LEADTOOLS (Leadtools assembly)
LEAD Technologies, Inc

RasterDefaults Class

Example 





Members 
Leadtools Namespace : RasterDefaults Class
Specifies the default extra values used when creating RasterImage objects. .NET support Silverlight support WinRT support
Object Model
RasterDefaults ClassRasterMemoryThreshold Structure
Syntax
public static class RasterDefaults 
'Declaration
 
Public MustInherit NotInheritable Class RasterDefaults 
'Usage
 
Dim instance As RasterDefaults
public sealed static class RasterDefaults 
function Leadtools.RasterDefaults()
public ref class RasterDefaults abstract sealed
Remarks

You can use the RasterDefaults class to specify extra attributes used when creating a RasterImage object

For example, you can use XResolution and YResolution to set the physical resolution (DPI) of all the RasterImage objects creates afterwards.

You can use DitheringMethod to specifies the default dithering method to use when converting an image from 64, 48, 32, 24, or 16 bits per pixel to 8 bits per pixel or fewer.

MemoryFlags and MemoryThreshold controls how newly created images use the system memory. The TemporaryDirectory controls where disk-based images are stored.

Example
  
Public Sub RasterDefaultsExample()
   ShowValues()

   ' Create a raster image with current DPI
   Dim image1 As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, IntPtr.Zero, 0)
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution)

   ' Change the resolution
   Dim xOldResolution As Integer = RasterDefaults.XResolution
   Dim yOldResolution As Integer = RasterDefaults.YResolution
   Dim xNewResolution As Integer = 196
   Dim yNewResolution As Integer = 196
   RasterDefaults.XResolution = xNewResolution
   RasterDefaults.YResolution = yNewResolution
   ShowValues()

   ' Create another raster image
   ' Create a raster image with current DPI
   Dim image2 As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, IntPtr.Zero, 0)
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution)
   Debug.Assert(image2.XResolution = xNewResolution)
   Debug.Assert(image2.YResolution = yNewResolution)

   ' Reset old values
   RasterDefaults.XResolution = xOldResolution
   RasterDefaults.YResolution = yOldResolution

   image1.Dispose()
   image2.Dispose()
End Sub

Private Sub ShowValues()
   Console.WriteLine("Current defaults:")
   Console.WriteLine("MaximumThreadCount: {0}", RasterDefaults.MaximumThreadCount)
   Console.WriteLine("XResolution: {0}", RasterDefaults.XResolution)
   Console.WriteLine("YResolution: {0}", RasterDefaults.YResolution)
   Console.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod)
   Console.WriteLine("MemoryFlags: {0}", RasterDefaults.MemoryFlags)

   Dim threshold As RasterMemoryThreshold = RasterDefaults.MemoryThreshold
   Console.WriteLine("MemoryThreshold.TiledThreshold: {0}", threshold.TiledThreshold)
   Console.WriteLine("MemoryThreshold.MaximumConventionalSize: {0}", threshold.MaximumConventionalSize)
   Console.WriteLine("MemoryThreshold.TileSize: {0}", threshold.TileSize)
   Console.WriteLine("MemoryThreshold.ConventionalTiles: {0}", threshold.ConventionalTiles)
   Console.WriteLine("MemoryThreshold.ConventionalBuffers: {0}", threshold.ConventionalBuffers)

   Console.WriteLine("TemporaryDirectory: {0}", RasterDefaults.TemporaryDirectory)
End Sub
public void RasterDefaultsExample()
{
   ShowValues();

   // Create a raster image with current DPI
   RasterImage image1 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null,
      IntPtr.Zero,
      0);
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution);

   // Change the resolution
   int xOldResolution = RasterDefaults.XResolution;
   int yOldResolution = RasterDefaults.YResolution;
   int xNewResolution = 196;
   int yNewResolution = 196;
   RasterDefaults.XResolution = xNewResolution;
   RasterDefaults.YResolution = yNewResolution;
   ShowValues();

   // Create another raster image
   // Create a raster image with current DPI
   RasterImage image2 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null,
      IntPtr.Zero,
      0);
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution);
   Debug.Assert(image2.XResolution == xNewResolution);
   Debug.Assert(image2.YResolution == yNewResolution);

