Update tron skin to use new arc function

index.html

@@ -24,33 +24,25 @@
                         // "tron" case
                         if(this.$.data('skin') == 'tron') {
 
-                            var a = this.angle(this.cv)  // Angle
-                                , sa = this.startAngle          // Previous start angle
-                                , sat = this.startAngle         // Start angle
-                                , ea                            // Previous end angle
-                                , eat = sat + a                 // End angle
+                            this.cursorExt = 0.3;
+
+                            var a = this.arc(this.cv)  // Arc
+                                , pa                   // Previous arc
                                 , r = 1;
 
                             this.g.lineWidth = this.lineWidth;
 
-                            this.o.cursor
-                                && (sat = eat - 0.3)
-                                && (eat = eat + 0.3);
-
                             if (this.o.displayPrevious) {
-                                ea = this.startAngle + this.angle(this.v);
-                                this.o.cursor
-                                    && (sa = ea - 0.3)
-                                    && (ea = ea + 0.3);
+                                pa = this.arc(this.v);
                                 this.g.beginPath();
                                 this.g.strokeStyle = this.pColor;
-                                this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, sa, ea, false);
+                                this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, pa.s, pa.e, pa.d);
                                 this.g.stroke();
                             }
 
                             this.g.beginPath();
                             this.g.strokeStyle = r ? this.o.fgColor : this.fgColor ;
-                            this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, sat, eat, false);
+                            this.g.arc(this.xy, this.xy, this.radius - this.lineWidth, a.s, a.e, a.d);
                             this.g.stroke();
 
                             this.g.lineWidth = 2;