hey need help to in jframe
Hi,
I need to be able to drag a circle in jframe
I try to do something but I don't know hy it does not work
cAn anybody help me plz
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
publicclass circleextends JFrame
{
publicstaticint size= 400;
publicstaticint r=50;
privateint x;
privateint y;
privateint cX;
privateint cY;
privateint dX;
privateint dY;
privateint a;
privateint b;
private MouseHandler mh;
privateboolean click =false;
public circle()
{
super("Drag circle");
cX=r/4;
cY=r/4;
mh=new MouseHandler();
addMouseListener(mh);
setSize(size,size);
setVisible(true);
}
publicvoid paint(Graphics g)
{
g.setColor(Color.RED);
g.fillOval(cX,cY,r*2,r*2);
}
privateclass MouseHandlerextends MouseAdapter
{
publicvoid MousePressed(MouseEvent me)
{
a=me.getX();
b=me.getY();
if (Math.sqrt((cX - a)*(cX - a) + (cY - b)*(cY - b)) < r)
dX=me.getX()-x;
dY=me.getY()-y;
}
publicvoid MouseDragged(MouseEvent me)
{
x = me.getX() - dX;
y=me.getY()-dY;
cX= x+r;
cY=y+r;
repaint();
}
}
publicstaticvoid main (String [] args)
{
circle c1 =new circle();
c1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
[3592 byte] By [
beegee123a] at [2007-10-2 14:26:23]
The code is rearranged a bit, and there is still a logic error in the circle positioning.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class circle extends JPanel
{
int size= 400;
int r=50;
int x;
int y;
int cX;
int cY;
int dX;
int dY;
int a;
int b;
private boolean click = false;
public circle()
{
cX=r/4;
cY=r/4;
addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseHandler());
setPreferredSize(new Dimension(size,size));
setVisible(true);
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.setColor(Color.RED);
g.fillOval(cX,cY,r*2,r*2);
}
private class MouseHandler implements MouseListener,MouseMotionListener
{
public void mousePressed(MouseEvent me)
{
a=me.getX();
b=me.getY();
if (Math.sqrt((cX - a)*(cX - a) + (cY - b)*(cY - b)) < r)
{
dX=me.getX()-x;
dY=me.getY()-y;
}
}
public void mouseDragged(MouseEvent me)
{
x = me.getX() - dX;
y=me.getY()-dY;
cX= x+r;
cY=y+r;
repaint();
}
public void mouseMoved(MouseEvent me){}
public void mouseReleased(MouseEvent me){}
public void mouseClicked(MouseEvent me){}
public void mouseEntered(MouseEvent me){}
public void mouseExited(MouseEvent me){}
}
}
public class beegee
{
public static void main (String [] args)
{
JFrame frame = new JFrame("Drag circle");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new circle());
frame.pack();
frame.setVisible(true);
}
}
mouseDargged is not a member of MouseAdapter - you need a motion listener for this. Try the code I added here (I renamed circle to Circle according to java conventions)
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Circle extends JFrame {
public static int size = 400;
public static int r = 50;
private int x;
private int y;
private int cX;
private int cY;
private int dX;
private int dY;
private int a;
private int b;
private MouseHandler mh;
private boolean click = false;
public Circle() {
super("Drag circle");
cX = r / 4;
cY = r / 4;
mh = new MouseHandler();
addMouseListener(mh);
addMouseMotionListener(mh);
setSize(size, size);
setVisible(true);
}
public void paint(Graphics g) {
g.setColor(Color.RED);
g.fillOval(cX, cY, r * 2, r * 2);
}
private class MouseHandler extends MouseAdapter implements MouseMotionListener{
public void mousePressed(MouseEvent me)
{
a = me.getX();
b = me.getY();
if (Math.sqrt((cX - a) * (cX - a) + (cY - b) * (cY - b)) < r)
dX = me.getX() - x;
dY = me.getY() - y;
}
public void mouseDragged(MouseEvent me)
{
x = me.getX() - dX;
y=me.getY()-dY;
cX= x+r;
cY=y+r;
repaint();
}
public void mouseMoved(MouseEvent e) {
// nothing todo
}
}
public static void main(String[] args) {
Circle c1 = new Circle();
c1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
