how to rotate a figure in java

[hawx]

hi all, they look at is that I'm trying to simulate a tangram and so far I've gotten difrentes transladar the figures but I failed to rotate, if anyone can help me review the program and is helping me to rotate the agrdeceria because I have not achieved

thanks

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Panel;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.Border;
import javax.swing.border.TitledBorder;

public class Figura extends JPanel {

private Polygon[] polygons = {};
private Polygon selected = null;
private Point last = null;
private float rot;

public Figura() {

rot = (float)Math.PI/2;
polygons = new Polygon[3];
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
onMouseDown(e);
Graphics2D g = (Graphics2D)getGraphics();
int x = e.getX(); // x-coordinate where user clicked.
int y = e.getY();
if(e.isMetaDown()){
polygons[0].contains(x, y);
g.rotate(5);
//g.setColor(Color.blue);
//g.fillOval( x - 25, y - 15, 60, 30 );
//g.setColor(Color.black);
//g.drawOval( x - 25, y - 15, 60, 30 );

}
}
public void mouseReleased(MouseEvent e) {
onMouseUp(e);
}
});
addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
onMouseDragged(e);
}
});
}

protected void onMouseDown(MouseEvent e) {
last = e.getPoint();
for (int i = 0; i < polygons.length; i++) {
if (polygons[i].contains(last)) {
selected = polygons[i];
return;
}
}
selected = null;
}

protected void onMouseDragged(MouseEvent e) {
Point now = e.getPoint();
if (last != null) {
int xtrans = now.x - last.x;
int ytrans = now.y - last.y;
if (selected != null) {
selected.translate(xtrans, ytrans);
repaint();
}
last = now;
}
}

protected void onMouseUp(MouseEvent e) {
last = null;
selected = null;
repaint();
}

protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.blue);

for (int i = 0; i < polygons.length; i++) {
g2.drawPolygon(polygons[i]);
//g2.rotate(rot, this.getWidth()/2, this.getHeight()/2);
}
}

public Polygon[] getPolygons() {
return polygons;
}

public void setPolygons(Polygon[] polygons) {
this.polygons = polygons;
}


public void triangulo(){
int xVals[] = { 108, 80,135};
int yVals[] = { 340, 380, 380 };
//Polygon[] polys = new Polygon[1];
//for (int i = 0; i < polygons.length; i++) {
polygons[0] = new Polygon(xVals, yVals, 3);

//}

}

public void cuadrado(){
int polx[] = {208, 208,258,258,258};
int poly[] = {340, 390, 340, 390,390};
//Polygon[] polys = new Polygon[1];
// for (int i = 0; i < polygons.length; i++) {
polygons[1] = new Polygon(polx, poly, 4);
// }

}


public void paralelogramo(){

int polx[]={330, 380 , 480, 430};
int poly[]={100, 280, 280 ,330};
polygons[2]= new Polygon(polx, poly, 4);
}



public static void main(String[] args) {
Figura panel = new Figura();

panel.triangulo();
panel.cuadrado();
panel.paralelogramo();
panel.setPolygons(panel.polygons);


JPanel panelImagenes = new JPanel();
TitledBorder border = BorderFactory.createTitledBorder( "Resultados" );
panelImagenes.setLayout(new BorderLayout());
panel.add(panelImagenes);

JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
frame.setSize(800, 500);
frame.setContentPane(panel);
frame.show();
}

}

[DarrylBurke]

Check out AffineTransform and its method createTransformedShape

db

[benivolentsoft]

The next example will rotate a picture 5 degrees at a time. We are using the Java2D package (and Swing).

--------------------
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;

public class RotatePanel extends JPanel {
private Image image;
private double currentAngle;

public RotatePanel(Image image) {
this.image = image;
MediaTracker mt = new MediaTracker(this);
mt.addImage(image, 0);
try {
mt.waitForID(0);
}
catch (Exception e) {
e.printStackTrace();
}
}

public void rotate() {
//rotate 5 degrees at a time
currentAngle+=5.0;
if (currentAngle >= 360.0) {
currentAngle = 0;
}
repaint();
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
AffineTransform origXform = g2d.getTransform();
AffineTransform newXform = (AffineTransform)(origXform.clone());
//center of rotation is center of the panel
int xRot = this.getWidth()/2;
int yRot = this.getHeight()/2;
newXform.rotate(Math.toRadians(currentAngle), xRot, yRot);
g2d.setTransform(newXform);
//draw image centered in panel
int x = (getWidth() - image.getWidth(this))/2;
int y = (getHeight() - image.getHeight(this))/2;
g2d.drawImage(image, x, y, this);
g2d.setTransform(origXform);
}

public Dimension getPreferredSize() {
return new Dimension (image.getWidth(this), image.getHeight(this));
}


public static void main(String[] args) {
JFrame f = new JFrame();
Container cp = f.getContentPane();
cp.setLayout(new BorderLayout());
Image testImage =
Toolkit.getDefaultToolkit().getImage("c:/temp/gumby.gif");
final RotatePanel rotatePanel = new RotatePanel(testImage);
JButton b = new JButton ("Rotate");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
rotatePanel.rotate();
}
});
cp.add(rotatePanel, BorderLayout.CENTER);
cp.add(b, BorderLayout.SOUTH);
f.pack();
f.setVisible(true);
}
}
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