Add TestBuilder scaleXY function

Author: dr-jts

modules/app/src/main/java/org/locationtech/jtstest/function/AffineTransformationFunctions.java

@@ -111,6 +111,18 @@ public static Geometry scale(Geometry g,
     return trans.transform(g);    
   }
 
+  public static Geometry scaleXY(Geometry g, 
+      @Metadata(title="X Scale factor")
+      double scaleX,
+      @Metadata(title="X Scale factor")
+      double scaleY
+      )
+  {
+    Coordinate centre = envelopeCentre(g);
+    AffineTransformation trans = AffineTransformation.scaleInstance(scaleX, scaleY, centre.x, centre.y);
+    return trans.transform(g);    
+  }
+  
   public static Geometry reflectInX(Geometry g)
   {
     Coordinate centre = envelopeCentre(g);