FrameRegion(RasterImage,Graphics,RasterRegionXForm,Int32) Method

Displays an outline of the image region in the given System.Drawing.Graphics object.

Syntax

Visual Basic
C#
Objective-C
Java
C++

public static void FrameRegion( 
   RasterImage image,
   Graphics graphics,
   RasterRegionXForm xform,
   int frameIndex
)

'Declaration
 
Public Overloads Shared Sub FrameRegion( _
   ByVal image As RasterImage, _
   ByVal graphics As Graphics, _
   ByVal xform As RasterRegionXForm, _
   ByVal frameIndex As Integer _
)

'Usage
 
Dim image As RasterImage
Dim graphics As Graphics
Dim xform As RasterRegionXForm
Dim frameIndex As Integer
 
RasterImagePainter.FrameRegion(image, graphics, xform, frameIndex)

public:
static void FrameRegion( 
   RasterImage^ image,
   Graphics^ graphics,
   RasterRegionXForm^ xform,
   int frameIndex
)

Parameters

image: The source image.
graphics: System.Drawing.Graphics object where the image is displayed and where the frame is to appear.
xform: Leadtools.RasterRegionXForm object that LEADTOOLS uses to translate between display coordinates and image coordinates.
frameIndex: Zero-index of the frame to display. Possible values are from 0 to MaxRegionFrameIndex. You can animate the region frame by cycling between these values.

Remarks

If the region includes non-contiguous shapes, each shape is outlined. The outline, itself, is inside the region.

Before calling this method, create a Leadtools.RasterRegionXForm object and set its values, which LEADTOOLS uses to translate between device context coordinates and image coordinates.

This method is designed to produce an animated frame, which you can implement by calling the method with a timer event that cycles through the possible frame types.

For more information refer to RasterImage and GDI/GDI+.

For more information, refer to Creating a Region and Working with the Existing Region.

Example

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Drawing
Imports Leadtools.ImageProcessing

Public Sub FrameRegionExample()
   Dim f As New FrameRegionForm()
   f.ShowDialog()
End Sub

Class FrameRegionForm
   Inherits Form
   Private frameIndex As Integer
   Private image As RasterImage
   Private timer As System.Windows.Forms.Timer
   Private fillRegion As Boolean

   Public Sub New()
      ' Load the image
      Using codecs As New RasterCodecs()
         Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
         image = codecs.Load(srcFileName)
      End Using

      ' Add a region to the image
      Dim rc As New LeadRect(image.Width \ 3, image.Height \ 3, image.Width \ 3, image.Height \ 3)
      Dim xform As New RasterRegionXForm()
      xform.ViewPerspective = RasterViewPerspective.TopLeft
      image.AddEllipseToRegion(xform, rc, RasterRegionCombineMode.Set)

      ' initialize the frame index
      frameIndex = 0

      fillRegion = True

      Text = "Double click to enable/disable filling the region"

      ' Create the timer
      timer = New System.Windows.Forms.Timer()
      timer.Interval = 100
      AddHandler timer.Tick, AddressOf timer_Tick
      timer.Start()
   End Sub

   Protected Overrides Sub Dispose(ByVal disposing As Boolean)
      ' Clean up
      If disposing Then
         If Not IsNothing(timer) Then
            timer.Dispose()
         End If

         If Not IsNothing(image) Then
            image.Dispose()
         End If

      End If

      MyBase.Dispose(disposing)
   End Sub

   Protected Overrides Sub OnDoubleClick(ByVal e As EventArgs)
      fillRegion = Not fillRegion
      Invalidate()

      MyBase.OnDoubleClick(e)
   End Sub

   Private Function GetXForm(ByVal destRect As LeadRect) As RasterRegionXForm
      ' Calculate xform when the image is painted into 'destRect'
      Dim xform As New RasterRegionXForm()
      xform.ViewPerspective = RasterViewPerspective.TopLeft
      xform.XOffset = destRect.Left
      xform.YOffset = destRect.Top
      xform.XScalarDenominator = image.Width
      xform.XScalarNumerator = destRect.Width
      xform.YScalarDenominator = image.Height
      xform.YScalarNumerator = destRect.Height

      Return xform
   End Function

   Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
      ' Draw the image fit and center on this form
      Dim destRect As LeadRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom)
      destRect = RasterImage.CalculatePaintModeRectangle( _
          image.ImageWidth, _
          image.ImageHeight, _
          destRect, _
          RasterPaintSizeMode.Fit, _
          RasterPaintAlignMode.Center, _
          RasterPaintAlignMode.Center)

      Dim clipRect As LeadRect = LeadRect.FromLTRB(e.ClipRectangle.Left, e.ClipRectangle.Top, e.ClipRectangle.Right, e.ClipRectangle.Bottom)
      RasterImagePainter.Paint(image, e.Graphics, LeadRect.Empty, LeadRect.Empty, destRect, clipRect, RasterPaintProperties.Default)

      If fillRegion Then
         Dim xform As RasterRegionXForm = GetXForm(destRect)
         RasterImagePainter.FillRegion(image, e.Graphics, xform, New RasterColor(255, 0, 255))
      End If

