AddPolygonToRegion(RasterRegionXForm,LeadPoint[],LeadFillMode,RasterRegionCombineMode) Method

Summary

Creates or updates the image region by adding a polygonal region.

Syntax

Objective-C

C++/CLI

Java

Python

public void AddPolygonToRegion( 
   RasterRegionXForm xform, 
   LeadPoint[] pts, 
   LeadFillMode fillMode, 
   RasterRegionCombineMode combineMode 
)

- (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 
)

def AddPolygonToRegion(self,xform,] pts,fillMode,combineMode):

Parameters

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.

Remarks

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.

Example

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 Leadtools.Svg; 
 
 
public void AddPolygonToRegionExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "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(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

Overload List

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Help Version 22.0.2023.5.16

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies