/*
* Copyright (c) 1995, 2008, 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.
*
* - Redistributions 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 or the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.image.*;
/*
* This applet allows the user to move a texture painted rectangle around the applet
* window. The rectangle flickers and draws slowly because this applet does not use
* double buffering.
*/
public class ShapeMover extends Applet {
static protected Label label;
public void init() {
setLayout(new BorderLayout());
add(new SMCanvas());
label = new Label("Drag rectangle around within the area");
add("South", label);
}
public static void main(String s[]) {
Frame f = new Frame("ShapeMover");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Applet applet = new ShapeMover();
f.add("Center", applet);
applet.init();
f.pack();
f.setSize(new Dimension(550, 250));
f.setVisible(true);
}
}
class SMCanvas 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 SMCanvas() {
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 the mouse.
if (rect.contains(e.getX(), e.getY())) {
pressOut = false;
updateLocation(e);
} else {
ShapeMover.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 {
ShapeMover.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())) {
if (!pressOut) {
updateLocation(e);
}
} else {
ShapeMover.label.setText("First position the cursor on the rectangle "
+ "and then drag.");
}
}
// 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) {
}
// Updates the coordinates representing the location of the current rectangle.
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()) {
ShapeMover.label.setText("Rectangle located at "
+ rect.getX() + ", "
+ rect.getY());
} else {
ShapeMover.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;
Dimension dim = getSize();
int w = (int) dim.getWidth();
int h = (int) dim.getHeight();
g2.setStroke(new BasicStroke(8.0f));
if (firstTime) {
area = new Rectangle(dim);
rect.setLocation(w / 2 - 50, h / 2 - 25);
firstTime = false;
}
// Clears the rectangle that was previously drawn.
g2.setPaint(Color.white);
g2.fillRect(0, 0, w, h);
// Draws and fills the newly positioned rectangle.
g2.setPaint(strokePolka);
g2.draw(rect);
g2.setPaint(fillPolka);
g2.fill(rect);
}
/*
* 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.getWidth()) {
new_x = (int) area.getWidth() - 99;
}
if (rect.x < 0) {
new_x = -1;
}
if ((rect.y + 50) > area.getHeight()) {
new_y = (int) area.getHeight() - 49;
}
if (rect.y < 0) {
new_y = -1;
}
rect.setLocation(new_x, new_y);
return false;
}
}