Merge JigsawX

projects/flixel-desktop-habit-puzzle-game/JigsawX/jigsawx/OpenEllipse.hx

@@ -0,0 +1,51 @@
+package jigsawx;
+import jigsawx.ds.CircleIter;
+import jigsawx.math.Vec2;
+class OpenEllipse {
+    public var rotation:                Float;
+    public var beginAngle:              Float;
+    public var finishAngle:             Float;
+    public var stepAngle:               Float;
+    public var centre:                  Vec2;
+    public var dimensions:              Vec2;
+    private var circleIter:             CircleIter;
+    private var _points:                Array<Vec2>;
+    public function new(){}
+    public function getBegin(): Vec2 {
+        return createPoint( centre, dimensions, beginAngle );
+    }
+    public function getFinish(): Vec2 {
+        return createPoint( centre, dimensions, finishAngle );    
+    }
+    public function getBeginRadius(){
+        return pointDistance( centre, getBegin() );
+    }
+    public function getFinishRadius(){
+        return pointDistance( centre, getFinish() );
+    }
+    private function pointDistance( A: Vec2, B: Vec2 ): Float {
+        var dx         = A.x - B.x;
+        var dy         = A.y - B.y;
+        return Math.sqrt( dx*dx + dy*dy );
+    }
+    public function setUp(){
+        circleIter = CircleIter.pi2pi( beginAngle, finishAngle, stepAngle );
+    }
+    public function getRenderList(): Array<Vec2> { 
+        _points = new Array();
+        if( circleIter == null ) setUp();
+        _points.push( createPoint( centre, dimensions, beginAngle ) );
+        for( theta in CircleIter.pi2pi( beginAngle, finishAngle, stepAngle ).reset() ){
+            _points.push( createPoint( centre, dimensions, theta ) );
+        }
+        return _points;
+    }
+    public function createPoint( centre: Vec2, dimensions: Vec2, theta: Float ): Vec2 {
+        var offSetA     = 3*Math.PI/2 - rotation;// arange so that angle moves from 0... could tidy up dxNew and dyNew!
+        var dx          = dimensions.x*Math.sin( theta );// select the relevant sin cos so that 0 is upwards.
+        var dy          = -dimensions.y*Math.cos( theta );
+        var dxNew       = centre.x -dx*Math.sin( offSetA ) + dy*Math.cos( offSetA );
+        var dyNew       = centre.y -dx*Math.cos( offSetA ) - dy*Math.sin( offSetA );
+        return new Vec2( dxNew, dyNew );
+    }
+}