Select java graph and drag them
I have a class of the House where I built a House of java graphic design (rectangle and lines). I have a SelectAndDragTest class, which is the main class. When I run this class, it will generate a House on the JPanel. It is movable. But when I click on the button to add another House, I can't drag the House newly added, but not previous homes. How that other House is selectable on mouse down and movable? I would be grateful if anyone could give suggestions. Here are my codes:
SelectAndDragTest.java
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class SelectAndDragTest extends JPanel {
private static final String TITLE = "House";
private static final int W = 640;
private static final int H = 480;
public static Random random = new Random();
public static Point objPt = new Point(W / 2, H / 2);
private Point mousePt;
House house;
public static JButton btnAdd;
public SelectAndDragTest() {
this.setFont(new Font("Sans Serif", Font.BOLD, 12));
this.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
mousePt = e.getPoint();
repaint();
}
});
this.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseDragged(MouseEvent e) {
int dx = e.getX() - mousePt.x;
int dy = e.getY() - mousePt.y;
objPt.setLocation(objPt.x + dx, objPt.y + dy);
mousePt = e.getPoint();
repaint();
}
});
btnAdd = new JButton("Add new house");
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
house = new House(objPt.x, objPt.y);
addHouse(house);
}
});
this.add(btnAdd);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(W, H);
}
List<House> houses = new ArrayList<House>();
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
for (House h:houses) {
h.paint(g);
}
House onehouse = new House(objPt.x, objPt.y);
onehouse.paint(g);
}
public void addHouse(House house) {
houses.add(house);
repaint();
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame(TITLE);
f.add(new SelectAndDragTest());
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
});
}
}
House.Java
import java.awt.Graphics;
public class House {
int x,y;
public House(int x, int y) {
this.x = x;
this.y = y;
}
public void paint (Graphics page) {
page.drawRect(x, y, 40, 40);
page.drawLine(x, y, x+20, y-20);
page.drawLine(x+40, y, x+20, y-20);
}
}
OK, here's your project with minimal changes, I could do so he can do what you originally described - choose any home on the screen and move.
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class SelectAndDragTest_lm extends JPanel {
private static final String TITLE = "House";
private static final int W = 640;
private static final int H = 480;
public static Random random = new Random();
public static Point objPt = new Point(W / 2, H / 2);
private Point mousePt;
House house;
public static JButton btnAdd;
public SelectAndDragTest_lm() {
this.setFont(new Font("Sans Serif", Font.BOLD, 12));
this.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
mousePt = e.getPoint();
for (House h:houses) {
h.select(mousePt.x, mousePt.y); //check to see if selected--Houe will know
}
}
public void mouseReleased(MouseEvent e) {
for (House h:houses) h.unselect(); //button up--nobody should move any more
}
});
this.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseDragged(MouseEvent e) {
mousePt = e.getPoint();
for (House h:houses) h.move(mousePt.x, mousePt.y); //tell Houses to move--they will know if they should
repaint();
}
});
btnAdd = new JButton("Add new house");
btnAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
house = new House(objPt.x, objPt.y);
addHouse(house);
}
});
this.add(btnAdd);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(W, H);
}
List houses = new ArrayList();
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
for (House h:houses) {
h.paint(g);
}
//House onehouse = new House(objPt.x, objPt.y);
//onehouse.paint(g);
}
public void addHouse(House house) {
houses.add(house);
repaint();
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame(TITLE);
f.add(new SelectAndDragTest_lm());
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
});
}
}
//-----------------------House
import java.awt.Graphics;
import java.awt.Polygon;
public class House extends Polygon{
int x,y;
int tx, ty;
boolean isSelected = false;
public House(int x, int y) {
this.x = x;
this.y = y;
this.addPoint(x, y);
this.addPoint(x, y - 20);
this.addPoint(x - 10, y - 30);
this.addPoint(x - 20, y - 20);
this.addPoint(x - 20, y);
isSelected = true;
move(x, y);
isSelected = false;
}
public void select(int x, int y){
if(this.contains(x, y)) isSelected=true;
}
public void unselect(){
isSelected = false;
}
public void move(int x, int y) {
if(isSelected) {
tx = x;
ty= y;
translate(tx-this.x, ty-this.y);
this.x = tx;
this.y = ty;
}
}
public void paint(Graphics g) {
g.drawPolygon(this);
g.fillPolygon(this); //uncomment this line to fill the house
}
}
Tags: Java
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