   // Reset old values
   RasterDefaults.XResolution = xOldResolution;
   RasterDefaults.YResolution = yOldResolution;

   image1.Dispose();
   image2.Dispose();
}

void ShowValues()
{
   Console.WriteLine("Current defaults:");
   Console.WriteLine("MaximumThreadCount: {0}", RasterDefaults.MaximumThreadCount);
   Console.WriteLine("XResolution: {0}", RasterDefaults.XResolution);
   Console.WriteLine("YResolution: {0}", RasterDefaults.YResolution);
   Console.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod);
   Console.WriteLine("MemoryFlags: {0}", RasterDefaults.MemoryFlags);

   RasterMemoryThreshold threshold = RasterDefaults.MemoryThreshold;
   Console.WriteLine("MemoryThreshold.TiledThreshold: {0}", threshold.TiledThreshold);
   Console.WriteLine("MemoryThreshold.MaximumConventionalSize: {0}", threshold.MaximumConventionalSize);
   Console.WriteLine("MemoryThreshold.TileSize: {0}", threshold.TileSize);
   Console.WriteLine("MemoryThreshold.ConventionalTiles: {0}", threshold.ConventionalTiles);
   Console.WriteLine("MemoryThreshold.ConventionalBuffers: {0}", threshold.ConventionalBuffers);

   Console.WriteLine("TemporaryDirectory: {0}", RasterDefaults.TemporaryDirectory);
}
function RasterDefaultsExample()
{
   with ( Leadtools ) 
   {
      Tools.SetLicense();
      ShowValues();

      // Create a raster image with current DPI
      var image1 = new RasterImage(
         RasterMemoryFlags.conventional,
         100,
         100,
         24,
         RasterByteOrder.bgr,
         RasterViewPerspective.topLeft,
         null);

      console.info ("Resolution of created image is " + image1.XResolution + " by " + image1.YResolution + " DPI");

      // Change the resolution
      var xOldResolution = RasterDefaults.xresolution;
      var yOldResolution = RasterDefaults.yresolution;
      var xNewResolution = 196;
      var yNewResolution = 196;
      RasterDefaults.xresolution = xNewResolution;
      RasterDefaults.yresolution = yNewResolution;
      ShowValues();

      // Create another raster image
      // Create a raster image with current DPI
      var image2 = new RasterImage(
         RasterMemoryFlags.conventional,
         100,
         100,
         24,
         RasterByteOrder.bgr,
         RasterViewPerspective.topLeft,
         null);
      console.info("Resolution of created image is " + image2.xresolution + " by " + image2.yresolution + " DPI" );
      console.assert (image2.xresolution == xNewResolution, "image2.XResolution == xNewResolution");
      console.assert (image2.yresolution == yNewResolution, "image2.YResolution == yNewResolution");

      // Reset old values
      RasterDefaults.xresolution = xOldResolution;
      RasterDefaults.yresolution = yOldResolution;

      image1.close();
      image2.close();
   }
}

function ShowValues()
{
   with ( Leadtools ) 
   {
      console.info("Current defaults:");
   
      console.info("XResolution: ", RasterDefaults.xresolution);
      console.info("YResolution: ", RasterDefaults.yresolution);
      console.info("DitheringMethod: ", RasterDefaults.ditheringMethod);
      console.info("MemoryFlags: ", RasterDefaults.memoryFlags);

      var threshold = RasterDefaults.memoryThreshold;
      console.info("MemoryThreshold.TiledThreshold: ", threshold.tiledThreshold);
      console.info("MemoryThreshold.MaximumConventionalSize: ", threshold.maximumConventionalSize);
      console.info("MemoryThreshold.TileSize: ", threshold.tileSize);
      console.info("MemoryThreshold.ConventionalTiles: ", threshold.conventionalTiles);
      console.info("MemoryThreshold.ConventionalBuffers: ", threshold.conventionalBuffers);

      console.info("TemporaryDirectory: ", RasterDefaults.temporaryDirectory);
   }
}
[TestMethod]
public void RasterDefaultsExample()
{
   ShowValues();
   // Create a raster image with current DPI
   RasterImage image1 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null);
   Debug.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution);

   // Change the resolution
   int xOldResolution = RasterDefaults.XResolution;
   int yOldResolution = RasterDefaults.YResolution;
   int xNewResolution = 196;
   int yNewResolution = 196;
   RasterDefaults.XResolution = xNewResolution;
   RasterDefaults.YResolution = yNewResolution;
   ShowValues();

   // Create another raster image
   // Create a raster image with current DPI
   RasterImage image2 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null);
   Debug.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution);
   Assert.IsTrue(image2.XResolution == xNewResolution);
   Assert.IsTrue(image2.YResolution == yNewResolution);

