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:
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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);
}
}
}
}
package bdzhidao;
import java.awt.*;
import javax.swing.*;
public class Square extends JFrame{
public static void main(String[] args){
JFrame frame=new JFrame("可變正方形");
Spanel jp=new Spanel();
frame.add(jp);
frame.setSize(1366,768);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(true);
frame.setLocation(0,0);
frame.setVisible(true);
}
}
class Spanel extends JPanel{
int x=640;
int Width=8;
protected void paintComponent(Graphics g){
super.paintComponent(g);
g.setColor(new Color(10,200,40));
try{
Thread.sleep(1000);
}catch(InterruptedException e){
}
g.drawRect(x-=20,x-=20,Width+=10,Width+=10);
if(x=0){
System.exit(0);//當(dāng)正方形移到屏幕里面時(shí)關(guān)閉程序,如果沒有該語句則最后屏幕會(huì)變成綠色
}
repaint();
}
}
//縮小就只需要把相關(guān)數(shù)據(jù)更改一下就OK了,希望對(duì)你有幫助!
//其實(shí)就是利用線程不斷重新畫圖
為什么你不用PS呢,一次性解決了!你要是用JAVA代碼的話,必須要去虛席JAVA2D技術(shù)才可以!
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。
新聞標(biāo)題:java縮小代碼 java代碼怎么放大
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