Creates or updates the image region by adding a polygonal region.
public void AddPolygonToRegion(
RasterRegionXForm xform,
LeadPoint[] pts,
LeadFillMode fillMode,
RasterRegionCombineMode combineMode
)
Public Overloads Sub AddPolygonToRegion( _
ByVal xform As RasterRegionXForm, _
ByVal pts() As LeadPoint, _
ByVal fillMode As LeadFillMode, _
ByVal combineMode As RasterRegionCombineMode _
)
- (BOOL)addPolygonToRegion:(nullable LTRasterRegionXForm *)xform
points:(LeadPoint *)points
length:(NSInteger)length
fillMode:(LTLeadFillMode)fillMode
combineMode:(LTRasterRegionCombineMode)combineMode
error:(NSError **)error
public void addPolygonToRegion(
RasterRegionXForm xform,
LeadPoint[] pts,
Path.FillType fillType,
RasterRegionCombineMode combineMode
)
public:
void AddPolygonToRegion(
RasterRegionXForm^ xform,
array<LeadPoint>^ pts,
LeadFillMode fillMode,
RasterRegionCombineMode combineMode
)
xform
RasterRegionXForm object that LEADTOOLS uses to translate between display coordinates and image coordinates. If you specify null in this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the image view perspective.
pts
Array of LeadPoint objects. The points in the array must be in the order in which the vertices of the polygon are connected. To create the line that closes the polygon, the last point in the array is connected to the first point of the array.
fillMode
Indicates how to handle complex crossing lines.
Value | Meaning |
---|---|
LeadFillMode.Winding | All pixels that are inside the resulting exterior lines are in the region. |
LeadFillMode.Alternate | The region includes the area between odd-numbered and even-numbered polygon sides on each scan line. |
combineMode
The action to take regarding the existing image region, if one is defined.
To update an existing region, you specify how the new region is to be combined with the existing one using the combineMode parameter. For more information, refer to RasterRegionCombineMode.
For more information, refer to Creating a Region.
For more information, refer to Saving A Region.
For more information, refer to Working with the Existing Region.
This example will load an image, add a polygon region to it, and run the InvertCommand to show the affected area before saving the image back to disk.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using LeadtoolsExamples.Common;
using Leadtools.Svg;
public void AddPolygonToRegionExample()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
string destFileName = Path.Combine(ImagesPath.Path, "Image1_AddPolygonToRegion.bmp");
// Load the image
RasterImage image = codecs.Load(srcFileName);
// Add a polygon region
RasterRegionXForm xform = new RasterRegionXForm();
xform.ViewPerspective = RasterViewPerspective.TopLeft;
xform.XOffset = 0;
xform.YOffset = 0;
xform.XScalarDenominator = 1;
xform.XScalarNumerator = 1;
xform.YScalarDenominator = 1;
xform.YScalarNumerator = 1;
int x1 = image.ImageWidth / 4;
int y1 = image.ImageHeight / 4;
int x2 = image.ImageWidth / 3;
int y2 = image.ImageHeight / 3;
LeadPoint[] pts =
{
new LeadPoint(x1, y1),
new LeadPoint(x2, y1),
new LeadPoint(x1, y2),
new LeadPoint(x2, y2)
};
image.AddPolygonToRegion(xform, pts, LeadFillMode.Winding, RasterRegionCombineMode.Set);
// Draw something on the image
InvertCommand command = new InvertCommand();
command.Run(image);
// Save the image
codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);
image.Dispose();
codecs.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg
Public Sub AddPolygonToRegionExample()
Dim codecs As RasterCodecs = New RasterCodecs()
Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_AddPolygonToRegion.bmp")
' Load the image
Dim image As RasterImage = codecs.Load(srcFileName)
' Add a polygon region
Dim xform As RasterRegionXForm = New RasterRegionXForm()
xform.ViewPerspective = RasterViewPerspective.TopLeft
xform.XOffset = 0
xform.YOffset = 0
xform.XScalarDenominator = 1
xform.XScalarNumerator = 1
xform.YScalarDenominator = 1
xform.YScalarNumerator = 1
Dim x1 As Integer = image.ImageWidth \ 4
Dim y1 As Integer = image.ImageHeight \ 4
Dim x2 As Integer = image.ImageWidth \ 3
Dim y2 As Integer = image.ImageHeight \ 3
Dim pts As LeadPoint() = {New LeadPoint(x1, y1), New LeadPoint(x2, y1), New LeadPoint(x1, y2), New LeadPoint(x2, y2)}
image.AddPolygonToRegion(xform, pts, LeadFillMode.Winding, RasterRegionCombineMode.Set)
' Draw something on the image
Dim command As InvertCommand = New InvertCommand()
command.Run(image)
' Save the image
codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24)
image.Dispose()
codecs.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
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