Implement #isFirst() / #isLast() tests on Segment and Curve.

src/path/Curve.js

@@ -298,6 +298,26 @@ var Curve = Base.extend(/** @lends Curve# */{
                 || this._path._closed && curves[curves.length - 1]) || null;
     },
 
+    /**
+     * Checks if the this is the first curve in the {@link Path#curves} array.
+     *
+     * @return {Boolean} {@true if this is the first curve}
+     */
+    isFirst: function() {
+        return this._segment1._index === 0;
+    },
+
+    /**
+     * Checks if the this is the last curve in the {@link Path#curves} array.
+     *
+     * @return {Boolean} {@true if this is the last curve}
+     */
+    isLast: function() {
+        var path = this._path;
+        return path && this._segment1._index === path._curves.length - 1
+                || false;
+    },
+
     /**
      * Specifies whether the points and handles of the curve are selected.
      *
@@ -877,7 +897,7 @@ statics: {
      * @return {Boolean} {@true if the curve is parametrically linear}
      */
 
-   /**
+    /**
      * Checks if the the two curves describe straight lines that are
      * collinear, meaning they run in parallel.
      *
@@ -889,7 +909,7 @@ statics: {
                 && this.getVector().isCollinear(curve.getVector());
     },
 
-   /**
+    /**
      * Checks if the curve is a straight horizontal line.
      *
      * @return {Boolean} {@true if the line is horizontal}
@@ -899,7 +919,7 @@ statics: {
                 < /*#=*/Numerical.GEOMETRIC_EPSILON;
     },
 
-   /**
+    /**
      * Checks if the curve is a straight vertical line.
      *
      * @return {Boolean} {@true if the line is vertical}

src/path/Segment.js

@@ -392,6 +392,27 @@ var Segment = Base.extend(/** @lends Segment# */{
                 || this._path._closed && segments[segments.length - 1]) || null;
     },
 
+    /**
+     * Checks if the this is the first segment in the {@link Path#segments}
+     * array.
+     *
+     * @return {Boolean} {@true if this is the first segment}
+     */
+    isFirst: function() {
+        return this._index === 0;
+    },
+
+    /**
+     * Checks if the this is the last segment in the {@link Path#segments}
+     * array.
+     *
+     * @return {Boolean} {@true if this is the last segment}
+     */
+    isLast: function() {
+        var path = this._path;
+        return path && this._index === path._segments.length - 1 || false;
+    },
+
     /**
      * Reverses the {@link #handleIn} and {@link #handleOut} vectors of this
      * segment. Note: the actual segment is modified, no copy is created.