怎么用java代碼放大或縮小圖片不失真。

放大圖像不會(huì)導(dǎo)致失真，而縮小圖像將不可避免的失真。Java中也同樣是這樣。但java提供了4個(gè)縮放的微調(diào)選項(xiàng)。image.SCALE_SMOOTH //平滑優(yōu)先image.SCALE_FAST//速度優(yōu)先image.SCALE_AREA_AVERAGING //區(qū)域均值image.SCALE_REPLICATE //像素復(fù)制型縮放image.SCALE_DEFAULT //默認(rèn)縮放模式調(diào)用方法Image new_img=old_img.getScaledInstance(1024, 768, Image.SCALE_SMOOTH);得到一張縮放后的新圖。怎么用java代碼放大或縮小圖片不失真。

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如何用Java實(shí)現(xiàn)圖形的放大和縮小

java實(shí)現(xiàn)圖形的放大和縮小，其實(shí)就是在畫圖時(shí)，改變圖片的長(zhǎng)和寬。以下代碼參考一下：

import?java.awt.Graphics;

import?java.awt.MouseInfo;

import?java.awt.Point;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?java.awt.event.MouseEvent;

import?java.awt.event.MouseListener;

import?java.io.File;

import?javax.swing.ImageIcon;

import?javax.swing.JButton;

import?javax.swing.JFileChooser;

import?javax.swing.JFrame;

import?javax.swing.JPanel;

import?javax.swing.filechooser.FileNameExtensionFilter;

public?class?App?extends?JFrame?implements?MouseListener,?ActionListener?{

int?x?=?0;

int?y?=?0;

File[]?selectedFiles?=?null;

int?fileIndex?=?0;

int?width?=?200;

int?height?=?200;

public?App()?{

setDefaultCloseOperation(EXIT_ON_CLOSE);

setLocationRelativeTo(null);

setSize(400,?300);

setResizable(false);

getContentPane().setLayout(null);

JPanel?panel?=?new?ImagePanel();

panel.setBounds(12,?40,?370,?218);

getContentPane().add(panel);

addMouseListener(this);

JButton?btnBrowse?=?new?JButton("Browse");

btnBrowse.addActionListener(this);

btnBrowse.setBounds(12,?9,?91,?21);

getContentPane().add(btnBrowse);

setVisible(true);

}

public?static?void?main(String[]?args)?{

new?App();

}

public?void?actionPerformed(ActionEvent?e)?{

JFileChooser?chooser?=?new?JFileChooser();

chooser.setMultiSelectionEnabled(true);

FileNameExtensionFilter?filter?=?new?FileNameExtensionFilter(

"JPG??GIF?Images",?"jpg",?"gif");

//?設(shè)置文件類型

chooser.setFileFilter(filter);

//?打開選擇器面板

int?returnVal?=?chooser.showOpenDialog(this);

if?(returnVal?==?JFileChooser.APPROVE_OPTION)?{

selectedFiles?=?chooser.getSelectedFiles();

repaint();

}

}

public?void?mouseClicked(MouseEvent?e)?{

}

public?void?mouseEntered(MouseEvent?e)?{

}

public?void?mouseExited(MouseEvent?e)?{

}

public?void?mousePressed(MouseEvent?e)?{

Point?point?=?MouseInfo.getPointerInfo().getLocation();

x?=?point.x;

y?=?point.y;

}

public?void?mouseReleased(MouseEvent?e)?{

Point?point?=?MouseInfo.getPointerInfo().getLocation();

int?thisX?=?point.x;

int?thisY?=?point.y;

System.out.println("thisX="?+?thisX?+?"??"?+?"thisY="?+?thisY);

if?((y?-?thisY??20??y?-?thisY??0)

||?(y?-?thisY??0??y?-?thisY??-20))?{

//?Y?在20范圍內(nèi)移動(dòng)認(rèn)為是水平移動(dòng)

if?(x??thisX)?{

//?right

if?(selectedFiles?!=?null

?fileIndex??selectedFiles.length?-?1)?{

fileIndex++;

}

}?else?{

//?left

if?(selectedFiles?!=?null??fileIndex??0)?{

fileIndex--;

}

}

}?else?{

if?(x??thisX)?{

//?右下

width?+=?20;

height?+=?20;

}?else?{

//?左上

width?-=?20;

height?-=?20;

}

}

repaint();

}

class?ImagePanel?extends?JPanel?{

public?void?paint(Graphics?g)?{

super.paint(g);

if?(selectedFiles?!=?null)?{

ImageIcon?icon?=?new?ImageIcon(selectedFiles[fileIndex]

.getPath());

g.drawImage(icon.getImage(),?0,?0,?width,?height,?this);

}

}

}

}

java 圖片縮放代碼

直接給你一個(gè)類，直接套用就好了

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import java.awt.geom.AffineTransform;

import java.awt.image.BufferedImage;

import java.awt.image.ColorModel;

import java.awt.image.WritableRaster;

import java.io.File;

import javax.imageio.ImageIO;

public class Resize {

BufferedImage bufImage;

int width;

int height;

public Resize() {

// TODO Auto-generated constructor stub

}

public Resize(String srcPath,int width,int height) {

this.width = width;

this.height = height;

try{

this.bufImage = ImageIO.read(new File(srcPath));

}catch(Exception e){

e.printStackTrace();

}

}

public static BufferedImage rize(BufferedImage srcBufImage,int width,int height){

BufferedImage bufTarget = null;

double sx = (double) width / srcBufImage.getWidth();

double sy = (double) height / srcBufImage.getHeight();

int type = srcBufImage.getType();

if(type == BufferedImage.TYPE_CUSTOM){

ColorModel cm = srcBufImage.getColorModel();

WritableRaster raster = cm.createCompatibleWritableRaster(width,

height);

boolean alphaPremultiplied = cm.isAlphaPremultiplied();

bufTarget = new BufferedImage(cm, raster, alphaPremultiplied, null);

}else

bufTarget = new BufferedImage(width, height, type);

Graphics2D g = bufTarget.createGraphics();

g.setRenderingHint(RenderingHints.KEY_RENDERING,

RenderingHints.VALUE_RENDER_QUALITY);

g.drawRenderedImage(srcBufImage, AffineTransform.getScaleInstance(sx, sy));

g.dispose();

return bufTarget;

}

}

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轉(zhuǎn)載源于：http://chinadenli.net/article20/hsigco.html

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