Yes, it makes sense. This code is available on the web, it doesn't make 100% sense to me right now (haven't looked that hard really), but it does what you're looking for. It seems to just use the drawLine method to continuously draw lines where the mouse is positioned and give the appearance of a dragged rectangle. Wouldn't normally give you code but I believe you that this isn't an assignment so...
// Rubber.java basic rubber band
// Draw rectangle. left mouse down=first point
// Drag to second point. left mouse up=final point
import java.awt.*;
import java.awt.event.*;
public class Rubber extends Frame
{
int winWidth = 500;
int winHeight = 500;
boolean tracking = false; // left button down, sense motion
int startX = 0;
int startY = 0;
int currentX = 0;
int currentY = 0;
Rubber()
{
setTitle("Rubber");
setSize(winWidth,winHeight);
setBackground(Color.white);
setForeground(Color.black);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
setVisible(true);
this.addMouseListener (new mousePressHandler());
this.addMouseListener (new mouseReleaseHandler());
this.addMouseMotionListener (new mouseMotionHandler());
}
void mouseMotion(int x, int y)
{
if(tracking)
{
currentX = x;
currentY = y;
}
requestFocus();
repaint();
}
void startMotion(int x, int y)
{
tracking = true;
startX = x;
startY = y;
currentX = x+4;
currentY = y+4; // nonzero size, may choose to ignore later
requestFocus();
repaint();
}
void stopMotion(int x, int y)
{
tracking = false; // no more rubber_rect
// save final figure data for 'display' to draw
currentX = x;
currentY = y;
requestFocus();
repaint();
}
class mousePressHandler extends MouseAdapter
{
public void mousePressed (MouseEvent e)
{
int b, x, y;
b = e.getButton();
x = e.getX();
y = e.getY();
System.out.println("press x="+x+" y="+y+" b="+b); // debug print
if(b==1) startMotion(x, y);
}
}
class mouseReleaseHandler extends MouseAdapter
{
public void mouseReleased (MouseEvent e)
{
int b, x, y;
b = e.getButton();
x = e.getX();
y = e.getY();
System.out.println("release x="+x+" y="+y+" b="+b); // debug print
if(b==1) stopMotion(x, y);
}
}
class mouseMotionHandler extends MouseMotionAdapter
{
public void mouseDragged (MouseEvent e)
{
int b, x, y;
b = e.getButton();
x = e.getX();
y = e.getY();
System.out.println("motion x="+x+" y="+y+" b="+b); // debug print
mouseMotion(x, y);
}
}
void rubberRect(Graphics g, int x0, int y0, int x1 , int y1)
{
// can apply to all figures
// draw a rubber rectangle, mouse down, tracks mouse
int x,y,x2,y2,x3,y3; // local coordinates
x2=x0;
x3=x1;
if(x1<x0) {x2=x1; x3=x0;};
y2=y0;
y3=y1;
if(y1<y0) {y2=y1; y3=y0;};
g.setColor(Color.black);
for(x=x2; x<x3-3; x=x+8)
{
g.drawLine(x, y0, x+4, y0);
g.drawLine(x, y1, x+4, y1);
}
for(y=y2; y<y3-3; y=y+8)
{
g.drawLine(x0, y, x0, y+4);
g.drawLine(x1, y, x1, y+4);
}
}
public void paint(Graphics g)
{
if(tracking) rubberRect(g, startX, startY, currentX, currentY);
// may draw more
}
public static void main(String args[])
{
new Rubber();
}
}
