Tweaking paint to ensure that open lines are not closed due to calling Graphics.endFill in the Paint.endPaint method when there's no fill specified. All open lines should use a paint that doesn't specify a fill

Author: alecmce

src/examples/ParabolaFromLineAndVertex.as

@@ -1,5 +1,7 @@
 package examples 
 {
+import ui.Paint;
+
 import as3geometry.geom2D.Line;
 import as3geometry.geom2D.Parabola;
 import as3geometry.geom2D.line.MutableLine;
@@ -15,6 +17,7 @@ package examples
 public class ParabolaFromLineAndVertex extends ExampleBaseSprite
 {
 private var vertexPaint:SolidPaint;
+private var linePaint:Paint;
 
 private var dragMechanism:DragMechanism;
 
@@ -31,6 +34,7 @@ package examples
 public function ParabolaFromLineAndVertex() 
 {
 vertexPaint = new SolidPaint(0xFFFF0000, 0xFF000000, 2);
+linePaint = new SolidPaint(0, 0xFF000000, 2);
 
 dragMechanism = new DragMechanism();
 
@@ -53,7 +57,7 @@ package examples
 lineDrawer = new LineDrawer(_context, line);
 
 parabola = new MutableParabola(_context, c, line);
-parabolaDrawer = new ParabolaDrawer(_context, parabola);
+parabolaDrawer = new ParabolaDrawer(_context, parabola, linePaint);
 
 addChild(lineDrawer);
 addChild(parabolaDrawer);

src/ui/paint/SolidPaint.as

@@ -14,6 +14,8 @@ package ui.paint
 public class SolidPaint implements Paint
 {
 
+private static const ALPHA_SCALAR:Number = 1 / 0xFF;
+
 private var _fill:uint;
 
 private var _stroke:uint;
@@ -44,17 +46,19 @@ package ui.paint
 
 public function beginPaint(graphics:Graphics):void
 {
-graphics.beginFill(_fill & 0xFFFFFF, (_fill >>> 24) / 0xFF);
+if (_fill)
+graphics.beginFill(_fill & 0xFFFFFF, (_fill >>> 24) * ALPHA_SCALAR);
 
 if (_width >= 0)
-graphics.lineStyle(_width, _stroke & 0xFFFFFF, (_stroke >>> 24) / 0xFF);
+graphics.lineStyle(_width, _stroke & 0xFFFFFF, (_stroke >>> 24) * ALPHA_SCALAR);
 else
 graphics.lineStyle();
 }
 
 public function endPaint(graphics:Graphics):void
 {
-graphics.endFill();
+if (_fill)
+graphics.endFill();
 }
 }
 }