In This Topic ▼

Transform Property

Summary

Gets the display matrix for the viewer.

Syntax

C++/CLI

C++

public Matrix Transform { get; }

[BrowsableAttribute(false)] 
public: 
property Matrix^ Transform { 
   Matrix^ get(); 
}

public:  
   property Matrix^ Transform 
   { 
      Matrix^ get() 
   }

Property Value

The display matrix for the viewer.

Remarks

Use the Transform property to get the current matrix which is used to transform the image display. The matrix is used to transform from physical to logical coordinates and vice versa.

Example

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
///  
// center the loaded image in the middle of rasterImageViewer if the image smaller than the viewer size  
private void centerImage(RasterImageViewer viewer) 
{ 
   // do center only when RasterViewerSizeMode == Normal 
   if (viewer.SizeMode == RasterPaintSizeMode.Normal) 
   { 
      if (viewer.IsImageAvailable == true) 
      { 
         if (viewer.Image != null) 
         { 
            int viewerWidth = viewer.Right - viewer.Left; 
            int viewerHeight = viewer.Bottom - viewer.Top; 
            int imageWidth = (int)(viewer.LogicalViewRectangle.Width * viewer.ScaleFactor); 
            int imageHeight = (int)(viewer.LogicalViewRectangle.Height * viewer.ScaleFactor); 
 
            if (imageWidth < viewerWidth) 
               viewer.BorderPadding.Left = (viewerWidth - imageWidth) / 2; 
            else 
               viewer.BorderPadding.Left = 0; 
 
            if (imageHeight < viewerHeight) 
               viewer.BorderPadding.Top = (viewerHeight - imageHeight) / 2; 
            else 
               viewer.BorderPadding.Top = 0; 
         } 
      } 
   } 
} 
 
private void viewer_TransformedChanged(object sender, EventArgs e) 
{ 
   RasterImageViewer viewer = sender as RasterImageViewer; 
   string s = string.Format("Transform: {0} {1} {2} {3} {4} {5}", 
      viewer.Transform.Elements[0], 
      viewer.Transform.Elements[1], 
      viewer.Transform.Elements[2], 
      viewer.Transform.Elements[3], 
      viewer.Transform.Elements[4], 
      viewer.Transform.Elements[5]); 
 
   Console.WriteLine(s); 
} 
 
public void RasterImageViewer_BeginUpdate(RasterImageViewer viewer) 
{ 
   viewer.TransformChanged += new EventHandler(viewer_TransformedChanged); 
 
   viewer.BeginUpdate();  // suspend painting of the image  
   viewer.ScaleFactor = viewer.ScaleFactor * 0.9F; 
   centerImage(viewer); 
   viewer.EndUpdate(); // start painting of the image  
 
   viewer.TransformChanged -= new EventHandler(viewer_TransformedChanged); 
}

Requirements

Target Platforms