import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.MediaTracker;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
/*
* ZoomFrame.java
*
* Created on 14. April 2004, 18:43
*/
/**
*
* @author Thomas Darimont
*/
public class ZoomFrame extends JFrame {
//Unser "In-Memory Screen Buffer"
private BufferedImage screen;
//Der Ball ...
private BufferedImage shape;
//aktuelle X-Positionen der Maus im Panel ...
private int xPos;
private RenderingHints renderingHints;
private JPanel gfxPanel;
private final int MAX_IMAGE_SIZE_Y = 500;
private final int MIN_IMAGE_SIZE_Y = 100;
private final int MAX_IMAGE_SIZE_X = 500;
private final int MIN_IMAGE_SIZE_X = 100;
private final double SCALE_UP = 1.1d;
private final double SCALE_DOWN = 0.9d;
private int width = 100;
private int height = 100;
/** Creates new form ZoomFrame */
public ZoomFrame() {
initComponents();
screen = new BufferedImage(512, 384, BufferedImage.TYPE_INT_RGB);
loadImage();
//Hier kann man mit den Verschiedenen RenderingOptionen der Klasser
//RenderingHints herumspielen ...
renderingHints =
new RenderingHints(
RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
}
/**
* Hier wird das Bild von der Festpallte geladen.
* Durch den MediaTracker stellen wir sicher, dass das Bild
* nach verlassen dieser Methode vollständig geladen ist.
*
*/
private void loadImage() {
MediaTracker mt = new MediaTracker(this);
try {
shape = ImageIO.read(new File("c:/ball.gif"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mt.addImage(shape, 0);
try {
mt.waitForAll();
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
mt = null;
}
/**
* Ich überschriebe hier die paintComponent Methode von JPanel um das
* Bild anzeigen zu lassen ...
*/
private void initComponents() {
setSize(512, 384);
setResizable(false);
gfxPanel = new javax.swing.JPanel() {
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (screen != null)
g.drawImage(screen, 0, 0, this);
}
};
getContentPane().setLayout(new FlowLayout());
setTitle("ZoomFrame");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gfxPanel.setBackground(new Color(102, 153, 255));
gfxPanel.setMinimumSize(new Dimension(512, 384));
gfxPanel.setPreferredSize(new Dimension(512, 384));
gfxPanel.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseMoved(MouseEvent evt) {
jPanel1MouseMoved(evt);
}
});
getContentPane().add(gfxPanel);
pack();
}
private void jPanel1MouseMoved(MouseEvent evt) {
//Hat sich die Maus nach links oder rechts bewegt?
int dx = xPos - evt.getX();
//Nur wenn die Maus über 30 Pixel gewandert ist soll neu gezeichnet werden ...
if (Math.abs(dx) > 30) {
//System.out.println(width + " : " + dx);
xPos = evt.getX();
AffineTransform transform = null;
//Bilden des Transform Objektes für das Skalieren ...
if (dx > 0 && (width * SCALE_UP <= 500)) {
transform =
AffineTransform.getScaleInstance(SCALE_UP, SCALE_UP);
width *= SCALE_UP;
} else if (width * SCALE_DOWN >= 100) {
transform =
AffineTransform.getScaleInstance(SCALE_DOWN, SCALE_DOWN);
width *= SCALE_DOWN;
} else {
return;
}
//Anwenden des Transform Objektes ....
AffineTransformOp transformOp =
new AffineTransformOp(transform, renderingHints);
shape = transformOp.filter(shape, null);
draw();
//Um den Garbage Collector etwas zu unterstützen ;-)
transform = null;
transformOp = null;
}
}
/**
* Zeichnet das Bild in den In-Memory-Buffer und lässt diesen durch den Aufruf
* von updateUI() am JPanel durch dessen überschriebene paintComponentMethode
* aufs Panel malen.
*/
private void draw() {
if (screen != null) {
Graphics2D g2d = (Graphics2D) screen.getGraphics();
g2d.fillRect(0, 0, 512, 384);
if (shape != null) {
g2d.drawImage(shape, 50, 50, gfxPanel);
gfxPanel.updateUI();
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
new ZoomFrame().show();
}
}
