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Added SplineCurve

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This commit is contained in:
Richard Davey 2017-09-21 02:31:11 +01:00
parent b63c8ad135
commit cf4b97cbdc
2 changed files with 50 additions and 1 deletions
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3
v3/src/paths/curves/index.js
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@ -4,7 +4,8 @@ module.exports = {
CubicBezier: require('./cubicbezier/CubicBezierCurve'),
Ellipse: require('./ellipse/EllipseCurve'),
Line: require('./line/LineCurve')
Line: require('./line/LineCurve'),
Spline: require('./spline/SplineCurve')
};

48
v3/src/paths/curves/spline/SplineCurve.js Normal file
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@ -0,0 +1,48 @@
// Based on the three.js Curve classes created by [zz85](http://www.lab4games.net/zz85/blog)
var CatmullRom = require('../../../math/CatmullRom');
var Class = require('../../../utils/Class');
var Curve = require('../Curve');
var Vector2 = require('../../../math/Vector2');
// Phaser.Curves.Spline
var SplineCurve = new Class({
Extends: Curve,
initialize:
// Array of vec2s
function SplineCurve (points)
{
if (points === undefined) { points = []; }
Curve.call(this);
this.points = points;
},
getPoint: function (t, out)
{
if (out === undefined) { out = new Vector2(); }
var points = this.points;
var point = (points.length - 1) * t;
var intPoint = Math.floor(point);
var weight = point - intPoint;
var p0 = points[ (intPoint === 0) ? intPoint : intPoint - 1 ];
var p1 = points[ intPoint ];
var p2 = points[ (intPoint > points.length - 2) ? points.length - 1 : intPoint + 1 ];
var p3 = points[ (intPoint > points.length - 3) ? points.length - 1 : intPoint + 2 ];
return out.set(CatmullRom(weight, p0.x, p1.x, p2.x, p3.x), CatmullRom(weight, p0.y, p1.y, p2.y, p3.y));
}
});
module.exports = SplineCurve;