mirror of
https://github.com/photonstorm/phaser
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316 lines
No EOL
10 KiB
TypeScript
316 lines
No EOL
10 KiB
TypeScript
/// <reference path="../_definitions.ts" />
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/**
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* Phaser - Circle
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*
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* A Circle object is an area defined by its position, as indicated by its center point (x,y) and diameter.
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*/
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module Phaser {
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export class 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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constructor(x: number = 0, y: number = 0, diameter: number = 0) {
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this.setTo(x, y, diameter);
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}
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private _diameter: number = 0;
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private _radius: number = 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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public x: number = 0;
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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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public y: number = 0;
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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 diameter(): number {
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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 diameter(value: number) {
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if (value > 0)
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{
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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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* 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 radius(): number {
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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 radius(value: number) {
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if (value > 0)
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{
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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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* 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(): number {
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return 2 * (Math.PI * 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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* @return {Number}
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**/
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get bottom(): number {
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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 bottom(value: number) {
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if (value < this.y)
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{
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this._radius = 0;
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this._diameter = 0;
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}
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else
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{
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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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* 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 left(): number {
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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 left(value: number) {
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if (value > this.x)
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{
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this._radius = 0;
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this._diameter = 0;
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}
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else
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{
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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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* 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 right(): number {
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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 right(value: number) {
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if (value < this.x)
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{
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this._radius = 0;
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this._diameter = 0;
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}
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else
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{
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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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* 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 top(): number {
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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 top(value: number) {
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if (value > this.y)
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{
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this._radius = 0;
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this._diameter = 0;
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}
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else
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{
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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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* 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 area(): number {
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if (this._radius > 0)
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{
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return Math.PI * this._radius * this._radius;
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}
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else
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{
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return 0;
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}
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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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public setTo(x: number, y: number, diameter: number): Circle {
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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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public copyFrom(source: any): Circle {
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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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* 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 empty(): bool {
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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 empty(value: bool) {
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this.setTo(0, 0, 0);
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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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public offset(dx: number, dy: number): Circle {
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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.
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* @return {Circle} This Circle object.
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**/
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public offsetPoint(point: Point): Circle {
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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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public toString(): string {
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return "[{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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} |