   // Reset old values
   RasterDefaults.XResolution = xOldResolution;
   RasterDefaults.YResolution = yOldResolution;

   image1.Dispose();
   image2.Dispose();
}

void ShowValues()
{
   Debug.WriteLine("Current defaults:");
   //Debug.WriteLine("MaximumThreadCount: {0}", RasterDefaults.MaximumThreadCount);
   Debug.WriteLine("XResolution: {0}", RasterDefaults.XResolution);
   Debug.WriteLine("YResolution: {0}", RasterDefaults.YResolution);
   Debug.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod);
   Debug.WriteLine("MemoryFlags: {0}", RasterDefaults.MemoryFlags);

   RasterMemoryThreshold threshold = RasterDefaults.MemoryThreshold;
   Debug.WriteLine("MemoryThreshold.TiledThreshold: {0}", threshold.TiledThreshold);
   Debug.WriteLine("MemoryThreshold.MaximumConventionalSize: {0}", threshold.MaximumConventionalSize);
   Debug.WriteLine("MemoryThreshold.TileSize: {0}", threshold.TileSize);
   Debug.WriteLine("MemoryThreshold.ConventionalTiles: {0}", threshold.ConventionalTiles);
   Debug.WriteLine("MemoryThreshold.ConventionalBuffers: {0}", threshold.ConventionalBuffers);

   Debug.WriteLine("TemporaryDirectory: {0}", RasterDefaults.TemporaryDirectory);
}
public void RasterDefaultsExample()
{
   ShowValues();

   // Create a raster image with current DPI
   RasterImage image1 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null,
      null,
      0);
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution);

   // Change the resolution
   int xOldResolution = RasterDefaults.XResolution;
   int yOldResolution = RasterDefaults.YResolution;
   int xNewResolution = 196;
   int yNewResolution = 196;
   RasterDefaults.XResolution = xNewResolution;
   RasterDefaults.YResolution = yNewResolution;
   ShowValues();

   // Create another raster image
   // Create a raster image with current DPI
   RasterImage image2 = new RasterImage(
      RasterMemoryFlags.Conventional,
      100,
      100,
      24,
      RasterByteOrder.Bgr,
      RasterViewPerspective.TopLeft,
      null,
      null,
      0);
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution);
   Debug.Assert(image2.XResolution == xNewResolution);
   Debug.Assert(image2.YResolution == yNewResolution);

   // Reset old values
   RasterDefaults.XResolution = xOldResolution;
   RasterDefaults.YResolution = yOldResolution;

   image1.Dispose();
   image2.Dispose();
}

void ShowValues()
{
   Console.WriteLine("Current defaults:");
   Console.WriteLine("XResolution: {0}", RasterDefaults.XResolution);
   Console.WriteLine("YResolution: {0}", RasterDefaults.YResolution);
   Console.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod);
}
<TestMethod> _
Public Sub RasterDefaultsExample()
   ShowValues()
   ' Create a raster image with current DPI
   Dim image1 As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, Nothing, 0)
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image1.XResolution, image1.YResolution)

   ' Change the resolution
   Dim xOldResolution As Integer = RasterDefaults.XResolution
   Dim yOldResolution As Integer = RasterDefaults.YResolution
   Dim xNewResolution As Integer = 196
   Dim yNewResolution As Integer = 196
   RasterDefaults.XResolution = xNewResolution
   RasterDefaults.YResolution = yNewResolution
   ShowValues()

   ' Create another raster image
   ' Create a raster image with current DPI
   Dim image2 As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, Nothing, 0)
   Console.WriteLine("Resolution of created image is {0} by {1} DPI", image2.XResolution, image2.YResolution)
   Debug.Assert(image2.XResolution = xNewResolution)
   Debug.Assert(image2.YResolution = yNewResolution)

   ' Reset old values
   RasterDefaults.XResolution = xOldResolution
   RasterDefaults.YResolution = yOldResolution

   image1.Dispose()
   image2.Dispose()
End Sub

Private Sub ShowValues()
   Console.WriteLine("Current defaults:")
   Console.WriteLine("XResolution: {0}", RasterDefaults.XResolution)
   Console.WriteLine("YResolution: {0}", RasterDefaults.YResolution)
   Console.WriteLine("DitheringMethod: {0}", RasterDefaults.DitheringMethod)
End Sub
Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also

Reference

RasterDefaults Members
Leadtools Namespace

 

 

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