AddMagicWandToRegion Method (original) (raw)
Summary
Sets a region based on the color found at point (x,y) in the image.
Syntax
C#
Objective-C
C++/CLI
Java
Python
- (BOOL)addMagicWandToRegion:(NSInteger)_left_
top:(NSInteger)_top_
lowerToleranceColor:(LTRasterColor *)lowTolColor
upperToleranceColor:(LTRasterColor *)upTolColor
combineMode:(LTRasterRegionCombineMode)_combineMode_
error:(NSError **)error
Parameters
left
X coordinate of a point. The color of the specified point will be used to set the region.
top
Y coordinate of a point. The color of the specified point will be used to set the region.
lowerToleranceColor
Lower tolerance values that set the lower stopping point for the region.
upperToleranceColor
Upper tolerance values that set the upper stopping point for the region.
combineMode
The action to take regarding the existing image region, if one is defined.
Example
This example will load an image, set a magic wand region to it, and fill the region with blue 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 AddMagicWandToRegionExample()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_AddMagicWandToRegion.bmp");
// Load the image
RasterImage image = codecs.Load(srcFileName);
// Posterize the image to decrease the number of colors
PosterizeCommand posterize = new PosterizeCommand(16);
posterize.Run(image);
// Specify a pixel in the upper left of the displayed image
LeadPoint pt = new LeadPoint(image.ImageWidth / 8, image.ImageHeight / 8);
// Adjust the point in case the view perspective is not TopLeft
pt = image.PointToImage(RasterViewPerspective.TopLeft, pt);
// Create a magic wand region at this point
RasterColor lowerColor = new RasterColor(20, 30, 150);
RasterColor upperColor = new RasterColor(15, 30, 10);
image.AddMagicWandToRegion(pt.X, pt.Y, lowerColor, upperColor, RasterRegionCombineMode.Set);
// Fill the region with blue
FillCommand fill = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Blue));
fill.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";
}
Leadtools Assembly