This is not a real training tool. The main purpose of this program is to demonstrate the use of
AlphaComposite class that implements the
Composite interface to display partly transparent images.
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146 | import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.ArrayList;
import javax.imageio.ImageIO;
public class MandarinTrainer extends JFrame{
private JPanel pmain=null;
private BufferedImage bufimage[]=null;
private int width=0;
private int height=0;
private ArrayList<Integer> px=null;
private ArrayList<Integer> py=null;
private int imgorder=0;
private boolean ori=true;
private float fcompo[];
private boolean areaclicked=false;
public MandarinTrainer(){
super("Mandarin Trainer");
setSize(450,450);
pmain=new DrawPanel();
pmain.setPreferredSize(new Dimension(450,450));
pmain.setBackground(Color.WHITE);
pmain.addMouseListener(new MouseHandler());
pmain.addMouseMotionListener(new MouseHandler());
add(pmain);
bufimage=new BufferedImage[4];
try{
bufimage[0]=ImageIO.read(new File("earth1.png"));
bufimage[1]=ImageIO.read(new File("earth2.png"));
bufimage[2]=ImageIO.read(new File("earth3.png"));
}catch(Exception ex){
}
px=new ArrayList<Integer>();
py=new ArrayList<Integer>();
fcompo=new float[bufimage.length];
for(int i=0;i<fcompo.length;i++){
fcompo[i]=0.1f;
}
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
show();
}
class DrawPanel extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
for(int i=0;i<bufimage.length;i++){
g2.setColor(new Color(0,0,0));
Composite c=AlphaComposite.getInstance(AlphaComposite.SRC_OVER,fcompo[i]);
g2.setComposite(c);
g2.drawImage(bufimage[i],0,0,null);
}
}
}
void getPixel(int imageordertemp){
width=bufimage[imgorder].getWidth();
height=bufimage[imgorder].getHeight();
px.clear();
py.clear();
for(int i=0;i<height;i++){
for(int j=0;j<width;j++){
int currentpixel=bufimage[imgorder].getRGB(j,i);
if(currentpixel!=-1){
px.add(j);
py.add(i);
}
}
}
}
class MouseHandler implements MouseMotionListener, MouseListener{
public void mouseMoved(MouseEvent e){
}
public void mouseEntered(MouseEvent e){
}
public void mouseExited(MouseEvent e){
}
public void mousePressed(MouseEvent e){
if(imgorder>=3){
return;
}
getPixel(imgorder);
for(int i=0;i<px.size();i++){
if(e.getX()==px.get(i)&&e.getY()==py.get(i)){
areaclicked=true;
break;
}
}
}
public void mouseDragged(MouseEvent e){
if(imgorder>=3||areaclicked==false){
return;
}
for(int i=0;i<px.size();i++){
if(e.getX()==px.get(i)&&e.getY()==py.get(i)){
areaclicked=true;
}
}
}
public void mouseReleased(MouseEvent e){
if(imgorder>=3||areaclicked==false){
return;
}
areaclicked=false;
for(int i=0;i<px.size();i++){
if(e.getX()==px.get(i)&&e.getY()==py.get(i)){
areaclicked=true;
break;
}
}
if(areaclicked==true){
fcompo[imgorder]=0.5f;
imgorder++;
areaclicked=false;
repaint();
}
}
public void mouseClicked(MouseEvent e){
}
}
public static void main(String[] args){
new MandarinTrainer();
}
}
|
