FrameRegion(RasterImage,Graphics,RasterRegionXForm,int) Method

Summary

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

Syntax

C++

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

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

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

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:\LEADTOOLS21\Resources\Images"; 
}

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:\LEADTOOLS21\Resources\Images" 
End Class

Requirements

Target Platforms

Reference

RasterImagePainter Class

RasterImagePainter Members

Overload List

Download our FREE evaluation

Help Version 21.0.2021.7.2

Leadtools.Drawing Assembly

Introduction

Getting Started

Namespaces

Leadtools.Drawing Namespace

Assemblies