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<h1 class="file-heading">File: src\geom\Ray.ts</h1>
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<pre class="code prettyprint linenums">
/**
*
* @module Kiwi
* @submodule Geom
*/
module Kiwi.Geom {
/**
* Represents a halfline. The ray starts at the first point
* and extends infinitely in the direction of the second.
*
* @class Ray
* @namespace Kiwi.Geom
* @extends Kiwi.Geom.Line
* @constructor
* @param [x1=0] {Number} Starting location of the ray on the x-axis
* @param [y1=0] {Number} Starting location of the ray on the y-axis
* @param [x2=0] {Number} End location of the ray on the x-axis.
* Used to calculate direction so it isn't really the 'end' location.
* @param [y2=0] {Number} End location of the ray on the y-axis.
* Used to calculate direction so it isn't really the 'end' location.
* @return {Kiwi.Geom.Ray} This object
*/
export class Ray extends Line {
constructor(x1: number = 0, y1: number = 0, x2: number = 0, y2: number = 0) {
super( x1, y1, x2, y2 );
}
/**
* The type of this object.
* @method objType
* @return {String} "Ray"
* @public
*/
public objType() {
return "Ray";
}
/**
* Makes a copy of this Ray, either as a new Ray object, or
* makes a passed Ray a copy of this one.
*
* @method clone
* @param [output] {Kiwi.Geom.Ray}
* @return {Kiwi.Geom.Ray}
* @public
*/
public clone(output: Line = new Ray): Line {
return output.setTo(this.x1, this.y1, this.x2, this.y2);
}
/**
* Check if the Ray passes through a point.
* @method isPointOnRay
* @param x {Number}
* @param y {Number}
* @return {boolean}
* @public
*/
public isPointOnRay(x: number, y: number): boolean {
if ((x - this.x1) * (this.y2 - this.y1) === (this.x2 - this.x1) * (y - this.y1)) {
if (Math.atan2(y-this.y1, x-this.x1) == Math.atan2(this.y2-this.y1, this.x2- this.x1)){
return true
}
}
return false;
}
/**
* Get a string representation of the ray.
* @method toString
* @return {String}
* @public
*/
public toString(): string {
return "[{Ray (x1=" + this.x1 + " y1=" + this.y1 + " x2=" + this.x2 + " y2=" + this.y2 + ")}]";
}
}
}
</pre>
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