Java--bufferedimage Operation Example

Change image ColorModel Object index by mouse position to realize automatic image pixel change

BufferedImageThe composition of the image data ColorModel Raster . Rasterthe SampleModel number and type of band must match the ColorModel required quantity and type to represent its color and alpha component. The BufferedImage upper-left corner coordinates for all objects are (0, 0). Therefore, anything used to construct BufferedImage Raster must satisfy: minx=0 and miny=0.

This class relies on Raster data acquisition methods, data-set methods, and ColorModel color-characterization methods.

Package chapter2;

Import javax.swing.*;
Import java.awt.*;
Import java.awt.event.MouseEvent;
Import Java.awt.event.MouseMotionListener;
Import java.awt.image.*;

/**
* Created by LENOVO on 18-1-27.
*/
public class Bufferedimagedemo extends JPanel implements mousemotionlistener{
Private BufferedImage image = null;
private int width = 350;
private int height = 350;
Public Bufferedimagedemo () {
Image = CreateImage ();
Addmousemotionlistener (this);
}

@Override
public void mousedragged (MouseEvent e) {

}

@Override
public void mousemoved (MouseEvent e) {
//Create new picture
image = New BufferedImage (Createcolormodel (e.ge TX ()), Image.getraster (), false,null);
Repaint ();
}
public void Paintcomponent (Graphics g) {
Graphics2D g2d = (graphics2d) g.create ();
if (image = null) {
G2d.drawimage (image,2,2,width,height,null);
}
}
//color feature get
private static ColorModel Createcolormodel (int n) {
byte[] r = new BYTE[16];
Byte[] G = new BYTE[16];
Byte[] b = new BYTE[16];
for (int i=0;i<r.length;i++) {
R[i] = (byte) n;
G[i] = (byte) n;
B[i] = (byte) n;
}
return new IndexColorModel (4,16,R,G,B);
}

Private BufferedImage CreateImage () {
byte[] pixels = new Byte[width*height];
/*
* public databufferbyte (by Te[] DataArray, int size, int offset)
Constructs a byte-based databuffer with a single storage unit using the specified array, size, and offset. DataArray
must have an offset + size element at least. The accessor for this databuffer can only use offset to offset + size-1 elements.
* */
DataBuffer databuffer = new DataBufferByte (pixels,width*height,0);
//samplemodel is abstract class, Compressed Sample data: Singlepixelpackedsamplemodel Implementation class
//package multiple samples into an element
/*
* public Singlepixelpackedsamplemodel (int Datatype,int W, int h,int[] bitmasks)
* DataType-stores the data type used by the sample.
W-the width, in pixels, of the image data region described.
H-the height, in pixels, of the image data region described.
Bitmasks-Bitmask of all band.
* */
SampleModel SampleModel = new Singlepixelpackedsamplemodel (databuffer.type_byte,width,height,new int[]{( byte) 0xf});
//null represents the position (0,0)
WritableRaster raster = Raster.createwritableraster (samplemodel,databuffer,null);
return new BufferedImage (Createcolormodel (0), raster,false,null);
}

public static void Main (String args[]) {
JFrame JF = new JFrame ("BufferedImage Demo");
Jf.setdefaultcloseoperation (Jframe.exit_on_close);
Jf.getcontentpane (). setlayout (New BorderLayout ());
Jf.getcontentpane (). Add (New Bufferedimagedemo (), borderlayout.center);
Jf.setpreferredsize (New Dimension (380,380));
Jf.pack ();
Jf.setvisible (TRUE);
}
}

Java--bufferedimage Operation Example