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FrameRegion(RasterImage,Graphics,RasterRegionXForm,int) Method

Summary
Displays an outline of the image region in the given System.Drawing.Graphics object.
Syntax
C#
C++/CLI
Python
public static void FrameRegion( 
   RasterImage image, 
   Graphics graphics, 
   RasterRegionXForm xform, 
   int frameIndex 
) 
public: 
static void FrameRegion(  
   RasterImage^ image, 
   Graphics^ graphics, 
   RasterRegionXForm^ xform, 
   int frameIndex 
)  
def FrameRegion(self,image,graphics,xform,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+, Creating a Region and Working with the Existing Region.

Frame Add Function - Before

Frame Add Function - Before

Frame Add Function - After

Frame Add Function - After

View additional platform support for this Frame Add function.

Example
C#
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:\LEADTOOLS22\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 22.0.2023.3.31
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Leadtools.Drawing Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.