import java.awt.BasicStroke;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
public class JFrameRotate extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrameRotate frame = new JFrameRotate();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
int panelWidth=600, panelHeight=600;
/**
* Create the frame.
*/
public JFrameRotate() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(0, 0, panelWidth, panelHeight);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
loadCard();
}
// JFrame: public void paint(Graphics g)
// JPanel: protected void paintComponent(Graphics g)
@Override
public void paint(Graphics g) {
if (bImg!=null) {
//g.drawImage(bImg, xCenter, yCenter, this);
// draw the image
Graphics2D g2d = (Graphics2D) g;
g2d.drawImage(bImg, rotate(10), contentPane);
g2d.drawImage(bImg, rotate(45), contentPane);
g2d.drawImage(bImg, rotate(90), contentPane);
g2d.drawImage(bImg, rotate90(), contentPane);
}
}
int strokeImg =1, widthImg=100, heightImg=150;
int xCenter=200, yCenter=300;
BufferedImage bImg;
private void loadCard() {
bImg = new BufferedImage(widthImg,
heightImg, BufferedImage.TYPE_INT_BGR);
Graphics2D g2d = bImg.createGraphics();
g2d.setStroke(new BasicStroke(1)); // 1 pixel
// https://stackoverflow.com/questions/31152233/opening-image-asset-java-jdk-8
String sFName = "/images/KC.png"; // See here to setup image resources
BufferedImage img;
try {
img = ImageIO.read(getClass().getResource(sFName));
g2d.drawImage(img, strokeImg, strokeImg, widthImg-(2*strokeImg),
heightImg-(2*strokeImg), this);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private AffineTransform rotate(int degree) {
double rotationAngle=degree*Math.PI/180;
AffineTransform transform = new AffineTransform();
transform.rotate(rotationAngle, xCenter, yCenter);
//transform.rotate(rotationAngle);
transform.translate(xCenter, yCenter);
return transform;
}
/*
* 90 degree only, keep on position top left
*/
private AffineTransform rotate90() {
double rotationAngle=90*Math.PI/180;
AffineTransform transform = new AffineTransform();
transform.rotate(rotationAngle, xCenter, yCenter);
// yCenter-heightImg = horizontal position
// xCenter: vertical position
transform.translate(xCenter, yCenter-heightImg);
return transform;
}
}
