旋转Java中的缓冲图像 [英] Rotate a buffered image in Java
问题描述
我正在尝试旋转Java中的缓冲图像.这是我正在使用的代码:
I am trying to rotate a buffered image in java. Here is the code I am using:
public static BufferedImage rotate(BufferedImage bimg, double angle){
int w = bimg.getWidth();
int h = bimg.getHeight();
Graphics2D graphic = bimg.createGraphics();
graphic.rotate(Math.toRadians(angle), w/2, h/2);
graphic.drawImage(bimg, null, 0, 0);
graphic.dispose();
return bimg;
}
我已经看过许多关于此主题的堆栈溢出问题和答案，但无法弄清为什么在尝试旋转图像时会像原来那样被切碎.这是显示加载的图像的示例: 已加载图像
I have looked a numerous stack overflow questions and answers on this topic and not been able to figure out why the image is chopped up the way it is when I try to rotate it. Here is an example showing a loaded image: loaded image
单击旋转按钮后，将使用缓冲的图像和角度90.0调用上述函数: 切碎的图像
After I click the rotate button which calls the above function with the buffered image and a 90.0 for the angle: chopped up image
有人可以帮助我了解发生了什么以及如何解决吗?
Can someone help me understand what is happening and how to fix it?
谢谢！
推荐答案
与往常一样，Internet可以进行救援.因此，这是我从其他资源/帖子/博客中获取的一些代码，它们将返回一个新图像，该图像的大小将包含旋转后的图像
As always, the Internet to the rescue. So, this is some code which I hobbled together from other resources/post/blogs which will return a new image which is sized so it will contain the rotated image
public BufferedImage rotateImageByDegrees(BufferedImage img, double angle) {
double rads = Math.toRadians(angle);
double sin = Math.abs(Math.sin(rads)), cos = Math.abs(Math.cos(rads));
int w = img.getWidth();
int h = img.getHeight();
int newWidth = (int) Math.floor(w * cos + h * sin);
int newHeight = (int) Math.floor(h * cos + w * sin);
BufferedImage rotated = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = rotated.createGraphics();
AffineTransform at = new AffineTransform();
at.translate((newWidth - w) / 2, (newHeight - h) / 2);
int x = w / 2;
int y = h / 2;
at.rotate(rads, x, y);
g2d.setTransform(at);
g2d.drawImage(img, 0, 0, this);
g2d.setColor(Color.RED);
g2d.drawRect(0, 0, newWidth - 1, newHeight - 1);
g2d.dispose();
return rotated;
}
已更新
因此，使用此PNG:
还有此代码...
package javaapplication1.pkg040;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;
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;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage master;
private BufferedImage rotated;
public TestPane() {
try {
master = ImageIO.read(new File("/Volumes/Disk02/Dropbox/MegaTokyo/Miho_Small.png"));
rotated = rotateImageByDegrees(master, 0.0);
} catch (IOException ex) {
ex.printStackTrace();
}
Timer timer = new Timer(40, new ActionListener() {
private double angle = 0;
private double delta = 1.0;
@Override
public void actionPerformed(ActionEvent e) {
angle += delta;
rotated = rotateImageByDegrees(master, angle);
repaint();
}
});
timer.start();
}
@Override
public Dimension getPreferredSize() {
return master == null
? new Dimension(200, 200)
: new Dimension(master.getWidth(), master.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (rotated != null) {
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - rotated.getWidth()) / 2;
int y = (getHeight() - rotated.getHeight()) / 2;
g2d.drawImage(rotated, x, y, this);
g2d.dispose();
}
}
public BufferedImage rotateImageByDegrees(BufferedImage img, double angle) {
double rads = Math.toRadians(angle);
double sin = Math.abs(Math.sin(rads)), cos = Math.abs(Math.cos(rads));
int w = img.getWidth();
int h = img.getHeight();
int newWidth = (int) Math.floor(w * cos + h * sin);
int newHeight = (int) Math.floor(h * cos + w * sin);
BufferedImage rotated = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = rotated.createGraphics();
AffineTransform at = new AffineTransform();
at.translate((newWidth - w) / 2, (newHeight - h) / 2);
int x = w / 2;
int y = h / 2;
at.rotate(rads, x, y);
g2d.setTransform(at);
g2d.drawImage(img, 0, 0, this);
g2d.dispose();
return rotated;
}
}
}
我可以生成类似...
I can generate something like...
这篇关于旋转Java中的缓冲图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
