add resize

DrawFigureLibrary/Figures/PolygonFigure.cs

@@ -1,4 +1,5 @@
-using System.Windows;
+using System;
+using System.Windows;
 using System.Windows.Media;
 
 namespace DrawFigureLibrary.Figures
@@ -9,13 +10,14 @@ namespace DrawFigureLibrary.Figures
 
         public PolygonFigure(string name, Point[] points) : base(name, 0, 0, 0, 0)
         {
-            if (points == null || points.Length < 3) throw new ArgumentException("Многоугольник должен иметь минимум 3 точки.");
+            if (points == null || points.Length < 3)
+                throw new ArgumentException("Многоугольник должен иметь минимум 3 точки.");
 
             Points = points;
             RecalcBounds();
         }
 
-        private void RecalcBounds()
+        protected void RecalcBounds()
         {
             double minX = Points.Min(p => p.X);
             double minY = Points.Min(p => p.Y);
@@ -45,10 +47,47 @@ namespace DrawFigureLibrary.Figures
 
             if (Check(this, deltaX, deltaY, Init.DrawingImage))
             {
-                for (int i = 0; i < Points.Length; i++) Points[i] = new Point( Points[i].X + deltaX, Points[i].Y + deltaY );
+                for (int i = 0; i < Points.Length; i++)
+                    Points[i] = new Point(Points[i].X + deltaX, Points[i].Y + deltaY);
 
                 RecalcBounds();
             }
         }
+
+        public override void ResizeTo(int newW, int newH)
+        {
+            if (newW <= 0 || newH <= 0) throw new ArgumentException("Размеры должны быть > 0");
+
+            double oldW = w;
+            double oldH = h;
+
+            if (oldW <= 0 || oldH <= 0)
+            {
+                RecalcBounds();
+                oldW = w;
+                oldH = h;
+
+                if (oldW <= 0 || oldH <= 0) throw new ArgumentException("Нельзя изменить размер: вырожденный многоугольник.");
+            }
+
+            double sx = newW / oldW;
+            double sy = newH / oldH;
+
+            double ox = x;
+            double oy = y;
+
+            for (int i = 0; i < Points.Length; i++)
+            {
+                double px = Points[i].X;
+                double py = Points[i].Y;
+
+                double nx = ox + (px - ox) * sx;
+                double ny = oy + (py - oy) * sy;
+
+                Points[i] = new Point(nx, ny);
+            }
+
+            RecalcBounds();
+        }
     }
-}
+}