feat: 直线计算点位

Author: YCode

YCode.Designer.Demo/Demo/Playground/Playground.xaml

@@ -38,6 +38,7 @@
                              Mounting="OnMounting"
                              Mounted="OnMounted"
                              GridType="Dot"
+                             LineType="Straight"
                              Orientation="Vertical"
                              ToolTemplate="{StaticResource ToolDataTemplate}"
                              ItemContainerStyle="{StaticResource FluxoNodeStyle}"

YCode.Designer.Fluxo/Lines/FluxoLine.cs

@@ -149,6 +149,21 @@ protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
         base.OnPropertyChanged(e);
     }
 
+    protected override void OnRender(DrawingContext drawingContext)
+    {
+        base.OnRender(drawingContext);
+
+        var line = _factory.GetLine(_designer.LineType);
+
+        var p = line?.GetPoint(0.1);
+
+        if (p.HasValue)
+        {
+            drawingContext.DrawRectangle(Brushes.Orange, new Pen(Brushes.Transparent, 1),
+                new Rect(p.Value.X-5, p.Value.Y-5, 10, 10));
+        }
+    }
+
     private (Point, Point) DrawLine(StreamGeometryContext context, FluxoNode source, FluxoNode target)
     {
         var line = _factory.GetLine(_designer.LineType);

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

@@ -61,22 +61,10 @@ public override Point GetPoint(double target)
         var start = this.Points.FirstOrDefault();
         var end = this.Points.LastOrDefault();
 
-        var currentLength = this.GetLength();
+        var x = start.X + (end.X - start.X) * target;
+        var y = start.Y + (end.Y - start.Y) * target;
 
-        var targetLength = currentLength * target;
-
-        var distance = Point.Subtract(end, start).Length;
-
-        if (currentLength + distance >= targetLength)
-        {
-            var extra = targetLength - currentLength;
-
-            var factor = extra / distance;
-
-            return new Point(start.X + factor * (end.X - start.X), start.Y + factor * (end.Y - start.Y));
-        }
-
-        return default;
+        return new Point(x, y);
     }
 
     public override double GetLength()