      MyBase.OnPaint(e)
   End Sub

   Private Sub timer_Tick(ByVal sender As Object, ByVal e As EventArgs)
      ' Frame the image region
      Dim destRect As LeadRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom)

      destRect = RasterImage.CalculatePaintModeRectangle( _
         image.ImageWidth, _
         image.ImageHeight, _
         destRect, _
         RasterPaintSizeMode.Fit, _
         RasterPaintAlignMode.Center, _
         RasterPaintAlignMode.Center)

      Dim xform As RasterRegionXForm = GetXForm(destRect)

      Using g As Graphics = CreateGraphics()
         RasterImagePainter.FrameRegion(image, g, xform, frameIndex)
      End Using

      ' advance to next frame
      frameIndex = frameIndex + 1
      If frameIndex > RasterImagePainter.MaxRegionFrameIndex Then
         frameIndex = 0
      End If
   End Sub
End Class

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;

public void FrameRegionExample()
{
   FrameRegionForm f = new FrameRegionForm();
   f.ShowDialog();
}

class FrameRegionForm : Form
{
   private int frameIndex;
   private RasterImage image;
   private System.Windows.Forms.Timer timer;
   private bool fillRegion;

   public FrameRegionForm()
   {
      // Load the image
      using(RasterCodecs codecs = new RasterCodecs())
      {
         string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
         image = codecs.Load(srcFileName);
      }

      // Add a region to the image
      LeadRect rc = new LeadRect(image.Width / 3, image.Height / 3, image.Width / 3, image.Height / 3);
      RasterRegionXForm xform = new RasterRegionXForm();
      xform.ViewPerspective = RasterViewPerspective.TopLeft;
      image.AddEllipseToRegion(xform, rc, RasterRegionCombineMode.Set);

      // initialize the frame index
      frameIndex = 0;

      fillRegion = true;

      Text = "Double click to enable/disable filling the region";

      // Create the timer
      timer = new System.Windows.Forms.Timer();
      timer.Interval = 100;
      timer.Tick += new EventHandler(timer_Tick);
      timer.Start();
   }

   protected override void Dispose(bool disposing)
   {
      // Clean up
      if(disposing)
      {
         if(timer != null)
         {
            timer.Dispose();
         }

         if(image != null)
         {
            image.Dispose();
         }

      }

      base.Dispose(disposing);
   }

   protected override void OnDoubleClick(EventArgs e)
   {
      fillRegion = !fillRegion;
      Invalidate();

      base.OnDoubleClick(e);
   }

   private RasterRegionXForm GetXForm(LeadRect destRect)
   {
      // Calculate xform when the image is painted into 'destRect'
      RasterRegionXForm xform = new RasterRegionXForm();
      xform.ViewPerspective = RasterViewPerspective.TopLeft;
      xform.XOffset = destRect.Left;
      xform.YOffset = destRect.Top;
      xform.XScalarDenominator = image.Width;
      xform.XScalarNumerator = destRect.Width;
      xform.YScalarDenominator = image.Height;
      xform.YScalarNumerator = destRect.Height;

      return xform;
   }

   protected override void OnPaint(PaintEventArgs e)
   {
      // Draw the image fit and center on this form
      LeadRect destRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom);
      destRect = RasterImage.CalculatePaintModeRectangle(
          image.ImageWidth,
          image.ImageHeight,
          destRect,
          RasterPaintSizeMode.Fit,
          RasterPaintAlignMode.Center,
          RasterPaintAlignMode.Center);

      LeadRect clipRect = LeadRect.FromLTRB(e.ClipRectangle.Left, e.ClipRectangle.Top, e.ClipRectangle.Right, e.ClipRectangle.Bottom);
      RasterImagePainter.Paint(image, e.Graphics, LeadRect.Empty, LeadRect.Empty, destRect, clipRect, RasterPaintProperties.Default);

      if(fillRegion)
      {
         RasterRegionXForm xform = GetXForm(destRect);
         RasterImagePainter.FillRegion(image, e.Graphics, xform, new RasterColor(255, 0, 255));
      }

      base.OnPaint(e);
   }

   private void timer_Tick(object sender, EventArgs e)
   {
      // Frame the image region
      LeadRect destRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom);

      destRect = RasterImage.CalculatePaintModeRectangle(
         image.ImageWidth,
         image.ImageHeight,
         destRect,
         RasterPaintSizeMode.Fit,
         RasterPaintAlignMode.Center,
         RasterPaintAlignMode.Center);

      RasterRegionXForm xform = GetXForm(destRect);

      using(Graphics g = CreateGraphics())
      {
         RasterImagePainter.FrameRegion(image, g, xform, frameIndex);
      }

      // advance to next frame
      frameIndex++;
      if(frameIndex > RasterImagePainter.MaxRegionFrameIndex)
      {
         frameIndex = 0;
      }
   }
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Requirements

Target Platforms

Reference

RasterImagePainter Class
RasterImagePainter Members
Overload List