Fix sample code based on improved usage of Image.Translate(). (#39)

The imaging code of the .NET and Java libraries has been updated significantly and now Image.Translate() takes coordinates as one would expect on the page.
Whereas previously the values were based on internally applying the matrix multiplication backwards.  Because of this change the sample needs to be updated to
produce the correct output.

Co-authored-by: Richard Gailiunas <[email protected]>

ContentModification/ExtendedGraphicStates/ExtendedGraphicStates.cs

@@ -1,7 +1,5 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
 using Datalogics.PDFL;
+using System;
 
 /*
  * 
@@ -12,7 +10,7 @@
  * 
  * This sample program shows how to use the Extended Graphic State object to add graphics parameters to an image.
  * 
- * Copyright (c) 2007-2023, Datalogics, Inc. All rights reserved.
+ * Copyright (c) 2007-2024, Datalogics, Inc. All rights reserved.
  *
  */
 
@@ -37,22 +35,34 @@ static void blendPage(Document doc, Image foregroundImage, Image backgroundImage
             gsText.FillColor = new Color(0, 0, 1.0);
             TextState ts = new TextState();
 
+            double spaceFactor = 18.0;
+            double heightOffset = height - 88.0;
+
             for (int i = 0; i < 16; i++)
             {
                 Image individualForegroundImage = foregroundImage.Clone();
                 Image individualBackgroundImage = backgroundImage.Clone();
 
                 GraphicState gs = individualForegroundImage.GraphicState;
                 individualForegroundImage.Scale(0.125, 0.125);
-                individualForegroundImage.Translate(800, 200 + height * (7 - i));
                 individualBackgroundImage.Scale(0.125, 0.125);
-                individualBackgroundImage.Translate(800, 200 + height * (7 - i));
 
-                // Halfway through, create 2nd column by shifting over and up
+                spaceFactor = 18.0;
+                if (i == 0)
+                {
+                    spaceFactor = 0;
+                }
+
+                //Halfway through, create 2nd column by shifting over and up
                 if (i > 7)
                 {
-                    individualForegroundImage.Translate(2400, height * 8);
-                    individualBackgroundImage.Translate(2400, height * 8);
+                    individualForegroundImage.Translate(400, heightOffset - (72.0 + spaceFactor) * (i - 8));
+                    individualBackgroundImage.Translate(400, heightOffset - (72.0 + spaceFactor) * (i - 8));
+                }
+                else
+                {
+                    individualForegroundImage.Translate(100, heightOffset - (72.0 + spaceFactor) * i);
+                    individualBackgroundImage.Translate(100, heightOffset - (72.0 + spaceFactor) * i);
                 }
 
                 docpage.Content.AddElement(individualBackgroundImage);
@@ -62,9 +72,14 @@ static void blendPage(Document doc, Image foregroundImage, Image backgroundImage
 
                 Matrix m = new Matrix();
                 if (i > 7)
-                    m = m.Translate(480, 750 - ((i - 8) * 100)); // second column
+                {
+                    m = m.Translate(480, heightOffset - (72.0 + spaceFactor) * (i - 8));// second column
+                }
                 else
-                    m = m.Translate(180, 750 - (i * 100)); // first column
+                {
+                    m = m.Translate(180, heightOffset - (72.0 + spaceFactor) * i);// first column
+                }
+
                 m = m.Scale(12.0, 12.0);
 
                 ExtendedGraphicState xgs = new ExtendedGraphicState();
@@ -193,7 +208,6 @@ static void Main(string[] args)
 
                 doc.EmbedFonts();
                 doc.Save(SaveFlags.Full, sOutput);
-
             }
         }
     }