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GetPoint.js
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GetPoint.js
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/**
* @author Richard Davey <rich@phaser.io>
* @copyright 2013-2024 Phaser Studio Inc.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
var Perimeter = require('./Perimeter');
var Point = require('../point/Point');
/**
* Calculates the coordinates of a point at a certain `position` on the Rectangle's perimeter.
*
* The `position` is a fraction between 0 and 1 which defines how far into the perimeter the point is.
*
* A value of 0 or 1 returns the point at the top left corner of the rectangle, while a value of 0.5 returns the point at the bottom right corner of the rectangle. Values between 0 and 0.5 are on the top or the right side and values between 0.5 and 1 are on the bottom or the left side.
*
* @function Phaser.Geom.Rectangle.GetPoint
* @since 3.0.0
*
* @generic {Phaser.Geom.Point} O - [out,$return]
*
* @param {Phaser.Geom.Rectangle} rectangle - The Rectangle to get the perimeter point from.
* @param {number} position - The normalized distance into the Rectangle's perimeter to return.
* @param {(Phaser.Geom.Point|object)} [out] - An object to update with the `x` and `y` coordinates of the point.
*
* @return {Phaser.Geom.Point} The updated `output` object, or a new Point if no `output` object was given.
*/
var GetPoint = function (rectangle, position, out)
{
if (out === undefined) { out = new Point(); }
if (position <= 0 || position >= 1)
{
out.x = rectangle.x;
out.y = rectangle.y;
return out;
}
var p = Perimeter(rectangle) * position;
if (position > 0.5)
{
p -= (rectangle.width + rectangle.height);
if (p <= rectangle.width)
{
// Face 3
out.x = rectangle.right - p;
out.y = rectangle.bottom;
}
else
{
// Face 4
out.x = rectangle.x;
out.y = rectangle.bottom - (p - rectangle.width);
}
}
else if (p <= rectangle.width)
{
// Face 1
out.x = rectangle.x + p;
out.y = rectangle.y;
}
else
{
// Face 2
out.x = rectangle.right;
out.y = rectangle.y + (p - rectangle.width);
}
return out;
};
module.exports = GetPoint;