2013-05-04 15:54:40Morris
[JAVA][作業] 點擊旋轉九十度
讀一個圖片檔，並且以點擊的方式，將圖片做旋轉九十度。
package ce1002.A5.s100502205;
import java.io.File;
import java.awt.Color;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.ImageIcon;
public class A51 extends JFrame {
private JButton btn;
private BufferedImage buffer;
public BufferedImage rotate90(BufferedImage source) {
int width, height;
width = source.getWidth();
height = source.getHeight();
BufferedImage out = new BufferedImage(height, width, source.getType());
for(int j = 0; j < height; j++)
for(int i = width-1; i >= 0; i--)
out.setRGB(j, width-i-1, buffer.getRGB(i, j));
return out;
}
public A51() {
this.setTitle("A51");
this.setSize(800, 800);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
try {
btn = new JButton();
buffer = ImageIO.read(new File("test2.jpg"));
} catch (Exception e) {
}
btn.setIcon(new ImageIcon(buffer));
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
buffer = rotate90(buffer);
btn.setIcon(new ImageIcon(buffer));
}
});
this.add(btn);
this.setVisible(true);
this.setResizable(false);
}
public static void main(String[] args) {
new A51();
}
}
這裡給一個使用 rotate 的 method 做法，
但是無法做出長方形的旋轉，目前還不太會調用。
package ce1002.A5.s100502205;
import java.io.File;
import java.awt.Color;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.ImageIcon;
public class A5 extends JFrame {
private JButton btn;
private BufferedImage buffer;
public BufferedImage rotate90(BufferedImage source) { // only width == height
int width, height;
width = source.getWidth();
height = source.getHeight();
BufferedImage out = new BufferedImage(height, width, source.getType());
Graphics2D g2d = out.createGraphics();
g2d.rotate(Math.toRadians(90), height/2, width/2);
g2d.drawImage(source, 0, 0, null);
return out;
}
public A5() {
this.setTitle("A5");
this.setSize(450, 350);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
try {
btn = new JButton();
buffer = ImageIO.read(new File("test.jpg"));
} catch (Exception e) {
}
btn.setIcon(new ImageIcon(buffer));
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
buffer = rotate90(buffer);
btn.setIcon(new ImageIcon(buffer));
}
});
this.add(btn);
this.setVisible(true);
this.setResizable(false);
}
public static void main(String[] args) {
new A5();
}
}
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