JAVA - Drag

 

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package dragb;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class DragB extends JApplet

{

    int mouseX, mouseY;

MyPane myPane;

public void init() 

{

myPane = new MyPane();

setContentPane(myPane);

myPane.setBackground(Color.white);

myPane.addMouseMotionListener(new CircleDragger());

    }

  

// Make your drawing widget by making a subcless of JPanel

// and override one method, paintComponent().

    public class MyPane extends JPanel

{

             // This inner class defines a drawing space

             // and does the drawing on the space.

public void paintComponent(Graphics g) 

{

// Draw the panel and mouse position

super.paintComponent(g);  // Fills the panel space with background color.

g.setColor(Color.blue);

int margin = 1;

g.drawRect(margin,margin, getSize().width-2*margin,getSize().height-2*margin);  

Graphics2D g2d = (Graphics2D) g;

int r =30;

GradientPaint gradient = new GradientPaint(mouseX-r/2,mouseY-r/2,Color.red,mouseX,mouseY,Color.orange);

g2d.setPaint(gradient);

    g.fillOval(mouseX-r/2,mouseY-r/2,r,r);

g.setColor(Color.black);

g.drawString("(" + mouseX + "," + mouseY + ")",

              mouseX, mouseY-r/2);

}  

} 

private class CircleDragger extends MouseMotionAdapter 

{

public void mouseDragged(MouseEvent e) { 

mouseX = e.getX();

mouseY = e.getY();

myPane.repaint();

    }

}

}