java intercepts picture instance code based on coordinates
- 2020-06-15 09:09:13
- OfStack
java intercepts the image according to the coordinates
Example code: the code is not a comment, very good to understand!
package com.json.test;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
public class OperateImage {
// === Source image path names such as :c:\1.jpg
private String srcpath ;
// === Clipping image store path name . Such as :c:\2.jpg
private String subpath ;
// === The shear point x coordinates
private int x ;
private int y ;
// === Shear point width
private int width ;
private int height ;
public OperateImage() {
}
public OperateImage( int x, int y, int width, int height) {
this .x = x ;
this .y = y ;
this .width = width ;
this .height = height ;
}
/**
* Crop the picture and save the new picture .
*/
public void cut()throws IOException {
FileInputStream is = null ;
ImageInputStream iis = null ;
try {
// Read image files
is =new FileInputStream(srcpath);
/*
* Returns contains all currently registered ImageReader the Iterator , these ImageReader
* Claims the ability to decode the specified format. Parameters: formatName - Contains informal format names .
* (e.g. "jpeg" or "tiff" ) etc. .
*/
Iterator < ImageReader > it=ImageIO.getImageReadersByFormatName("jpg");
ImageReader reader = it.next();
// Get picture stream
iis = ImageIO.createImageInputStream(is);
/*
* <p>iis: Read the source .true: Search forward only </p>. Mark it as 'Search only forward ' .
* This setting means that images contained in the input source will be read only sequentially and may be allowed reader
* Avoid caching input portions that contain data associated with previously read images.
*/
reader.setInput(iis, true ) ;
/*
* <p> Describes the class that how the stream is decoded <p>. Used to specify how to input from Java Image I/O
* Flow transformation in the context of the framework 1 Image or 1 The set of images. A plug-in for a specific image format
* From its ImageReader Implementation of the getDefaultReadParam Return from method
* ImageReadParam The instance.
*/
ImageReadParam param = reader.getDefaultReadParam();
/*
* Image clipping area. Rectangle Specifies in the coordinate space 1 Three zones, through Rectangle object
* The coordinates of the upper left vertex ( x . y ), width, and height can define this area.
*/
Rectangle rect = new Rectangle(x, y, width, height);
// provide 1 a BufferedImage , which is used as a target for decoding pixel data.
param.setSourceRegion(rect);
/*
* Use what is provided ImageReadParam Read through index imageIndex Specifies the object and will
* It is used as a 1 A complete BufferedImage To return.
*/
BufferedImage bi=reader.read(0,param);
// Save the new image
ImageIO.write(bi,"jpg",new File(subpath));
} finally {
if (is != null )
is.close() ;
if (iis != null )
iis.close();
}
}
public int getHeight() {
return height;
}
public void setHeight( int height) {
this .height = height;
}
public String getSrcpath() {
return srcpath;
}
public void setSrcpath(String srcpath) {
this .srcpath = srcpath;
}
public String getSubpath() {
return subpath;
}
public void setSubpath(String subpath) {
this .subpath = subpath;
}
public int getWidth() {
return width;
}
public void setWidth( int width) {
this .width = width;
}
public int getX() {
return x;
}
public void setX( int x) {
this .x = x;
}
public int getY() {
return y;
}
public void setY( int y) {
this .y = y;
}
public static void main(String[] args) {
OperateImage operateImage = new OperateImage(20, 20, 100, 100);
operateImage.srcpath = "C:/test/1.jpg";
operateImage.subpath = "C:/test/2.jpg";
try {
operateImage.cut();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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