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ViewPerspective Property

Summary
The view perspective of the external representation.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public RasterViewPerspective ViewPerspective { get; set; } 
@property (nonatomic, assign) LTRasterViewPerspective viewPerspective 
public int getViewPerspective(); 
public: 
property RasterViewPerspective ViewPerspective { 
   RasterViewPerspective get(); 
   void set (    RasterViewPerspective ); 
} 
ViewPerspective # get and set (RasterRegionXForm) 

Property Value

The view perspective of the external representation.

Remarks

With LEADTOOLS painting methods, the view perspective is always RasterViewPerspective.TopLeft.

For more information, refer to Translating Coordinates for a Region.

Example
C#
Java
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
 
 
public void RasterRegionTransformExample() 
{ 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_TransformRegion.bmp"); 
   using (RasterCodecs codecs = new RasterCodecs()) 
   { 
      // Load the source image 
      using (RasterImage image = codecs.Load(srcFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)) 
      { 
         // Add a large elliptical region  
         image.AddEllipseToRegion(null, new LeadRect(0, 0, image.ImageWidth, image.ImageHeight), RasterRegionCombineMode.Set); 
 
         // Fill the image with yellow 
         FillCommand cmd = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Yellow)); 
         cmd.Run(image); 
 
         // Get the region 
         using (RasterRegion region = image.GetRegion(null)) 
         { 
            // Transform this region by making it twice as small 
            LeadRect bounds = region.GetBounds(); 
 
            RasterRegionXForm xform = RasterRegionXForm.Default; 
 
            xform.XScalarNumerator = 1; 
            xform.XScalarDenominator = 2; 
            xform.YScalarNumerator = 1; 
            xform.YScalarDenominator = 2; 
 
            xform.XOffset = bounds.Width / 2; 
            xform.YOffset = bounds.Height / 2; 
 
            region.Transform(xform); 
 
            // Re-set this region into the image 
            image.SetRegion(null, region, RasterRegionCombineMode.Set); 
         } 
 
         // Now fill with red and save 
         cmd = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Red)); 
         cmd.Run(image); 
 
         codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
      } 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
} 
 
import static org.junit.Assert.assertTrue; 
 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.nio.file.Files; 
import java.nio.file.Paths; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.FillCommand; 
 
 
public void rasterRegionTransformExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "Image1.cmp"); 
   String destFileName = combine(LEAD_VARS_IMAGES_DIR, "Image1_TransformRegion.bmp"); 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Load the source image 
   RasterImage image = codecs.load(srcFileName, 0, CodecsLoadByteOrder.BGR_OR_GRAY, 1, 1); 
 
   // Add a large elliptical region 
   image.addEllipseToRegion(null, new LeadRect(0, 0, image.getImageWidth(), image.getImageHeight()), 
         RasterRegionCombineMode.SET); 
 
   // Fill the image with yellow 
   FillCommand cmd = new FillCommand(RasterColor.fromKnownColor(RasterKnownColor.YELLOW)); 
   cmd.run(image); 
 
   // Get the region 
   RasterRegion region = image.getRegion(null); 
 
   // Transform this region by making it twice as small 
   LeadRect bounds = region.getBounds(); 
   RasterRegionXForm xform = RasterRegionXForm.Default(); 
   xform.setXScalarNumerator(1); 
   xform.setXScalarDenominator(2); 
   xform.setYScalarNumerator(1); 
   xform.setYScalarDenominator(2); 
   xform.setXOffset(bounds.getWidth() / 2); 
   xform.setYOffset(bounds.getHeight() / 2); 
   region.transform(xform); 
 
   // Re-set this region into the image 
   image.setRegion(null, region, RasterRegionCombineMode.SET); 
 
   // Now fill with red and save 
   cmd = new FillCommand(RasterColor.fromKnownColor(RasterKnownColor.RED)); 
   cmd.run(image); 
 
   codecs.save(image, destFileName, RasterImageFormat.BMP, 24); 
 
   assertTrue("Image unsuccessfully saved", (new File(destFileName)).exists()); 
   System.out.println("Command run and image saved to " + destFileName); 
} 
Requirements

Target Platforms

Help Version 23.0.2024.5.22
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.