Graphics.arc has a new argument segments that allows you to control how many segments are created when the arc is drawn. The default is 40. Use a higher number for more fidelity, i.e. if you find that reversed arcs are not joining up fully (#2064)

README.md

@@ -335,6 +335,7 @@ Please note that Phaser uses a custom build of Pixi and always has done. The fol
 * BaseTexture.destroy no longer checks for the `_pixiId` property on the canvas before removing it from the CanvasPool, meaning it's now destroying a lot more canvas elements than it was in the past!
 * TilingSprite would ignore the `renderable` property, and render it regardless. Now it skips render if `renderable` is false (thanks @Green92 #2214)
 * We have replaced the PolyK Triangulation calls within Pixi with EarCut 2.0.8. This allows for faster polygon triangulation, and also deals with more complex polygons that PolyK would crash on.
+* Graphics.arc has a new argument `segments` that allows you to control how many segments are created when the arc is drawn. The default is 40. Use a higher number for more fidelity, i.e. if you find that reversed arcs are not joining up fully (#2064)
 
 For changes in previous releases please see the extensive [Version History](https://github.com/photonstorm/phaser/blob/master/CHANGELOG.md).
 

src/pixi/primitives/Graphics.js

@@ -398,9 +398,10 @@ PIXI.Graphics.prototype.arcTo = function(x1, y1, x2, y2, radius)
  * @param startAngle {Number} The starting angle, in radians (0 is at the 3 o'clock position of the arc's circle)
  * @param endAngle {Number} The ending angle, in radians
  * @param anticlockwise {Boolean} Optional. Specifies whether the drawing should be counterclockwise or clockwise. False is default, and indicates clockwise, while true indicates counter-clockwise.
+ * @param segments {Number} Optional. The number of segments to use when calculating the arc. The default is 40. If you need more fidelity use a higher number.
  * @return {Graphics}
  */
-PIXI.Graphics.prototype.arc = function(cx, cy, radius, startAngle, endAngle, anticlockwise)
+PIXI.Graphics.prototype.arc = function(cx, cy, radius, startAngle, endAngle, anticlockwise, segments)
 {
     //  If we do this we can never draw a full circle
     if (startAngle === endAngle)
@@ -409,6 +410,7 @@ PIXI.Graphics.prototype.arc = function(cx, cy, radius, startAngle, endAngle, ant
     }
 
     if (anticlockwise === undefined) { anticlockwise = false; }
+    if (segments === undefined) { segments = 40; }
 
     if (!anticlockwise && endAngle <= startAngle)
     {
@@ -420,7 +422,7 @@ PIXI.Graphics.prototype.arc = function(cx, cy, radius, startAngle, endAngle, ant
     }
 
     var sweep = anticlockwise ? (startAngle - endAngle) * -1 : (endAngle - startAngle);
-    var segs =  Math.ceil(Math.abs(sweep) / (Math.PI * 2)) * 40;
+    var segs =  Math.ceil(Math.abs(sweep) / (Math.PI * 2)) * segments;
 
     //  Sweep check - moved here because we don't want to do the moveTo below if the arc fails
     if (sweep === 0)