A value of true if the specified object intersects with this Circle object; otherwise false.
|
|
*/
|
|
Phaser.Circle.intersects = function (a, b) {
|
|
return (Phaser.Math.distance(a.x, a.y, b.x, b.y) <= (a.radius + b.radius));
|
|
};
|
|
|
|
/**
|
|
* Returns a Point object containing the coordinates of a point on the circumference of the Circle based on the given angle.
|
|
* @method Phaser.Circle.circumferencePoint
|
|
* @param {Phaser.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} [out] - 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.
|
|
*/
|
|
Phaser.Circle.circumferencePoint = function (a, angle, asDegrees, out) {
|
|
|
|
if (typeof asDegrees === "undefined") { asDegrees = false; }
|
|
if (typeof out === "undefined") { out = new Phaser.Point(); }
|
|
|
|
if (asDegrees === true)
|
|
{
|
|
angle = Phaser.Math.radToDeg(angle);
|
|
}
|
|
|
|
out.x = a.x + a.radius * Math.cos(angle);
|
|
out.y = a.y + a.radius * Math.sin(angle);
|
|
|
|
return out;
|
|
|
|
};
|
|
|
|
/**
|
|
* Checks if the given Circle and Rectangle objects intersect.
|
|
* @method Phaser.Circle.intersectsRectangle
|
|
* @param {Phaser.Circle} c - The Circle object to test.
|
|
* @param {Phaser.Rectangle} r - The Rectangle object to test.
|
|
* @return {boolean} True if the two objects intersect, otherwise false.
|
|
*/
|
|
Phaser.Circle.intersectsRectangle = 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;
|
|
|
|
};
|
|
|
|
// Because PIXI uses its own Circle, we'll replace it with ours to avoid duplicating code or confusion.
|
|
PIXI.Circle = Phaser.Circle;
|
|
</pre>
|
|
</article>
|
|
</section>
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<footer>
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<span class="copyright">
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Phaser Copyright © 2012-2014 Photon Storm Ltd.
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</span>
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<br />
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<span class="jsdoc-message">
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.0-dev</a>
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on Fri Feb 21 2014 15:36:21 GMT-0000 (GMT) using the <a href="https://github.com/terryweiss/docstrap">DocStrap template</a>.
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