- (BOOL)isVisible:(LeadPoint)point
public boolean isVisible(LeadPoint point)
point
The LeadPoint structure to test.
true when point is contained within this RasterRegion; false, otherwise.
This example will create a small elliptical region in an image, gets the RasterRegion object before resetting the image region. It will then switch the red and blue component of every pixel inside the region data.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using LeadtoolsExamples.Common;
public void RasterRegionIsVisibleExample()
{
string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
string destFileName = Path.Combine(ImagesPath.Path, "Image1_IsVisibleRegion.bmp");
using (RasterCodecs codecs = new RasterCodecs())
{
// Load the source image
using (RasterImage image = codecs.Load(srcFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1))
{
// Add a small elliptical region
image.AddEllipseToRegion(null, new LeadRect(image.ImageWidth / 3, image.ImageHeight / 3, image.ImageWidth / 3, image.ImageHeight / 3), RasterRegionCombineMode.Set);
// Get the region
using (RasterRegion region = image.GetRegion(null))
{
// Remove the region from the image
image.MakeRegionEmpty();
// Loop the image pixels, if it is inside the region, switch
// the red and blue component of the pixel color
for (int y = 0; y < image.Height; y++)
{
for (int x = 0; x < image.Width; x++)
{
// Check if this pixel is inside the region
if (region.IsVisible(new LeadPoint(x, y)))
{
// Yes, flip its R and B component
RasterColor color = image.GetPixelColor(y, x);
color = new RasterColor(color.B, color.G, color.R);
image.SetPixelColor(y, x, color);
}
}
}
}
codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);
}
}
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Public Sub RasterRegionIsVisibleExample()
Dim codecs As New RasterCodecs()
Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_IsVisibleRegion.bmp")
' Load the source image
Using image As RasterImage = codecs.Load(srcFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)
' Add a small elliptical region
image.AddEllipseToRegion(Nothing, New LeadRect(image.ImageWidth \ 3, image.ImageHeight \ 3, image.ImageWidth \ 3, image.ImageHeight \ 3), RasterRegionCombineMode.Set)
' Get the region
Using region As RasterRegion = image.GetRegion(Nothing)
' Remove the region from the image
image.MakeRegionEmpty()
' Loop the image pixels, if it is inside the region, switch
' the red and blue component of the pixel color
For y As Integer = 0 To image.Height - 1
For x As Integer = 0 To image.Width - 1
' Check if this pixel is inside the region
If (region.IsVisible(New LeadPoint(x, y))) Then
' Yes, flip its R and B component
Dim color As RasterColor = image.GetPixelColor(y, x)
color = New RasterColor(color.B, color.G, color.R)
image.SetPixelColor(y, x, color)
End If
Next
Next
End Using
codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24)
End Using
codecs.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
Help Collections
Raster .NET | C API | C++ Class Library | HTML5 JavaScript
Document .NET | C API | C++ Class Library | HTML5 JavaScript
Medical .NET | C API | C++ Class Library | HTML5 JavaScript
Medical Web Viewer .NET
Multimedia
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms
Supported Platforms
.NET, Java, Android, and iOS/macOS Assemblies
Imaging, Medical, and Document
C API/C++ Class Libraries
Imaging, Medical, and Document
HTML5 JavaScript Libraries
Imaging, Medical, and Document