/*
* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* -Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Oracle nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
* DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
* RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE SOFTWARE OR
* ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
* FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,
* SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
* THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that Software is not designed, licensed or
* intended for use in the design, construction, operation or
* maintenance of any nuclear facility.
*/
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.image.*;
public class BufferedShapeMover extends Applet{
static protected Label label;
public void init(){
//Initialize the layout.
setLayout(new BorderLayout());
add(new BSMCanvas());
label = new Label("Drag rectangle around within the area");
add("South", label);
}
public static void main(String s[]) {
Frame f = new Frame("BufferedShapeMover");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
Applet applet = new BufferedShapeMover();
f.add("Center", applet);
applet.init();
f.pack();
f.setSize(new Dimension(550,250));
f.show();
}
}
class BSMCanvas extends Canvas implements MouseListener, MouseMotionListener{
Rectangle rect = new Rectangle(0, 0, 100, 50);
BufferedImage bi;
Graphics2D big;
// Holds the coordinates of the user's last mousePressed event.
int last_x, last_y;
boolean firstTime = true;
TexturePaint fillPolka, strokePolka;
Rectangle area;
// True if the user pressed, dragged or released the mouse outside of the rectangle; false otherwise.
boolean pressOut = false;
public BSMCanvas(){
setBackground(Color.white);
addMouseMotionListener(this);
addMouseListener(this);
// Creates the fill texture paint pattern.
bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB);
big = bi.createGraphics();
big.setColor(Color.pink);
big.fillRect(0, 0, 7, 7);
big.setColor(Color.cyan);
big.fillOval(0, 0, 3, 3);
Rectangle r = new Rectangle(0,0,5,5);
fillPolka = new TexturePaint(bi, r);
big.dispose();
//Creates the stroke texture paint pattern.
bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB);
big = bi.createGraphics();
big.setColor(Color.cyan);
big.fillRect(0, 0, 7, 7);
big.setColor(Color.pink);
big.fillOval(0, 0, 3, 3);
r = new Rectangle(0,0,5,5);
strokePolka = new TexturePaint(bi, r);
big.dispose();
}
// Handles the event of the user pressing down the mouse button.
public void mousePressed(MouseEvent e){
last_x = rect.x - e.getX();
last_y = rect.y - e.getY();
// Checks whether or not the cursor is inside of the rectangle while the user is pressing themouse.
if(rect.contains(e.getX(), e.getY())){
updateLocation(e);
} else {
BufferedShapeMover.label.setText("First position the cursor on the rectangle and then drag.");
pressOut = true;
}
}
// Handles the event of a user dragging the mouse while holding down the mouse button.
public void mouseDragged(MouseEvent e){
if(!pressOut){
updateLocation(e);
} else {
BufferedShapeMover.label.setText("First position the cursor on the rectangle and then drag.");
}
}
// Handles the event of a user releasing the mouse button.
public void mouseReleased(MouseEvent e){
// Checks whether or not the cursor is inside of the rectangle when the user releases the
// mouse button.
if(rect.contains(e.getX(), e.getY())){
updateLocation(e);
} else {
BufferedShapeMover.label.setText("First position the cursor on the rectangle and then drag.");
pressOut = false;
}
}
// This method required by MouseListener.
public void mouseMoved(MouseEvent e){}
// These methods are required by MouseMotionListener.
public void mouseClicked(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void updateLocation(MouseEvent e){
rect.setLocation(last_x + e.getX(), last_y + e.getY());
/*
* Updates the label to reflect the location of the
* current rectangle
* if checkRect returns true; otherwise, returns error message.
*/
if (checkRect()) {
BufferedShapeMover.label.setText("Rectangle located at " +
rect.getX() + ", " +
rect.getY());
} else {
BufferedShapeMover.label.setText("Please don't try to "+
" drag outside the area.");
}
repaint();
}
public void paint(Graphics g){
update(g);
}
public void update(Graphics g){
Graphics2D g2 = (Graphics2D)g;
if(firstTime){
Dimension dim = getSize();
int w = dim.width;
int h = dim.height;
area = new Rectangle(dim);
bi = (BufferedImage)createImage(w, h);
big = bi.createGraphics();
rect.setLocation(w/2-50, h/2-25);
big.setStroke(new BasicStroke(8.0f));
firstTime = false;
}
// Clears the rectangle that was previously drawn.
big.setColor(Color.white);
big.clearRect(0, 0, area.width, area.height);
// Draws and fills the newly positioned rectangle to the buffer.
big.setPaint(strokePolka);
big.draw(rect);
big.setPaint(fillPolka);
big.fill(rect);
// Draws the buffered image to the screen.
g2.drawImage(bi, 0, 0, this);
}
/*
* Checks if the rectangle is contained within the applet window. If the rectangle
* is not contained withing the applet window, it is redrawn so that it is adjacent
* to the edge of the window and just inside the window.
*/
boolean checkRect(){
if (area == null) {
return false;
}
if(area.contains(rect.x, rect.y, 100, 50)){
return true;
}
int new_x = rect.x;
int new_y = rect.y;
if((rect.x+100)>area.width){
new_x = area.width-99;
}
if(rect.x < 0){
new_x = -1;
}
if((rect.y+50)>area.height){
new_y = area.height-49;
}
if(rect.y < 0){
new_y = -1;
}
rect.setLocation(new_x, new_y);
return false;
}
}