Transformer Class

using Leadtools.Codecs; 
using Leadtools.Drawing; 
 
using Leadtools.WinForms; 
 
 
public void CenterAtPoint(RasterImageViewer viewer) 
{ 
   // Minimum and maximum scale factors allowed (change if you have to) 
   const double minimumScaleFactor = 0.05; 
   const double maximumScaleFactor = 11;          
 
   // Normalize the scale factor based on min and max 
   scaleFactor = Math.Max(minimumScaleFactor, Math.Min(maximumScaleFactor, scaleFactor)); 
 
   // Check if we need to change the scale factor for the viewer 
   if (viewer.ScaleFactor != scaleFactor) 
   { 
      viewer.BeginUpdate(); 
 
      // Get the current center in logical units 
      // We will use this point later to re-center the viewer 
 
      // Get what you see in physical coordinates 
      Rectangle rc = Rectangle.Intersect(viewer.PhysicalViewRectangle, viewer.ClientRectangle); 
 
      // Get the center of what you see in physical coordinates 
      PointF center = new PointF(rc.Left + rc.Width / 2, rc.Top + rc.Height / 2); 
 
      Transformer t = new Transformer(viewer.Transform); 
      // Get the center of what you see in logical coordinates 
      center = t.PointToLogical(center); 
 
      // Set the new scale factor 
      viewer.ScaleFactor = scaleFactor; 
 
      // Bring the original center into the view center 
 
      t = new Transformer(viewer.Transform); 
      // Get the center of what you saw before the zoom in physical coordinates 
      center = t.PointToPhysical(center); 
 
      // Bring the old center into the center of the view 
      viewer.CenterAtPoint(Point.Round(center)); 
      viewer.EndUpdate(); 
 
      //Code below is informational and only provides values for Transformer members 
      // and does not impact the image in this demo: 
 
      // Get the logical coordinates of the Rectangle 
      RectangleF recLogical = t.RectangleToLogical(rc); 
 
      // Get the physical coordinates of the Rectangle 
      RectangleF recPhysical = t.RectangleToPhysical(rc); 
 
      // Get the logical length 
      float xlengthLogical = t.LengthToLogical(center.X); 
 
      // Get the logical length 
      float xlengthPhysical = t.LengthToPhysical(center.X); 
 
      Console.WriteLine($"recLogical: {recLogical}\nrecPhysical{recPhysical}\nxlengthLogical :{xlengthLogical}\nxlengthPhysical:{xlengthPhysical}"); 
 
      // Convert input logical points to physical points 
      // Define logical points 
      PointF[] points = new PointF[2]; 
      points[0].X = 10.00F; 
      points[0].Y = 10.00F; 
      points[0].X = 20.00F; 
      points[0].Y = 20.00F; 
      // Convert to physical points 
      PointF[] physicalPoints = Transformer.TransformPoints(points, viewer.Transform); 
      for (int i = 0; i < physicalPoints.Length; i++) 
      { 
         Console.WriteLine($"Logical Points: {physicalPoints[i].X}, {physicalPoints[i].Y}"); 
         Console.WriteLine($"Physical Points:{physicalPoints[i].X}, {physicalPoints[i].Y}"); 
      } 
   } 
}