import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.Transparency;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.Timer;
public
class
AnimationTest
extends
JPanel
implements
ActionListener {
private
static
final
int WIDE = 640;
private
static
final
int HIGH = 480;
private
static
final
int RADIUS = 25;
private
static
final
int FRAMES = 24;
private
final
Timer timer =
new
Timer(20, this);
private
final
Rectangle rect =
new
Rectangle();
private
BufferedImage background;
private
int index;
private
long totalTime;
private
long averageTime;
private
int frameCount;
public
static
void main(String[] args) {
EventQueue.invokeLater(
new
Runnable() {
@Override
public
void run() {
new
AnimationTest().create();
}
});
}
private
void create() {
JFrame f =
new
JFrame(
"AnimationTest"
);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
timer.start();
}
public
AnimationTest() {
super(true);
this.setOpaque(false);
this.setPreferredSize(
new
Dimension(WIDE, HIGH));
this.addMouseListener(
new
MouseHandler());
this.addComponentListener(
new
ComponentHandler());
}
@Override
protected
void paintComponent(Graphics g) {
long start = System.nanoTime();
super.paintComponent(g);
int w = this.getWidth();
int h = this.getHeight();
g.drawImage(background, 0, 0, this);
double theta = 2 * Math.PI * index++ / 64;
g.setColor(Color.blue);
rect.setRect(
(int) (Math.sin(theta) * w / 3 + w / 2 - RADIUS),
(int) (Math.
cos
(theta) * h / 3 + h / 2 - RADIUS),
2 * RADIUS, 2 * RADIUS);
g.fillOval(rect.x, rect.y, rect.width, rect.height);
g.setColor(Color.white);
if
(frameCount == FRAMES) {
averageTime = totalTime / FRAMES;
totalTime = 0; frameCount = 0;
}
else
{
totalTime += System.nanoTime() - start;
frameCount++;
}
String s = String.format(
"%1.3f"
, averageTime / 1000000d);
g.drawString(s, 5, 16);
}
@Override
public
void actionPerformed(ActionEvent e) {
this.repaint();
}
private
class
MouseHandler
extends
MouseAdapter {
@Override
public
void mousePressed(MouseEvent e) {
super.mousePressed(e);
JTextField field =
new
JTextField(
"test"
);
Dimension d = field.getPreferredSize();
field.setBounds(e.getX(), e.getY(), d.width, d.height);
add(field);
}
}
private
class
ComponentHandler
extends
ComponentAdapter {
private
final
GraphicsEnvironment ge =
GraphicsEnvironment.getLocalGraphicsEnvironment();
private
final
GraphicsConfiguration gc =
ge.getDefaultScreenDevice().getDefaultConfiguration();
private
final
Random r =
new
Random();
@Override
public
void componentResized(ComponentEvent e) {
super.componentResized(e);
int w = getWidth();
int h = getHeight();
background = gc.createCompatibleImage(w, h, Transparency.OPAQUE);
Graphics2D g = background.createGraphics();
g.clearRect(0, 0, w, h);
g.setColor(Color.green.darker());
for
(int i = 0; i < 128; i++) {
g.drawLine(w / 2, h / 2, r.nextInt(w), r.nextInt(h));
}
g.dispose();
System.out.println(
"Resized to "
+ w +
" x "
+ h);
}
}
}