chore: 优化线的算法策略

Author: YCode

YCode.Designer.Fluxo/FluxoLineContainer.cs

@@ -13,6 +13,7 @@ static FluxoLineContainer()
     }
 
     private FluxoDesigner? _designer;
+    private FluxoLineFactory? _factory;
 
     public override void OnApplyTemplate()
     {
@@ -21,6 +22,8 @@ public override void OnApplyTemplate()
         if (this.FindParent<FluxoDesigner>() is { } designer)
         {
             _designer = designer;
+
+            _factory = new FluxoLineFactory(_designer);
         }
     }
 
@@ -31,6 +34,13 @@ protected override DependencyObject GetContainerForItemOverride()
 
     protected override bool IsItemItsOwnContainerOverride(object item)
     {
-        return _designer?.IsLineItsOwnContainerOverride(this,item) ?? base.IsItemItsOwnContainerOverride(item);
+        return _designer?.IsLineItsOwnContainerOverride(this, item) ?? base.IsItemItsOwnContainerOverride(item);
+    }
+
+    internal IFluxoLineGeometry GetLineProvider(LineType type)
+    {
+        return _factory?.GetLine(type) ??
+               throw new InvalidOperationException(
+                   $"factory is missing {nameof(FluxoLineFactory)}.");
     }
 }

YCode.Designer.Fluxo/Lines/FluxoLine.cs

@@ -16,7 +16,6 @@ static FluxoLine()
     private readonly FluxoDesigner _designer;
     private readonly FluxoLineContainer _container;
     private readonly StreamGeometry _geometry;
-    private readonly FluxoLineFactory _factory;
 
     public FluxoLine(FluxoDesigner designer, FluxoLineContainer container)
     {
@@ -29,8 +28,6 @@ public FluxoLine(FluxoDesigner designer, FluxoLineContainer container)
             FillRule = FillRule.EvenOdd
         };
 
-        _factory = new FluxoLineFactory(_designer);
-
         this.Loaded += OnLoaded;
     }
 
@@ -153,7 +150,7 @@ protected override void OnRender(DrawingContext drawingContext)
     {
         base.OnRender(drawingContext);
 
-        var line = _factory.GetLine(_designer.LineType);
+        var line = _container.GetLineProvider(_designer.LineType);
 
         var p = line?.GetPoint(0.1);
 
@@ -166,7 +163,7 @@ protected override void OnRender(DrawingContext drawingContext)
 
     private (Point, Point) DrawLine(StreamGeometryContext context, FluxoNode source, FluxoNode target)
     {
-        var line = _factory.GetLine(_designer.LineType);
+        var line = _container.GetLineProvider(_designer.LineType);
 
         var @params = this.GetParameter(source, target);
 

YCode.Designer.Fluxo/Lines/Impl/FluxoStepLine.cs

@@ -160,8 +160,8 @@ static bool IsOppositePosition(FluxoLinePosition sourcePosition, FluxoLinePositi
             var factor = extra / distance;
 
             return new Point(
-                prePoint.X + (factor * this.Points[i].X - prePoint.X),
-                prePoint.Y + (factor * this.Points[i].Y - prePoint.Y));
+                prePoint.X + (factor * (this.Points[i].X - prePoint.X)),
+                prePoint.Y + (factor * (this.Points[i].Y - prePoint.Y)));
         }
 
         prePoint = this.Points[i];