Added SplineCurve

Author: photonstorm

v3/src/paths/curves/index.js

@@ -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')
 
 };
 

v3/src/paths/curves/spline/SplineCurve.js

@@ -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;